下载模型
上传模型
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <time.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
#include <signal.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <errno.h>
#define LOG(s) printf("[%s] {%s:%d} %s \n", __DATE__, __FILE__, __LINE__, s);
int do_download(int client, struct sockaddr_in remote)
{
//组下载请求包
char buf[516] = {
0};
char filename[30] = "";
puts("请输入要下载的文件名>>>>");
scanf("%s", filename);
while(getchar() != 10);
//操作码
unsigned short* cmd = (unsigned short*)buf;
*cmd = htons(1);
//文件名
char* f_n = buf + 2;
strcpy(f_n, filename);
//模式
char* mode = f_n + 1 + strlen(f_n);
strcpy(mode, "octet");
//请求长度
int size = strlen(mode) + strlen(f_n) + 4;
//发送下载请求 sendto
socklen_t len = sizeof(remote);
if(sendto(client, buf, size, 0, (struct sockaddr*)&remote, len) == -1)
{
LOG("sendto error");
return -1;
}
int res = 0;
unsigned short num = 0;
int fd_w = -1;
while(1)
{
//接受数据
bzero(buf, sizeof(buf));
if((res = recvfrom(client, buf, sizeof(buf), 0, (struct sockaddr*)&remote, &len)) == -1)
{
LOG("recvfrom error");
return -1;
}
//数据包接收
if(3 == buf[1])
{
num++;
//判断块编号是否合法
if(*(unsigned short*)(buf+2) == htons(num))
{
//第一个数据包则创建文件
if(1 == num)
{
if((fd_w = open("./5.png", O_WRONLY | O_CREAT | O_TRUNC, 0664)) == -1)
{
LOG("open error");
return -1;
}
}
if(write(fd_w, buf+4, res-4) == -1)
{
LOG("write error");
return -1;
}
}
//组ACK
*cmd = htons(4);
//发送ACK
if(sendto(client, buf, sizeof(int), 0, (struct sockaddr*)&remote, len) == -1)
{
LOG("sendto error");
return -1;
}
//判断数据是否小于512字节，小于则下载完成
if(res - 4 < 512)
{
puts("下载完成");
break;
}
}
//错误码信息判断
if(5 == buf[1])
{
fprintf(stderr, "错误码：%d，错误信息：%s\n", ntohs(*(unsigned short*)(buf+2)), buf+4);
break;
}
}
close(fd_w);
return 0;
}
int do_upload(int client, struct sockaddr_in remote)
{
//组写请求数据包
char buf[516] = {
0};
char filename[30] = "";
puts("请输入要上传的文件名称>>>>");
scanf("%s", filename);
while(getchar() != 10);
//操作码
unsigned short* cmd = (unsigned short*)buf;
*cmd = htons(2);
//文件名
char* f_n = buf + 2;
strcpy(f_n, filename);
//模式
char* mode = f_n + 1 + strlen(f_n);
strcpy(mode, "octet");
//请求长度
int size = strlen(mode) + strlen(f_n) + 4;
//发送下载请求 sendto
socklen_t len = sizeof(remote);
if(sendto(client, buf, size, 0, (struct sockaddr*)&remote, len) == -1)
{
LOG("sendto error");
return -1;
}
int res = 0;//记录读文件的长度
unsigned short num = 0;//记录块编码
int fd_r = -1;//定义读文件描述符
bzero(buf, sizeof(buf));
//接收数据
if((res = recvfrom(client, buf, sizeof(buf), 0, (struct sockaddr*)&remote, &len) == -1))
{
LOG("recvfrom error");
return -1;
}
//判断是否为第0号ACK应答包
if(buf[1] != 4 || *(unsigned short*)(buf+2) != htons(num))
{
puts("ACK包非法");
return -1;
}
puts("服务器连接成功，正在上传。。。");
//打开文件
if((fd_r = open("./sly.jpg", O_RDONLY)) == -1)
{
LOG("open error");
return -1;
}
while(1)
{
//判断ACK应答顺序是否合法
if(buf[1] != 4 || *(unsigned short*)(buf+2) != htons(num))
{
puts("ACK包非法");
return -1;
}
//数据包块编号自增
num++;
bzero(buf, sizeof(buf));
//读文件
if((res = read(fd_r, buf+4, 512)) == -1)
{
LOG("read error");
return -1;
}
//给数据包的操作数和块编码赋值
*cmd = htons(3);
*(unsigned short*)(buf+2) = htons(num);
//计算数据包长度
size = res + 4;
//发送数据包
if(sendto(client, buf, size, 0, (struct sockaddr*)&remote, len) == -1)
{
LOG("sendto error");
return -1;
}
//接收ACK应答包
bzero(buf, sizeof(buf));
if(recvfrom(client, buf, sizeof(buf), 0, (struct sockaddr*)&remote, &len) == -1)
{
LOG("recvfrom error");
return -1;
}
//文件结束标志
if(res < 512)
{
puts("上传成功");
break;
}
//错误码信息判断
if(5 == buf[1])
{
fprintf(stderr, "错误码：%d，错误信息：%s\n", ntohs(*(unsigned short*)(buf+2)), buf+4);
break;
}
}
close(fd_r);
return 0;
}
int main(int argc, char *argv[])
{
//创建套接字
int client = 0;
if((client = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
LOG("socket error");
return -1;
}
//地址信息结构体赋值
struct sockaddr_in remote = {
0};
remote.sin_family = AF_INET;
remote.sin_port = htons(69);
remote.sin_addr.s_addr = inet_addr("192.168.114.227");
char choose = 0;
while(1)
{
system("clear");
printf("-----------------------\n");
printf("---------1. 下载-------\n");
printf("---------2. 上传-------\n");
printf("---------3. 退出-------\n");
printf("-----------------------\n");
printf("请输入>>>>");
scanf("%c", &choose);
while(getchar() != 10);
switch(choose)
{
case '1':
do_download(client, remote);
break;
case '2':
do_upload(client, remote);
break;
case '3':
goto END;
break;
default:
puts("输入有误，重新输入");
break;
}
puts("输入任意字符清屏>>>");
while(getchar() != 10);
}
END:
//关闭文件描述符
close(client);
return 0;
}