feat: complete basic functions

Support http,dns and mysql connection. Support custom http, dns response. Support dns rebinding.
Support mysql load local files and jdbc deserialize exploit.

internal/rule/rule.go

@@ -0,0 +1,65 @@
+package rule
+
+import (
+	"regexp"
+	"time"
+
+	log "unknwon.dev/clog/v2"
+)
+
+type Rule interface {
+	CreateOrUpdate() error
+	Delete() error
+}
+
+type BaseRule struct {
+	Rule         `gorm:"-" json:"-"`
+	ID           uint           `gorm:"primarykey" form:"id" json:"id"`
+	CreatedAt    time.Time      `json:"created_at"`
+	UpdatedAt    time.Time      `json:"updated_at"`
+	Name         string         `gorm:"index;unique;not null;" form:"name" json:"name"`
+	FlagFormat   string         `gorm:"unique;not null;" form:"flag_format" json:"flag_format"`
+	flagCatcher  *regexp.Regexp `gorm:"-" json:"-"`
+	Rank         int            `gorm:"default:0" json:"rank" form:"rank"`
+	PushToClient bool           `gorm:"default:false;not null;" form:"push_to_client" json:"push_to_client"`
+	Notice       bool           `gorm:"default:false;not null;" form:"notice" json:"notice"`
+}
+
+func compileCatcher(flagFormat string) (reg *regexp.Regexp, err error) {
+	if reg, err := regexp.Compile(flagFormat); err == nil {
+		return reg, nil
+	} else {
+		// * meaning record all connections.
+		if flagFormat != "*" {
+			return nil, err
+		} else {
+			return nil, nil
+		}
+	}
+}
+
+func (br BaseRule) Match(s string) (flag, flagGroup string) {
+	if br.flagCatcher == nil && br.FlagFormat != "*" {
+		//	compile rule flags
+		catcher, err := compileCatcher(br.FlagFormat)
+		if err != nil {
+			log.Error("%s(rule:%s)", err.Error(), br.Name)
+		}
+		br.flagCatcher = catcher
+	}
+
+	if br.flagCatcher == nil {
+		// capture all connection.
+		flag = "*"
+	} else {
+		matched := br.flagCatcher.FindStringSubmatch(s)
+		if len(matched) == 0 {
+			return
+		}
+		flag = matched[0]
+		if len(matched) > 1 {
+			flagGroup = matched[1]
+		}
+	}
+	return
+}