Canon printer drivers (cnijfilter)


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Canon provides source code for cups driver, but with some proprietary binary libs.

This libs available only for x86. No way for direct compiling cnijfilter for ARM (and other architectures). :(

 

But we have qemu! We can transparently run x86 executables on any other host architectures.

 

Easy steps to run cnijfilter on ARM (or any other arch):
- Build https://github.com/endlessm/cnijfilter-common for x86

- Copy all needed x86 libs using recursive ldd. And copy it to /usr/lib/bjlib/

- Patch all executables: set interpreter to /usr/lib/bjlib/x86/ld-linux.so.2 and rpath to /usr/lib/bjlib/

- Install these patched packages to ARM system

- Install qemu-user and qemu-user-binfmt (or qemu-arm-static)

 

You do not need to do this manually. I have implemented an automated build system: https://github.com/Azq2/cnijfilter-arm-build

 

All you need is any x86 machine to do the build.

 

How to use

1. On any x86 machine:

 

# Install dependencies
sudo apt install debootstrap git util-linux

# Get build system
git clone https://github.com/Azq2/cnijfilter-arm-build

# Start building
cd cnijfilter-arm-build
sudo ./build.sh build

# Get .deb packages
ls -lah ./result/full
ls -lah ./result/light

 

After build we have two variants of packages: full and light

 

Item Full Light

PPD files

+ +

CUPS filters

+ +

CUPS backends

+ -
lgmon + -

canon-maintenance

+ -
cngpij + -
cngpijmnt + -
cnijlgmon2 + -
cnijnetprn + -
cnijnpr + -
docs + -

 

In most cases, a light package is completely sufficient:

- We don't need canon usb backend, because cups have builtin USB support

- We don't need canon network backend, because cups have builtin BJNP support (package cups-backend-bjnp)

- Other canon maintenance utils are useless (in my opinion)

 

2. Copy .deb from result/light or result/full to your ARM machine.

 

3. On your ARM machine:

 

# Install dependencies
sudo apt install qemu-user qemu-user-binfmt # or sudo apt install qemu-user-static

# Install common for all printers package
sudo dpkg -i cnijfilter-common.deb

# Install printer-specific package
# Choose right package for your printer! e400series only for reference!
sudo dpkg -i cnijfilter-e400series.deb

 

4. Done. You can now configure CUPS.

 

Security with apparmor (optional)

 

CUPS filters don't need any specific permissions.

 

Create file /etc/apparmor.d/cnijfilter-filters with contents:

 

#include <tunables/global>

/usr/bin/bjfilter* {
	#include <abstractions/base>
	@{PROC}/sys/vm/mmap_min_addr r,
}

/usr/bin/cif[a-z]*[0-9d]* {
	#include <abstractions/base>
	@{PROC}/sys/vm/mmap_min_addr r,
}

/usr/lib/cups/filter/{cmdtocanonij,pstocanonbj,pstocanonij} {
	#include <abstractions/base>
	@{PROC}/sys/vm/mmap_min_addr r,
}

 

Then restart apparmor:

 

sudo systemctl reload apparmor
sudo aa-enforce cnijfilter-filters

 

Note: this minimal file full coverage all executables in light package. For full package you need write additional rules by yourself.

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