C/C++ MacOS X 添加/删除路由（内核API调用方式）

liulilittle

已于 2024-08-03 23:39:48 修改

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分类专栏： C/C++ 文章标签： c语言 c++ java

于 2024-08-03 23:38:45 首次发布

本文链接：https://blog.youkuaiyun.com/liulilittle/article/details/140899016

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用例：

    SetRouteToMacOSX(RTM_ADD, inet_addr("192.168.0.24"), UINT32_MAX, inet_addr("192.168.0.1"));

    SetRouteToMacOSX(RTM_DELETE, inet_addr("192.168.0.24"), UINT32_MAX, inet_addr("192.168.0.1"));

实现：

#include <net/route.h>

bool SetRouteToMacOSX(int action, uint32_t dst, uint32_t mask, uint32_t nexthop) noexcept {
#pragma pack(push, 1)
    struct {
        struct rt_msghdr    msghdr;
        struct sockaddr_in  addr[3];
    } packet{};
#pragma pack(pop)

    packet.msghdr.rtm_msglen  = sizeof(packet);
    packet.msghdr.rtm_version = RTM_VERSION;
    packet.msghdr.rtm_type    = action;
    packet.msghdr.rtm_addrs   = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
    packet.msghdr.rtm_flags   = RTF_UP | RTA_GATEWAY;

    for (int i = 0; i < arraysizeof(packet.addr); i++) {
        auto& r      = packet.addr

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