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Java Forum / General / September 2003java sockets problem
When I create a socket such as Socket sock = new Socket(address, port) and I pass some garbage value to address field like (123334) or something like that, the client just hangs up and does not throw any exceptions or anything. The funny thing is, when the address field is composed of characters, say I have "123.45.6.adasd" as the address then java does throw an exception, but if I only have numbers, it does not. What is going on? P.S. This only happens when I compile and run on UNIX. In windows it works fine, it timesout and throws an exception with both characters and numbers. I am using sdk 1.4.1 > When I create a socket such as Socket sock = new Socket(address, port) > and I pass some garbage value to address field like (123334) or [quoted text clipped - 3 lines] > then java does throw an exception, but if I only have numbers, it does > not. What is going on? The binary address 123334 is not garbage. It's perfectly legal to use the "computed" IP number instead of the byte-separated version people usually use. For instance, the IP address called 10.0.0.1 is really (10 * 1<<24) + (0 * 1<<16) + (0 * 1<<8) + 1 = 167772161 However, IPv4 addresses are only 32 bits (4 * 8) so any value larger than 4294967295 should give an error. Java should try and resolve any legal address you pass to the Socket constructor. >> When I create a socket such as Socket sock = new Socket(address, port) >> and I pass some garbage value to address field like (123334) or [quoted text clipped - 17 lines] > Java should try and resolve any legal address you pass to the Socket > constructor. Hmm. I didn't know that. So I guess that the reason it doesn't throw an exception in unix is that the timeout for a tcp connection attempt is rather longer than in windows, and you're not waiting long enough (several minutes). Steve Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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