服务器/客户端的分段错误在哪里？

如何解决服务器/客户端的分段错误在哪里？

已成功编译但未运行分段错误的 bcz

1. 客户端发送的数据是作为第二个客户端命令行参数提供的字符串。基本的 Echo 客户端打印 Echo 服务器发回的单串数据。基本 Echo 服务器的命令行和打印行的形式是： 编译： 服务器> gcc _EchoServer.c o _EchoServer 输出命令：Server> ./_EchoServer 服务器已启动...等待连接...

#include<stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{
    int servsocket,nBytes,i;
    char buf[1024];
    struct sockaddr_in serverAddr,clientAddr;
    servsocket=socket(PF_INET,SOCK_DGRAM,0);
    socklen_t addrsize,clientsize;

    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(atoi(argv[1]));
    serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);

    bind(servsocket,(struct sockaddr *) &serverAddr,sizeof(serverAddr));
    
    addrsize=sizeof(clientAddr);
    nBytes = recvfrom(servsocket,buf,1024,(struct sockaddr *)&clientAddr,&addrsize);
    printf("%s",buf);
    sendto(servsocket,strlen(buf)+1,addrsize);     
    close(servsocket);
    return 0;
}

编译： 客户端> gcc _EchoClient.c o _EchoClient 输出命令：Client> ./_EchoClient 172.31.132.x “echo this string!!” 从服务器接收：回显这个字符串！！ 172.31.132.x

//client side
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>
#include<netdb.h>

int main(int argc,char *argv[])
{
    
    int clsocket,nBytes;
    char buf[1024];
    struct sockaddr_in serverAddr;
    socklen_t addr_size;
        
    clsocket = socket(PF_INET,0);
    
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(atoi(argv[1]));
    serverAddr.sin_addr.s_addr =  inet_addr(argv[2]);
    
    int addrsize=sizeof(serverAddr);
    nBytes = strlen(argv[3]) + 1;
    sendto(clsocket,argv[3],(struct sockaddr *)&serverAddr,addrsize);
    recvfrom(clsocket,&addrsize);
    printf("From server %s\n",buf);
    close(clsocket);

}
        

解决方法

serverAddr.sin_port = htons(atoi(argv[1]));
serverAddr.sin_addr.s_addr =  inet_addr(argv[2]);

如果检查客户端传入的参数，argv[1] = 172.31.132.x 和 argv[2] = "echo the string!!";上面两行中的 Echo Client 代码都没有指定端口和 ip。

改为输入 -

serverAddr.sin_port = htons(8080); //taking a simple example of http server
serverAddr.sin_addr.s_addr =  inet_addr(argv[1]); //since argument 1 contains the IP address and not the second argument