While tracking down test errors while installing Apache 2.0.53 and mod_perl2.0.0-RC4 into a jail process on a FreeBSD 5.3 server, we have encountered some errors with how the ip is being resolved for the loopback device.
Using test code from the Apache project[1], we were able to determine that a client socket created with an unspecified sin_addr (which defaults to 0.0.0.0) is not able to resolve to the loopback device.
If you patch the original nonblock.c with the lines listed below, the script will work and it will be apparent that the listener socket is able to resolve the 0.0.0.0 address to the real ip whereas the client is not.
How does address 0.0.0.0 work inside of a jail? The code nonblock.c starts up a listener on that address, which works, and then tries to connect to it and it fails.
Thanks, William McKee and Chad Leigh
[1] http://www.apache.org/~jorton/nonblock.c
65a66
printf("listening to %s:%d\n", inet_ntoa(sa.sin_addr), listen_port);76a78
sa.sin_addr.s_addr = inet_addr ("127.0.0.1");
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