Change in IP address selection algorithm (the pj_gethostip() function)

[bennylp]

Currently the pj_gethostip() function gets the IP address from the following algorithm:

1. get the IP of the hostname
2. if IP is not usable, get the default interface
3. if failed, get the first interface
4. if failed, return loopback address

Note: failed or not-usable means the query failed or the returned IP address is loopback IP or other non-usable IP.

One of the problem with above approach is sometimes a "good" IP address is returned from the step 1, but the IP is not usable (for example, the interface is down).

A better solution perhaps is to list all the addresses above, give them some weight, and return the one with the "best" value.

[bennylp]

Done in r2656:

• use the weighting mechanism to select the "best" IP to return