使用RDMA的服务器上的客户端IP地址？

sudo apt-get install rdma-core ibverbs-utils

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <rdma/rdma_cma.h>

void die(const char *reason) {
    fprintf(stderr, "%s\n", reason);
    exit(EXIT_FAILURE);
}

int main(int argc, char **argv) {
    struct rdma_cm_id *listener = NULL;
    struct rdma_cm_id *client = NULL;
    struct rdma_event_channel *ec = NULL;
    struct rdma_cm_event *event = NULL;
    struct sockaddr_in addr;
    int ret;

    // 创建事件通道
    ec = rdma_create_event_channel();
    if (!ec) die("rdma_create_event_channel failed");

    // 创建 RDMA 监听器
    ret = rdma_create_id(ec, &listener, NULL, RDMA_PS_TCP);
    if (ret) die("rdma_create_id failed");

    // 绑定地址
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(20000); // 监听端口
    addr.sin_addr.s_addr = INADDR_ANY;

    ret = rdma_bind_addr(listener, (struct sockaddr *)&addr);
    if (ret) die("rdma_bind_addr failed");

    // 开始监听
    ret = rdma_listen(listener, 1);
    if (ret) die("rdma_listen failed");

    printf("Server is listening on port 20000...\n");

    // 等待连接请求
    ret = rdma_get_cm_event(ec, &event);
    if (ret) die("rdma_get_cm_event failed");

    if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
        client = event->id;

        // 获取客户端地址
        struct sockaddr_in *client_addr = (struct sockaddr_in *)rdma_get_peer_addr(client);
        char client_ip[INET_ADDRSTRLEN];
        inet_ntop(AF_INET, &(client_addr->sin_addr), client_ip, INET_ADDRSTRLEN);
        printf("Client connected from IP: %s\n", client_ip);

        // 接受连接
        struct rdma_conn_param conn_param;
        memset(&conn_param, 0, sizeof(conn_param));
        ret = rdma_accept(client, &conn_param);
        if (ret) die("rdma_accept failed");
    }

    // 清理
    rdma_ack_cm_event(event);
    rdma_destroy_id(listener);
    rdma_destroy_event_channel(ec);

    return 0;
}

gcc -o rdma_server rdma_server.c -lrdmacm -libverbs

./rdma_server