C Examples

WAP in C to Develop A Program to Block USB!

The Program in C to Develop A Program to Block USB is given below:

#include <windows.h>

int main() {
    DWORD drives = GetLogicalDrives();
    int i;
    for (i = 0; i < 26; i++) {
        if (drives & (1 << i)) {
            char drive[] = "A:\\";
            drive[0] = 'A' + i;
            DWORD type = GetDriveTypeA(drive);
            if (type == DRIVE_REMOVABLE) {
                char volumeName[MAX_PATH + 1] = {0};
                DWORD serialNumber = 0;
                DWORD maxComponentLen = 0;
                DWORD fileSystemFlags = 0;
                char fileSystemNameBuffer[MAX_PATH + 1] = {0};
                if (GetVolumeInformationA(drive, volumeName, sizeof(volumeName), &serialNumber, &maxComponentLen, &fileSystemFlags, fileSystemNameBuffer, sizeof(fileSystemNameBuffer))) {
                    if (strcmp(fileSystemNameBuffer, "FAT") == 0 || strcmp(fileSystemNameBuffer, "FAT32") == 0) {
                        char blockCommand[MAX_PATH + 50] = {0};
                        sprintf(blockCommand, "fsutil.exe behavior set disablelastaccess 1 %s", drive);
                        system(blockCommand);
                    }
                }
            }
        }
    }
    return 0;
}

Pro-Tips💡

This code uses the GetLogicalDrives function to get a bitmask representing the currently available drives,

and then loops through each possible drive letter (A-Z). For each drive, it uses the GetDriveTypeA function to check if the drive is removable (i.e. a USB drive),

and if so, it uses the GetVolumeInformationA function to check if the drive uses the FAT or FAT32 file system.

If it does, the code uses the sprintf function to construct a command string to run the fsutil.exe utility with the behavior set disablelastaccess 1 option,

which can be used to block a USB drive. Finally, it uses the system function to run the command.

Please note that this code is just a sample, it may require some modifications depending on your specific requirements.

Also note that this code will block all the USB drives that are plugged in while the program is running and uses the FAT or FAT32 file system.

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