#!/usr/bin/perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html

# confignics postscript for configuring additional ethernet and ib NIC adapters. 
# This module parses NIC environment variables containing data from the nics table
# for the specific node i.e.:
# NICNODE             - the node name
# NICIPS              - comma separated list of ips per NIC
# NICHOSTNAMESUFFIXES - comma spearated list of hostname suffixes per NIC
# NICTYPES            - ethernet or infiniband
# NICCUSTOMSCRIPTS    - script to configure nic, i.e. configeth or configib
# NICNETWORKS         - network and subnetmask for the adapter.

use strict;
use Socket;
use Data::Dumper;

# Only three args are supported for confignics:
# "-s" to allow the install nic to be configured. If not set
#      then the install nic will not be configured.
# "--ibaports=x" to specify the number of ports for an ib adapter.
#                This value will set in an environment variable
#                prior to calling configib.
# "-r" unconfigure/remove existing configured nics. This flag will
#      compare existing configured nics with nics in the nics table
#      if nic doesn't exist in nics table then ifdown and remove
#      config file (ifcfg-*)


my $ibaports = 1;       # default to one port per ib adapter.
my $cfg_inst_nic = '';
my $rem_eth_nics = '';   # ethernet nics to remove if -r is set
my $rem_ib_nics = '';    # ib nics to remove if -r is set
my $rem_nics = 0;
my $arg ='';
while ($arg = shift(@ARGV)) {
    if ( $arg eq "-s" ) {
        $cfg_inst_nic = 1;
    } elsif ( $arg =~ /--ibaports=(\d)$/) {
        $ibaports = $1;
    } elsif ( $arg eq "-r" ) {
        $rem_nics = 1;
    }
}

my $ibnics = '';
my $ethnics = '';
my $bridgednics = '';
my $nicips = $ENV{NICIPS};
my $niccustomscripts = $ENV{NICCUSTOMSCRIPTS};
my $nictypes = $ENV{NICTYPES};
my $xcatpostdir = "/xcatpost";
my %cust_script_nics = (); # hash to save nics specified in niccustomscripts
my $type = '';
my $nic = '';
my $MAC = $ENV{MACADDRESS};
my $inst_nic = '';
my $thisnode = $ENV{NODE};

# After discussing with Bruce, getting install nic in following order:
# 1) get NODE env var, resolve to ip and get related nic info, if not found:
# 2) Check if INSTALLNIC is set to specific nic then use that nic, if set to "mac"
#    then use mac to get nic. If still not set then:
# 3) check PRIMARYNIC in similar manor as INSTALLNIC.
# If still not found then exit with error.

my $cfg_nic_ref_hash = {};    # set from get_install_nic
my $nic_to_cfg_ref_hash = {}; # set from env variables in mypostscript

$cfg_nic_ref_hash = get_current_nics();

$inst_nic = get_install_nic();
$bridgednics = get_bridged_nics();



# niccustomscripts specifies which NICS need to be configured. 
# and which script to use to configure it.
# Strip NIC and customscript and then call the custom script with the NIC
# it is up to the custom script to verify information passed in NIC env vars.
# i.e. if customscript is "eth1:configeth eth1, eth2:configeth2"
# then first get eth1 for the nic and "configeth eth1" for the command to run"
# the do the same for eth2.

if ( defined $niccustomscripts && length $niccustomscripts > 0 ) {
    system("logger -t xcat -p local4.info 'confignics $thisnode: processing custom scripts: $niccustomscripts '");

    foreach my $customscript (split(/,/,$niccustomscripts)) {

        my @script = ();
        if ( $customscript =~ /!/ ) {
            @script = split(/!/,$customscript);
        } else {
            @script = split(/:/,$customscript);
        }
        $cust_script_nics{$script[0]} = 1;
        my @s = split(/ /,$script[1]);

        # if installnic then verify that "-s" flag was passed in.
        if (($inst_nic ne $script[0]) || (($inst_nic eq $script[0]) && $cfg_inst_nic)) {
            runcmd("$script[1]");
            system("logger -t xcat -p local4.info 'confignics $thisnode: executed custom script: $script[1] '");
        }
    }
}

