feat: 新增 TCP 连接清单窗口
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@@ -285,6 +285,12 @@ QJsonObject NetworkMonitorApplet::trafficLog() const
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return m_trafficLog;
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}
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// 返回 TCP 连接详情列表(QVariantList of QVariantMap),供 QML 连接清单窗口展示
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QVariantList NetworkMonitorApplet::tcpConnectionList() const
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{
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return m_tcpConnectionList;
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}
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// 返回当前活动接口的下行速度历史,转换为 QVariantList of QPointF 供 QML 使用
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// 设计原因:QPointF 仅携带 x/y 两个值,上传与下载分别对应两个列表;
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// 结果缓存于成员变量,仅当 m_historyDirty 时重建,避免 QML 每次读取都重新构造 300 个点
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@@ -500,6 +506,11 @@ void NetworkMonitorApplet::readNetworkStats()
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m_lowFreqCounter = 0;
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detectLowFreqStats();
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}
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// TCP 连接清单同样每 5 秒更新一次(进程名反查需遍历 /proc 开销大,不能每秒执行)
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if (++m_tcpListCounter >= 5) {
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m_tcpListCounter = 0;
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buildTcpConnectionList();
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}
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}
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void NetworkMonitorApplet::calculateSpeed()
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@@ -810,6 +821,191 @@ int NetworkMonitorApplet::countTcpConnections() const
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return count;
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}
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// 构建 TCP 连接详情列表(解析 /proc/net/tcp 与 tcp6,含进程名反查)
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// 结果存入 m_tcpConnectionList(QVariantList of QVariantMap)并发射 tcpConnectionListChanged;
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// 仅保留 ESTABLISHED(状态 01)连接。优雅降级:文件缺失/行格式异常时跳过该文件/行,不崩溃
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// 设计原因:进程名反查需遍历 /proc/<pid>/fd 开销较大,故本方法由 readNetworkStats 降频
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// 至每 5 秒调用一次;先一次性构建 inode -> pid 映射,再为每个连接查映射,避免每连接重复遍历
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void NetworkMonitorApplet::buildTcpConnectionList()
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{
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QVariantList list;
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const QStringList paths = {QStringLiteral("/proc/net/tcp"), QStringLiteral("/proc/net/tcp6")};
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// 一次性遍历 /proc 构建 socket inode -> pid 映射,供所有连接复用
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// 设计原因:连接多时遍历 /proc 是主要开销,先建映射再查询可将 O(连接数×进程数)
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// 降为 O(进程数 + 连接数),且映射缓存至下次刷新
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const QHash<qint64, qint64> inodePidMap = buildInodePidMap();
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for (const QString &path : paths) {
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const bool isV6 = path.endsWith(QStringLiteral("tcp6"));
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QFile f(path);
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if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) {
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continue;
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}
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QTextStream stream(&f);
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stream.readLine(); // 跳过标题行
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while (!stream.atEnd()) {
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const QString line = stream.readLine().trimmed();
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if (line.isEmpty()) {
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continue;
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}
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TcpConnectionInfo conn;
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if (!parseTcpLine(line, isV6, conn)) {
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continue; // 行格式异常,跳过
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}
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// 进程名反查:parseTcpLine 已将 socket inode 暂存于 conn.state,取出后覆盖为状态文本
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const qint64 inode = conn.state.toLongLong();
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const auto it = inodePidMap.constFind(inode);
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if (it != inodePidMap.constEnd()) {
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conn.processName = processNameForInode(*it);
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}
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conn.state = QStringLiteral("ESTABLISHED");
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QVariantMap item;
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item[QStringLiteral("localAddress")] = conn.localAddress;
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item[QStringLiteral("localPort")] = conn.localPort;
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item[QStringLiteral("remoteAddress")] = conn.remoteAddress;
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item[QStringLiteral("remotePort")] = conn.remotePort;
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item[QStringLiteral("state")] = conn.state;
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item[QStringLiteral("processName")] = conn.processName;
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list.append(item);
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}
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f.close();
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}
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m_tcpConnectionList = list;
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emit tcpConnectionListChanged();
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}
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// 解析单个 /proc/net/tcp 或 tcp6 行,成功返回 true 并填充 conn
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// 列格式:sl local_address:local_port rem_address:rem_port st tx_queue:rx_queue ...
