Function ACLGetUserCommandBit

app/redis-6.2.6/src/acl.c:379–383

Check if the specified command bit is set for the specified user. * The function returns 1 is the bit is set or 0 if it is not. * Note that this function does not check the ALLCOMMANDS flag of the user * but just the lowlevel bitmask. * * If the bit overflows the user internal representation, zero is returned * in order to disallow the execution of the command in such edge case. */

 * If the bit overflows the user internal representation, zero is returned
 * in order to disallow the execution of the command in such edge case. */
int ACLGetUserCommandBit(user *u, unsigned long id) {
    uint64_t word, bit;
    if (ACLGetCommandBitCoordinates(id,&word,&bit) == C_ERR) return 0;
    return (u->allowed_commands[word] & bit) != 0;
}

/* When +@all or allcommands is given, we set a reserved bit as well that we
 * can later test, to see if the user has the right to execute "future commands",