Hi Vincent,
Thanks, that pins things down. No --script-tun in the command line means the
normal teardown path applies: SIGINT -> OC_CMD_CANCEL -> os_shutdown_tun() ->
script_config_tun("disconnect") -> fork + waitpid, with tun_fd closed only
after the script exits (checked against the 9.12 source). A single Ctrl-C
should run vpnc-script to completion.
That sharpens the evidence. In the Debian vpnc-script, do_disconnect deletes
the split routes, then del_vpngateway_route, then RESTORERESOLVCONF; there is
no set -e, so a failed route delete would not stop the DNS restore. Your
+local1 while-loop only touches del_vpngateway_route. Since both the route and
the DNS survived on Mar 30, the script run itself was skipped or killed before
do_disconnect, not failed partway.
Two mechanisms fit, and both are checkable:
1. A second group signal during teardown. In 9.12 the script is forked into
openconnect's own process group (no setpgid; upstream fixed this in c0ed1606,
merged 2025-07-26, first released in v9.20). A second Ctrl-C during teardown
delivers SIGINT to the group again: the script dies from it (plain sh, no
traps), and waitpid() returns EINTR (no SA_RESTART), so openconnect prints
"Failed to spawn script ... Interrupted system call" and exits. Result: VPN
route and VPN DNS left behind, exactly what you saw on Mar 30.
2. A sourced /etc/vpnc/disconnect.d hook calling exit. run_hooks sources the
scripts, so an exit in a disconnect hook terminates vpnc-script before
do_disconnect runs.
Could you check two things?
- One Ctrl-C or two on Mar 30? If the first press didn't visibly react, a
second is enough to hit mechanism 1.
- Does /etc/vpnc/disconnect.d contain anything on that machine? And if you
still have the terminal output from that session, look for "Failed to spawn
script".
On the vpnc-scripts drift you noticed: Debian 0.1~git20220510 is three years
behind upstream, which is why the context around commit 8214218 differs. A
snapshot refresh is part of the plan if the package gets adopted (openconnect
was orphaned as #1144686; I am preparing an adoption).
I have the c0ed1606 backport (one-line setpgid) drafted for the 9.12 tree, plus
an ocserv-based autopkgtest plan to assert route+DNS restore after SIGINT, once
the package is under maintenance.
Ivo
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