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Linux下的socket文件传输

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server.c

////////////////////////////////////
//服务器代码
///////////////////////////////////
//本文件是服务器的代码
#include <netinet/in.h>    // for sockaddr_in
#include <sys/types.h>    // for socket

#include <sys/socket.h>    // for socket
#include <stdio.h>        // for printf
#include <stdlib.h>        // for exit
#include <string.h>        // for bzero
#include <time.h>                //for time_t and time

#define HELLO_WORLD_SERVER_PORT 7754
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024

int main(int argc, char **argv)
{
    //设置一个socket地址结构server_addr,代表服务器internet地址, 端口
    struct sockaddr_in server_addr;
    bzero(&server_addr,sizeof(server_addr)); //把一段内存区的内容全部设置为0
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htons(INADDR_ANY);
    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
    // time_t now;
    FILE *stream;

    //创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
    int server_socket = socket(AF_INET,SOCK_STREAM,0);
    if( server_socket < 0)
    {
        printf("Create Socket Failed!");
        exit(1);
    }

    //把socket和socket地址结构联系起来
    if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
    {
        printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT);
        exit(1);
    }

    //server_socket用于监听
    if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
    {
        printf("Server Listen Failed!");
        exit(1);
    }

    while (1) //服务器端要一直运行
    {

        struct sockaddr_in client_addr;
        socklen_t length = sizeof(client_addr);

        int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
        if ( new_server_socket < 0)
        {
            printf("Server Accept Failed!\n");
            break;
        }

        char buffer[BUFFER_SIZE];
        bzero(buffer, BUFFER_SIZE);

        strcpy(buffer,"Hello,World! 从服务器来!");
        strcat(buffer,"\n"); //C语言字符串连接

        send(new_server_socket,buffer,BUFFER_SIZE,0);

        bzero(buffer,BUFFER_SIZE);
        //接收客户端发送来的信息到buffer中
        length = recv(new_server_socket,buffer,BUFFER_SIZE,0);

        if (length < 0)
        {
            printf("Server Recieve Data Failed!\n");
            exit(1);
        }
        printf("\n%s",buffer);

        if((stream = fopen("data1","r"))==NULL)
        {
            printf("The file 'data1' was not opened! \n");
            exit(1);
        }
        else

            printf("The file 'filename' was opened! \n");
        bzero(buffer,BUFFER_SIZE);

        int lengsize = 0;
        while((lengsize = fread(buffer,1,1024,stream)) > 0)
        {

            printf("lengsize = %d\n",lengsize);

            if(send(new_server_socket,buffer,lengsize,0)<0)
            {
                printf("Send File is Failed\n");
                break;
            }

            bzero(buffer, BUFFER_SIZE);

        }
        if(fclose(stream))
            printf("The file 'data' was not closed! \n");
        exit(1);       

        //关闭与客户端的连接
        close(new_server_socket);        
    }
    //关闭监听用的socket
    close(server_socket);
    return 0;
}

client.c

////////////////////////////////////
//客户端代码
///////////////////////////////////

//本文件是客户机的代码
#include <netinet/in.h>    // for sockaddr_in
#include <sys/types.h>    // for socket
#include <sys/socket.h>    // for socket
#include <stdio.h>        // for printf
#include <stdlib.h>        // for exit
#include <string.h>        // for bzero
#include <time.h>                //for time_t and time
#include <arpa/inet.h>

#define HELLO_WORLD_SERVER_PORT    7754
#define BUFFER_SIZE 1024

int main(int argc, char **argv)
{
    if (argc != 2)
    {
        printf("Usage: ./%s ServerIPAddress\n",argv[0]);
        exit(1);
    }

    //time_t now;
    FILE *stream;

    //设置一个socket地址结构client_addr,代表客户机internet地址, 端口
    struct sockaddr_in client_addr;
    bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0
    client_addr.sin_family = AF_INET;    //internet协议族
    client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址
    client_addr.sin_port = htons(0);    //0表示让系统自动分配一个空闲端口
    //创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
    int client_socket = socket(AF_INET,SOCK_STREAM,0);
    if( client_socket < 0)
    {
        printf("Create Socket Failed!\n");
        exit(1);
    }
    //把客户机的socket和客户机的socket地址结构联系起来
    if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
    {
        printf("Client Bind Port Failed!\n");
        exit(1);
    }

    //设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
    struct sockaddr_in server_addr;
    bzero(&server_addr,sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
    {
        printf("Server IP Address Error!\n");
        exit(1);
    }
    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
    socklen_t server_addr_length = sizeof(server_addr);
    //向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接
    if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
    {
        printf("Can Not Connect To %s!\n",argv[1]);
        exit(1);
    }

    char buffer[BUFFER_SIZE];
    bzero(buffer,BUFFER_SIZE);

    //从服务器接收数据到buffer中
    int length = recv(client_socket,buffer,BUFFER_SIZE,0);

    if(length < 0)
    {
        printf("Recieve Data From Server %s Failed!\n", argv[1]);
        exit(1);
    }

    printf("\n%s\n",buffer);

    bzero(buffer,BUFFER_SIZE);

    bzero(buffer,BUFFER_SIZE);
    strcpy(buffer,"Hello, World! From Client\n");
    //向服务器发送buffer中的数据
    send(client_socket,buffer,BUFFER_SIZE,0);

    if((stream = fopen("data","w+t"))==NULL)
    {
        printf("The file 'data' was not opened! \n");
    }

    else
        bzero(buffer,BUFFER_SIZE);
    length = 0;
    while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
    {
        if(length < 0)
        {
            printf("Recieve Data From Server %s Failed!\n", argv[1]);
            break;
        }

        int write_length = fwrite(buffer,sizeof(char),length,stream);
        if (write_length<length)
        {
            printf("File is Write Failed\n");
            break;
        }
        bzero(buffer,BUFFER_SIZE);  
    }
    printf("Recieve File From Server[%s] Finished\n", argv[1]);

    //关闭 文件
    fclose(stream);

    //关闭socket
    close(client_socket);
    return 0;
}

标签:c,socket,linux

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