Function ql_syscall_accept

qiling/os/posix/syscall/socket.py:590–662

(ql: Qiling, sockfd: int, addr: int, addrlenptr: int)

def ql_syscall_accept(ql: Qiling, sockfd: int, addr: int, addrlenptr: int):
    sock = get_opened_socket(ql.os, sockfd)

    if isinstance(sock, int):
        return sock

    try:
        conn, address = sock.accept()
    except ConnectionError:
        return -1

    if (conn is None) or (address is None):
        return -1

    idx = next((i for i in range(NR_OPEN) if ql.os.fd[i] is None), -1)

    if idx == -1:
        return -EMFILE

    ql.os.fd[idx] = conn

    if addr:
        addrlen = ql.mem.read_ptr(addrlenptr) if addrlenptr else 0

        abits = ql.arch.bits
        endian = ql.arch.endian

        obj = None

        if conn.family == AF_UNIX:
            hpath = address
            vpath = ql.os.path.host_to_virtual_path(hpath)

            if addrlen:
                # addrlen indicates the total obj size allowed to be written.
                # that already includes the family field (2) and the path null
                # terminator (1)
                vpath = vpath[:addrlen - 2 - 1]

            sockaddr_un = make_sockaddr_un(abits, endian, len(vpath) + 1)

            obj = sockaddr_un()
            obj.sun_family = AF_UNIX
            obj.sun_path = vpath.encode() + b'\x00'

        elif conn.family == AF_INET:
            sockaddr_in = make_sockaddr_in(abits, endian)
            host, port = address

            obj = sockaddr_in()
            obj.sin_family = AF_INET
            obj.sin_port = htons(ql, port)
            obj.sin_addr.s_addr = inet_aton(str(host))

        elif conn.family == AF_INET6 and ql.os.ipv6:
            sockaddr_in6 = make_sockaddr_in6(abits, endian)
            host, port = address