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使用RAW lwIP作为TCP客户端,无法connect到PC机

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悬赏园豆:30 [已解决问题] 解决于 2013-01-04 15:42

PC端的服务器程序如下:

 1 #include <stdio.h>
 2 #include <winsock.h>
 3 //#include <afxsock.h>;
 4 
 5 #pragma comment(lib, "ws2_32.lib")
 6 
 7 int main(void)
 8 {
 9     int a = 0;
10     SOCKET iSock = 0, tmpSock = 0;
11     int opt = 0;
12     int iRet = 0;
13     int iRes = 0;
14     struct sockaddr_in addrLocal, addrPeer;
15     WSADATA data;
16     WORD w = MAKEWORD(2, 2);
17     WSAStartup(w, &data);
18 
19     iSock = socket(AF_INET, SOCK_STREAM, 0);
20     if (INVALID_SOCKET == iSock)
21     {
22         printf("Create socket error![%d]\n", GetLastError());
23         return 0;
24     }
25 
26     iRes = 1;
27     ioctlsocket(iSock, FIONBIO, (u_long FAR*)&iRes);
28 
29     /* 设置本地的IP地址 */
30     addrLocal.sin_family = AF_INET;
31     addrLocal.sin_port = htons(8960);
32     addrLocal.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
33     //addrLocal.sin_addr.S_un.S_addr = inet_addr("10.10.22.100");
34 
35     iRet = bind(iSock, (SOCKADDR*)&addrLocal, sizeof(SOCKADDR_IN));
36     if (iRet < 0)
37     {
38         printf("bind error\n");
39         return 0;
40     }
41 
42     iRet = listen(iSock, 5);
43     if (iRet < 0)
44     {
45         printf("listen error\n");
46         return 0;
47     }
48 
49     opt = sizeof(SOCKADDR);
50     while(1)
51     {
52         tmpSock = accept(iSock, (SOCKADDR *)&addrPeer, &opt);
53         printf("sleep 2s[%d].\n", tmpSock);
54         Sleep(1000);
55     }
56 
57     return 0;
58 }

嵌入式设备的程序如下:

int main(void)
{
    struct netif *pGB_netif, GB_netif;
    struct ip_addr IPaddr, NetMask, GateWay;

    u8 MacAddr[] = {0x00, 0x0a, 0x35, 0x00, 0x01, 0x02};

    pGB_netif = &GB_netif;

    Debugout("\r\n\r\n");
    Debugout("------------- Main vernsion 1.8-------------\r\n");
    Debugout("-----lwIP RAW Mode Demo Application ------\r\n");

    /* 1. Initialize the platform. */
    if (init_platform() < 0)
    {
        ErrorInfo("Platform initailize fail!\n");
        return -1;
    }

    /* 2. Set the IP */
    IP4_ADDR(&IPaddr, 10, 10, 22, 10);
    IP4_ADDR(&NetMask, 255, 255, 255, 0);
    IP4_ADDR(&GateWay, 10, 10, 22, 1);

    print_ip_settings(&IPaddr, &NetMask, &GateWay);

    /* 3. Initialize the lwIP stack. */
    lwip_init();

    /* 4. Add IP to network interface. */
    if (!xemac_add(pGB_netif, &IPaddr, &NetMask, &GateWay, MacAddr, PLATFORM_EMAC_BASEADDR))
    {
        ErrorInfo("Not able to add IP to the network interface!\n");
        return -1;
    }
    netif_set_default(pGB_netif);

    /* 5. Enable the interrupts. */
    platform_enable_interrupts();

    /* 6. Set up the network interface. */
    netif_set_up(pGB_netif);

    /* 7. Create the TCP server. */
    //GB_InitTCPSrv();

    GB_InitTcpClnt();

    /* 8. Dead cycle to receive data. */
    while (1)
    {
        xemacif_input(pGB_netif);
        //GB_send();
    }

    return 0;
}

err_t GB_CBF_sent(void *arg, struct tcp_pcb *tpcb, u16_t len)
{
    Debugout("Inside CBF_sent\n");
    return ERR_OK;
}

err_t GB_CBF_connect(void *arg, struct tcp_pcb *pTCPpcb, err_t errNum)
{
    //err_t errNum = 0;

    Debugout("Inside CBF for connect!\n");

    //g_pClntPCB = pTCPpcb;
    tcp_arg(pTCPpcb, NULL);
    tcp_sent(pTCPpcb, GB_CBF_sent);

    return ERR_OK;
}

static int GB_InitTcpClnt(void)
{
    struct tcp_pcb *pClntPcb = NULL;
    err_t errNum = 0;
    char cRet = 0;
    struct ip_addr RemoteIP;

    pClntPcb = tcp_new();
    if (NULL == pClntPcb)
    {
        ErrorInfo("Create client PCB error!\n");
        return RET_FAIL;
    }

    cRet = tcp_bind(pClntPcb, IPADDR_ANY, CONTROL_CHANNEL_PORT);
    if (ERR_OK != cRet)
    {
        ErrorInfo("Bind Error!\n");
        return RET_FAIL;
    }

    //tcp_arg(pClntPcb, NULL);
    //tcp_setprio(pClntPcb, TCP_PRIO_NORMAL+1);

    IP4_ADDR(&RemoteIP, 10,10,22,100);

    errNum = tcp_connect(pClntPcb, &RemoteIP, (u16_t)8960, GB_CBF_connect);
    if (ERR_OK != errNum)
    {
        ErrorInfo("Client Connect Error![%d]\n", errNum);
        return RET_FAIL;
    }

    g_pClntPCB = pClntPcb;
    //tcp_output(pClntPcb);
    //tcp_sent(pClntPcb, );

    //Debugout("Client TCP Created succussfully\n");
}

运行程序后,通过抓包工具,能看到使用lwIP的嵌入式设备发送给PC机的syn包,但是没有看到PC机的ack包,请问这个问题的原因是什么啊?

朝雾之归乡的主页 朝雾之归乡 | 初学一级 | 园豆:71
提问于:2013-01-03 20:04
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最佳答案
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原因是TCP服务器程序所在的PC机的windows防火墙拒绝了lwIP stack的TCP连接请求。

朝雾之归乡 | 初学一级 |园豆:71 | 2013-01-04 15:42
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