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CRITICAL: Add guards to all unquoted AWK arithmetic expressions

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Multiple locations had unquoted bash variables in AWK BEGIN blocks
that could fail if variables were empty or malformed:

- Lines 3369, 3375: Added fallbacks to domain/traffic counts
- Lines 2338, 2383: Added error handling to percentage calculations
- Lines 2657-2663: Added guards to bandwidth calculations
- Line 2686: Added guards to domain traffic breakdown calculations

All AWK arithmetic now uses ${var:-0} defaults and 2>/dev/null
error suppression to prevent syntax errors from empty values.
This commit is contained in:
Developer
2026-04-23 21:20:33 -04:00
parent 63e6cf067e
commit 01b63c6ad4
1 changed files with 25 additions and 25 deletions
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modules/security/bot-analyzer.sh
+25 -25
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@@ -2333,9 +2333,9 @@ generate_report() {
# Traffic breakdown
echo "Traffic Breakdown:"
while read -r line; do
count=$(echo "$line" | awk '{print $1}')
type=$(echo "$line" | awk '{print $2}')
pct=$(awk "BEGIN {printf \"%.1f\", ($count/$total_requests)*100}")
count=$(echo "$line" | awk '{print $1}' || echo "0")
type=$(echo "$line" | awk '{print $2}' || echo "unknown")
pct=$(awk "BEGIN {printf \"%.1f\", (${count:-0}/${total_requests:-1})*100}" 2>/dev/null || echo "0.0")
case $type in
legit) echo " Legitimate Bots: $(printf "%'7d" $count) ($pct%)" ;;
@@ -2378,9 +2378,9 @@ generate_report() {
echo ""
echo "Response Code Analysis:"
while read -r line; do
count=$(echo "$line" | awk '{print $1}')
code=$(echo "$line" | awk '{print $2}')
pct=$(awk "BEGIN {printf \"%.1f\", ($count/$total_requests)*100}")
count=$(echo "$line" | awk '{print $1}' || echo "0")
code=$(echo "$line" | awk '{print $2}' || echo "000")
pct=$(awk "BEGIN {printf \"%.1f\", (${count:-0}/${total_requests:-1})*100}" 2>/dev/null || echo "0.0")
case $code in
200) echo " 200 (Success): $(printf "%'7d" $count) ($pct%) Bots are getting data" ;;
@@ -2654,13 +2654,13 @@ generate_report() {
echo " Top bandwidth consumers:"
head -3 "$TEMP_DIR/large_transfers.txt" | while read -r line; do
count=$(echo "$line" | awk '{print $1}')
ip=$(echo "$line" | awk '{print $2}' | cut -d'|' -f1)
domain=$(echo "$line" | awk '{print $2}' | cut -d'|' -f2)
url=$(echo "$line" | awk '{print $2}' | cut -d'|' -f3)
size=$(echo "$line" | awk '{print $2}' | cut -d'|' -f4)
size_mb=$(awk "BEGIN {printf \"%.1f\", $size/1048576}")
total_ip_mb=$(awk "BEGIN {printf \"%.0f\", $size * $count / 1048576}")
count=$(echo "$line" | awk '{print $1}' || echo "0")
ip=$(echo "$line" | awk '{print $2}' 2>/dev/null | cut -d'|' -f1 || echo "unknown")
domain=$(echo "$line" | awk '{print $2}' 2>/dev/null | cut -d'|' -f2 || echo "unknown")
url=$(echo "$line" | awk '{print $2}' 2>/dev/null | cut -d'|' -f3 || echo "unknown")
size=$(echo "$line" | awk '{print $2}' 2>/dev/null | cut -d'|' -f4 || echo "0")