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// local_address/rem_address 为十六进制 IP,端口为十六进制;st=01 为 ESTABLISHED
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// 设计原因:仅保留 ESTABLISHED 状态(与 countTcpConnections 口径一致);
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// conn.state 字段在建立映射时暂存 socket inode(第 10 列),随后由 buildTcpConnectionList
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// 覆盖为状态文本,避免再增一个中间字段
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bool NetworkMonitorApplet::parseTcpLine(const QString &line, bool isV6, TcpConnectionInfo &conn) const
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{
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const QStringList parts = line.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
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// 至少需要 10 列(含 inode),不足视为格式异常
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if (parts.size() < 10) {
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return false;
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}
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// 状态码:第 4 列(索引 3),仅保留 ESTABLISHED(01)
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if (parts[3] != QLatin1String("01")) {
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return false;
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}
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// 本地地址:端口(索引 1)
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const QStringList local = parts[1].split(QLatin1Char(':'));
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if (local.size() != 2) {
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return false;
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}
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// 远程地址:端口(索引 2)
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const QStringList remote = parts[2].split(QLatin1Char(':'));
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if (remote.size() != 2) {
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return false;
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}
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conn.localAddress = hexToIp(local[0], isV6);
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conn.localPort = local[1].toInt(nullptr, 16); // 端口为十六进制
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conn.remoteAddress = hexToIp(remote[0], isV6);
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conn.remotePort = remote[1].toInt(nullptr, 16);
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// 暂存 socket inode(第 10 列,索引 9)供进程名反查;随后会被覆盖为状态文本
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conn.state = parts[9];
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conn.processName.clear();
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return true;
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}
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// 将十六进制地址转换为可读 IP 字符串
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// IPv4(tcp):8 位十六进制,小端序按字节倒序 -> "A.B.C.D"
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// IPv6(tcp6):32 位十六进制,大端序按 8 个 16 位组 -> "xxxx:xxxx:...:xxxx"
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// 设计原因:/proc/net/tcp 的 IPv4 地址为小端字节序存储,需倒序;
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// IPv6 则按大端序存储,直接分组即可。解析失败返回空串
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QString NetworkMonitorApplet::hexToIp(const QString &hex, bool isV6) const
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{
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if (isV6) {
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if (hex.size() != 32) {
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return QString();
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}
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QStringList groups;
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for (int i = 0; i < 32; i += 4) {
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groups << hex.mid(i, 4);
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}
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return groups.join(QLatin1Char(':'));
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}
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if (hex.size() != 8) {
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return QString();
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}
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// IPv4 小端序:每 2 位十六进制为一个字节,倒序拼接
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QStringList octets;
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for (int i = 6; i >= 0; i -= 2) {
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bool ok = false;
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const int oct = hex.mid(i, 2).toInt(&ok, 16);
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octets << (ok ? QString::number(oct) : QStringLiteral("0"));
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}
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return octets.join(QLatin1Char('.'));
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}
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// 遍历 /proc/<pid>/fd 构建 socket inode -> pid 映射
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// 设计原因:进程名反查需匹配连接的 socket inode 与进程的 fd 链接(socket:[inode]);
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// 一次性遍历所有进程建立映射,供多个连接复用,避免对每个连接重复扫描 /proc
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QHash<qint64, qint64> NetworkMonitorApplet::buildInodePidMap() const
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{
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QHash<qint64, qint64> map;
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QDir procDir(QStringLiteral("/proc"));
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if (!procDir.exists()) {
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return map;
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}
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const QStringList entries = procDir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
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for (const QString &pidStr : entries) {
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// 仅处理纯数字目录(进程 PID)
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bool ok = false;
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const qint64 pid = pidStr.toLongLong(&ok);
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if (!ok || pid <= 0) {
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continue;
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}
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QDir fdDir(QStringLiteral("/proc/%1/fd").arg(pidStr));
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if (!fdDir.exists()) {
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continue; // 进程可能已退出或无权限
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}
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const QStringList fds = fdDir.entryList(QDir::NoDotAndDotDot);
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for (const QString &fd : fds) {
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// fd 为符号链接,symLinkTarget 返回其目标(如 "socket:[12345]")
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const QString link = fdDir.absoluteFilePath(fd);
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const QString resolved = QFile::symLinkTarget(link);
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if (resolved.isEmpty() || !resolved.startsWith(QStringLiteral("socket:["))) {
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continue;
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}
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// 提取 inode 数字
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const int start = resolved.indexOf(QLatin1Char('['));
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const int end = resolved.indexOf(QLatin1Char(']'));
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if (start < 0 || end <= start) {
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continue;
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}
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const qint64 inode = resolved.mid(start + 1, end - start - 1).toLongLong();
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if (inode > 0) {
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map.insert(inode, pid);
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}
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}
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}
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return map;
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}
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// 根据 socket inode 的 pid 反查进程名(读 /proc/<pid>/comm),失败返回空串
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// 设计原因:comm 为进程可执行文件名(不含路径与参数),适合清单展示;
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// 进程可能已退出导致读取失败,此时返回空串不影响其他列显示
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QString NetworkMonitorApplet::processNameForInode(qint64 pid) const
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{
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QFile comm(QStringLiteral("/proc/%1/comm").arg(pid));
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if (!comm.open(QIODevice::ReadOnly | QIODevice::Text)) {
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return QString();
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}
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const QString name = QString::fromUtf8(comm.readAll()).trimmed();
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comm.close();
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return name;
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}
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// 读取指定接口的 WiFi 信号强度(dBm)
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// 仅无线接口(wlp/wlan)有效;/proc/net/wireless 桌面环境可能不存在(返回 0)
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// 该文件每行形如 "wlp3s0: 60. -65. -256 0 ...",level(dBm)为第 3 个数值字段
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