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Frautoincnam
Apprentice
Joined: 19 May 2017
Posts: 294
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 Posted: Thu Jun 24, 2021 7:43 pm Post subject: [SOLVED] HP officejet and scanner |
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Hi,
I have a server with a USB scanner connected, saned works and find my USB scanner (Epson).
On my clients, I juste have sane-backends and server hostname in /etc/saned/net.conf
On my server, I have cups working too, and using a network wireless HP printer (HP6100, no scanner)
All is fine here for years.
I just bought a HP Officejet pro 8023.
Cups found it, and I could add it to printers. All is ok here too.
I've managed to get my server seeing the scanner :
| Code: | # scanimage -L
device `hpaio:/net/HP_OfficeJet_Pro_8020_series?ip=192.168.5.198' is a Hewlett-Packard HP_OfficeJet_Pro_8020_series all-in-one
device `genesys:libusb:001:002' is a Canon LiDE 120 flatbed scanner |
but I can't get my clients seeing it, over my server saned :
| Code: | $ scanimage -L
device `net:sane.novazur.fr:genesys:libusb:001:002' is a Canon LiDE 120 flatbed scanner |
Everything I tried were unsuccessful.
I would not have to install hplip and certainly not to start saned on the client.
Any idea please ?
[SOLVED] hplip need to be patched to make sane hpaio net discovering. See below
Last edited by Frautoincnam on Fri Jun 25, 2021 1:50 pm; edited 1 time in total |
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Frautoincnam
Apprentice
Joined: 19 May 2017
Posts: 294
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| Posted: Thu Jun 24, 2021 8:07 pm Post subject: |
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I can get it on the client by installing hplip with the USE scanner and snmp but, I think it doesn't go through the saned server saned.
| Code: | $ scanimage -L
device `hpaio:/net/HP_OfficeJet_Pro_8020_series?ip=192.168.5.198' is a Hewlett-Packard HP_OfficeJet_Pro_8020_series all-in-one
device `net:sane.novazur.fr:genesys:libusb:001:002' is a Canon LiDE 120 flatbed scanner |
I don't really know if it's worse or not.
And I find that it doesn't necessarily make a lot of sense to have to install hplip on every client.
What do you think please? |
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figueroa
Advocate
Joined: 14 Aug 2005
Posts: 2964
Location: Edge of marsh USA
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| Posted: Fri Jun 25, 2021 4:06 am Post subject: |
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I think it makes perfect sense. Don't need saned on the client, but if you want to process the scan on the client, you need the software for each scanner on the clients. Are your clients remote to the server? Seeing the full domain name of the server in the scanimage -L output seemed strange. Here is mine, server is hostname "bethel" and client is on the LAN with the server.
| Code: | $ scanimage -L
device `v4l:/dev/video0' is a Noname VGA Single Chip virtual device
device `net:bethel:epkowa:interpreter:002:004' is a Epson Perfection V500 flatbed scanner
device `net:bethel:epkowa:interpreter:002:004' is a Epson Perfection V500 flatbed scanner
device `net:bethel:hpaio:/usb/HP_LaserJet_3055?serial=00CNRK255240' is a Hewlett-Packard HP_LaserJet_3055 all-in-one |
I think the Epson scanner is being recognized by both the net.conf and dll.conf. I get FOUR of them on the server; need some fine tuning. 
_________________
Andy Figueroa
hp pavilion hpe h8-1260t/2AB5; spinning rust x3
i7-2600 @ 3.40GHz; 16 gb; Radeon HD 7570
amd64/23.0/split-usr/desktop (stable), OpenRC, -systemd -pulseaudio -uefi |
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pa4wdh
l33t
Joined: 16 Dec 2005
Posts: 812
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| Posted: Fri Jun 25, 2021 5:22 am Post subject: |
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By default the sane backend (i guess you are using hpaio at your server, provided by the hplip package) only makes it available to the sane server, it is set "local only" which means it doesn't get redistributed to other clients which connect to the server over the network.