size_mb=$(awk "BEGIN {printf \"%.1f\", ${size:-0}/1048576}" 2>/dev/null || echo "0.0")
total_ip_mb=$(awk "BEGIN {printf \"%.0f\", ${size:-0} * ${count:-0} / 1048576}" 2>/dev/null || echo "0")
printf " %s transfers from %s - %.1f MB avg (%s MB total) - %s%s\n" "$count" "$ip" "$size_mb" "$total_ip_mb" "$domain" "$url"
done
echo " Action: Verify if scraping, consider serving WebP/optimized images"
@@ -2673,17 +2673,17 @@ generate_report() {
counter=1
while read -r line && [ "${counter:-0}" -le 5 ]; do
count=$(echo "$line" | awk '{print $1}')
domain=$(echo "$line" | awk '{print $2}')
count=$(echo "$line" | awk '{print $1}' || echo "0")
domain=$(echo "$line" | awk '{print $2}' || echo "unknown")
echo "[$counter] $domain - $count requests"
# Show traffic breakdown for this domain
if [ -f "$TEMP_DIR/domain_${domain}_stats.txt" ]; then
tail -n +2 "$TEMP_DIR/domain_${domain}_stats.txt" | while read -r stat_line; do
stat_count=$(echo "$stat_line" | awk '{print $1}')
stat_type=$(echo "$stat_line" | awk '{print $2}')
pct=$(awk "BEGIN {printf \"%.1f\", ($stat_count/$count)*100}")
stat_count=$(echo "$stat_line" | awk '{print $1}' || echo "0")
stat_type=$(echo "$stat_line" | awk '{print $2}' || echo "unknown")
pct=$(awk "BEGIN {printf \"%.1f\", (${stat_count:-0}/${count:-1})*100}" 2>/dev/null || echo "0.0")
case $stat_type in
suspicious) echo -e " ${YELLOW}Suspicious: $stat_count ($pct%)${NC}" ;;
@@ -3364,15 +3364,15 @@ generate_recommendations() {
attack_scope="single_domain"
primary_target=$(head -1 "$TEMP_DIR/domain_high_risk_ips.txt" 2>/dev/null | cut -d'|' -f1)
# Calculate what % of high-risk IPs are targeting this domain
local domain_risk_count=$(head -1 "$TEMP_DIR/domain_high_risk_ips.txt" 2>/dev/null | cut -d'|' -f2)
if [ "${total_high_risk_ips:-0}" -gt 0 ]; then
primary_target_percentage=$(awk "BEGIN {printf \"%.0f\", ($domain_risk_count / $total_high_risk_ips) * 100}")
local domain_risk_count=$(head -1 "$TEMP_DIR/domain_high_risk_ips.txt" 2>/dev/null | cut -d'|' -f2 || echo "0")
if [ "${total_high_risk_ips:-0}" -gt 0 ] && [ "${domain_risk_count:-0}" -gt 0 ]; then
primary_target_percentage=$(awk "BEGIN {printf \"%.0f\", (${domain_risk_count:-0} / ${total_high_risk_ips:-0}) * 100}")
fi
elif [ "${affected_domains:-0}" -gt 1 ] && [ "${total_domains:-0}" -gt 1 ]; then
# Check if one domain is getting most of the traffic
local top_domain_count=$(head -1 "$TEMP_DIR/domain_threats_sorted.txt" 2>/dev/null | cut -d'|' -f5)
local top_domain_count=$(head -1 "$TEMP_DIR/domain_threats_sorted.txt" 2>/dev/null | cut -d'|' -f5 || echo "0")
if [ "${top_domain_count:-0}" -gt 0 ] && [ "${total_high_risk_ips:-0}" -gt 0 ]; then
local top_percentage=$(awk "BEGIN {printf \"%.0f\", ($top_domain_count / $total_high_risk_ips) * 100}")
local top_percentage=$(awk "BEGIN {printf \"%.0f\", (${top_domain_count:-0} / ${total_high_risk_ips:-0}) * 100}")
if [ "$top_percentage" -ge 75 ]; then
attack_scope="primary_target"
primary_target=$(head -1 "$TEMP_DIR/domain_threats_sorted.txt" 2>/dev/null | cut -d'|' -f1)