mirror of
https://github.com/swissmakers/fail2ban-ui.git
synced 2026-04-11 13:47:05 +02:00
126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
// Fail2ban UI - A Swiss made, management interface for Fail2ban.
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//
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// Copyright (C) 2025 Swissmakers GmbH (https://swissmakers.ch)
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//
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// Licensed under the GNU General Public License, Version 3 (GPL-3.0)
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// You may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.gnu.org/licenses/gpl-3.0.en.html
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package web
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import (
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"fmt"
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"strings"
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"sync"
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"time"
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"github.com/likexian/whois"
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)
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var (
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whoisCache = make(map[string]cachedWhois)
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whoisCacheMutex sync.RWMutex
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cacheExpiry = 24 * time.Hour
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)
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type cachedWhois struct {
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data string
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timestamp time.Time
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}
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// lookupWhois performs a whois lookup for the given IP address.
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// It uses caching to avoid repeated queries for the same IP.
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func lookupWhois(ip string) (string, error) {
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// Check cache first
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whoisCacheMutex.RLock()
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if cached, ok := whoisCache[ip]; ok {
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if time.Since(cached.timestamp) < cacheExpiry {
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whoisCacheMutex.RUnlock()
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return cached.data, nil
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}
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}
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whoisCacheMutex.RUnlock()
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// Perform whois lookup with timeout
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done := make(chan string, 1)
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errChan := make(chan error, 1)
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go func() {
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whoisData, err := whois.Whois(ip)
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if err != nil {
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errChan <- err
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return
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}
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done <- whoisData
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}()
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var whoisData string
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select {
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case whoisData = <-done:
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// Success - cache will be updated below
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case err := <-errChan:
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return "", fmt.Errorf("whois lookup failed: %w", err)
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case <-time.After(10 * time.Second):
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return "", fmt.Errorf("whois lookup timeout after 10 seconds")
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}
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// Cache the result
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whoisCacheMutex.Lock()
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whoisCache[ip] = cachedWhois{
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data: whoisData,
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timestamp: time.Now(),
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}
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// Clean old cache entries if cache is getting large
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if len(whoisCache) > 1000 {
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now := time.Now()
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for k, v := range whoisCache {
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if now.Sub(v.timestamp) > cacheExpiry {
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delete(whoisCache, k)
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}
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}
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}
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whoisCacheMutex.Unlock()
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return whoisData, nil
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}
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// extractCountryFromWhois attempts to extract country code from whois data.
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// This is a fallback if GeoIP lookup fails.
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func extractCountryFromWhois(whoisData string) string {
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lines := strings.Split(whoisData, "\n")
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for _, line := range lines {
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line = strings.TrimSpace(line)
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lineLower := strings.ToLower(line)
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// Look for country field
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if strings.HasPrefix(lineLower, "country:") {
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parts := strings.SplitN(line, ":", 2)
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if len(parts) == 2 {
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country := strings.TrimSpace(parts[1])
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if len(country) == 2 {
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return strings.ToUpper(country)
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}
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}
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}
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// Alternative format
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if strings.HasPrefix(lineLower, "country code:") {
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parts := strings.SplitN(line, ":", 2)
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if len(parts) == 2 {
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country := strings.TrimSpace(parts[1])
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if len(country) == 2 {
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return strings.ToUpper(country)
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}
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}
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}
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}
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return ""
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}
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