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linux系统UDP的socket通信编程3

2024-08-27 01:17:22   216人阅读

我刚开始接触linux下的socket编程，边抄边理解udp socket编程，我的疑问是server不指定IP地址，client的目标IP地址是127.0.0.1，这样就可以通信吗？在同一主机下是不是不能测试？如果server默认绑定本机的IP 地址，那么开启server后，在浏览器中输入127.0.0.1:(相应端口) 也可以得到数据？我的程序如下，没有跑起来，其实我觉得我不会测试，不知道本质所以会有细节漏掉。（使用的系统是ubuntu 11.10 ，编译器GCC ，分别在同一主机下的两个终端中运行生成的.out文件。）提前感谢大家的回答，不管多少，您的回答让一个初学者非常暖心～～

服务器程序

 

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#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
 
#define lport 4567
 
int main()
{
    int mysock,len;
    struct sockaddr_in addr;
    int i=0;
    char msg[256];
 
    int addr_len;
 
    if((mysock=socket(AF_INET,SOCK_DGRAM,0))<0)
    {
        perror("error");
        exit(1);
    }
    else
    {
        printf("socket created.\n");
        printf("socket ID: %d\n",mysock);
    }
    addr_len=sizeof(struct sockaddr_in);
    bzero(&addr,sizeof(addr));
    addr.sin_family=AF_INET;
    addr.sin_port=htons(lport);
    addr.sin_addr.s_addr=htonl(INADDR_ANY);
 
    if(bind(mysock,&addr,sizeof(addr))<0)
    {
        perror("connect");
        exit(1);
    }
    else
    {
        printf("bind ok.\n");
        printf("local port: %d\n",lport);
    }
    while(1)
    {
        bzero(msg,sizeof(msg));
        len=recvfrom (mysock,msg,sizeof(msg),0,&addr,&addr_len);
 
        printf("%d: ",i);
        i++;
        printf("message form: %s\n",inet_ntoa(addr.sin_addr));
        printf("message: %s\n\n",msg);
        sendto(mysock,msg,len,0,&addr,addr_len);
    }
    return 0;
}

 

客户机程序：

 

 

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#include<stdio.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<unistd.h>
#include<fcntl.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<sys/socket.h>
 
#define rport 4567
#define rip "127.0.0.1"
 
int main()
{
    int s,len;
    struct sockaddr_in addr;
    int addr_len;
    char msg[256];
    int i=0;
 
    if((s=socket(AF_INET,SOCK_DGRAM,0))<0)
    {
        perror("error");
        exit(1);
    }
    else
    {
        printf("socket created.\n");
        printf("socket id: %d\n",s);
        printf("romote ip: %s\n",rip);
        printf("remote port: %d\n",rport);
    }
 
    len=sizeof(struct sockaddr_in);
    bzero(&addr,sizeof(addr));
    addr.sin_family=AF_INET;
    addr.sin_port=htons(rport);
    addr.sin_addr.s_addr=inet_addr(rip);
 
    while(1)
    {
        bzero(msg,sizeof(msg));
        len=read(STDIN_FILENO,msg,sizeof(msg));
        sendto(s,msg,len,0,&addr,addr_len);
        printf("\nInput message: %s\n",msg);
        len=recvfrom(s,msg,sizeof(msg),0,&addr,&addr_len);
 
        printf("%d :",i);
        i++;
        printf("received message: %s \n",msg);
    }
    return 0;
}

linux系统UDP的socket通信编程3


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