I only way to change this that i'm aware of is with a small user patch I have for hplip. The latest version I have is for hplip-3.20.6 and saved in /etc/portage/patches/net-print/hplip-3.20.6/localOnly.patch:
| Code: | diff -Naur hplip-3.20.6-org/scan/sane/hpaio.c hplip-3.20.6/scan/sane/hpaio.c
--- hplip-3.20.6-org/scan/sane/hpaio.c 2020-06-18 15:07:36.000000000 +0200
+++ hplip-3.20.6/scan/sane/hpaio.c 2020-10-27 23:08:41.729986029 +0100
@@ -368,7 +368,7 @@
{
DBG(8, "sane_hpaio_get_devices(local=%d): %s %d\n", localOnly, __FILE__, __LINE__);
ResetDeviceList(&DeviceList);
- DevDiscovery(localOnly);
+ DevDiscovery(0);
*deviceList = (const SANE_Device **)DeviceList;
SANE_Device*** devList;
orblite_get_devices(devList, localOnly); |
This forces "localOnly" to 0, effectively allowing network clients to use the scanner. If anyone has a better idea than to do this with a patch, please let me know
_________________
The gentoo way of bringing peace to the world:
USE="-war" emerge --newuse @world
My shared code repository: https://code.pa4wdh.nl.eu.org
Music, Free as in Freedom: https://www.jamendo.com |
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Frautoincnam
Apprentice
Joined: 19 May 2017
Posts: 294
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| Posted: Fri Jun 25, 2021 1:48 pm Post subject: |
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| pa4wdh wrote: | | By default the sane backend (i guess you are using hpaio at your server, provided by the hplip package) only makes it available to the sane server, it is set "local only" which means it doesn't get redistributed to other clients which connect to the server over the network. |
Awesome !
You give me THE solution and in addition you prove that I am not crazy and that my reasoning holds up.
You are my savior !
Thank you so much.
After adding patch to server hplip, from the client :
| Code: | $ scanimage -L
device `hpaio:/net/HP_OfficeJet_Pro_8020_series?ip=192.168.5.198' is a Hewlett-Packard HP_OfficeJet_Pro_8020_series all-in-one
device `net:sane.novazur.fr:hpaio:/net/HP_OfficeJet_Pro_8020_series?ip=192.168.5.198' is a Hewlett-Packard HP_OfficeJet_Pro_8020_series all-in-one
device `net:sane.novazur.fr:genesys:libusb:001:002' is a Canon LiDE 120 flatbed scanner |
After removing hplip on the client :
| Code: | $ scanimage -L
device `net:sane.novazur.fr:hpaio:/net/HP_OfficeJet_Pro_8020_series?ip=192.168.5.198' is a Hewlett-Packard HP_OfficeJet_Pro_8020_series all-in-one
device `net:sane.novazur.fr:genesys:libusb:001:002' is a Canon LiDE 120 flatbed scanner |
This could be a very usefull choice option when compiling hplip. |
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pa4wdh
l33t
Joined: 16 Dec 2005
Posts: 812
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| Posted: Fri Jun 25, 2021 2:17 pm Post subject: |
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I'm glad i could help, and no, you are not crazy 
When i had this problem I could find discussions about that is reasonable to expect from saned point of view (if it's networked, don't pass it on to networked clients, probably to prevent loops) and from user point of view (it's connected to my server and i want to use it from my client).
Keep in mind that you'll have to patch hplip again when it updates, my experience in doing this for a few years now is that it's not hard but annoying , sometimes there are other changes to the same file and the patch has to be changed.
Maybe it's nice to have a patch like this distributed with the ebuild and a use flag to control if it's applied
_________________
The gentoo way of bringing peace to the world:
USE="-war" emerge --newuse @world
My shared code repository: https://code.pa4wdh.nl.eu.org
Music, Free as in Freedom: https://www.jamendo.com |
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Frautoincnam
Apprentice
Joined: 19 May 2017
Posts: 294
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| Posted: Fri Jun 25, 2021 2:33 pm Post subject: |
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| pa4wdh wrote: | | I'm glad i could help, and no, you are not crazy |
| Quote: | | When i had this problem I could find discussions about that is reasonable to expect from saned point of view (if it's networked, don't pass it on to networked clients, probably to prevent loops) and from user point of view (it's connected to my server and i want to use it from my client). |
I did find these answers after yours, but never before. Probably because of my badly turned request.
| Quote: | | Keep in mind that you'll have to patch hplip again when it updates, my experience in doing this for a few years now is that it's not hard but annoying , sometimes there are other changes to the same file and the patch has to be changed. |
Do not worry about that
I just put it in /etc/portage/patches/net-print/hplip
| Code: | # cat /etc/portage/patches/net-print/hplip/hpaio_net_discorery.patch
diff -ur hplip-3.20.11.orig/scan/sane/hpaio.c hplip-3.20.11/scan/sane/hpaio.c
--- hplip-3.20.11.orig/scan/sane/hpaio.c 2020-11-29 20:03:52.000000000 -0400
+++ hplip-3.20.11/scan/sane/hpaio.c 2021-06-25 09:26:11.786204535 -0400
@@ -376,7 +376,7 @@
{
DBG(8, "sane_hpaio_get_devices(local=%d): %s %d\n", localOnly, __FILE__, __LINE__);
ResetDeviceList(&DeviceList);
- DevDiscovery(localOnly);
+ DevDiscovery(0);
*deviceList = (const SANE_Device **)DeviceList;
SANE_Device*** devList;
orblite_get_devices(devList, localOnly);
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And if it makes problem with futures versions, I'll adapt it easyly.
| Quote: | | Maybe it's nice to have a patch like this distributed with the ebuild and a use flag to control if it's applied |
That's what I mean.
