#!/usr/bin/perl

# xCAT postscript for configuring bonding of nics.
#  Usage:  configbond bond1 eth1 [eth3]
#
# Note: this postscript currently has some assumptions that are specific to the softlayer environment.
#       We only use this to configure bond1, because bond0 gets configured by the node provisioning process.
#       (altho this script would work for bond0)

use strict;
# Check number of args

my $nargs = $#ARGV + 1;
if (scalar(@ARGV) < 2 || scalar(@ARGV) > 3) {
   system("logger -t xcat -p local4.err  'Usage: configbond <bond> <dev0> [<dev1>]'");
   exit 1;
}

my $bond = shift(@ARGV);
my $nic = $ARGV[0];  
my @devs;
foreach my $a (@ARGV) { push(@devs,split('@',$a)); }    # support the new syntax in the xcat configbond postscript
my $nicips = $ENV{NICIPS};
my $nicnetworks = $ENV{NICNETWORKS};
my $net_cnt = $ENV{NETWORKS_LINES};

#todo: change this script so they dont need to specify nicnetworks
if (!$nicips || !$nicnetworks) { system("logger -t xcat -p local4.err 'configbond: must specify attributes nicips and nicnetworks in the xcat db for this node.'"); exit 1; }

#todo: these are specific to softlayer.  They should be another attribute or argument
my $bondingopts = 'mode=4 miimon=100 downdelay=0 updelay=0 lacp_rate=fast xmit_hash_policy=1';

my $netmask ='';
my $ipaddr = '';
my $nic_num = '';
my $subnet = '';
my $nic_net = '';
my $net_name = '';
my @nic_nets = (); # array of networks for this nic
my @nic_ips =();   # array of ipaddresses for this nic
my @networks = (); # array of all networks from networks table.
                   # { network_name, subnet, netmask }

system("logger -t xcat -p local4.err  'configbond: Master: $bond'");
system("logger -t xcat -p local4.err  'configbond: Slaves: @devs'");
#system("logger -t xcat -p local4.err  'configbond: NIC:           $nic'");
system("logger -t xcat -p local4.err  'configbond: NICNETWORKS:   $nicnetworks'");
system("logger -t xcat -p local4.err  'configbond: NICIPS:        $nicips'");

# Update modprobe
my $file = "/etc/modprobe.d/$bond.conf";
if (!open(FILE, ">$file")) { system("logger -t xcat -p local4.err 'configbond: cannot open $file.'"); exit 1; }

print FILE "alias $bond bonding\n";
# the bonding options are put in the ifcfg file instead
#print FILE "options $bond mode=balance-rr miimon=100\n";
close FILE;

# create array of network info. Needed in case where there are 
# more than one ip address per nic and shouldn't be many networks.
my $net_info;
my $cnt = 1;

while ( $cnt <= $net_cnt ) {
    $net_info = $ENV{"NETWORKS_LINE$cnt"};
    $net_info =~ /^netname=([^\|]*)\|\|/; 
    $net_name = $1;
    $net_info =~ /net=([^\|]*)\|\|/;
    $subnet = $1;
    $net_info =~ /mask=([^\|]*)\|\|/;
    $netmask = $1;
    push @{ $networks[$cnt-1] }, ($net_name, $subnet, $netmask);
    $cnt +=1; 
}

# get network or networks for this nic from NICNETWORKS: 
# eth0:1_0_0_0-255_255_0_0|network2,eth1:1_1_0_0
# create array of networks for this nic
foreach my $nic_networks (split(/,/,$nicnetworks)) {
    my @net = ();
    if ( $nic_networks =~ /!/ ) {
        @net = split(/!/,$nic_networks);
    } else {
        @net = split(/:/,$nic_networks);
    }
    if ($net[0] eq $nic) {
        @nic_nets = split(/\|/,$net[1]);
        last;
    }
}

# get all nic ipaddress from $nicips: i.e. eth0:1.0.0.1|2.0.0.1,eth1:1.1.1.1
# Then get all ips for this specific nic, i.e. eth0.
foreach my $ips (split(/,/,$nicips)) {
    my @ip = ();
    if ( $ips =~ /!/ ) {
        @ip = split(/!/,$ips);
    } else {
        @ip = split(/:/,$ips);
    }
    if ($ip[0] eq $nic ) {
        @nic_ips = split(/\|/,$ip[1]);
    }
}


my $i;
for ($i=0; $i < (scalar @nic_ips) ; $i++ ) {

    # Time to create the interfaces.
    # loop through the nic networks, find the matching networks to get the
    # subnet and netmask and then create the appropriate ifcfg file for linux
    my $specific_nic = $nic;
    if ($i > 0) {
       $specific_nic = $nic . ":" . ($i);
    }

    #todo: support case in which nicnetworks is not specified, find the correct network by calculation
    $cnt = 0;
    $subnet = "";
    $netmask = "";
    $net_name = "";
    while ( $cnt < $net_cnt ) {
        if ( $networks[$cnt][0] eq $nic_nets[$i] ) {
        
            $subnet = $networks[$cnt][1];
            $netmask = $networks[$cnt][2];
            $cnt = $net_cnt; # found match - get out.
        } 
        else {
            $cnt++; 
        }
    }

