2021.7.16快乐实验
PuTTy
嫖到了高中同学的服务器,用PuTTy去连
- 参数举例说明如下：
- Host Name（or IP address）：公网 IP
- Port：轻量应用服务器的连接端口，必须设置为22
- Connect type：选择 “SSH”
- Saved Sessions：填写会话名称，例如 test
配置 “Host Name” 后，再配置 “Saved Sessions” 并保存，则后续使用时您可直接双击 “Saved Sessions” 下保存的会话名称即可登录服务器
- 单击【Open】，进入 “PuTTY” 的运行界面
运行C/C++
安装c/c++环境（gcc）
yum install gcc
yum install gcc-c++ libstdc++-devel
或者
sudo apt-get install gcc
安装完成后可以使用gcc -v来查看编译器版本信息等。
编译C文件:
gcc xxx.c
直接这样会发现出来的是默认的a.out
可以加上-o来定义输出文件
gcc xxx.c -o xxx
使用
./xxx
来执行
要注意需要拥有x(执行)权限才行(我是root所以就默认了)
C++编译时将gcc改成g++即可
新建用户并上传图片
useradd littleblue
su - littblue
打开winscp,使用littleblue账号链接主机
cd /home/littleblue
mkdir setu
在setu里新建Saber文件夹并上传了一个.zip压缩包
发现账号无法进入Saber,利用ls -al查看,发现
drwx------ 2 root root 4096 Jul 16 14:09 Saber
只有root拥有完全权限,改成root权限
使用chmod 777 -R setu 更改权限
并且使用chown littleblue setu/ 更改拥有者
现在好了,littleblue也可以查看了
drwxrwxrwx 5 littleblue littleblue 4096 Jul 16 14:09 setu
想办法解压
unzip zipped_file.zip
错了,现在图片全解压到文件夹里了,删除一下
shopt -s extglob
rm -rf !(*.java|*.tar.gz)
例如：删除当前目录下除了.tar.gz和.java结尾的其他文件或文件夹
重来
unzip zipped_file.zip -d unzipped_directory
ok
通话
cli.c
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <fcntl.h>
int exit_flag;
void *threadsend(void *vargp);
void *threadrecv(void *vargp);
int main(int argc, char **argv)
{
if(argc !=3)
{
printf("start e.g: ./cli 192.168.5.128 9001\n");
return -1;
}
//printf("argc %d argv[1]: %s argv[2]: %s\n", argc, argv[1], argv[2]);
exit_flag = 1;
int clientfdp;
clientfdp = socket(AF_INET,SOCK_STREAM,0);
// int flags = fcntl(clientfdp, F_GETFL, 0);
// fcntl(clientfdp, F_SETFL, flags | O_NONBLOCK);
struct sockaddr_in serveraddr;struct hostent *hp;
bzero((char *)&serveraddr,sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(atoi(argv[2]));
serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
if(connect(clientfdp,(struct sockaddr *)&serveraddr,sizeof(serveraddr)) < 0)
{
printf("Connect error\n");
exit(-1);
}
pthread_t tid1,tid2;
printf("Connect server success.\n");
pthread_create(&tid1,NULL,threadsend,&clientfdp);
pthread_create(&tid2,NULL,threadrecv,&clientfdp);
if(tid1 !=0)
{
pthread_join(tid1,NULL);
printf("threadsend pthread_join completed\n");
}
if(tid2 !=0)
{
pthread_join(tid2, NULL);
printf("threadrecv pthread_join completed\n");
}
close(clientfdp);
printf("client close\n");
return EXIT_SUCCESS;
}
void *threadsend(void * vargp)
{
int connfd = *((int *)vargp);
int idata;char temp[100];
while(exit_flag)
{
memset(temp, 0, sizeof(temp));
fgets(temp,100,stdin);
if(strlen(temp) > 0)
{
send(connfd,temp,100,0);
printf(" message send OK\n");
}
usleep(500);
if(memcmp(temp, "exit", 4) == 0)
{
exit_flag = 0; break;
}
}
printf("client send over and exit \n");
pthread_exit(0);
}
void *threadrecv(void *vargp)
{
char temp[100];
int connfd = *((int *)vargp);
while(exit_flag)
{
int idata = 0;
if(!exit_flag) break;
idata = recv(connfd,temp,100,0);
if(idata > 0)
{
printf("Message from server :%s\n", temp);
}
usleep(500);
}
printf("client threadrecv over and exit \n");
pthread_exit(0);
}
svr.c
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <fcntl.h>
#define maxsec 20
