Unix的交流电插座服务器不接受连接 [英] Unix C socket server not accepting connections

问题描述

这里的交易，我C语言编写一个简单的TCP套接字服务器（使用UNIX系统调用），我是不是能够得到接受连接。

从我可以告诉，我通过服务器初始化拿到就好了，但是当我尝试连接到我打印出来的端口（见$ C $以下三）拒绝就好像无所不有。

更重要的是，当我用netstat端口甚至没有使用。我不扔我目前设立任何错误，我都干涸了的想法。

  INT的main（）{    INT sock_fd;
    INT conn_fd;
    结构SOCKADDR_IN serv_addr;
    结构SOCKADDR_IN cli_addr;
    socklen_t的* serlen;
    socklen_t的* clilen;
    clilen =的malloc（sizeof的（socklen_t的））;
    serlen =的malloc（sizeof的（socklen_t的））;
    * serlen = sizeof的（serv_addr）;
    * clilen = sizeof的（cli_addr）;    / * =============================创建套接字================= ============ * /
        //创建套接字
        sock_fd =插座（AF_INET，SOCK_STREAM，0）;
            如果（sock_fd℃，）{
                fprintf中（标准错误，错误创建套接字\\ n）;
                出口（1）;}        //初始化服务器地址结构体
        bzero（（字符*）及serv_addr，* serlen）;
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = INADDR_ANY;
        serv_addr.sin_port = 0;    / * =============================绑定地址================= ============= * /        //绑定套接字地址
        如果（绑定（sock_fd，（结构sockaddr *）及serv_addr，* serlen）小于0）{
            fprintf中（标准错误，错误的结合\\ n）;
            出口（1）;}        //获取数据插座
        如果（getsockname（sock_fd，（结构sockaddr *）及serv_addr，serlen）小于0）{
            fprintf中（标准错误，错误带插座的名字）;
            出口（1）;}    / * =============================服务器入门================= =========== * /        //监听连接
        听（sock_fd，32）;        //打印端口
        的printf（％i的，serv_addr.sin_port）;        conn_fd =接受（sock_fd，（结构sockaddr *）及cli_addr，clilen）;        / **做一些令人兴奋的与我的新的连接** /}
 

解决方案

道具@askmish启发这个

  //打印端口
    的printf（％i的，serv_addr.sin_port）;
 

变为

  //打印端口
    的printf（％i的，htons（serv_addr.sin_port））;
 

Here's the deal, I'm writing a simple tcp socket server in C (with unix system calls) that I'm not able to get to accept connections.

From what I can tell, I get through the server initialization just fine, but when I try to connect to the port that I print out (see code below) it refuses as if nothing is there.

More to the point, when I netstat that port isn't even in use. I'm not throwing any errors with my current set up, I'm all dried up for ideas.

int main(){

    int sock_fd;
    int conn_fd;
    struct sockaddr_in serv_addr;
    struct sockaddr_in cli_addr;
    socklen_t* serlen;
    socklen_t* clilen;
    clilen  = malloc(sizeof(socklen_t));
    serlen  = malloc(sizeof(socklen_t));
    *serlen = sizeof(serv_addr);
    *clilen = sizeof(cli_addr);

    /*=============================Create Socket=============================*/


        //Create Socket
        sock_fd = socket(AF_INET, SOCK_STREAM, 0);
            if(sock_fd<0){
                fprintf(stderr,"error creating socket\n");
                exit(1);}

        //Initialize Server Address Struct
        bzero((char *) &serv_addr, *serlen);
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = INADDR_ANY;
        serv_addr.sin_port = 0;

    /*=============================Bind Address==============================*/

        //Bind socket to an address
        if(bind(sock_fd,(struct sockaddr*)&serv_addr,*serlen)<0){
            fprintf(stderr,"error binding\n");
            exit(1);}

        //Get socket data
        if(getsockname(sock_fd,(struct sockaddr*)&serv_addr, serlen)<0){
            fprintf(stderr,"error with socket name");
            exit(1);}

    /*=============================Server Started============================*/

        //Listen for connections
        listen(sock_fd,32);

        //Print port
        printf("%i", serv_addr.sin_port);

        conn_fd = accept(sock_fd,(struct sockaddr*)&cli_addr,clilen);

        /**Do something exciting with my new connection**/

}

解决方案

props to @askmish for inspiring this one

    //Print port
    printf("%i", serv_addr.sin_port);

becomes

    //Print port
    printf("%i", htons(serv_addr.sin_port));

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