This code tests the ability to add up 4 unsigned 32-bit integers. Hint: Keep in mind that it wraps.
This level is at /opt/protostar/bin/net2
#include "../common/common.c"
#define NAME "net2"
#define UID 997
#define GID 997
#define PORT 2997
void run()
{
unsigned int quad[4];
int i;
unsigned int result, wanted;
result = 0;
for(i = 0; i < 4; i++) {
quad[i] = random();
result += quad[i];
if(write(0, &(quad[i]), sizeof(result)) != sizeof(result)) {
errx(1, ":(\n");
}
}
if(read(0, &wanted, sizeof(result)) != sizeof(result)) {
errx(1, ":<\n");
}
if(result == wanted) {
printf("you added them correctly\n");
} else {
printf("sorry, try again. invalid\n");
}
}
int main(int argc, char **argv, char **envp)
{
int fd;
char *username;
/* Run the process as a daemon */
background_process(NAME, UID, GID);
/* Wait for socket activity and return */
fd = serve_forever(PORT);
/* Set the client socket to STDIN, STDOUT, and STDERR */
set_io(fd);
/* Don't do this :> */
srandom(time(NULL));
run();
}