Package: xinetd
Version: 1:2.3.15.3-1+b1
Severity: important
Dear Maintainer,
I'm trying to create a simple TCPMUXPLUS service that takes a TCP connection
and returns a predetermined amount a entropy.
Here is my xinet.d conf file:
# default: off
# description: An xinetd service which provides entropy.
# the shell script called will return 128 bytes of entropy to the caller.
service entropy
{
id = entropy
type = TCPMUXPLUS UNLISTED
socket_type = stream
protocol = tcp
disable = no
# flags = KEEPALIVE IPv4
instances = 40
server = /srv/xinetd-entropy.sh
log_type = FILE /var/log/entropy-xinetd.log
log_on_success = PID HOST USERID EXIT DURATION
log_on_failure = HOST USERID ATTEMPT
user = nobody
wait = no
}
In this form, restarting xinetd produces this syslog output:
systemd[1]: Started xinetd.service - LSB: Starts or stops the xinetd daemon..
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/chargen
[file=/etc/xinetd.conf] [line=14]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/chargen-udp
[file=/etc/xinetd.d/chargen-udp] [line=28]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/daytime
[file=/etc/xinetd.d/daytime] [line=14]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/daytime-udp
[file=/etc/xinetd.d/daytime-udp] [line=26]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/discard
[file=/etc/xinetd.d/discard] [line=14]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/discard-udp
[file=/etc/xinetd.d/discard-udp] [line=25]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/echo
[file=/etc/xinetd.d/echo] [line=14]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/echo-udp
[file=/etc/xinetd.d/echo-udp] [line=26]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/egd-py
[file=/etc/xinetd.d/egd-py] [line=14]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/entropy
[file=/etc/xinetd.d/entropy] [line=21]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/servers
[file=/etc/xinetd.d/servers] [line=21]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/services
[file=/etc/xinetd.d/services] [line=13]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/time
[file=/etc/xinetd.d/time] [line=13]
xinetd[9295]: Reading included configuration file: /etc/xinetd.d/time-udp
[file=/etc/xinetd.d/time-udp] [line=28]
xinetd[9295]: 2.3.15.3 started with libwrap loadavg labeled-networking options
compiled in.
xinetd[9295]: Started working: 0 available services
----
When I comment out the socket_type and protocol lines in the conf (since they
are redundant to type being TCPMUXPLUS), restarting xinetd segfaults:
systemd[1]: Started xinetd.service - LSB: Starts or stops the xinetd daemon..
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/chargen
[file=/etc/xinetd.conf] [line=14]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/chargen-udp
[file=/etc/xinetd.d/chargen-udp] [line=28]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/daytime
[file=/etc/xinetd.d/daytime] [line=14]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/daytime-udp
[file=/etc/xinetd.d/daytime-udp] [line=26]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/discard
[file=/etc/xinetd.d/discard] [line=14]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/discard-udp
[file=/etc/xinetd.d/discard-udp] [line=25]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/echo
[file=/etc/xinetd.d/echo] [line=14]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/echo-udp
[file=/etc/xinetd.d/echo-udp] [line=26]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/egd-py
[file=/etc/xinetd.d/egd-py] [line=14]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/entropy
[file=/etc/xinetd.d/entropy] [line=21]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/servers
[file=/etc/xinetd.d/servers] [line=21]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/services
[file=/etc/xinetd.d/services] [line=13]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/time
[file=/etc/xinetd.d/time] [line=13]
xinetd[9364]: Reading included configuration file: /etc/xinetd.d/time-udp
[file=/etc/xinetd.d/time-udp] [line=28]
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {general_handler} (9364) Unexpected signal: 11 (Segmentation
fault)
xinetd[9364]: 9364 {bad_signal} Received 10 signals in 1 seconds. Exiting...
----
Now, if my service conf is wrong in some way, that's fine, but xinetd shouldn't
segfault at those two lines being commented out.
And from what I can tell, my conf file in either form should get xinetd to load
up and listen on port 1 with at least "1 available services"
(There is a dirth of TCPMUX examples out in the wild.)
-- System Information:
Debian Release: 12.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 6.1.0-13-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages xinetd depends on:
ii libc6 2.36-9+deb12u3
ii libselinux1 3.4-1+b6
ii libtirpc3 1.3.3+ds-1
ii libwrap0 7.6.q-32
ii lsb-base 11.6
ii netbase 6.4
ii sysvinit-utils [lsb-base] 3.06-4
Versions of packages xinetd recommends:
ii logrotate 3.21.0-1
ii rsyslog [system-log-daemon] 8.2302.0-1
ii update-inetd 4.53
xinetd suggests no packages.
-- no debconf information
