[olsr-dev] some Qs about exending the dyn_gw plugin

[Jens Nachtigall]

Dear all,

I would like to extend the dyn_gw plugin in the following way:

By default it works as now (i.e. no ping).
If in the config file any IP address(es) is/are given, these will be 
pinged before adding the detected 0.0.0.0/0 to the HNA4 set in order to 
validate the internet connection.
Non-Internet-GW/nets are not considered. If one wants to include these, 
one has to explicitly add them on the command-line or in the config, as 
it is done without the plugin. This is because, adding support for 
automatically detecting non-internet-nets leads to further problems, 
e.g. the question if it is NAT'ed or not. Also, the inclusion of 
non-internet-gw, which are actually not pingable/reachable is not a 
problem for others, as is the announcement of internet-gw as HNA4)

@sven-ola: Do you agree with this scheme? I am asking, because I am 
primarily doing this because I hope it will be useful for the freifunk 
firmware.)

My questions are now:

1st 
I've seen the new config file scheme:
LoadPlugin "olsrd_dyn_gw.so.0.1"
{
    PlParam     "key4"   "value3"
    # Might be possible to set options here in
    # future versions
}
This would mean one IP per line, right? e.g.

LoadPlugin "olsrd_dyn_gw.so.0.1"
{
    PlParam     "IP_1"   "141.1.1.1"
    PlParam     "IP_2"   "141.6.6.6"
    # Might be possible to set options here in
    # future versions
}
and not 
LoadPlugin "olsrd_dyn_gw.so.0.1"
{
    PlParam     "IPs"   "141.1.1.1"  "141.6.6.6"
    # Might be possible to set options here in
    # future versions
}
???


2nd
How can these values in the config be accessed, without rereading the 
config files? (I could not find an obvious enough name in 
olsr_plugin_io.h)


3rd
Currently I use system(2) [e.g. system("ping -c 1 -q IP")] to do the 
ping, which is suboptimal since the ping would be done with olsrd's 
prevelidges (i.e. root) and afaics it also blocks olsrd while the ping 
the going on. Anybody knowing a better approach or syscall, 
respectively?


Best,
Jens
 
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