# Get nic from nicips. If nic is in cust_script_nics hash then ignore this nic.
# otherwise, get nictype if set or determine type from nic name, eth* or en* 
# implies ethernet, ib* implies infiniband.
# 
# configib prefers to have ib adapters configured in one call for performance
# reasons. So add ib nics to a list and call configib outside the loop.
foreach my $nic_ips (split(/,/,$nicips)) {
    $type = '';
    my $type_found = 0;
    $nic = '';
    my @nic_and_ips = ();
    if ( $nic_ips =~ /!/ ) {
        @nic_and_ips = split(/!/,$nic_ips);
    } else {
        @nic_and_ips = split(/:/,$nic_ips);
    }
    $nic = $nic_and_ips[0];
    # do not configure if nic is in the customscript hash
    if ($cust_script_nics{$nic_and_ips[0]} == 1 ) {
        system("logger -t xcat -p local4.info 'confignics $thisnode: nic $nic_and_ips[0] already configured through custom script '");
        
    }
    else {
        # Find matching type for this nic
        foreach my $nic_type (split(/,/,$nictypes)) {
            my @nic_and_type = ();
            if ( $nic_type =~ /!/ ) {
                @nic_and_type = split(/!/,$nic_type);
            } else {
                @nic_and_type = split(/:/,$nic_type);
            }
            if ($nic_and_type[0] eq $nic ) {
                $type = $nic_and_type[1];
                # verify type is "ethernet" or "infiniband"
                if ($type =~ /ethernet|infiniband/i ) {
                    $type_found = 1;
                }
                last;
            }    
        }
        # if no matching nic type then derive nic type from nic
        if ( !$type_found ) {
            if ( $nic =~ /(eth|en)\d+/i ) {
                $type = "ethernet";
            } elsif ($nic =~ /ib\d+/i ) {
                $type = "infiniband";
            }
        }

        if ("ethernet" eq lc($type)) {
            # Ensure to only configure the install nic if the "-s" flag was set.
            if (($inst_nic ne $nic) || (($inst_nic eq $nic) && $cfg_inst_nic)) {
                if ($ethnics) {
                    $ethnics = $ethnics . "," . $nic;
                } else {
                    $ethnics = $nic;
                }
            }
            else {
                system("logger -t xcat -p local4.info 'confignics $thisnode: Not configuring install nic $nic '");
            }
        } elsif ("infiniband" eq lc($type)) {
            if ($ibnics) {
                $ibnics = $ibnics . "," . $nic;
            } else {
                $ibnics = $nic;
            }
        } else {
            system("logger -t xcat -p local4.info 'confignics $thisnode: unknown type $type for NIC: $nic '");
        }
    }
}

# set_nics_to_remove will compare $rem_nics for install nic, and bonded or bridged nics
# and set $rem_nics to only those $nics that should be unconfigured.
if ( $rem_nics ) {
    set_nics_to_remove();
}

my $cmd = '';

# Call configeth now to configure all ethernet adapters in one call.
if ($ethnics) {
    $cmd = "configeth -c $ethnics";
}
if ( $rem_eth_nics) {
    if ($cmd) {
        $cmd = $cmd . " -u $rem_eth_nics";
    }
    else {
        $cmd = "configeth -u $rem_eth_nics";
    }
}
if ($cmd) {
    runcmd("$cmd");
    system("logger -t xcat -p local4.info 'confignics $thisnode: executed $cmd '");
}
else {
    system("logger -t xcat -p local4.info 'confignics $thisnode : no ethernet nics to configure'");
}

# Call configib now to configure all ib adapters in one call.
if ($ibnics) {
    runcmd("NIC_IBNICS=$ibnics NIC_IBAPORTS=$ibaports configib");
    system("logger -t xcat -p local4.info 'confignics $thisnode: executed script: configib for nics $ibnics '");
}

