80 lines
2.1 KiB
Perl
80 lines
2.1 KiB
Perl
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#!/usr/bin/perl
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#
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# vim:set ts=4 sw=4:
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use strict;
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use POSIX;
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use Socket;
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use FindBin;
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use lib "$FindBin::Bin/lib";
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use l0gger;
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l0gger::init();
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use constant AF_NETLINK => 16;
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#use Socket::Netlink;
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# Netlink setup
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socket my $sock,AF_NETLINK,SOCK_RAW,0 #(domain, type, bus//protocol)
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or die "socket: $!\n";
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bind $sock, pack("vvVV",AF_NETLINK,0,0,1) #(domain, zero , pid, group);
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or die "bind: $!\n";
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while(1){
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sysread($sock,my $msg, 65535) or die "recv: $!";
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my ($ifname,$state)=(undef,undef);
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# print unpack("H*",substr($message,0,16)),"\n"; # ifi_type etc.
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$msg=substr($msg,16);
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my (undef,undef,undef,undef,undef,$type)=unpack("nnnnCC",$msg);
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$msg=substr($msg,16);
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# print "Type=$type\n";
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next if($type!=16); # RTM_NEWLINK
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while(length($msg)){
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my($len,$type)=unpack("vv",$msg);
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# print "len= $len,type=$type\n";
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last if($len<4);
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$msg=substr($msg,4);
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if ($type == 3){ # IFLA_IFNAME
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$ifname=unpack("Z*",$msg);
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}elsif($type == 16){ # IFLA_OPERSTATE
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$state=unpack("v",$msg);
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}else{
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# print "content=",unpack("H*",substr($msg,0,$len-4)),"\n";
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};
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$len=(int(($len-1)/4))*4; # 4-byte alignment
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$msg=substr($msg,$len);
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};
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next if(!defined($ifname) || !defined($state));
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# print "ifname=$ifname, state=$state\n";
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# IF_OPER_UNKNOWN (0):
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# Interface is in unknown state, neither driver nor userspace has set
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# operational state. Interface must be considered for user data as
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# setting operational state has not been implemented in every driver.
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# IF_OPER_NOTPRESENT (1):
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# Unused in current kernel (notpresent interfaces normally disappear),
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# just a numerical placeholder.
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# IF_OPER_DOWN (2):
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# Interface is unable to transfer data on L1, f.e. ethernet is not
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# plugged or interface is ADMIN down.
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# IF_OPER_LOWERLAYERDOWN (3):
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# Interfaces stacked on an interface that is IF_OPER_DOWN show this
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# state (f.e. VLAN).
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# IF_OPER_TESTING (4):
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# Unused in current kernel.
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# IF_OPER_DORMANT (5):
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# Interface is L1 up, but waiting for an external event, f.e. for a
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# protocol to establish. (802.1X)
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# IF_OPER_UP (6):
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# Interface is operational up and can be used.
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if($state==6){
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l0gger::send("$ifname up");
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};
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}
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