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10 lines
550 B
Text
10 lines
550 B
Text
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This is a simple program which demonstrates how to query the kernel
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routing mechanism using only a UDP socket. Pass it a hostname on
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the command line (sorry, it doesn't parse dotted decimal) and it will
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print out an IP address which names the interface over which UDP
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packets intended for that destination would be sent.
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A more sophisticated program might use the list obtained from SIOCGIFCONF
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to match the address with an interface name, but applications programmers
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much more often need to know the address of the interface rather than
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the name.
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