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 'confignics $thisnode: command $cmd failed with rc $rc: " . join('',@output) . "'");
		my $errout= "confignics $thisnode: command $cmd failed with rc $rc.\n";
                print $errout;
		exit $rc;
	}
	print join("\n",@output),"\n";
}


sub get_current_nics {
    my @ip_addr_array = `ip addr show`;

    my $nic_name;
    my $nic_type;
    my $nic_state;
    my $nic_slave;
    my $nic_mac;
    my $a_len = scalar(@ip_addr_array);

    my %nics;

    my $i = 0;
    while ( $i < scalar(@ip_addr_array)) {
        #print "array index $i:  @ip_addr_array[$i]\n";
        # check if line starts with "number: text:"
        # if so then it is the start of a nic stanza which looks like:
        # 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
        #     link/ether 5c:f3:fc:a8:bb:93 brd ff:ff:ff:ff:ff:ff
        #     inet 9.114.34.232/24 brd 9.114.34.255 scope global eth1
        #     inet6 fd55:faaf:e1ab:336:5ef3:fcff:fea8:bb93/64 scope global dynamic
        #        valid_lft 2591627sec preferred_lft 604427sec
        #     inet6 fd56::214:5eff:fe15:849b/64 scope global
        #        valid_lft forever preferred_lft forever
        #     inet6 fe80::5ef3:fcff:fea8:bb93/64 scope link
        #        valid_lft forever preferred_lft forever

        if ( $ip_addr_array[$i] =~ /^(\d+): / ) {
            # get nic name
            $ip_addr_array[$i] =~ /^\d+: ([^:].*):/;
            $nic_name = $1;

            # get state of nic either "UP" if different, such as DOWN, not configured
            # then assume state is DOWN.
            if ($ip_addr_array[$i] =~ /,UP/ ) {
                $nic_state = "UP";
            }
            else {
                $nic_state = "DOWN";
            }

            # Check if this nic is part of a bridge or bonded interface. If bonded on 
            # redhat then "SLAVE" or "MASTER" will be in the first line of stanza 
            # inside <>. 
            #
            # A bridged interface is a little different. The command, "brctl show", is used
            # to show information about bridged interfaces. The subroutine get_bridged_nics()
            # writes out $bridgednics which is a comma separated strings of bridged nics. 
            # If $nic_name matches a bridgednic then set nic_slave=1 for now to lump them
            # with bonded nics for now since we will not unconfigure bridged or bonded nics.
            #  
            $nic_slave = 0;  # default to 0
            if ($ip_addr_array[$i] =~ /SLAVE/ ) {
                $nic_slave = 1;
            }
            if ($ip_addr_array[$i] =~ /MASTER/ ) {
                $nic_slave = 1;
            }
            if ($nic_name =~ /$bridgednics/) {
                $nic_slave = 1;
            }

            # example output shows type is "link/ether" for ethernet or
            # "link/infiniband" for ib. Look ahead to next line for this.
            $ip_addr_array[$i+1] =~ /^\s+link\/([a-z]+) /;
            $nic_type = $1;

            $i++;

            # CHECK: it looks like there could be a usb nic ethernet adapter. Need to investigate
            #        if more needs to be done for that such as it is handled differently.
            # If value is not "ether" or "infiniband" then continue on to next stanza
            if ($nic_type ne "ether" && $nic_type ne "infiniband") {
                next;
            }

            my @line = split(' ', $ip_addr_array[$i]);
            $nic_mac = $line[1];

            # move on to next line and loop through all lines for additional information or
            # and until the line is the start of a new stanza.
            # This is where things get dicey and may need enhancements:
            #   inet 70.0.0.182/24 brd 70.0.0.255 scope global eth5
            # indicates an ipv4 address with a netmask of /24,  a broadcast address,
            # scope global nicname (eth5). If this was an aliased ip then nicname would be eth5:1 or such.
            #   inet6 fd55:faaf:e1ab:336:3640:b5ff:fe89:66c4/64 scope global dynamic
            # it appears that valid ips have "scope global"

