The PPP API Classes in Java

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The PPP API Classes
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to this node as the authenticating peer In the next chapter we ll implement a PPP daemon that acts strictly as an authenticating peer However, the PPP API is suf ciently exible to allow for the creation of a general purpose PPP daemon Before the connection can support IP traf c, the IP addresses of both peers must be established Both the local and remote peer IP addresses can be set using the following methods
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public void setLocalAddress(byte[] address) public void setRemoteAddress(byte[] address)
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Both methods require a byte array containing the IP address in big-endian byte ordering If a remote address is speci ed, it will be vended to the remote peer during address negotiation If a remote address is speci ed, the local address must also be speci ed, and both addresses should be on the same network If the local address is set and the remote peer attempts to vend a different address, a STOPPED event will be generated and the negotiation of the PPP connection halts If the local application is connecting to a dial-up server, it is not required to set either the local or remote address In this case, it is expected that the remote peer will vend the local IP address After creating a PPP object, an application will typically set a new value for the asynchronous control character map (ACCM) used by the native PPP implementation
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public void setACCM(int newACCM)
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The setACCM method takes an integer that contains a bit map of the characters to be escaped If a bit in a speci ed position is 1, the corresponding character is escaped; otherwise, it is transmitted normally For example, an ACCM value of 0x80000001 would escape only characters 0 and 31 By default, during link negotiation PPP instructs the remote peer to escape all characters between 0 and 0x1f in other words, the default ACCM of 0xffffffff Since you ll most often be working with physical links capable of receiving arbitrary binary data, the ACCM should be set to 0 This will allow for more ef cient data transfer because it will avoid the unnecessary transmission of escape characters One important exception to this occurs when the use of software ow control (often referred to as XON/ XOFF ow control) is speci ed with the underlying serial port In this case, the software ow control characters XON (17 decimal) and XOFF (19 decimal) must be escaped This yields an ACCM of 0xa0000 If XON/XOFF ow control is to be used, the setXonXoffEscape method must also be invoked
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public void setXonXoffEscape(boolean value)
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When invoked with a value of true, the setXonXoffEscape method noti es the local PPP interface to escape the XON/XOFF characters
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Another option that an application may want to con gure before attempting to establish PPP connections is passive mode Passive mode can be enabled or disabled using the setPassive method
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public void setPassive(boolean value)
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The passive mode option affects the earliest phase in connection establishment: Line Control Protocol (LCP) negotiation The native LCP module attempts to initiate a connection by sending a con guration request message It will wait for a certain amount of time for the remote peer to acknowledge receipt of the message If no acknowledgment is received, LCP will time out and send the con guration request message again The retry count is nite, however, which means if no remote peer is actually receiving the message, PPP will time out and generate a STOPPED event Passive mode disables this time-out LCP will just wait indefinitely for a remote peer to transmit its own con guration request message Passive mode should not be enabled when modems are being used to establish the physical data link In this case, LCP negotiation doesn t begin until the modem connection has been established The time-out is required to notify the application that the remote peer is not responding However, in a con guration where a raw serial port is being used in an environment where devices come and go handheld computers such as a Palm Pilot, for example the application has no way of knowing when a device will be attached to the serial port In this case, the use of passive mode frees the application from having to process STOPPED events and restart PPP When a device eventually attaches to the port, it will transmit a con guration request message, the local LCP module will acknowledge the message, send its own con guration request, and the rest of the connection negotiation will continue in the normal fashion After using these methods to con gure the PPP session to meet its requirements, the application invokes the open method
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public void open()
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