Find a solution of optimal problem with an inequality constraint

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Let $a,b,x$ be vectors in $R^n$, A be a matrix, $c,d \in R, c<d$. Solve the following problem:
$$\begin{cases} \text{minimize} \quad (b-Ax)^T(b-Ax)\\ (a^Tx-c).(a^Tx-d) \leq 0 \end{cases}$$ Assume that $A,a,b$ are good enough for my problem. How can I solve it ? Thanks.