0313_网络编程作业

TCP

#include "head.h"
int main(int argc, const char *argv[])
{
    //创建套接字
    int sfd = socket(AF_INET,SOCK_STREAM,0);
    if(-1 == sfd)
    {
        ERR_MSG("socket");
        return -1;
    }
    //允许端口快速被复用
    int reuse = 1;
    if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0)
    {
        ERR_MSG("setsockopt");
        return -1;
    }
    //填充通用地址信息结构体
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(6789);
    sin.sin_addr.s_addr = inet_addr("192.168.31.69");
    //绑定服务器的ip和端口
    if(-1 == bind(sfd,(struct sockaddr*)&sin,sizeof(sin)))
    {
        ERR_MSG("bind");
        return -1;
    }
    //将套接字设置为被动监听状态
    if(-1 == listen(sfd,128))
    {
        ERR_MSG("listen");
        return -1;
    }
    //定义结构体存储获取到的客户端信息
    struct sockaddr_in cin;
    socklen_t addrlen = sizeof(cin);
    //获取连接成功后的套接字
    int newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
    if(-1 == newfd)
    {
        ERR_MSG("accept");
        return -1;
    }
    //消息收发
    char buf[128] = "";
    ssize_t res = 0;
    while(1)
    {
        //读取数据
        bzero(buf,sizeof(buf));
        res = recv(newfd,buf,sizeof(buf),0);
        if(-1 == res)
        {
            ERR_MSG("recv");
            return -1;
        }
        else if(0 == res)
        {
            printf("对端关闭\n");
            break;
        }
        printf("收到信息：%s\n",buf);
        //发送数据
        strcat(buf,"-wzx");
        if(-1 == send(newfd,buf,sizeof(buf),0))
        {
            ERR_MSG("send");
            return -1;
        }
    }
    close(sfd);
    close(newfd);
    return 0;
}

#include "head.h"
int main(int argc, const char *argv[])
{
    //创建套接字
    int cfd = socket(AF_INET,SOCK_STREAM,0);
    if(-1 == cfd)
    {
        ERR_MSG("socket");
        return -1;
    }
    //填充客户端的通用地址信息结构体
    struct sockaddr_in cin;
    cin.sin_family = AF_INET;
    cin.sin_port = htons(8888);
    cin.sin_addr.s_addr = inet_addr("192.168.31.69");
    socklen_t addrlen = sizeof(cin);
    //绑定客户端的ip和端口
    if(-1 == bind(cfd,(struct sockaddr*)&cin,addrlen))
    {
        ERR_MSG("bind");
        return -1;
    }
    //填充服务器的通用地址信息结构体
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(6789);
    sin.sin_addr.s_addr = inet_addr("192.168.31.69");
    addrlen = sizeof(sin);
    //连接服务器
    if(-1 == connect(cfd,(struct sockaddr*)&sin,addrlen))
    {
        ERR_MSG("connect");
        return -1;
    }
    //消息收发
    char buf[128] = "";
    ssize_t res = 0;
    while(1)
    {
        //发送数据
        bzero(buf,sizeof(buf));
        printf("请输入>>>");
        fgets(buf,sizeof(buf),stdin);
        buf[strlen(buf)-1] = '\0';
        res = send(cfd,buf,sizeof(buf),0);
        if(-1 == res)
        {
            ERR_MSG("send");
            return -1;
        }
        else if(0 == strcmp(buf,"quit"))
        {
            printf("客户端退出\n");
            break;
        }
        //接收数据
        bzero(buf,sizeof(buf));
        res = recv(cfd,buf,sizeof(buf),0);
        if(-1 == res)
        {
            ERR_MSG("recv");
            return -1;
        }
        else if(0 == res)
        {
            printf("对端关闭\n");
            break;
        }
        printf("收到应答：%s\n",buf);
    }
    close(cfd);
    return 0;
}

UDP

#include "head.h"
int main(int argc, const char *argv[])
{
    //创建套接字
    int sfd = socket(AF_INET,SOCK_DGRAM,0);
    if(-1 == sfd)
    {
        ERR_MSG("socket");
        return -1;
    }
    //填充通用地址信息结构体
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(8888);
    sin.sin_addr.s_addr = inet_addr("192.168.31.69");
    socklen_t addrlen = sizeof(sin);
    //绑定ip地址和端口号
    if(-1 == bind(sfd,(struct sockaddr*)&sin,addrlen))
    {
        ERR_MSG("bind");
        return -1;
    }
    //消息收发
    char buf[128] = "";
    ssize_t res = 0;
    struct sockaddr_in cin;
    addrlen = sizeof(cin);
    while(1)
    {
        //接收消息
        bzero(buf,sizeof(buf));
        res = recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
        if(-1 == res)
        {
            ERR_MSG("recvfrom");
            return -1;
        }
        else if(0 == res)
        {
            printf("对端关闭\n");
            break;
        }
        printf("收到信息：%s\n",buf);
        //发送消息
        strcat(buf,"-wzx");
        if(-1 == sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,addrlen))
        {
            ERR_MSG("sendto");
            return -1;
        }
    }
    close(sfd);
    return 0;
}

#include "head.h"
int main(int argc, const char *argv[])
{
    //创建套接字
    int cfd = socket(AF_INET,SOCK_DGRAM,0);
    if(-1 == cfd)
    {
        ERR_MSG("socket");
        return -1;
    }
    //填充通用地址信息结构体
    struct sockaddr_in cin;
    cin.sin_family = AF_INET;
    cin.sin_port = htons(6789);
    cin.sin_addr.s_addr = inet_addr("192.168.31.69");
    socklen_t addrlen = sizeof(cin);
    //绑定ip地址和端口号
    if(-1 == bind(cfd,(struct sockaddr*)&cin,addrlen))
    {
        ERR_MSG("bind");
        return -1;
    }
    //消息收发
    char buf[128] = "";
    ssize_t res = 0;
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(8888);
    sin.sin_addr.s_addr = inet_addr("192.168.31.69");
    addrlen = sizeof(sin);
    while(1)
    {
        //发送消息
        bzero(buf,sizeof(buf));
        fgets(buf,sizeof(buf),stdin);
        buf[strlen(buf)-1] = '\0';
        res = sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,addrlen);
        if(-1 == res)
        {
            ERR_MSG("sendto");
            return -1;
        }
        else if(strcmp(buf,"quit") == 0)
        {
            printf("客户端关闭\n");
            break;
        }
        //接收消息
        if(-1 == recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,&addrlen))
        {
            ERR_MSG("recvfrom");
            return -1;
        }
        printf("收到应答：%s\n",buf);
    }
    close(cfd);
    return 0;
}