[Samba] Slow and Incomplete printing from DOS Client 3.0

Wed Jun 17 17:01:29 UTC 2020

Hi All,

I am seeing issues printing to a text file.  I am using Samba Version
4.12.3 and CUPS 2.3.3.  I have written a simple BASH backend for CUPS
to simply copy the  RAW contents and save it as a file.  I do not
believe this is an issue with CUPS simply because I can print from a
Windows 7 Terminal doing something such as:

NET USE LPT1:  \\10.111.11.130\RAWCAPTURE
DIR C:\ > LPT1

The directory list gets printed out to a text file.

On  a DOS PC with the Microsoft Network Client 3.0 I get a file with a
blank line followed by five  lines of text:

Volume in drive C is MEMDISK_C
Volume Serial Number is 4D25-900E
Directory of C:\

DOS            <DIR>        06

The information written is stopped and incomplete.  It also takes a
much longer time to complete the command.

I also noticed in the log file that the DOS client had

print_cache_expired: cache expired for queue rawcapture
(last_qscan_time = 1592403175, time now = 1592403557, qcachetime = 30)

and I could only make this disappear if I changed the global option to

lpq cache time = 500

However, this change does not fix the issue.  I am including the
smb.conf as generated by testparm and also the simple backend for the
raw print capture to a file.

Does anyone have any suggestions on what to look for or try next.

