exploit1.c

void handle(int newsock) {

    int backdoor = 0;

       char buffer[1016];

    memset(buffer, 0, 1016);

    send(newsock, "Welcome to CSAW CTF.", 21, 0);

    recv(newsock, buffer, 1020, 0);

    buffer[1015] = 0;

    if ( backdoor ) {

        fd = fopen("./key", "r");

        fscanf(fd, "%s\n", buffer);

        send(newsock, buffer, 512, 0);

    }

    close(newsock);

csaw2013-exploitation 100 code snippet