ioctl使线路消失

Question

我对ioctl有意见(我想)。

该软件是一个debian软件包，安装在计算机的启动过程中，然后立即启动。该软件通过使用/etc/网络/接口建立网络。IP和Net掩码被写入接口配置文件，路由通过接口配置文件中的up命令添加。

# CONFIG_MARKER eth0
auto eth0
iface eth0 inet static
address 192.168.0.237
netmask 255.255.255.0
up route add -net 192.168.0.0 netmask 255.255.255.0 gateway 192.168.0.126 dev eth0
down route del -net 192.168.0.0 netmask 255.255.255.0 gateway 192.168.0.126 dev eth0
up route add default gateway 192.168.0.126 dev eth0
down route del default gateway 192.168.0.126 dev eth0
# CONFIG_MARKER eth0

# CONFIG_MARKER prp1
auto prp1
iface prp1 inet static
address 192.168.20.237
netmask 255.255.255.0
up route add -net 192.168.20.0 netmask 255.255.255.0 gateway 192.168.20.1 dev prp1
down route del -net 192.168.20.0 netmask 255.255.255.0 gateway 192.168.20.1 dev prp1

在创建配置文件之后，软件使用ifdown和ifup启动设置的接口。(因此，每个接口首先在接口configt文件中设置，然后通过ifup启动，因此一个接口被配置，然后启动，然后下一个接口被配置并启动.)

现在，当我使用使用ioctl读取接口信息的函数(命令行)时，问题就出现了，在调用之后，路由表将为空(或者更确切地说，接口配置文件中添加的手动通道up命令将消失)。

该函数只从查询接口的套接字上读取打开的文件描述符中的数据，然后不设置任何数据。

完全出乎意料的是，在删除路由之后，我手动(从命令行)调用接口上的ifdown和ifup，对带有ioctl的函数的调用(在启动时将删除配置的路由)将不再删除路由。

有人能告诉我这里有什么问题吗？(例如，接口eth0是一个服务接口，其中包含对网站的调用。接口prp1是一个虚拟接口，它封装了两个真实的接口，eth1和eth2在PRP上没有配置。还有一些SCL设置正在进行，内部也使用ioctl进行接口查询。我确信，所描述的行为不应归咎于IEC61850通信设置。)

编辑

根据请求，导致问题的函数的代码：

NetworkInterface::NicParameter NetworkHelper::getNicParameter(
        const std::string& ifaceName) {

    NetworkInterface::NicParameter nicParam;

    nicParam.ifaceName  = ifaceName;
    nicParam.opState    = getOperationalState(ifaceName);
    nicParam.opMode     = getOperationalMode(ifaceName);
    nicParam.linkStatus = getLinkStatus(ifaceName);
    nicParam.speed      = getSpeed(ifaceName);

    // Get the IP address of the current interface.
    int fd = socket(AF_INET, SOCK_DGRAM, 0);
    struct ifreq ifr;
    ifr.ifr_addr.sa_family = AF_INET;

    // Copy the interface name in the ifreq structure.
    strncpy(ifr.ifr_name, ifaceName.c_str(), IFNAMSIZ - 1);
    // get the ip address.
    ioctl(fd, SIOCGIFADDR, &ifr);
    nicParam.ipAddress
        = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr);

    // Get the netmask of the current interface.
    ioctl(fd, SIOCGIFNETMASK, &ifr);
    nicParam.netmask
        = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr);

    // Get the gateway address of the current interface.
    ioctl(fd, SIOCGIFDSTADDR, &ifr);
    nicParam.gateway = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr);

    // Get the broadcast address of the current interface.
    ioctl(fd, SIOCSIFBRDADDR, &ifr);
    nicParam.broadcastAddress
            = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr);

    // Get the broadcast address of the current interface.
    struct ifreq req;
    strcpy(req.ifr_name, ifaceName.c_str());
    char macAddress[18]; // 17 characters + null terminator
                         // example: 01:02:03:04:05:06
    if (ioctl(fd, SIOCGIFHWADDR, &req) != -1) {
        uint8_t *mac = reinterpret_cast<uint8_t *>(
            req.ifr_ifru.ifru_hwaddr.sa_data);
        sprintf(macAddress, "%02X:%02X:%02X:%02X:%02X:%02X",
                mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
    }
    nicParam.macAddress = std::string(macAddress);

    close(fd);

    // Get the total number of received bytes.
    int returnValue;
    std::string procNetDev = "cat /proc/net/dev | grep " + ifaceName;
    nicParam.receivedPackets.numBytes = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $2}'", returnValue);

    // Get the total number of received packets.
    // Include the number of faulty and dropped packets.
    nicParam.receivedPackets.numPackets = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $3}'", returnValue);
    nicParam.receivedPackets.numErrors = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $4}'", returnValue);
    nicParam.receivedPackets.numDroppedPackets = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $5}'", returnValue);

    // Get the total number of transmitted bytes.
    nicParam.transmittedPackets.numBytes = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $10}'", returnValue);

    // Get the total number of transmitted packets.
    // Include the number of faulty and dropped packets.
    nicParam.transmittedPackets.numPackets = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $11}'", returnValue);
    nicParam.transmittedPackets.numErrors = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $12}'", returnValue);
    nicParam.transmittedPackets.numDroppedPackets = OsHelper::executeCommandInt(
        procNetDev + " | awk '{print $13}'", returnValue);

    // Check if DHCP is enabled or not.
    returnValue = 0;
    OsHelper::executeCommand("cat /etc/network/interfaces | grep -v '#' | grep "
        + ifaceName + " | grep dhcp", returnValue);
    if (returnValue == 0)
        nicParam.dhcpState = "enabled";
    else
        nicParam.dhcpState = "disabled";

    return nicParam;
}

广播没有被正确的检索，它的其他一些函数调用真的.别介意！

Answer 1

所以我发现我的问题..。这是个有点尴尬的错误。

在这个函数中，您会发现"ioctl(fd，SIOCSIFBRDADDR，&ifr)“，当在一行中看到时，如果没有所有其他调用，就会清楚地”设置“一个参数，而不是检索它(广播地址siocS.而不是siocG)。并且在接口线上设置一些东西会导致路由明显被删除，因为NIC改变了，这些路由将是错误的。

阅读的时候。