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

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#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 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

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#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 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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