ssh opening

// Client
int fd = connect(...);
char buffer[100];
read(fd, buffer, sizeof(buffer));

int major, minor;
char impl[100];
if (sscanf(buffer, "SSH-%d.%d-%99s", &major, &minor, impl) != 3 ||
    !(major == MY_MAJOR_VERSION && minor == MY_MINOR_VERSION))
{
    write(fd, "Protocol mismatch.\n", 20);
    close(fd);
    abortTheShip();
}
// negotiate encryption settings

// Server
int fd = accept(...);
char buffer[100];
read(fd, buffer, sizeof(buffer));

int major, minor;
char impl[100];
if (sscanf(buffer, "SSH-%d.%d-%99s", &major, &minor, impl) != 3 ||
    !(major == MY_MAJOR_VERSION && minor == MY_MINOR_VERSION))
{
    write(fd, "Protocol mismatch.\n", 20);
    close(fd);
    abortTheShip();
}
// negotiate encryption settings