無法建立服務器客戶端連接 - 錯誤10061在C的winsock

Question

我正在嘗試在家中本地網絡中的兩台計算機上運行服務器客戶端。 第一台計算機是服務器，第二台計算機是客戶端。

嘗試連接服務器時出現錯誤10061。 （“錯誤-連接失敗。sockfd為164，errno為34，WSA為10061”）。 錯誤10061的意思是-“連接被拒絕。由於目標計算機主動拒絕了連接，所以無法建立連接。這通常是由於嘗試連接到外部主機上處於非活動狀態的服務（即沒有運行服務器應用程序的服務）導致的。”

我認為這可能是防火牆問題，所以我在防火牆中批准了Im正在使用的端口，但仍然無法正常工作。 而且，兩台計算機都具有相同的IP（為什么？）。

這是我的代碼：

server.c：

#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <tchar.h>


int socketBind(int sockfd, int port){
    struct sockaddr_in serv_addr;
    ZeroMemory((char*) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = INADDR_ANY;
    serv_addr.sin_port = htons(port);
    if ( bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 ){
        // we can check errno for exact ERROR
        printf("bind failed with errno %d\n",errno);fflush(NULL);
        return ERROR;
    }
    if ( listen(sockfd, 100) == -1 ){
        return ERROR;
    }
    return 1;
}

int main()
{
    WSADATA wsaData;

        if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
            printf ("Error initialising WSA.\n");
            return -1;
        }
    int sockfd; // server's listening socket's descriptor id
    int port = 4997;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    while ( sockfd < 0 ){ // ERROR
        printf("Listener socket creation failed with:%d, errno is %d\n",sockfd,errno);fflush(NULL);
        sockfd = socket(AF_INET, SOCK_STREAM, 0);
    }
    if ( socketBind(sockfd, port) == ERROR ){
        printf("Socket bind failed with errno=%d\n",errno);fflush(NULL);
        close(sockfd);
        return ERROR;
    }
    printf("Starting to listen to other USERS!\n");fflush(NULL);
    struct sockaddr_in cli_addr;
    int clilen = sizeof(cli_addr); // length of address
    // accept() returns the socket that will be used for Control Connection with the accepted client
    printf("*************Waiting for other USERS************\n");fflush(NULL);
    int newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
    int readLength;
    char command[(128+1)];
    while(1)
    {
        ZeroMemory(command, sizeof(command));
        readLength = read(newsockfd, command, 128+1);
        if(readLength <= 0)
        {
            continue;
        }
        if(readLength > 0)
        {
            printf(" here should be API's func to command %s", command);fflush(NULL);
        }
        else
        {
            close(sockfd);
            close(newsockfd);
            WSACleanup();
            printf("Read failed with errno:%d\n",errno);fflush(NULL);
            return ERROR;
        }
    }
    close(sockfd);
    close(newsockfd);
    WSACleanup();
    return 1;
}

client.c：

#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>
#include <tchar.h>

int verifyWrite(int sockfd, char* command){
    int size = strlen(command);
    int i=0, x=0;
    for(i=0;i<size;){
        x = write(sockfd, command, size);
        if(x < 0){
            return ERROR;
        }
        if(x >= 0) {
            i += x;
        }
    }
    return 0;
}

int sendToAll(char* message, int sockfd)
{
    if ( verifyWrite(sockfd, message) < 0 )
    {
        printf("error while sending message\n");fflush(NULL);
    }
    return 0;
}

int main()
{
    WSADATA wsaData;

        if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR) {
            printf ("Error initialising WSA.\n");
            return -1;
        }
    int port,sockfd;
    struct sockaddr_in serv_addr;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);       //creating control connection
    while(sockfd < 0){
        printf("error - sockfd = %d\n",sockfd);fflush(NULL);
        sockfd = socket(AF_INET, SOCK_STREAM, 0);
    }
    port = 4997;
    ZeroMemory((char*)&serv_addr, sizeof(serv_addr));
    serv_addr.sin_addr.s_addr = inet_addr("192.168.1.20");
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(port);
    while(connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr)) < 0){
        printf("error - connect failed. sockfd is %d, errno is %d, WSA is %d\n",sockfd,errno,WSAGetLastError());fflush(NULL);
    }
    printf("\n opened connection to %s\n", "192.168.1.20");fflush(NULL);

    int i = 0;
    while(i< 6)
    {
        sendToAll("just a message", sockfd);
        i++;
    }
    WSACleanup();

    return 0;
}

Answer 1

您的服務器正在偵聽端口4997，但您的客戶端連接到端口80來代替。 你本來是可以趕上，如果你已經包括了聽力和連接IP：在你的調試輸出到控制台端口對。