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Merged
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Dec 13, 2024
Merged

NETOBSERV-1578 subnets labels #124

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115 changes: 103 additions & 12 deletions scripts/functions.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -93,8 +93,48 @@ function namespaceFound() {
FLOWS_MANIFEST_FILE="flow-capture.yml"
PACKETS_MANIFEST_FILE="packet-capture.yml"
CONFIG_JSON_TEMP="config.json"
CLUSTER_CONFIG="cluster-config-v1.yaml"
NETWORK_CONFIG="cluster-network.yaml"
MANIFEST_OUTPUT_PATH="tmp"

function getSubnets() {
declare -n sn="$1"

# get cluster-config-v1 Configmap to retreive machine networks
installConfig=$(${K8S_CLI_BIN} get configmap cluster-config-v1 -n kube-system -o custom-columns=":data.install-config")
yaml="${MANIFEST_OUTPUT_PATH}/${CLUSTER_CONFIG}"
echo "$installConfig" >${yaml}

machines=$(yq e -oj '.networking.machineNetwork[] | select(has("cidr")).cidr' "$yaml")
if [ "${#machines}" -gt 0 ]; then
sn["Machines"]=$machines
fi

# get OCP cluster Network to retreive pod / services / external networks
networkConfig=$(${K8S_CLI_BIN} get network cluster -o yaml)
yaml="${MANIFEST_OUTPUT_PATH}/${NETWORK_CONFIG}"
echo "$networkConfig" >${yaml}

pods=$(yq e -oj '.spec.clusterNetwork[] | select(has("cidr")).cidr' "$yaml")
if [ "${#pods}" -gt 0 ]; then
sn["Pods"]=$pods
fi

services=$(yq e -oj '.spec.serviceNetwork[] | select(.)' "$yaml")
if [ "${#services}" -gt 0 ]; then
sn["Services"]=$services
fi

if [ "${#sn[@]}" -gt 0 ]; then
echo "Found subnets:"
for key in "${!sn[@]}"; do
echo " $key: ${sn[$key]}"
done
else
echo "Didn't found subnets"
fi
}

function setup {
echo "Setting up... "

Expand Down Expand Up @@ -222,6 +262,8 @@ function common_usage {
echo " --max-bytes: maximum capture bytes (default: 50000000 = 50MB)"
echo " --background: run in background (default: false)"
echo " --copy: copy the output files locally (default: prompt)"
# enrichment
echo " --get-subnets: get subnets informations (default: false)"
# filters
echo " --node-selector: capture on specific nodes (default: n/a)"
echo " --direction: filter direction (default: n/a)"
Expand Down Expand Up @@ -264,9 +306,27 @@ function packets_usage {
common_usage
}

# get current config and save it to temp file
function copyFLPConfig {
jsonContent=$(yq e '.spec.template.spec.containers[0].env[] | select(.name=="FLP_CONFIG").value' "$1")
# json temp file location is set as soon as this function is called
json="${MANIFEST_OUTPUT_PATH}/${CONFIG_JSON_TEMP}"
echo "$jsonContent" >${json}
}

# update FLP Config
function updateFLPConfig {
# get json as string with escaped quotes
jsonContent=$(cat "$1")
jsonContent=${jsonContent//\"/\\\"}

# update FLP_CONFIG env
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"FLP_CONFIG\").value|=\"$jsonContent\"" "$2"
}

function edit_manifest() {
## replace the env variable in the manifest file
echo "env: $1, env_value: $2"
## replace the configuration in the manifest file
echo "opt: $1, evalue: $2"
case "$1" in
"interfaces")
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"INTERFACES\").value|=\"$2\"" "$3"
Expand All @@ -283,6 +343,38 @@ function edit_manifest() {
"network_events_enable")
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"ENABLE_NETWORK_EVENTS_MONITORING\").value|=\"$2\"" "$3"
;;
"get_subnets")
if [[ "$2" == "true" ]]; then
declare -A subnets
getSubnets subnets

if [ "${#subnets[@]}" -gt 0 ]; then
copyFLPConfig "$3"

# get network enrich stage
enrichIndex=$(yq e -oj ".parameters[] | select(.name==\"enrich\") | document_index" "$json")
enrichContent=$(yq e -oj ".parameters[$enrichIndex]" "$json")
enrichJson="${MANIFEST_OUTPUT_PATH}/enrich.json"
echo "$enrichContent" >${enrichJson}

# add rules to network
yq e -oj --inplace ".transform.network.rules +={\"type\":\"add_subnet_label\",\"add_subnet_label\":{\"input\":\"SrcAddr\",\"output\":\"SrcSubnetLabel\"}}" "$enrichJson"
yq e -oj --inplace ".transform.network.rules +={\"type\":\"add_subnet_label\",\"add_subnet_label\":{\"input\":\"DstAddr\",\"output\":\"DstSubnetLabel\"}}" "$enrichJson"

# add subnetLabels to network
yq e -oj --inplace ".transform.network.subnetLabels = []" "$enrichJson"
for key in "${!subnets[@]}"; do
yq e -oj --inplace ".transform.network.subnetLabels += {\"name\":\"$key\",\"cidrs\":[${subnets[$key]}]}" "$enrichJson"
done

# override network
enrichJsonStr=$(cat $enrichJson)
yq e -oj --inplace ".parameters[$enrichIndex] = $enrichJsonStr" "$json"

updateFLPConfig "$json" "$3"
fi
fi
;;
"filter_enable")
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"ENABLE_FLOW_FILTER\").value|=\"$2\"" "$3"
;;
Expand Down Expand Up @@ -341,10 +433,7 @@ function edit_manifest() {
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"FILTER_DROPS\").value|=\"$2\"" "$3"
;;
"filter_regexes")
# get current config and save it to temp file
jsonContent=$(yq e '.spec.template.spec.containers[0].env[] | select(.name=="FLP_CONFIG").value' "$3")
json="${MANIFEST_OUTPUT_PATH}/${CONFIG_JSON_TEMP}"
echo "$jsonContent" >${json}
copyFLPConfig "$3"

# remove send step
yq e -oj --inplace "del(.pipeline[] | select(.name==\"send\"))" "$json"
Expand All @@ -371,12 +460,7 @@ function edit_manifest() {
# add send step back
yq e -oj --inplace ".pipeline += {\"name\":\"send\",\"follows\":\"filter\"}" "$json"

# get json as string with escaped quotes
jsonContent=$(cat $json)
jsonContent=${jsonContent//\"/\\\"}

# update FLP_CONFIG env
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"FLP_CONFIG\").value|=\"$jsonContent\"" "$3"
updateFLPConfig "$json" "$3"
;;
"log_level")
yq e --inplace ".spec.template.spec.containers[0].env[] |= select(.name==\"LOG_LEVEL\").value|=\"$2\"" "$3"
Expand Down Expand Up @@ -585,6 +669,13 @@ function check_args_and_apply() {
exit 1
fi
;;
--get-subnets) # Get subnets
if [[ "$value" == "true" || "$value" == "false" ]]; then
edit_manifest "get_subnets" "$value" "$2"
else
echo "invalid value for --get-subnets"
fi
;;
*) # Invalid option
echo "Invalid option: $key" >&2
exit 1
Expand Down
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