Kind Regards,

Adan

Output of testparm –v:
# Global parameters
[global]
abort shutdown script =
add group script =
additional dns hostnames =
add machine script =
addport command =
addprinter command =
add share command =
add user script =
add user to group script =
afs token lifetime = 604800
afs username map =
aio max threads = 100
algorithmic rid base = 1000
allow dcerpc auth level connect = No
allow dns updates = secure only
allow insecure wide links = No
allow nt4 crypto = No
allow trusted domains = Yes
allow unsafe cluster upgrade = No
apply group policies = No
async smb echo handler = No
auth event notification = No
auto services =
binddns dir = /var/lib/samba/bind-dns
bind interfaces only = No
browse list = Yes
cache directory = /var/cache/samba
change notify = Yes
change share command =
check password script =
cldap port = 389
client ipc max protocol = default
client ipc min protocol = default
client ipc signing = if_required
client lanman auth = Yes
client ldap sasl wrapping = sign
client max protocol = default
client min protocol = LANMAN1
client NTLMv2 auth = No
client plaintext auth = Yes
client schannel = Yes
client signing = default
client use spnego principal = No
client use spnego = Yes
cluster addresses =
clustering = No
config backend = file
config file =
create krb5 conf = Yes
ctdbd socket =
ctdb locktime warn threshold = 0
ctdb timeout = 0
cups connection timeout = 30
cups encrypt = No
cups server =
dcerpc endpoint servers = epmapper, wkssvc, rpcecho, samr, netlogon,
lsarpc, drsuapi, dssetup, unixinfo, browser, eventlog6, backupkey,
dnsserver
deadtime = 0
debug class = No
debug encryption = No
debug hires timestamp = Yes
debug pid = No
debug prefix timestamp = No
debug uid = No
dedicated keytab file =
default service =
defer sharing violations = Yes
delete group script =
deleteprinter command =
delete share command =
delete user from group script =
delete user script =
dgram port = 138
disable netbios = No
disable spoolss = No
dns forwarder =
dns proxy = No
dns update command = /usr/sbin/samba_dnsupdate
dns zone scavenging = No
domain logons = No
domain master = Auto
dos charset = CP850
dsdb event notification = No
dsdb group change notification = No
dsdb password event notification = No
enable asu support = No
enable core files = Yes
enable privileges = Yes
encrypt passwords = Yes
enhanced browsing = Yes
enumports command =
eventlog list =
get quota command =
getwd cache = Yes
gpo update command = /usr/sbin/samba-gpupdate
guest account = nobody
homedir map = auto.home
host msdfs = Yes
hostname lookups = No
idmap backend = tdb
idmap cache time = 604800
idmap gid =
idmap negative cache time = 120
idmap uid =
include system krb5 conf = Yes
init logon delay = 100
init logon delayed hosts =
interfaces =
iprint server =
keepalive = 300
kerberos encryption types = all
kerberos method = default
kernel change notify = Yes
kpasswd port = 464
krb5 port = 88
lanman auth = Yes
large readwrite = Yes
ldap admin dn =
ldap connection timeout = 2
ldap debug level = 0
ldap debug threshold = 10
ldap delete dn = No
ldap deref = auto
ldap follow referral = Auto
ldap group suffix =
ldap idmap suffix =
ldap machine suffix =
ldap max anonymous request size = 256000
ldap max authenticated request size = 16777216
ldap max search request size = 256000
ldap page size = 1000
ldap passwd sync = no
ldap replication sleep = 1000
ldap server require strong auth = Yes
ldap ssl = start tls
ldap ssl ads = No
ldap suffix =
ldap timeout = 15
ldap user suffix =
lm announce = Yes
lm interval = 60
load printers = Yes
local master = Yes
lock directory = /var/cache/samba
lock spin time = 200
log file = /var/log/samba/samba.%m
logging =
log level = 1
log nt token command =
logon drive =
logon home = \\%N\%U
logon path = \\%N\%U\profile
logon script =
log writeable files on exit = No
lpq cache time = 30
lsa over netlogon = No
machine password timeout = 604800
mangle prefix = 1
mangling method = hash2
map to guest = Bad User
max disk size = 0
max log size = 50
max mux = 50
max open files = 16384
max smbd processes = 0
max stat cache size = 512
max ttl = 259200
max wins ttl = 518400
max xmit = 65535
mdns name = netbios
message command =
min receivefile size = 0
min wins ttl = 21600
mit kdc command = /usr/sbin/krb5kdc
multicast dns register = Yes
name cache timeout = 660
name resolve order = lmhosts wins host bcast
nbt client socket address = 0.0.0.0
nbt port = 137
ncalrpc dir = /var/run/samba/ncalrpc
netbios aliases =
netbios name = LBUFSERVER
netbios scope =
neutralize nt4 emulation = No
NIS homedir = No
nmbd bind explicit broadcast = Yes
nsupdate command = /usr/bin/nsupdate -g
ntlm auth = ntlmv1-permitted
nt pipe support = Yes
ntp signd socket directory = /var/lib/samba/ntp_signd
nt status support = Yes
null passwords = No
obey pam restrictions = No
old password allowed period = 60
oplock break wait time = 0
os2 driver map =
os level = 20
pam password change = No
panic action =
passdb backend = tdbsam
passdb expand explicit = No
passwd chat = *new*password* %n\n *new*password* %n\n *changed*
passwd chat debug = No
passwd chat timeout = 2
passwd program =
password hash gpg key ids =
password hash userPassword schemes =
password server = *
perfcount module =
pid directory = /var/run
preferred master = Yes
prefork backoff increment = 10
prefork children = 4
prefork maximum backoff = 120
preload modules =
printcap cache time = 750
printcap name = cups
private dir = /var/lib/samba/private
raw NTLMv2 auth = No
read raw = Yes
realm =
registry shares = No
reject md5 clients = No
reject md5 servers = No
remote announce =
remote browse sync =
rename user script =
require strong key = Yes
reset on zero vc = No
restrict anonymous = 0
root directory =
rpc big endian = No
rpc server dynamic port range = 49152-65535
rpc server port = 0
samba kcc command = /usr/sbin/samba_kcc
security = AUTO
server max protocol = SMB3
server min protocol = LANMAN1
server multi channel support = No
server role = standalone server
server schannel = Yes
server services = s3fs, rpc, nbt, wrepl, ldap, cldap, kdc, drepl,
winbindd, ntp_signd, kcc, dnsupdate, dns
server signing = default
server string = L BUF Data Server
set primary group script =
set quota command =
share backend = classic
show add printer wizard = Yes
shutdown script =
smb2 leases = Yes
smb2 max credits = 8192
smb2 max read = 8388608
smb2 max trans = 8388608
smb2 max write = 8388608
smbd profiling level = off
smb passwd file = /var/lib/samba/private/smbpasswd
smb ports = 445 139
socket options = TCP_NODELAY
spn update command = /usr/sbin/samba_spnupdate
stat cache = Yes
state directory = /var/lib/samba
svcctl list =
syslog = 1
syslog only = No
template homedir = /home/%D/%U
template shell = /bin/false
time server = No
timestamp logs = Yes
tls cafile = tls/ca.pem
tls certfile = tls/cert.pem
tls crlfile =
tls dh params file =
tls enabled = Yes
tls keyfile = tls/key.pem
tls priority = NORMAL:-VERS-SSL3.0
tls verify peer = as_strict_as_possible
unicode = Yes
unix charset = UTF-8
unix extensions = Yes
unix password sync = No
use mmap = Yes
username level = 0
username map =
username map cache time = 0
username map script =
usershare allow guests = Yes
usershare max shares = 0
usershare owner only = Yes
usershare path = /var/lib/samba/usershares
usershare prefix allow list =
usershare prefix deny list =
usershare template share =
utmp = No
utmp directory =
winbind cache time = 300
winbindd socket directory = /var/run/samba/winbindd
winbind enum groups = No
winbind enum users = No
winbind expand groups = 0
winbind max clients = 200
winbind max domain connections = 1
winbind nested groups = Yes
winbind normalize names = No
winbind nss info = template
winbind offline logon = No
winbind reconnect delay = 30
winbind refresh tickets = No
winbind request timeout = 60
winbind rpc only = No
winbind scan trusted domains = Yes
winbind sealed pipes = Yes
winbind separator = \
winbind use default domain = No
winbind use krb5 enterprise principals = No
wins hook =
wins proxy = No
wins server =
wins support = No
workgroup = WORKGROUP
write raw = Yes
wtmp directory =
idmap config * : backend = tdb
access based share enum = No
acl allow execute always = No
acl check permissions = Yes
acl group control = No
acl map full control = Yes
administrative share = No
admin users =
afs share = No
aio read size = 1
aio write behind =
aio write size = 1
allocation roundup size = 0
available = Yes
blocking locks = Yes
block size = 1024
browseable = Yes
case sensitive = Auto
check parent directory delete on close = No
comment =
copy =
create mask = 0744
csc policy = manual
cups options =
default case = lower
default devmode = Yes
delete readonly = No
delete veto files = No
dfree cache time = 0
dfree command =
directory mask = 0755
directory name cache size = 100
dmapi support = No
dont descend =
dos filemode = No
dos filetime resolution = No
dos filetimes = Yes
durable handles = Yes
ea support = Yes
fake directory create times = No
fake oplocks = No
follow symlinks = Yes
force create mode = 0000
force directory mode = 0000
force group =
force printername = No
force unknown acl user = No
force user =
fstype = NTFS
guest ok = Yes
guest only = No
hide dot files = Yes
hide files =
hide new files timeout = 0
hide special files = No
hide unreadable = No
hide unwriteable files = No
hosts allow =
hosts deny =
include =
inherit acls = No
inherit owner = no
inherit permissions = No
invalid users =
kernel oplocks = No
kernel share modes = Yes
level2 oplocks = Yes
locking = Yes
lppause command =
lpq command = %p
lpresume command =
lprm command =
magic output =
magic script =
mangled names = illegal
mangling char = ~
map acl inherit = No
map archive = Yes
map hidden = No
map readonly = no
map system = No
max connections = 0
max print jobs = 1000
max reported print jobs = 0
min print space = 0
msdfs proxy =
msdfs root = No
msdfs shuffle referrals = No
nt acl support = Yes
ntvfs handler = unixuid, default
oplocks = Yes
path =
posix locking = Yes
postexec =
preexec =
preexec close = No
preserve case = Yes
printable = No
print command =
printer name =
printing = cups
printjob username = %U
print notify backchannel = No
queuepause command =
queueresume command =
read list =
read only = Yes
root postexec =
root preexec =
root preexec close = No
short preserve case = Yes
smbd async dosmode = No
smbd getinfo ask sharemode = Yes
smbd max async dosmode = 0
smbd search ask sharemode = Yes
smb encrypt = default
spotlight = No
spotlight backend = noindex
store dos attributes = Yes
strict allocate = No
strict locking = Auto
strict rename = No
strict sync = Yes
sync always = No
use client driver = No
use sendfile = No
valid users =
veto files =
veto oplock files =
vfs objects =
volume =
wide links = No
write list =

