Function ql_syscall_sendto

qiling/os/posix/syscall/socket.py:821–882

(ql: Qiling, sockfd: int, buf: int, length: int, flags: int, addr: int, addrlen: int)

def ql_syscall_sendto(ql: Qiling, sockfd: int, buf: int, length: int, flags: int, addr: int, addrlen: int):
    sock = get_opened_socket(ql.os, sockfd)

    if isinstance(sock, int):
        return sock

    # if sendto is used on a connection-mode socket, the arguments addr and addrlen are ignored.
    # also, calling sendto(sockfd, buf, length, flags, NULL, 0) is equivalent to send(sockfd, buf, length, flags)
    if sock.socktype in (SOCK_STREAM, SOCK_SEQPACKET) or (addr == 0 and addrlen == 0):
        return ql_syscall_send(ql, sockfd, buf, length, flags)

    tmp_buf = ql.mem.read(buf, length)

    ql.log.debug("sendto() CONTENT:")
    ql.log.debug("%s" % tmp_buf)

    data = ql.mem.read(addr, addrlen)

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

    sockaddr = make_sockaddr(abits, endian)
    sockaddr_obj = sockaddr.from_buffer(data)

    sa_family = sockaddr_obj.sa_family

    dest = None
    regreturn = 0

    if sa_family == AF_UNIX:
        hpath, vpath = ql_unix_socket_path(ql, data[2:])

        ql.log.debug(f'Sending {len(tmp_buf):d} bytes to {vpath}')
        dest = hpath

    elif sa_family == AF_INET:
        sockaddr = make_sockaddr_in(abits, endian)
        sockaddr_obj = sockaddr.from_buffer(data)

        port = ntohs(ql, sockaddr_obj.sin_port)
        host = inet_ntoa(sockaddr_obj.sin_addr.s_addr)

        ql.log.debug(f'Sending {len(tmp_buf):d} bytes to {host}:{port}')
        dest = (host, port)

    elif sa_family == AF_INET6 and ql.os.ipv6:
        sockaddr_in6 = make_sockaddr_in6(abits, endian)
        sockaddr_obj = sockaddr_in6.from_buffer(data)

        port = ntohs(ql, sockaddr_obj.sin6_port)
        host = inet6_ntoa(sockaddr_obj.sin6_addr.s6_addr)

        ql.log.debug(f'Sending to {host}:{port}')
        dest = (host, port)

    if dest is not None:
        try:
            regreturn = sock.sendto(tmp_buf, flags, dest)