Add process_path rule item (#51)

* process matching supports full path
* Remove strings.ToLower

route/rule_process_name.go

@@ -0,0 +1,52 @@
+package route
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/warning"
+	C "github.com/sagernet/sing-box/constant"
+)
+
+var warnProcessNameOnNonSupportedPlatform = warning.New(
+	func() bool { return !(C.IsLinux || C.IsWindows || C.IsDarwin) },
+	"rule item `process_name` is only supported on Linux, Windows and macOS",
+)
+
+var _ RuleItem = (*ProcessItem)(nil)
+
+type ProcessItem struct {
+	processes  []string
+	processMap map[string]bool
+}
+
+func NewProcessItem(processNameList []string) *ProcessItem {
+	warnProcessNameOnNonSupportedPlatform.Check()
+	rule := &ProcessItem{
+		processes:  processNameList,
+		processMap: make(map[string]bool),
+	}
+	for _, processName := range processNameList {
+		rule.processMap[strings.ToLower(processName)] = true
+	}
+	return rule
+}
+
+func (r *ProcessItem) Match(metadata *adapter.InboundContext) bool {
+	if metadata.ProcessInfo == nil || metadata.ProcessInfo.ProcessPath == "" {
+		return false
+	}
+	return r.processMap[filepath.Base(metadata.ProcessInfo.ProcessPath)]
+}
+
+func (r *ProcessItem) String() string {
+	var description string
+	pLen := len(r.processes)
+	if pLen == 1 {
+		description = "process_name=" + r.processes[0]
+	} else {
+		description = "process_name=[" + strings.Join(r.processes, " ") + "]"
+	}
+	return description
+}