saned not find scanner that scanimage -L finds

Bug #1632183 reported by mike Bernson
14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
sane-backends (Ubuntu)
Invalid
Low
Unassigned

Bug Description

When running scanimage -L on a remote system no scanner is found.
when running scanimage -L on local system (where saned is run) finds the scanners.

when running scaned in debug mode I can see the remote system request a list of scanner but no list is returned to scanimge -L. This tell me the network setups are working and access control is also working. It just does not find the scanner under saned but finds it under scanimage -L

I have remove saned stuff from systemd so I can run saned by hand

output from scanimage on local system (where saned is run)
root@cups:~# scanimage -L
device `hpaio:/net/HP_Color_LaserJet_CM2320nf_MFP?ip=192.168.1.238' is a Hewlett-Packard HP_Color_LaserJet_CM2320nf_MFP all-in-one
device `hpaio:/net/Photosmart_Prem_C410_series?zc=HPF3B712' is a Hewlett-Packard Photosmart_Prem_C410_series all-in-one
device `hpaio:/net/photosmart_prem_c410_series?ip=192.168.1.31&queue=false' is a Hewlett-Packard photosmart_prem_c410_series all-in-one
root@cups:~#

output from saned with debug turned on:
root@cups:~# saned -d128
[saned] main: starting debug mode (level 128)
[saned] read_config: searching for config file
[saned] read_config: data port range: 10000 - 10100
[saned] read_config: done reading config
[saned] saned (AF-indep+IPv6) from sane-backends 1.0.25git starting up
[saned] do_bindings: trying to get port for service "sane-port" (getaddrinfo)
[saned] do_bindings: [1] socket () using IPv6
[saned] do_bindings: [1] setsockopt ()
[saned] do_bindings: [1] bind () to port 6566
[saned] do_bindings: [1] listen ()
[saned] do_bindings: [0] socket () using IPv4
[saned] do_bindings: [0] setsockopt ()
[saned] do_bindings: [0] bind () to port 6566
[saned] do_bindings: [0] bind failed: Address already in use
[saned] run_standalone: spawning Avahi process
[saned] run_standalone: waiting for control connection
[saned] saned_avahi_callback: AVAHI_CLIENT_S_RUNNING
[saned] saned_create_avahi_services: adding service 'saned'
[saned] saned_avahi_group_callback: service 'saned' successfully established
[saned] handle_connection: processing client connection
[saned] check_host: detected an IPv4-mapped address
[saned] check_host: access by remote host: ::ffff:192.168.1.141
[saned] check_host: remote host is not IN_LOOPBACK nor IN6_LOOPBACK
[saned] check_host: local hostname: cups
[saned] check_host: local hostname(s) (from DNS): cups.mlb.org
[saned] check_host: local hostname(s) (from DNS): (null)
[saned] check_host: local hostname(s) (from DNS): (null)
[saned] check_host: remote host doesn't have same addr as local
[saned] check_host: opening config file: /etc/hosts.equiv
[saned] check_host: can't open config file: /etc/hosts.equiv (No such file or directory)
[saned] check_host: opening config file: saned.conf
[saned] check_host: config file line: `# saned.conf'
[saned] check_host: config file line: `# Configuration for the saned daemon'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `## Daemon options'
[saned] check_host: config file line: `# Port range for the data connection. Choose a range inside [1024 - 65535].'
[saned] check_host: config file line: `# Avoid specifying too large a range, for performance reasons.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# ONLY use this if your saned server is sitting behind a firewall. If your'
[saned] check_host: config file line: `# firewall is a Linux machine, we strongly recommend using the'
[saned] check_host: config file line: `# Netfilter nf_conntrack_sane connection tracking module instead.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `data_portrange = 10000 - 10100'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `'
[saned] check_host: config file line: `## Access list'
[saned] check_host: config file line: `# A list of host names, IP addresses or IP subnets (CIDR notation) that'
[saned] check_host: config file line: `# are permitted to use local SANE devices. IPv6 addresses must be enclosed'
[saned] check_host: config file line: `# in brackets, and should always be specified in their compressed form.'
[saned] check_host: config file line: `#'
[saned] check_host: config file line: `# The hostname matching is not case-sensitive.'
[saned] check_host: config file line: `192.168.1.0/24'
[saned] check_host: subnet with base IP = 192.168.1.0, CIDR netmask = 24
[saned] check_host: access granted from IP address 192.168.1.141 (in subnet 192.168.1.0/24)
[saned] init: access granted
[saned] init: access granted to batch@::ffff:192.168.1.141
[saned] process_request: waiting for request
[saned] process_request: got request 1
[saned] process_request: waiting for request
[saned] process_request: got request 10
[saned] bailing out, waiting for children...
[saned] bail_out: all children exited
root@cups:~#

