8 releases

0.4.2 Dec 31, 2021
0.4.1 Jun 2, 2021
0.4.0 May 20, 2021
0.2.2 Apr 5, 2021
0.1.0 Jul 20, 2020
Download history 4/week @ 2022-02-02 2/week @ 2022-02-09 7/week @ 2022-02-16 13/week @ 2022-02-23 61/week @ 2022-03-02 6/week @ 2022-03-09 39/week @ 2022-03-16 32/week @ 2022-03-23 5/week @ 2022-03-30 5/week @ 2022-04-06 5/week @ 2022-04-13 3/week @ 2022-04-20 59/week @ 2022-04-27 49/week @ 2022-05-04 130/week @ 2022-05-11 40/week @ 2022-05-18

278 downloads per month
Used in 4 crates

MIT license

24KB
572 lines

netsim-embed

A small embeddable network simulator based on the currently unmaintained netsim.

If you get a no such device error make sure that the tun kernel module is loaded (insmod tun) and that the tun device file exists (/dev/net/tun).

Run the example:

cargo run --example smol
    Finished dev [unoptimized + debuginfo] target(s) in 0.03s
     Running `target/debug/examples/smol`
[2020-07-09T16:09:17Z TRACE netsim_embed_machine::namespace] created network namespace: /proc/10753/task/10850/ns/net
[2020-07-09T16:09:17Z TRACE netsim_embed_machine::namespace] created network namespace: /proc/10753/task/10849/ns/net
[2020-07-09T16:09:17Z INFO  netsim_embed_machine] machine 192.168.1.5: sending packet
[2020-07-09T16:09:17Z INFO  netsim_embed_machine] machine 8.8.8.4: sending packet
[2020-07-09T16:09:17Z INFO  netsim_embed_machine] machine 192.168.1.5: sending packet
[2020-07-09T16:09:17Z INFO  netsim_embed_nat::nat] nat 8.8.8.8: dropping invalid outbound packet
[2020-07-09T16:09:17Z INFO  netsim_embed_router] router 8.8.8.1: dropping unroutable packet to 71.23.170.98
[2020-07-09T16:09:17Z INFO  netsim_embed_router] router 8.8.8.1: dropping unroutable packet to 71.23.170.98
[2020-07-09T16:09:17Z INFO  netsim_embed_nat::nat] nat 8.8.8.8: rewrote packet source address: 192.168.1.5:33542 => 8.8.8.8:49152
[2020-07-09T16:09:17Z INFO  netsim_embed_router] router 8.8.8.1: dropping unroutable packet to 8.8.8.4
[2020-07-09T16:09:17Z INFO  netsim_embed_router] router 8.8.8.1: routing packet on route Ipv4Route { dest: 8.8.8.4/32, gateway: None }
[2020-07-09T16:09:17Z INFO  netsim_embed_machine] machine 8.8.8.4: received packet
received ping
[2020-07-09T16:09:17Z INFO  netsim_embed_machine] machine 8.8.8.4: sending packet
[2020-07-09T16:09:17Z INFO  netsim_embed_router] router 8.8.8.1: routing packet on route Ipv4Route { dest: 8.8.8.8/32, gateway: None }
[2020-07-09T16:09:17Z INFO  netsim_embed_nat::nat] nat 8.8.8.8: rewrote destination of inbound packet 8.8.8.8:49152 => 192.168.1.5:33542.
[2020-07-09T16:09:17Z INFO  netsim_embed_machine] machine 192.168.1.5: received packet
received pong

Enter the network namespace and debug dropped packets with netstat:

sudo nsenter --net=/proc/10753/task/10850/ns/net
[root@dvc-xps13-2020 dvc]# netstat -suna
Udp:
    0 packets received
    0 packets to unknown port received
    0 packet receive errors
    1 packets sent
    0 receive buffer errors
    0 send buffer errors
UdpLite:
IpExt:
    OutOctets: 32
MPTcpExt:

License

MIT OR Apache-2.0

Dependencies

~3.5–4.5MB
~97K SLoC