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我正在尝试创建一个客户端服务器模型，该模型将在连接在同一接入点（家庭网络）上的不同机器上运行。客户端服务器模型在同一台机器上运行时完美运行，但在不同机器上运行时客户端请求超时。我的路由器防火墙被禁用，我试图关闭两台机器上的 Windows 防火墙，但客户端到服务器的连接仍然超时并且永远不会连接。代码很简单，我在上面给出

我的服务器代码如下

/* A simple server in the internet domain using TCP
    The port number is passed as an argument */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h> 
 #include <sys/socket.h>
 #include <netinet/in.h>

void error(const char *msg)
{
    perror(msg);
    exit(1);
 }

int main(int argc, char *argv[])
{
 int sockfd, newsockfd, portno;
 socklen_t clilen;
 char buffer[256];
 struct sockaddr_in serv_addr, cli_addr;
 int n;
 if (argc < 2) {
     fprintf(stderr,"ERROR, no port provided\n");
     exit(1);
 }
 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 if (sockfd < 0) 
    error("ERROR opening socket");
 bzero((char *) &serv_addr, sizeof(serv_addr));
 portno = atoi(argv[1]);
 serv_addr.sin_family = AF_INET;
 serv_addr.sin_addr.s_addr = INADDR_ANY;
 serv_addr.sin_port = htons(portno);
 if (bind(sockfd, (struct sockaddr *) &serv_addr,
          sizeof(serv_addr)) < 0) 
          error("ERROR on binding");
 listen(sockfd,5);
 clilen = sizeof(cli_addr);
 newsockfd = accept(sockfd, 
             (struct sockaddr *) &cli_addr, 
             &clilen);
 if (newsockfd < 0) 
      error("ERROR on accept");
 bzero(buffer,256);
 n = read(newsockfd,buffer,255);
 if (n < 0) error("ERROR reading from socket");
 printf("Here is the message: %s\n",buffer);
 n = write(newsockfd,"I got your message",18);
 if (n < 0) error("ERROR writing to socket");
 close(newsockfd);
 close(sockfd);
 return 0; 
}

执行编译

gcc server.c -o server

并运行

./server portnumber

我的客户代码如下

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 

void error(const char *msg)
{
perror(msg);
exit(0);
}

int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;

char buffer[256],ip[20];
if (argc < 3) {
   fprintf(stderr,"usage %s hostname port\n", argv[0]);
   exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) 
    error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
    fprintf(stderr,"ERROR, no such host\n");
    exit(0);
    }
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
strcpy (ip,argv[1]);
serv_addr.sin_addr.s_addr = inet_addr(ip);   
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0) 
    error("ERROR connecting");
printf("Please enter the message: ");
bzero(buffer,256);
fgets(buffer,255,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0) 
     error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0) 
     error("ERROR reading from socket");
printf("%s\n",buffer);
close(sockfd);
return 0;
}

编译和执行

gcc client.c -o client && ./client ipaddress portnumber

正如我所说，我的问题是在不同的机器上运行时。

像这样在一台机器上启动服务器

./server 55555

然后像这样在另一台机器上启动客户端

./client the_other_machines_ip_address 55555

例子./client 192.168.1.65 55555

和客户端显示消息连接超时。

正如我所说，我关闭了两台设备上的防火墙，并且我的路由器防火墙被禁用。谁能指出我出了什么问题。

PS：当我在同一台机器上运行客户端或服务器时，但在 VMware ubuntu 系统中运行它工作正常！

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0 回答 0