            $i++;
            # print "NIC: $nic_name, TYPE: $nic_type, MAC: $nic_mac  SLAVE: $nic_slave, STATE: $nic_state \n";
            $nics{$nic_name}          = {};
            $nics{$nic_name}->{state} = $nic_state;
            $nics{$nic_name}->{mac}   = $nic_mac;
            $nics{$nic_name}->{slave} = $nic_slave;
            $nics{$nic_name}->{type} =  $nic_type;
            $nics{$nic_name}->{ips}     = [];

            while ($i < scalar(@ip_addr_array) && !($ip_addr_array[$i] =~ /^(\d+): / ) ) {
                # $ip_proto - is either inet or inet6
                # $ip_mask is "ipaddr or ipv6addr"/netmask and possibly "brd broadcastip"
                # $scope has the scope (global, link, site, host) if global or site then
                #      only data after scope is the nic "label", i.e. eth0, eth5:1.
                #            note that "tentative" may appear but is not a label.
                # On RH for an ip alias with same netmask/subnet then line will be:
                #    inet 11.0.0.80/16 brd 11.0.255.255 scope global secondary eth2:1

                my ($ip_proto, $ip_mask, $scope) =
                        $ip_addr_array[$i]=~/\s+(inet|inet6)\s+(.+)\s+scope\s+(.+)$/;

                if ( $ip_proto =~ /inet/ ) {  # line contains inet or inet6. Process info
                    my ($nic_ip_mask, $junk) = split(' ', $ip_mask);
                    my ($nic_ip, $nic_mask) = split('\/', $nic_ip_mask);
                    my ($sc, $label, $more_label) = split(' ', $scope);
                    if ( $sc ne "link" ) {   # this is a valid one to keep

                        if ($label eq "secondary") {
                            $label = $more_label;
                        }
                        #print "\tPROTO: $ip_proto, IP: $nic_ip, MASK: $nic_mask, SCOPE: $sc, LABEL:$label\n";
                        push @{$nics{$nic_name}->{ips}},{ip => $nic_ip, netmask => $nic_mask, label => $label };
                    }
                }
                $i++;
            }
            next;  # next nic stanza or end of file.
        }
        $i++;
    }
    return \%nics;
}

sub get_install_nic {
    # get "NODE" from env, resolve to ip and determine which nic it belongs
    # to. This should be the "base" nic, i.e. eth0, eth1 - not eth1:1
    # To do: Need to find equivalent methods for an ipv6 address.

    my $node = $ENV{NODE};
    my $installnic = $ENV{INSTALLNIC};
    my $primarynic = $ENV{PRIMARYNIC};
    my $i_p_nic = ''; # variable to hold installnic or primarynic value
    my @ip_info;
    my $inst_ip;
    my @addr_info;
    my %hash = $cfg_nic_ref_hash;

    @addr_info = gethostbyname($node);
    @ip_info = unpack("C4", $addr_info[4]); # Is this only for ipv4 or does this include ipv6 as well?
    $inst_ip = join(".",@ip_info);

    # get ip output, compare ip_addr and determine nic.

    foreach my $k (keys %$cfg_nic_ref_hash) {
        my $nic = $cfg_nic_ref_hash->{$k};
        my $ips = $nic->{'ips'};
        if (defined($ips)) {
            foreach my $ip_info (@$ips) {
                my $ip = $ip_info->{'ip'};
                # print " IP:$ip";
                if ($ip eq $inst_ip) {
                    return $k;
                }
            }
        }
    }

    # install nic not found from configured nics. Try to get install nic from environment
    # variables.
    if ($installnic) {
        $i_p_nic = $installnic;
    }
    elsif ($primarynic) {
        $i_p_nic = $primarynic;
    }

    if (!$i_p_nic) {
        system("logger -t xcat -p local4.info 'confignics $thisnode: installnic and primarynic are not defined', use 'mac' by default.");
        $i_p_nic = "mac";
    }
    
    if ($i_p_nic =~ /(e(n|th)\d+)$/ ) {
         $inst_nic = $1;
    } elsif ($i_p_nic eq "mac") {
        # determine nic from mac. Get all NICs and their mac addresses from ifconfig
        # and compare that with MACADDR.
        my @ifcfg_info = split(/\n/,`ifconfig -a | grep HWaddr | awk '{print \$1,\$5;}'`);
        foreach my $nic_mac (@ifcfg_info) {
            my @nicmac = split(/ /,$nic_mac);
            if (uc($nicmac[1]) eq uc($MAC)) {
                $inst_nic = $nicmac[0];
                last;
            }
        }
    } else { # INSTALLNIC not set or is not known
        system("logger -t xcat -p local4.info 'confignics $thisnode: install nic $inst_nic not known '");
    }
    return;
}

