我编写了以下代码作为连接两个程序的中间代码。在两个不同的系统上运行一个服务器程序和一个客户端程序。该代码有望充当这两个程序之间的中间体。
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
//Connect with program on server side
char * serv_con(char app_data[50])
{
int sock, bytes_recieved;
char send_data[1024];
char *recv_data = malloc(1024);
struct hostent *host;
struct sockaddr_in server_addr;
host = gethostbyname("10.47.3.249");
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("Socket");
exit(1);
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(3128);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(server_addr.sin_zero),8);
if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
{
perror("Connect");
exit(1);
}
bytes_recieved=recv(sock,recv_data,1024,0);
recv_data[bytes_recieved] = '\0';
send(sock, app_data, 50, 0);
return recv_data;
//close(sock);
}
//Connect with client app
char * cli_con(char ser_data[50])
{
int sock, connected, bytes_recieved , true = 1;
char send_data [1024];
char *recv_data = malloc(1024);
struct sockaddr_in server_addr,client_addr;
int sin_size;
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("Socket");
exit(1);
}
if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int)) == -1)
{
perror("Setsockopt");
exit(1);
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(5000);
server_addr.sin_addr.s_addr = INADDR_ANY;
bzero(&(server_addr.sin_zero),8);
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
{
perror("Unable to bind1");
exit(1);
}
if (listen(sock, 5) == -1)
{
perror("Listen");
exit(1);
}
sin_size = sizeof(struct sockaddr_in);
connected = accept(sock, (struct sockaddr *)&client_addr,&sin_size1);
printf("\n I got a connection from (%s , %d)",inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));
bytes_recieved = recv(connected,recv_data,1024,0);
recv_data[bytes_recieved] = '\0';
send(connected, ser_data,50, 0);
//close(sock);
}
int main()
{
char *ser_data, *app_data;
int pid = fork();
while(1)
{
if(pid == 0)
app_data = serv_con(ser_data);
else
ser_data = cli_con(app_data);
}
}
在客户端应用程序运行之前它工作正常。但是一旦客户端应用程序运行，代码就会退出并给出错误：
Unable to bind: Address already in use
I got a connection from (192.168.0.3 , 45691)
我应该在代码中进行哪些修改以纠正此错误？我正在研究Linux。提前致谢。
编辑：我已经从函数中删除了评论close(sock)并添加close(connect)了cli_con。客户端的代码如下：
int sock, bytes_recieved;
char send_data[1024],recv_data[1024];
struct hostent *host;
struct sockaddr_in server_addr;
host = gethostbyname("192.168.0.2");
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
perror("Socket");
exit(1);
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(5555);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
bzero(&(server_addr.sin_zero),8);
if (connect(sock, (struct sockaddr *)&server_addr,
sizeof(struct sockaddr)) == -1)
{
perror("Connect");
exit(1);
}
while(1)
{
//necessary codes
if (connect(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1)
{
close(sock);
goto connct;
}
}
但是现在运行时，第一个程序没有退出，甚至没有打印
I got a connection from (192.168.0.3 , 45691)
但只是继续运行而不打印任何消息。但另一方面，客户端退出并显示错误：
Connect: Connection reset by peer
我现在该怎么办？