tcp_terminal on linux

[Prashanth Mundkur]

Hi,

I'm trying to use tcp_terminal on linux.  It of course prominently says:

# TODO: Add support for Linux via user-level networking (using the
#       tun/tap proxy driver at os/src/drivers/nic/linux)

After disabling the have_spec check, I can compile and run it.  After
setting the suid bit on drivers/nic/spec/linux/nic_drv to allow it to
access /dev/net/tun, I get the following output:

genode build completed
using 'core-linux' as 'core'
using 'ld-linux.lib.so' as 'ld.lib.so'
using 'linux_timer_drv' as 'timer'
spawn ./core
Genode 16.11-146-gc16ee83 <local changes>
17592186044415 MiB RAM assigned to init
[init] parent provides
[init]   service "ROM"
[init]   service "RAM"
[init]   service "IRQ"
[init]   service "IO_MEM"
[init]   service "IO_PORT"
[init]   service "PD"
[init]   service "RM"
[init]   service "CPU"
[init]   service "LOG"
[init] child "timer"
[init]   RAM quota:  798720
[init]   ELF binary: timer
[init]   priority:   0
[init]   provides service Timer
[init] child "nic_drv"
[init]   RAM quota:  3944448
[init]   ELF binary: nic_drv
[init]   priority:   0
[init]   provides service Nic
[init] child "tcp_terminal"
[init]   RAM quota:  2371584
[init]   ELF binary: tcp_terminal
[init]   priority:   0
[init]   provides service Terminal
[init] child "test-terminal_echo"
[init]   RAM quota:  798720
[init]   ELF binary: test-terminal_echo
[init]   priority:   0
[init] child "nic_drv" announces service "Nic"
[init -> test-terminal_echo] Warning: using legacy main function, please convert to 'Component::construct'
[init] child "timer" announces service "Timer"
[init -> tcp_terminal] using the pipe libc plugin
[init -> tcp_terminal] init_nic_dhcp
[init -> tcp_terminal] Using DHCP for interface configuration.
[init -> tcp_terminal] using the lwIP libc plugin
[init -> nic_drv] no config provided, using tap0
[init -> tcp_terminal] Warning: '<config> <libc> <vfs/>' is deprecated, please move to '<config> <vfs/>'
[init -> tcp_terminal] --- TCP terminal started ---
[init] child "tcp_terminal" announces service "Terminal"
[init -> tcp_terminal] listening on port 8888 with socket 16...
[init -> tcp_terminal] adding listen sock 16 to select set

Though I can see the tap device,

15: tap0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether c2:60:31:f8:52:fc brd ff:ff:ff:ff:ff:ff

I don't see any listening socket on port 8888.

So clearly there is some missing plumbing.  What do I need to do to
fill that in?

Thanks,

--prashanth