output from remote system access scaned
batch@ltcd-root:~$ scanimage -L

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
batch@ltcd-root:~$

WORKAROUND: Patch saned.c via:
https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1632183/+attachment/4859713/+files/saned.txt

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: sane-utils 1.0.25+git20150528-1ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
NonfreeKernelModules: binfmt_misc ipmi_devintf veth iptable_filter ip_tables x_tables bridge stp llc zfs zunicode zcommon znvpair spl zavl gpio_ich intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ipmi_ssif aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw lpc_ich input_leds joydev i2c_ismt ipmi_si ipmi_msghandler 8250_fintek shpchp mac_hid nfsd auth_rpcgss nfs_acl lockd grace sunrpc lp parport autofs4 igb dca ast ttm drm_kms_helper syscopyarea sysfillrect hid_generic sysimgblt fb_sys_fops uas ptp ahci pps_core libahci i2c_algo_bit drm usb_storage usbhid fjes hid
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Mon Oct 10 22:56:40 2016
ProcEnviron:
 TERM=xterm-256color
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
 XDG_RUNTIME_DIR=<set>
SourcePackage: sane-backends
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.default.saned: 2016-10-09T21:44:20.500603
mtime.conffile..etc.sane.d.saned.conf: 2016-10-10T12:26:22.069621

Revision history for this message
mike Bernson (mike-mlb) wrote :
Revision history for this message
Christopher M. Peñalver (penalvch) wrote :

mike Bernson, thank you for reporting this and helping make Ubuntu better.

To advise, the saned documentation has been rewritten. Hence, could you please advise if it helps following https://help.ubuntu.com/community/SaneDaemonTutorial ?

Changed in sane-backends (Ubuntu):
importance: Undecided → Low
status: New → Incomplete
Rolf Leggewie (r0lf)
description: updated
description: updated
description: updated
Revision history for this message
Launchpad Janitor (janitor) wrote :

[Expired for sane-backends (Ubuntu) because there has been no activity for 60 days.]

Changed in sane-backends (Ubuntu):
status: Incomplete → Expired
Revision history for this message
mike Bernson (mike-mlb) wrote :

The problem still exists

I needed to patch saned.c:

I needed to change SANE_TRUE to SANE_FALSE

at line 1830:
         reply.status =
          sane_get_devices ((const SANE_Device ***) &reply.device_list,
                            SANE_FALSE);

Changed in sane-backends (Ubuntu):
status: Expired → New
description: updated
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "Here is the patch I need to get saned to find all the scanners" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags: added: patch
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in sane-backends (Ubuntu):
status: New → Confirmed
Revision history for this message
Bob/Paul (ubuntu-launchpad-bobpaul) wrote :

As I understand it, this is an upstream design choice. saned doesn't let users select which scanners to share, it just shares any scanners that it can see. I think if network scanners were shared, then 2 saned instances on the same network get into a loop sharing the same scanner(s) recursively.

Nothing in the SaneDaemonTutorial points out this issue and it certainly wasn't clear to me from the saned manpage that this would be a problem.

Revision history for this message
David Ward (dpward) wrote :

There shouldn't be a problem here. The purpose of saned is to share scanners that are physically attached to the local system, so that remote systems can use them. If the scanner is already accessible over the network, a remote system can connect to it without using saned.

See also /usr/share/doc/libsane1/README.Debian.gz and /usr/share/doc/sane-utils/README.Debian regarding permissions for scanner device files and saned in Debian/Ubuntu.

Changed in sane-backends (Ubuntu):
status: Confirmed → Invalid
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