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 <server IP> <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 <stdio.h>#include <string.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#define    MAXLINE        1024void 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 <stdio.h>#include <string.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <fcntl.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#define    MAXLINE        1024void 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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