Thanks again ! |
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 21630
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| Posted: Fri Jun 25, 2021 4:35 pm Post subject: |
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| This seems like the kind of option that should be configurable via a preferences file, rather than built into the program. Is the value of the parameter localOnly forced from higher up, or can it be influenced with the right configuration change? |
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pa4wdh
l33t
Joined: 16 Dec 2005
Posts: 812
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| Posted: Fri Jun 25, 2021 4:54 pm Post subject: |
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I agree that would be the right thing to do, as far as i know it's not possible to do this with configuration. I only wrote the patch because i didn't see an other solution
_________________
The gentoo way of bringing peace to the world:
USE="-war" emerge --newuse @world
My shared code repository: https://code.pa4wdh.nl.eu.org
Music, Free as in Freedom: https://www.jamendo.com |
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Frautoincnam
Apprentice
Joined: 19 May 2017
Posts: 294
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| Posted: Fri Jun 25, 2021 4:55 pm Post subject: |
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| Hu wrote: | | This seems like the kind of option that should be configurable via a preferences file, rather than built into the program. |
It would indeed be the ideal solution
| Quote: | | Is the value of the parameter localOnly forced from higher up, or can it be influenced with the right configuration change? |
I hope you're not asking me the question
In none of the discussions on the subject did I see the possibility of a run option and not a build option. |
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Hu
Moderator
Joined: 06 Mar 2007
Posts: 21630
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| Posted: Fri Jun 25, 2021 5:18 pm Post subject: |
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| The code snippet from pa4wdh shows that the value is a parameter to the function. Without digging into the code, it's not clear whether that parameter is hardcoded in the parent function, or passed down from somewhere that it could be configured. |
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pa4wdh
l33t
Joined: 16 Dec 2005
Posts: 812
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| Posted: Fri Jun 25, 2021 8:18 pm Post subject: |
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I also haven't checked the complete code, but the documentation doesn't mention it as a configuration option or commandline argument.
_________________
The gentoo way of bringing peace to the world:
USE="-war" emerge --newuse @world
My shared code repository: https://code.pa4wdh.nl.eu.org
Music, Free as in Freedom: https://www.jamendo.com |
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GDH-gentoo
Veteran
Joined: 20 Jul 2019
Posts: 1530
Location: South America
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| Posted: Sat Jun 26, 2021 3:25 pm Post subject: |
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| Hu wrote: | | [...] it's not clear whether that parameter is hardcoded in the parent function, or passed down from somewhere that it could be configured. |
TL;DR it looks like it is hardcoded in the parent function.
As far as I can tell, sane_hpaio_get_devices() is a function of backend library libsane-hpaio. Library libsane from sane-backends loads libsane-hpaio using dlopen(), function sane_get_devices() from libsane calls sane_dll_get_devices(), and that iterates over all loaded backend libraries, calling their corresponding sane_<BACKEND_NAME>_get_devices() function.
Then, saned calls sane_get_devices() with localOnly == SANE_TRUE, and scanimage calls sane_get_devices() with localOnly == SANE_FALSE.
include/sane/sane.h
| Code: | #define SANE_FALSE 0
#define SANE_TRUE 1 |
frontend/saned.c
| Code: | static int
process_request (Wire * w)
{
// ...
switch (current_request)
{
case SANE_NET_GET_DEVICES:
{
// ...
reply.status =
sane_get_devices ((const SANE_Device ***) &reply.device_list,
SANE_TRUE);
// ...
}
break;
// ...
}
return 0;
} |
frontend/scanimage.c
| Code: | int
main (int argc, char **argv)
{
// ...
while ((ch = getopt_long (argc, argv, "-" BASE_OPTSTRING, basic_options,
&index)) != EOF)
{
switch (ch)
{
// ...
case 'L':
case 'f':
{
// ...
status = sane_get_devices (&device_list, SANE_FALSE);
// ...
break;
}
// ...
}
}
// ...
} |
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