Linux网络编程之使用TCP传输文件

原创作品，转载时请务必以超链接形式标明文章原始出处:http://blog.csdn.net/gqb666/article/details/8976263,作者:gqb666

         最近在写Linux网络方面的demo,用TCP实现了一个简单的传输文件程序，适用于网卡设备及TCP/IP协议栈及网络环境测试时使用。用法容易，代码简洁，已经测试成功。其功能是使用TCP协议从client端向server端传输文件，用法如下:

     编译：

           client:gcc -o client client.c

           server:gcc -o server server.c

     运行：

           client端：./client <端口号> <上传文件名>

           server端：./server <端口号> <保存为文件名>

其中，server端先运行，client端与server端的端口号必须一致并且不能与已知端口冲突（例如8888即可）

下面将代码贴上：（使用UDP传输文件请参阅博文Linux网络编程之使用UDP传输文件）

server端代码:server.c

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define    MAXLINE        1024

void usage(char *command)
{
    printf("usage :%s portnum filename\n", command);
    exit(0);
}
int main(int argc,char **argv) 
{
    struct sockaddr_in     serv_addr;
    struct sockaddr_in     clie_addr;
    char                   buf[MAXLINE];
    int                    sock_id;
    int                    link_id;
    int                    recv_len;
    int                    write_leng;
    int                    clie_addr_len;
    FILE                   *fp;

    if (argc != 3) {
        usage(argv[0]);
    }
    if ((fp = fopen(argv[2], "w")) == NULL) {
        perror("Open file failed\n");
        exit(0);
    }
    if ((sock_id = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("Create socket failed\n");
        exit(0);
    }
    /*fill the server sockaddr_in struct commented by guoqingbo*/
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(atoi(argv[1]));
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    if (bind(sock_id, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 ) {
        perror("Bind socket failed\n");
        exit(0);
    }

    if (-1 == listen(sock_id, 10)) {
        perror("Listen socket failed\n");
        exit(0);
    }
    /* server part commented by guoqingbo*/
    while (1) {
        clie_addr_len = sizeof(clie_addr);
        link_id = accept(sock_id, (struct sockaddr *)&clie_addr, &clie_addr_len);
        if (-1 == link_id) {
            perror("Accept socket failed\n");
            exit(0);
        }
        bzero(buf, MAXLINE);
        while (recv_len = recv(link_id, buf, MAXLINE, 0)) {
            /* receiver data part commented by guoqingbo*/
            if(recv_len < 0) {
                printf("Recieve Data From Server Failed!\n");
                break;
            }
            printf("#");
            write_leng = fwrite(buf, sizeof(char), recv_len, fp);
            if (write_leng < recv_len) {
                printf("Write file failed\n");
                break;
            }
            bzero(buf,MAXLINE);
        }
        printf("\nFinish Recieve\n");
        fclose(fp);
        close(link_id);
    }
    close(sock_id); 
    return 0;
}

client端代码:client.c

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define    MAXLINE        1024

void usage(char *command)
{
    printf("usage :%s ipaddr portnum filename\n", command);
    exit(0);
}
int main(int argc,char **argv)
{
    struct sockaddr_in     serv_addr;
    char                   buf[MAXLINE];
    int                    sock_id;
    int                    read_len;
    int                    send_len;
    FILE                   *fp;
    int                    i_ret;
   
    if (argc != 4) {
        usage(argv[0]);
    }
    
    /* open the file to be transported commented by guoqingbo*/
    if ((fp = fopen(argv[3],"r")) == NULL) {
        perror("Open file failed\n");
        exit(0);
    }
    
    /* create the socket commented by guoqingbo*/
    if ((sock_id = socket(AF_INET,SOCK_STREAM,0)) < 0) {
        perror("Create socket failed\n");
        exit(0);
    }
    
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(atoi(argv[2]));
    inet_pton(AF_INET, argv[1], &serv_addr.sin_addr);
   
    /* connect the server commented by guoqingbo*/
    i_ret = connect(sock_id, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr));
    if (-1 == i_ret) {
        printf("Connect socket failed\n");
       return -1;
    }
    
    /* transported the file commented by guoqingbo*/
    bzero(buf, MAXLINE);
    while ((read_len = fread(buf, sizeof(char), MAXLINE, fp)) >0 ) {
        send_len = send(sock_id, buf, read_len, 0);
        if ( send_len < 0 ) {
            perror("Send file failed\n");
            exit(0);
        }
        bzero(buf, MAXLINE);
    }

    fclose(fp);
    close(sock_id);
    printf("Send Finish\n");
    return 0;
}

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