# subroutine compares configured nic hash with defined nics from nics table.
# If configured nic is not in nics table and it is not the install nic then 
# set global variables $rem_eth_nics and $rem_ibnics.
# This subroutine needs to be called after get_current_nics() and after parsing
# custom scripts and nics to be configured.

sub set_nics_to_remove {
    my $do_not_remove;
    my %hash = $cfg_nic_ref_hash;
    foreach my $nic_key (keys %$cfg_nic_ref_hash) {
        my $nic = $cfg_nic_ref_hash->{$nic_key};
        # check if $nic is in $ethnics, $ibnics, $cust_script_nics or is $inst_nic.
        # if not then add to appropriate list to be removed.
        if ($nic_key eq $inst_nic) {
        }
        elsif ($ethnics =~ /$nic_key/ ) {
        }
        elsif ($ibnics =~ /$nic_key/) {
        }
        elsif ($cust_script_nics{$nic_key}) {
        }
        else {
            # now check if nic is part of bonded or bridged interface. 
            #
            if ( $nic->{slave} ) {
                system("logger -t xcat -p local4.info 'confignics $thisnode: Not removing $nic_key. It is part of a bonded or bridged interface. '");
            } 
            elsif ( $nic_key =~ /@/ ) {
                # For a vlan interface on redhat the nic name appears as
                # nic.vlan@nic, i.e. eth0.30@eth0 and in this case the label will be
                # eth0.30. So verify that there is no "@" in the nic name (should we
                # also check that the label contains a "."?)

                my ($label, $base) = split(/@/,$nic_key);

                # need to make sure that $base is not added to nics to be removed.
                # add both the label and base to $do_not_remove.
                if ($do_not_remove) {
                    $do_not_remove = $label . "," . $base;
                }
                else {
                    $do_not_remove = $do_not_remove . "," . $label . "," . $base;
                }
            }
            else {
                # finally have a nic to remove. Determine if it is ib or eth
                if ($nic->{type} eq "ether") {
                    if ( $rem_eth_nics ) {
                        $rem_eth_nics = $rem_eth_nics . "," . $nic_key;
                    }
                    else {
                        $rem_eth_nics = $nic_key;
                    }
                }
                if ($nic->{type} eq "infiniband") {
                    if ( $rem_ib_nics ) {
                        $rem_ib_nics = $rem_ib_nics . "," . $nic_key;
                    }
                    else {
                        $rem_ib_nics = $nic_key;
                    }
                }
            }
        }
    }
}


# Bridged interfaces do not show differently than ethernet nics in 
# the "ip addr show" command. Therefore the command "brctl show" is 
# used to get the bridged nics.
# This subroutine will set the global variable $bridgednics.
# brctl show output is similar to:
#    bridge name     bridge id               STP enabled     interfaces
#    virbr0          8000.5254004a3d54       yes             virbr0-nic
# first line is skipped as it is the heading. The values specified by 
# bridge name and interfaces show up as nics in the "ip addr show" output. 
# Therefore need to put both of these # in the $bridgednics string 
# because we don't want to remove either of those interfaces.

sub get_bridged_nics {
    # first, ensure that brctl is installed. If not then just exit since there will be no
    # bridged interfaces.
    my $i;
    if ( -e "/usr/sbin/bcrtl" ) {
        my @bridge_out = `brctl show`;
        my $lines = scalar(@bridge_out);
        for ($i=1; $i < $lines ; $i++) {

            # brctl ouput puts half tabs '\cI' and line feed \cJ' chars in
            # the ouput. Need to convert these to spaces then split. 
            # Get first and last values for nics.

            $bridge_out[$i] =~ s/\cI/ /g;
            my @br = split(/ /,$bridge_out[$i]);
            if ( $bridgednics ) {
                $bridgednics = $bridgednics . "," . $br[0] . "," . $br[-1];
            }
            else {
                $bridgednics = $br[0] . "," . $br[-1];
            }
        }
    }
}