优化Firewalld添加端口方法，自动聚合连续的端口号

internal/utils/net.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"github.com/iwind/TeaGo/logs"
 	"net"
+	"sort"
 	"syscall"
 )
 
@@ -38,3 +39,34 @@ func ParseAddrHost(addr string) string {
 	}
 	return host
 }
+
+// MergePorts 聚合端口
+// 返回 [ [fromPort, toPort], ... ]
+func MergePorts(ports []int) [][2]int {
+	if len(ports) == 0 {
+		return nil
+	}
+
+	sort.Ints(ports)
+
+	var result = [][2]int{}
+	var lastRange = [2]int{0, 0}
+	var lastPort = -1
+	for _, port := range ports {
+		if port <= 0 /** 只处理有效的端口 **/ || port == lastPort /** 去重 **/ {
+			continue
+		}
+
+		if lastPort < 0 || port != lastPort+1 {
+			lastRange = [2]int{port, port}
+			result = append(result, lastRange)
+		} else { // 如果是连续的
+			lastRange[1] = port
+			result[len(result)-1] = lastRange
+		}
+
+		lastPort = port
+	}
+
+	return result
+}