    # check that there is a subnet and netmask set
    if ( !(length($subnet) > 0) || !(length($netmask) > 0) ) {
        system("logger -t xcat -p local4.err  'configbond: network subnet or netmask not set.'");
        exit 1;
    }
        system("logger -t xcat -p local4.err  'configbond: network subnet and netmask: $subnet, $netmask'");
        system("logger -t xcat -p local4.err  'configbond: $specific_nic, $nic_ips[$i]'");

    # Write the master info to the ifcfg file
    if (-d "/etc/sysconfig/network-scripts") {
        # rhel/centos/fedora
        my $dir = "/etc/sysconfig/network-scripts";
        if (!open(FILE, ">$dir/ifcfg-$bond")) { system("logger -t xcat -p local4.err 'configbond: cannot open $dir/ifcfg-$bond.'"); exit 1; }

        print FILE "DEVICE=$bond\n";
        print FILE "BOOTPROTO=none\n";
        print FILE "IPADDR=$nic_ips[$i]\n";
        print FILE "NETMASK=$netmask\n";
        print FILE "ONBOOT=yes\n";
        print FILE "USERCTL=no\n";
        print FILE qq(BONDING_OPTS="$bondingopts"\n);
        close FILE;

        # Configure slaves
        my @output = `ip addr show 2>&1`;       # to check for existance of the device later
        foreach my $dev (@devs) {
            # as a convenience, make sure the device exists before adding it to the bond
            if (!grep(m/^\d+:\s+$dev:/, @output)) {
                system("logger -t xcat -p local4.err  'configbond: not configuring $dev because it does not exist.'");
                unlink("$dir/ifcfg-$dev");          # in case it was left over in the image we are cloning
                next;
            }

            system("logger -t xcat -p local4.err  'configbond: slave dev: $dev'");
            if (!open(FILE, ">$dir/ifcfg-$dev")) { system("logger -t xcat -p local4.err 'configbond: cannot open $dir/ifcfg-$dev'"); exit 1; }
            print FILE "DEVICE=$dev\n";
            print FILE "BOOTPROTO=none\n";
            print FILE "MASTER=$bond\n";
            print FILE "ONBOOT=yes\n";
            print FILE "SLAVE=yes\n";
            print FILE "USERCTL=no\n";
            close FILE;
        }
        }
    elsif (-d "/etc/sysconfig/network") {
        # sles
        my $dir = "/etc/sysconfig/network";
        if (!open(FILE, ">$dir/ifcfg-$bond")) { system("logger -t xcat -p local4.err 'configbond: cannot open $dir/ifcfg-$bond.'"); exit 1; }

        print FILE "BOOTPROTO=static\n";
        print FILE "BONDING_MASTER=yes\n";
        print FILE "BONDING_MODULE_OPTS='$bondingopts'\n";
        print FILE "NAME='Bonded Interface'\n";
        print FILE "IPADDR=$nic_ips[$i]\n";
        print FILE "NETMASK=$netmask\n";
        print FILE "STARTMODE=onboot\n";
        print FILE "USERCONTROL=no\n";
        my $devnum = 0;
        my @output = `ip addr show 2>&1`;       # to check for existance of the device later
        foreach my $dev (@devs) {
            if (!grep(m/^\d+:\s+$dev:/, @output)) { next; }
            print FILE "BONDING_SLAVE_$devnum=$dev\n";
            $devnum++;
        }
        close FILE;

        # Configure slaves
        foreach my $dev (@devs) {
            # as a convenience, make sure the device exists before adding it to the bond
            if (!grep(m/^\d+:\s+$dev:/, @output)) {
                system("logger -t xcat -p local4.err  'configbond: not configuring $dev because it does not exist.'");
                unlink("$dir/ifcfg-$dev");          # in case it was left over in the image we are cloning
                next;
            }
            
            system("logger -t xcat -p local4.err  'configbond: slave dev: $dev'");
            if (!open(FILE, ">$dir/ifcfg-$dev")) { system("logger -t xcat -p local4.err 'configbond: cannot open $dir/ifcfg-$dev'"); exit 1; }
            print FILE "BOOTPROTO=none\n";
            print FILE "STARTMODE=hotplug\n";
            close FILE;
        }
        }
    else {
        # do not recognize this distro
        system("logger -t xcat -p local4.err 'configbond: network directory is not either the Red Hat or SuSE format.'");
        exit 1;
    }

    # Apply the changes.  Since we are only doing bond1 right now, lets not restart the whole network
    # so we dont disrupt the installnic connection.  Instead we just need to bring down the slave nics,
    # and then bring up the bond nic.
    #runcmd("service network restart");
    foreach my $dev (@devs) {
        runcmd("ifdown $dev");
    }
    runcmd("ifdown $bond");     # in case it was already up
    runcmd("ifup $bond");       # note: this wont reload the bonding kernel module, so we are depending on the provisioning process to already have set the correct bonding options
    system("logger -t xcat -p local4.info 'configbond: successfully configured $specific_nic.'");

}
exit 0;

sub runcmd {
	my $cmd = shift @_;
	$cmd .= ' 2>&1';
	my @output = `$cmd`;
	my $rc = $? >> 8;
	if ($rc) {
		system("logger -t xcat -p local4.err 'configeth: command $cmd failed with rc $rc: " . join('',@output) . "'");
		my $errout= "configeth: command $cmd failed with rc $rc.";
                `echo $errout`;
		exit $rc;
	}
}