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Although it may not be obvious, we actually implemented a simple serial to Ethernet converter in the last section When TiniTerm is run, it takes console input Systemin, which was most likely receiving data typed from a Telnet session The characters typed at the Telnet prompt ultimately wind up as network data traveling over a TCP connection In this section we ll do a more formal job of making a bridge between a serial device and another host on an Ethernet network The big difference is that the example presented in this section, SerialToEthernet, is designed for communication with serial devices that transfer potentially large amounts of information with very little delay between characters This is as opposed to TiniTerm that only needed to perform well enough to keep up with a human typist The main difference is the need to move large buffers, in the form of byte arrays, in single, relatively few I/O operations The need for fast, full-duplex I/O over both the serial and network connections will lead to an application with a different structure that con gures and uses the serial port in a much different fashion than TiniTerm The SerialToEthernet application reads data from an attached serial device and writes it to a network server Data received from the same network server is transmitted to the serial device Potentially network and serial data are traveling in both directions simultaneously, as shown in Figure 34

Userfind_by_id(session[:remember_token])

SerialToEthernet s main method extracts the network server name, server port, and serial port data rate from the command line and passes them to the constructor (shown in Listing 36) The constructor opens serial0 and con gures the port for operation at 8 data bits, 1 stop bit, and no parity The baud rate is set to the speed passed to the constructor Since both serial and network I/O are potentially full duplex, the serial port ow control mode is set for RTS/CTS ow control This will protect the serial receive buffers of both TINI and the attached device from over ow under a potentially heavy load Next, the constructor acquires an InputStream and an OutputStream for reading from and writing to the serial port

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to retrieve the user Because of the way Rails handles sessions, this process is secure; if a malicious user tries to spoof the user id, Rails will detect a mismatch based on a special session id generated for each session For our application s design choice, which involves persistent sessions---that is, signin status that lasts even after browser close---storing the user id is a security hole As soon as we break the tie between the special session id and the stored user id, a malicious user could sign in as that user with a remember_token equal to the user s id To fix this flaw, we generate a unique, secure remember token for each user based on the user s salt and id Moreover, a permanent remember token would also represent a security hole---by inspecting the browser cookies, a malicious user could find the token and then use it to sign in from any other computer, any time We solve this by adding a timestamp to the token, and reset the token every time the user signs into the application This results in a persistent session essentially impervious to attack

Avoid groupthink Groupthink is the tendency for a group of people to sit around a table and nod their heads when they're really thinking "that will never work, but everyone else is nodding his head, so I must be wrong" You can single out people to respond to your questions as a tactic for avoiding groupthink: "Bob, you seem unsure of that, do you have an opinion to the contrary " Even if Bob doesn't have a contrary opinion, you've indicated that it's okay to have a contrary opinion

Now we re ready for the first signin element, the sign_in function itself Our authentication method is to place a remember token as a cookie on the user s browser (Box 92), and then use the token to find the user record in the database as the user moves from page to page (implemented in Section 933) The result, Listing 912, pushes two things onto the stack: the cookies hash and current_user6 Let s start popping them off

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