interface_information.sh
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##
# retrieve interfaces. I prefer using ip if it is
# available, else I fallback to ifconfig... don't know
# how to retrieve this information on other systems.
# This also exports the environment variables.
#
gather_interface_info() {
[ -z "${NINTERFACES}" ] || return
local NO=1
if [ ${IP} ]
then
gather_if_info_ip
else
if [ ${IFCONFIG} ]
then
gather_if_info_ifconfig
else
${LOGGER} -p local0.warn 'Found no way to retrieve interface information.'
fi
fi
export NINTERFACES
while [ ${NO} -le ${NINTERFACES:=0} ]
do
export IF${NO}_NAME IF${NO}_MAC IF${NO}_STATE IF${NO}_IPV4 IF${NO}_IPV6
NO=$((NO+1))
done
}
##
# get the interface information from the ip tool
#
gather_if_info_ip() {
eval $(${IP} -o link | ${AWK} '{
sub(/:/,"",$1);
ifno=$1;
sub(/:/,"",$2);
name=$2;
classes=classes "net_iface_" name " ";
for (i=3; i<NF; i++) {
if ($i == "state") {
i++; state=$i
}
if ($i ~ /link/) {
i++; mac=$i;
classes=classes mac " "
}
}
print "IF" no "_NAME=" name ";IF" no "_STATE=" state ";IF" no "_MAC=" mac ";";
if ("UP" == state) classes=classes mac " ";
if_numbers=if_numbers " " ifno;
no+=1
}
BEGIN {
classes="";
no=1;
if_numbers=""
}
END {
print "set_class " classes ";";
print "NINTERFACES=" FNR ";"
sub(/^ */,"",if_numbers);
sub(/ *$/,"",if_numbers);
print "IF_NUMBERS=\"" if_numbers "\";";
}')
eval $(${IP} -o addr | ${AWK} -v if_numbers="${IF_NUMBERS}" '{
sub(/:/,"",$1);
if_no=$1;
no=r_if_numbers[if_no];
if ($3 == "inet") {
split($4,addr,/[\/]/);
print "IF" no "_IPV4=\"${IF" no "_IPV4}" addr[1] " \";";
network(no, addr[1], addr[2]);
classes=classes addr[1] " "
}
if ($3 == "inet6") {
split($4,addr,/[\/]/);
print "IF" no "_IPV6=\"${IF" no "_IPV6}" addr[1] " \";";
classes=classes addr[1] " "
}
}
BEGIN {
classes="";
sub(/^ */,"",if_numbers);
sub(/ *$/,"",if_numbers);
split(if_numbers,tmp_array,/ /)
for(no in tmp_array) {
if_no=tmp_array[no];
r_if_numbers[if_no]=no;
}
}
END {
print "set_class " classes ";"
}
function network(no, addr, cidr) {
mask="";
net="";
full_octets=cidr/8;
part_octets=cidr%8;
split(addr,parts,/\./);
for(i=1; i<5; i++) {
if(i-1 < full_octets) {
mask=mask "255";
net=net parts[i];
} else {
if (i-1 == full_octets) {
mpart=256-lshift(1, 8-part_octets);
mask=mask mpart;
net=net and(parts[i],mpart);
} else {
mask=mask "0";
net=net "0";
}
}
if (i < 4) {
mask=mask ".";
net=net ".";
}
}
classes=classes net " ";
print "IF" no "_NETWORK=\"" net "\"; export " name "_NETWORK;";
print "IF" no "_MASK=\"" mask "\"; export " name "_MASK;";
}')
}
##
# get interface data via the ifconfig tool
# FIXME This is outdated. It does not set classes at all.
#
gather_if_info_ifconfig() {
eval $(${IFCONFIG} -a | ${AWK} '
/ether/ { mac=$2 }
/inet / { ipv4=ipv4 $2 " " }
/inet6/ { ipv6=ipv6 $2 " " }
/^[^ \t]/ {
if ("" != ipv4 || "" != ipv6) state="UP"; else state="DOWN";
if ("" != name) {
print "IF" no "_NAME=" name ";IF" no "_STATE=" state ";IF" no "_MAC=" mac ";" \
"IF" no "_IPV4=\"${IF" no "_IPV4}" ipv4 " \";" \
"IF" no "_IPV6=\"${IF" no "_IPV6}" ipv6 " \";";
no++;
}
ipv4=ipv6="";
sub(/:/,"",$1);
name=$1
}
BEGIN {
no=1;
}
END {
if ("" != ipv4 || "" != ipv6) state="UP"; else state="DOWN";
print "IF" no "_NAME=" name ";IF" no "_STATE=" state ";IF" no "_MAC=" mac ";" \
"IF" no "_IPV4=\"${IF" no "_IPV4}" ipv4 " \";" \
"IF" no "_IPV6=\"${IF" no "_IPV6}" ipv6 " \";";
print "NINTERFACES=" no
}')
}
# vim: set ts=4 sw=4: