[SCION] Connection failure w/ sciond on local topology.

[Michael A. Flückiger]

Sorry for the spam. I wasn't aware of the fact that images get stripped 
away. Therefore again my, this time complete, question.

Hi all

I'm trying to get the simple example found here 
<https://github.com/netsec-ethz/scion-apps/tree/master/_examples/helloworld> 
(/_examples/helloworld/) running. But I'm somehow not able to bind to 
the corresponding instance of the /sciond/.

I'm running /ubuntu 16.04/, /go version go1.13.9 /and was able to setup 
the SCION local network:

scion at mptcp-over-scion:~/go/src/github.com/scionproto/scion$ ./scion.sh 
topology -c topology/Tiny.topo
Shutting down: Terminating this run of the SCION infrastructure
Shut down
Stopping jaeger...
Compiling...
Starting local Bazel server and connecting to it...
INFO: Analyzed target //:build-tools (72 packages loaded, 6366 targets 
configured).
INFO: Found 1 target...
INFO: Deleting stale sandbox base 
/home/scion/.cache/bazel/_bazel_scion/2cdd3e64829d6e4629d18c7d46130b39/sandbox
Target //:build-tools up-to-date:
   bazel-bin/build-tools.tar
INFO: Elapsed time: 17.730s, Critical Path: 0.50s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
INFO: Analyzed 2 targets (312 packages loaded, 5259 targets configured).
INFO: Found 2 targets...
INFO: Elapsed time: 44.028s, Critical Path: 3.30s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
Create topology, configuration, and execution files.
Running jaeger...
Loading customer keys...
scion at mptcp-over-scion:~/go/src/github.com/scionproto/scion$ ./scion.sh run
Compiling...
INFO: Analyzed target //:build-tools (0 packages loaded, 0 targets 
configured).
INFO: Found 1 target...
Target //:build-tools up-to-date:
   bazel-bin/build-tools.tar
INFO: Elapsed time: 0.536s, Critical Path: 0.00s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
INFO: Analyzed 2 targets (0 packages loaded, 0 targets configured).
INFO: Found 2 targets...
INFO: Elapsed time: 1.368s, Critical Path: 0.09s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
Running the network...
scion at mptcp-over-scion:~/go/src/github.com/scionproto/scion$ ./scion.sh 
status
scion at mptcp-over-scion:~/go/src/github.com/scionproto/scion$ c

If I check for the listening sockets of the sciond i find the following:

scion at mptcp-over-scion:~$ ss -l -x | grep sciond
u_seq             LISTEN              0 128 
/run/shm/sciond/sd1-ff00_0_111.unix 
35072                                                 * 0
u_str             LISTEN              0 128 
/run/shm/sciond/sd1-ff00_0_112.sock 
34952                                                 * 0
u_seq             LISTEN              0 128 
/run/shm/sciond/sd1-ff00_0_112.unix 
34955                                                 * 0
u_str             LISTEN              0 128 
/run/shm/sciond/sd1-ff00_0_110.sock 
35014                                                 * 0
u_seq             LISTEN              0 128 
/run/shm/sciond/sd1-ff00_0_110.unix 
35017                                                 * 0
u_str             LISTEN              0 128 
/run/shm/sciond/sd1-ff00_0_111.sock 35069

If I now set the S/CION_DEAMON_SOCKET/ environment variable as required 
when running multiple local ASes and try to run /helloworld.go///I run 
in the following error:

scion at mptcp-over-scion:~/go/src/github.com/netsec-ethz/scion-apps/_examples/helloworld$ 
export SCION_DAEMON_ADDRESS=/run/shm/sciond/sd1-ff00_0_111.sock:35069
scion at mptcp-over-scion:~/go/src/github.com/netsec-ethz/scion-apps/_examples/helloworld$ 
go run helloworld.go -remote 1-ff00:0:111,[127.0.0.1]:2727
Error initializing SCION network: unable to connect to SCIOND at 
/run/shm/sciond/sd1-ff00_0_111.sock:35069 (override with 
SCION_DAEMON_ADDRESS): unable to connect to SCIOND
     dial tcp: lookup /run/shm/sciond/sd1-ff00_0_111.sock: no such host
     lookup /run/shm/sciond/sd1-ff00_0_111.sock: no such host
exit status 1

I am at my wit's end and would appreciate any help / hint into the right 
direction very much.

What am I doing wrong?

Thanks for your effort.

Best,

Michi