typedef struct clieninfo
{
int connfdp;
signed char padress[20];
} clieninfoT;
void *createthread(void *vargp);
void *threadsend(void *vargp);
void *threadrecv(void *vargp);
int exit_flag;
int main(int argc, char **argv)
{
if(argc !=2)
{
printf("start e.g: ./svr 9001\n");
return -1;
}
// printf("argc %d argv[1]: %s \n", argc, argv[1]);
exit_flag = 1;
int listenfd = socket(AF_INET, SOCK_STREAM,0);
if(listenfd < 0)
{
perror("socket err\n");
exit(-1);
}
int flags = fcntl(listenfd, F_GETFL, 0);
fcntl(listenfd, F_SETFL, flags | O_NONBLOCK);
struct hostent *hp;
struct sockaddr_in serveraddr;
bzero((char *)&serveraddr,sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
serveraddr.sin_port = htons(atoi(argv[1]));
if(bind(listenfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr)) < 0)
{
perror("connect error\n");
exit(-1);
}
if(listen(listenfd,10) < 0)
{
perror("listen error");
exit(-1);
}
printf("Server started... \n");
struct sockaddr_in clientaddr;
int clientlen, i;
pthread_t sectid[maxsec];
memset(§id, 0, maxsec * sizeof(pthread_t));
i = 0;
clieninfoT Pclient;
memset(&Pclient, 0, sizeof(clieninfoT));
clientlen = sizeof(clientaddr);
while(exit_flag)
{
Pclient.connfdp = accept(listenfd,(struct sockaddr *)&clientaddr, &clientlen);
if (Pclient.connfdp == -1 && errno == EAGAIN)
{
// fprintf(stderr, "no client connections yet\n");
usleep(100);
continue;
}
memcpy(Pclient.padress, inet_ntoa(clientaddr.sin_addr ), 20);
printf("Pclient.padress %s\n", Pclient.padress);
printf("Accepted client [ip:%s port:%d]\n",inet_ntoa(clientaddr.sin_addr), htons(clientaddr.sin_port));
pthread_create(§id[i],NULL,createthread,&Pclient);
usleep(500);
}
int m = 0;
for( m = 0; m < maxsec; m++)
{
if(sectid[m] !=0)
{
printf("sectid pthread_join .....\n");
pthread_join(sectid[m], NULL);
printf("sectid pthread_join completed\n");
}
}
EXIT_SUCCESS;
}
void *createthread(void *vargp)
{
pthread_t tid1,tid2;
pthread_create(&tid1,NULL,threadsend,vargp);
pthread_create(&tid2,NULL,threadrecv,vargp);
if(tid1 !=0)
{
pthread_join(tid1,NULL);
printf("server threadsend pthread_join completed\n");
}
if(tid2 !=0)
{
pthread_join(tid2, NULL);
printf("server threadrecv pthread_join completed\n");
}
printf("server createthread over \n");
pthread_exit(0);
}
void *threadsend(void * vargp)
{
int connfd = ((clieninfoT *)vargp)->connfdp;
int idata;
signed char temp[100];
while(exit_flag)
{
memset(temp, 0, sizeof(temp));
fgets(temp, 100, stdin);
if(strlen(temp) > 0)
{
send(connfd, temp, 100, 0);
printf(" msg send OK\n");
}
usleep(500);
if(memcmp(temp, "exit", 4) == 0)
{
exit_flag = 0; break;
}
}
printf("server send over and exit \n");
pthread_exit(0);
}
void *threadrecv(void *vargp)
{
char temp[100];
int connfd = ((clieninfoT *)vargp)->connfdp;
while(exit_flag)
{
memset(temp, 0, sizeof(temp));
int idata = 0;
if(!exit_flag) break;
idata = recv(connfd,temp,100,0);
if(idata > 0)
{
printf("client[%s] message: %s\n", ((clieninfoT *)vargp)->padress, temp);
}
usleep(500);
}
printf("server threadrecv over and exit \n");
pthread_exit(0);
}
ifconfig查看主机ip
运行cli 参数主机ip 1001
./cli 192.168.1.20 1001
For the LichKing !
