Feature: Support HTTP protocol and add building option

common/mask.h

@@ -0,0 +1,155 @@
+#pragma once
+
+#include "commands.h"
+
+// 数据包协议封装格式
+// Copy left: 962914132@qq.com & ChatGPT
+enum PkgMaskType {
+	MaskTypeUnknown = -1,
+	MaskTypeNone,
+	MaskTypeHTTP,
+	MaskTypeNum,
+};
+
+inline ULONG UnMaskHttp(char* src, ULONG srcSize) {
+	const char* header_end_mark = "\r\n\r\n";
+	const ULONG mark_len = 4;
+
+	// 查找 HTTP 头部结束标记
+	for (ULONG i = 0; i + mark_len <= srcSize; ++i) {
+		if (memcmp(src + i, header_end_mark, mark_len) == 0) {
+			return i + mark_len;  // 返回 Body 起始位置
+		}
+	}
+	return 0;  // 无效数据
+}
+
+// TryUnMask 尝试去掉伪装的协议头.
+inline ULONG TryUnMask(char* src, ULONG srcSize, PkgMaskType& maskHit) {
+	if (srcSize >= 5 && memcmp(src, "POST ", 5) == 0) {
+		maskHit = MaskTypeHTTP;
+		return UnMaskHttp(src, srcSize);
+	}
+	maskHit = MaskTypeNone;
+	return 0;
+}
+
+// PkgMask 针对消息进一步加密、混淆或伪装.
+class PkgMask {
+protected:
+    virtual ~PkgMask() {}
+public:
+    virtual void Destroy() {
+        delete this;
+    }
+    virtual void Mask(char*& dst, ULONG& dstSize, char* src, ULONG srcSize, int cmd = -1) {
+        dst = src;
+        dstSize = srcSize;
+    }
+    virtual ULONG UnMask(char* src, ULONG srcSize) {
+        return 0;
+    }
+    virtual void SetServer(const char* addr) {}
+};
+
+class HttpMask : public PkgMask {
+public:
+    /**
+     * @brief 构造函数
+     * @param host HTTP Host 头字段
+     */
+    explicit HttpMask(const std::string& host) : product_(GenerateRandomString()), host_(host) {
+        // 初始化随机数生成器
+        srand(static_cast<unsigned>(time(nullptr)));
+        char buf[32];
+        sprintf_s(buf, "V%d.%d.%d", rand() % 10, rand() % 10, rand() % 10);
+        version_ = buf;
+        user_agent_ = GetEnhancedSystemUA(product_, version_);
+    }
+
+    /**
+     * @brief 将原始数据伪装为 HTTP 请求
+     * @param dst      [输出] 伪装后的数据缓冲区（需调用者释放）
+     * @param dstSize  [输出] 伪装后数据长度
+     * @param src      原始数据指针
+     * @param srcSize  原始数据长度
+     * @param cmd      命令号
+     */
+    void Mask(char*& dst, ULONG& dstSize, char* src, ULONG srcSize, int cmd = -1) {
+        // 生成动态 HTTP 头部
+        std::string http_header =
+            "POST " + GeneratePath(cmd) + " HTTP/1.1\r\n"
+            "Host: " + host_ + "\r\n"
+            "User-Agent: " + user_agent_ + "\r\n"
+            "Content-Type: application/octet-stream\r\n"
+            "Content-Length: " + std::to_string(srcSize) + "\r\n"
+            "Connection: keep-alive\r\n"
+            "\r\n";  // 空行分隔头部和 Body
+
+        // 分配输出缓冲区
+        dstSize = static_cast<ULONG>(http_header.size()) + srcSize;
+        dst = new char[dstSize];
+
+        // 拷贝数据：HTTP 头部 + 原始数据
+        memcpy(dst, http_header.data(), http_header.size());
+        memcpy(dst + http_header.size(), src, srcSize);
+    }
+
+    /**
+     * @brief 从 HTTP 数据中提取原始数据起始位置
+     * @param src      收到的 HTTP 数据
+     * @param srcSize  数据长度
+     * @return ULONG   原始数据在 src 中的起始偏移量（失败返回 0）
+     */
+    ULONG UnMask(char* src, ULONG srcSize) {
+        return UnMaskHttp(src, srcSize);
+    }
+
+    void SetServer(const char* addr) {
+        host_ = addr;
+    }
+private:
+    static std::string GetEnhancedSystemUA(const std::string& appName, const std::string& appVersion) {
+#ifdef _WIN32
+        OSVERSIONINFOEX osvi = {};
+        osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+        GetVersionEx((OSVERSIONINFO*)&osvi);
+
+        // 获取系统架构
+        SYSTEM_INFO si;
+        GetNativeSystemInfo(&si);
+        std::string arch = (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64) ? "Win64; x64" :
+            (si.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_ARM64) ? "Win64; ARM64" :
+            "WOW64";
+
+        return "Mozilla/5.0 (" +
+            std::string("Windows NT ") +
+            std::to_string(osvi.dwMajorVersion) + "." +
+            std::to_string(osvi.dwMinorVersion) + "; " +
+            arch + ") " +
+            appName + "/" + appVersion;
+#else
+        return "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36";
+#endif
+    }
+
+    std::string host_;      // 目标主机
+    std::string product_;   // 产品名称
+    std::string version_;   // 产品版本
+    std::string user_agent_;// 代理名称
+
+    /** 生成随机 URL 路径 */
+    std::string GenerateRandomString(int size = 8) const {
+        static const char charset[] = "abcdefghijklmnopqrstuvwxyz0123456789";
+        char path[32];
+        for (int i = 0; i < size; ++i) {
+            path[i] = charset[rand() % (sizeof(charset) - 1)];
+        }
+        path[size] = 0;
+        return path;
+    }
+    std::string GeneratePath(int cmd) const {
+        static std::string root = "/" + product_ + "/" + GenerateRandomString() + "/";
+        return root + (cmd == -1 ? GenerateRandomString() : std::to_string(cmd));
+    }
+};