[homes]
browseable = No
comment = Home Directories
read only = No

[printers]
browseable = No
comment = All Printers
path = /var/spool/samba
printable = Yes

[DRIVE_G]
comment = Drive G
level2 oplocks = No
map hidden = Yes
map readonly = yes
map system = Yes
oplocks = No
path = /DRIVE_G
read only = No

[tftpboot]
comment = tftpboot
path = /tftpboot
read only = No

[PRINTED_PDFs]
comment = Printed PDFs
path = /PDFs
read only = No

[RAW_Captures]
comment = RAW Captured Printouts
path = /RAWcaps
read only = No

root at LBUFSERVER:/var/log/samba# cat /usr/lib64/cups/backend/rawcapture
#!/bin/sh
# -------------------------------------------------------------------
# "/usr/lib64/cups/backend/rawcapture":
# -------------------------------------------------------------------
#
FILENAME=
PRINTTIME=`date +%Y-%m-%d_%H.%M.%S`
# no argument, prints available URIs
if [ $# -eq 0 ]; then
echo "No Arguments"
exit 0
fi
# case of wrong number of arguments
if [ $# -ne 5 -a $# -ne 6 ]; then
echo "Usage: rawcapture job-id user title copies options [file]"
exit 1
fi
# get output directory from device URI, and check write status
SAVEDIR=${DEVICE_URI#rawcapture:}
if [ ! -d "$SAVEDIR" -o ! -w "$SAVEDIR" ]; then
echo "ERROR: directory $SAVEDIR not writable"
exit 1
fi
# generate output filename
OUTPUTFILENAME=
if [ "$3" = "" ]; then
OUTPUTFILENAME="$SAVEDIR/unknown.cap"
else
if [ "$2" != "" ]; then
OUTPUTFILENAME="$SAVEDIR/$2-$PRINTTIME.cap"
else
OUTPUTFILENAME="$SAVEDIR/$PRINTTIME.cap"
fi
fi

# Copy File
cp $6 $OUTPUTFILENAME

# Make the file visible and writable by everyone.
chmod 777 $OUTPUTFILENAME
exit 0

# EOF
# -------------------------------------------------------------------