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Merge pull request #217 from flaviojs/fix-buffer-overflow-eth_switch
Fix buffer overflow in eth_switch.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| #!/usr/bin/env python3 | ||
| # -*- coding: utf8 -*- | ||
| # | ||
| # test script for issue #105 "Ethernet switch crashes on JumboFrames+dot1q" | ||
| # @see https://github.com/GNS3/dynamips/issues/105 | ||
| # | ||
| # assumes a linux OS and dynamips in ../build/stable | ||
|
|
||
| linux_setup = """ | ||
| sudo ip link add vl0 type veth peer name vl1 | ||
| sudo ip link add vr0 type veth peer name vr1 | ||
| sudo ip l set up vl0 mtu 9000 | ||
| sudo ip l set up vr0 mtu 9000 | ||
| sudo ip netns add left | ||
| sudo ip netns add right | ||
| sudo ip link set dev vl1 netns left | ||
| sudo ip link set dev vr1 netns right | ||
| sudo ip netns exec left ip link set vl1 up mtu 9000 | ||
| sudo ip netns exec right ip link set vr1 up mtu 9000 | ||
| sudo ip netns exec left ip addr add 10.0.0.1/24 dev vl1 | ||
| sudo ip netns exec right ip addr add 10.0.0.2/24 dev vr1 | ||
| """ | ||
|
|
||
| linux_cleanup = """ | ||
| sudo ip netns del right | ||
| sudo ip netns del left | ||
| """ | ||
|
|
||
| hypervisor = """ | ||
| ethsw create sw1 | ||
| nio create_gen_eth E10 vl0 | ||
| nio create_udp E11 10001 127.0.0.1 20001 | ||
| ethsw add_nio sw1 E10 | ||
| ethsw add_nio sw1 E11 | ||
| ethsw set_access_port sw1 E10 10 | ||
| ethsw set_dot1q_port sw1 E11 1 | ||
| ethsw create sw2 | ||
| nio create_gen_eth E20 vr0 | ||
| nio create_udp E21 20001 127.0.0.1 10001 | ||
| ethsw add_nio sw2 E20 | ||
| ethsw add_nio sw2 E21 | ||
| ethsw set_access_port sw2 E20 10 | ||
| ethsw set_dot1q_port sw2 E21 1 | ||
| """ | ||
|
|
||
| # success: all pings work | ||
| # fail: buffer overflow in dynamips | ||
| linux_test = """ | ||
| sudo ip netns exec left ping 10.0.0.2 -s 8000 -c 10 | ||
| """ | ||
|
|
||
| import subprocess | ||
| import time | ||
|
|
||
| def sleep(secs=0.1): | ||
| time.sleep(secs) # give some time to other processes | ||
|
|
||
| def each_line(code): | ||
| for line in code.split("\n"): | ||
| line = line.strip() | ||
| if line == "": | ||
| continue | ||
| yield line | ||
|
|
||
| def run_script(script, prefix=""): | ||
| for line in each_line(script): | ||
| print(prefix, line) | ||
| subprocess.run(line.split()) | ||
| sleep() | ||
|
|
||
| def dynamips_hypervisor(): | ||
| # stdin needs to be a PIPE to protect the script console | ||
| dynamips = subprocess.Popen( | ||
| ["sudo", "./dynamips", "-H", "10000"], | ||
| cwd="../build/stable", | ||
| text=True, | ||
| stdin=subprocess.PIPE, | ||
| stderr=subprocess.STDOUT) | ||
| sleep(1) # extra time for 1st time stuff | ||
| return dynamips | ||
|
|
||
| def telnet_hypervisor(): | ||
| telnet = subprocess.Popen( | ||
| ["telnet", "127.0.0.1", "10000"], | ||
| text=True, | ||
| stdin=subprocess.PIPE, | ||
| stderr=subprocess.STDOUT) | ||
| def run_script(script, prefix=""): | ||
| for line in each_line(script): | ||
| print(prefix, line) | ||
| telnet.stdin.write(line + "\n") | ||
| telnet.stdin.flush() | ||
| sleep() | ||
| telnet.run_script = run_script | ||
| sleep() | ||
| return telnet | ||
|
|
||
|
|
||
| run_script(linux_setup, prefix="[SETUP]") | ||
| print("[DYNAMIPS.START]") | ||
| with dynamips_hypervisor() as dynamips: | ||
| print("[TELNET.START]") | ||
| with telnet_hypervisor() as telnet: | ||
| telnet.run_script(hypervisor, prefix="[TELNET]") | ||
| print("[TELNET.STOP]") | ||
| run_script(linux_test, prefix="[TEST]") | ||
| dynamips.terminate() | ||
| sleep() | ||
| dynamips.kill() | ||
| print("[DYNAMIPS.STOP]") | ||
| run_script(linux_cleanup, prefix="[CLEANUP]") |