USB printers in the network (ipp-usb, p910nd)

.github/workflows/build.yml

@@ -48,6 +48,8 @@ jobs:
         run: tests/test-bootlog.sh
       - name: Power schedule (shareos-power)
         run: LD_LIBRARY_PATH="$HOME/hostroot/lib" tests/test-power.sh "$HOME/hostroot/bin"
+      - name: Printers (shareos-printer with a fake /sys, ipp-usb and p910nd)
+        run: LD_LIBRARY_PATH="$HOME/hostroot/lib" tests/test-printer.sh "$HOME/hostroot/bin"
       - name: Dynamic DNS (shareos-ddns, all providers with a fake curl)
         run: LD_LIBRARY_PATH="$HOME/hostroot/lib" tests/test-ddns.sh "$HOME/hostroot/bin"
       - name: Zabbix agent controller (settings, disk/RAID items)

CHANGELOG.md

@@ -6,6 +6,10 @@ pre-releases for test devices only.
 
 ## 0.2.0-beta.18
 
+- **USB printers in the network** (Dienste → Drucker, new system app **"printer"** in the store: ipp-usb 0.9.34 + p910nd 0.97, 3 MB).
+  - *Current printers and multifunction devices* that speak IPP over USB (most since about 2015, e.g. HP Smart Tank, OfficeJet, Canon PIXMA, Epson EcoTank) print **without a driver**: Windows 10/11, macOS, iPhone/iPad and Android find them by themselves (IPP Everywhere, AirPrint, Mopria) – and their **scanner** works over the network as well (eSCL). ipp-usb (OpenPrinting) does the work; ShareOS's avahi-daemon has no D-Bus, so a patch makes ipp-usb announce the devices through static avahi service files. The port of each device stays the same (kept on the flash).
+  - *Older printers* (usblp, `/dev/usb/lpN`): p910nd on port 9100 + N, announced as `_pdl-datastream`; the computer uses the maker's driver ("Standard TCP/IP port" in Windows, AppSocket/JetDirect). *Testseite* sends a plain-text/PCL page.
+  - Printers are followed when plugged in or pulled (mdev rule for `lp*`, ipp-usb watches USB itself). Mode *Immer Port 9100* for printers whose driverless printing misbehaves. `shareos-printer`, rpcd `shareos.printer`, `tests/test-printer.sh` (14 checks with a fake /sys).
 - **DynDNS, own certificate authority and Let's Encrypt** (System → Netzwerk).
   - *DynDNS*: DuckDNS, dynv6, Cloudflare, No-IP or any dyndns2 address (Strato, IONOS, …), IPv4 and/or IPv6 (for lines without their own IPv4 address: DS-Lite, fibre, mobile). The box reports its public address every 5 minutes when it changed, otherwise once a day; a failure becomes a message. Token and password go to curl through stdin, not the command line, and are never sent back to the browser. `shareos-ddns`, `tests/test-ddns.sh` (24 checks with a fake curl).
   - *Own CA*: a certificate authority on the box (EC P-256, 10 years) issues certificates for the box and other devices in the home network (825 days, server authentication, wildcards like `*.home.lan`, IP addresses); its root certificate is installed once on PCs and phones, after that there are no certificate warnings. The box's own certificate follows name and IP address and is renewed 30 days before it runs out. The CA is part of the settings backup. `shareos-ca` (mbedtls of the firmware), `tests/test-ca.sh` (18 checks, in CI with the firmware's programs in qemu).

CLAUDE.md

@@ -6,7 +6,7 @@
 - Tags/releases are created by Jan; prepare the release text and the `CHANGELOG.md` section.
 - **Every release updates the docs** – see `docs/RELEASE.md` (CHANGELOG, README status/features, TESTEN/TESTING, ENTWICKLUNG/DEVELOPMENT).
 - Photos for the docs: strip EXIF/GPS and blur serial-number stickers before committing.
-- Tests: `tests/` (host: test-update, test-net, test-flash-bin, test-boards, test-raid-wait, test-smart, test-bootlog, test-power, test-notify, test-zabbix-items, test-ddns, test-ca (mbedtls/uci of the firmware through qemu-arm-static, see build.yml), check-acl.py, check-i18n.py; ARM emulator with sudo: run-stack-qemu --check, test-users, test-storage, test-cloud-paperless, test-apps, test-firstinstall, test-transmission, test-media, test-dlna, test-vpn, test-tailscale, test-autobrr, test-zabbix – these seven need `make sysapps-pack`, test-snapshots, test-sysperms). UI work: `tests/mock-ubus.py`; app SDK in Chromium: `node tests/sdk-storage.js` (Playwright). ucode plugin: `tests/check-ucode-order.py` (no hoisting in ucode).
+- Tests: `tests/` (host: test-update, test-net, test-flash-bin, test-boards, test-raid-wait, test-smart, test-bootlog, test-power, test-notify, test-zabbix-items, test-printer, test-ddns, test-ca (mbedtls/uci of the firmware through qemu-arm-static, see build.yml), check-acl.py, check-i18n.py; ARM emulator with sudo: run-stack-qemu --check, test-users, test-storage, test-cloud-paperless, test-apps, test-firstinstall, test-transmission, test-media, test-dlna, test-vpn, test-tailscale, test-autobrr, test-zabbix – these seven need `make sysapps-pack`, test-snapshots, test-sysperms). UI work: `tests/mock-ubus.py`; app SDK in Chromium: `node tests/sdk-storage.js` (Playwright). ucode plugin: `tests/check-ucode-order.py` (no hoisting in ucode).
 - Never `rm -rf` a chroot that still has mounts below it (it would delete the host's /dev).
 - Apps live in the separate repository UniqueDroid/ShareOS-Apps.
 - New UI texts: add them to `i18n/en.json` and to every `tools/i18n/<code>.tsv` (new numbers at the end), then `tools/i18n/build-lang.py`; `tests/check-i18n.py` must pass.

Config.in

@@ -10,6 +10,7 @@ source "$BR2_EXTERNAL_SHAREOS_PATH/package/shareos-tailscale/Config.in"
 source "$BR2_EXTERNAL_SHAREOS_PATH/package/shareos-autobrr/Config.in"
 source "$BR2_EXTERNAL_SHAREOS_PATH/package/shareos-tuya/Config.in"
 source "$BR2_EXTERNAL_SHAREOS_PATH/package/shareos-zabbix-agent/Config.in"
+source "$BR2_EXTERNAL_SHAREOS_PATH/package/shareos-ipp-usb/Config.in"
 
 endmenu
 

README.md

@@ -76,6 +76,7 @@ Version in brackets = first release with the feature.
 - **USB sticks and disks:** mounted at `/mnt/usb-<name>` when plugged in (FAT32, exFAT, NTFS, ext4, Btrfs), **Safely remove**, **Format** with exFAT, FAT32, NTFS or ext4 (beta.7)
 
 **Shares, users, files**
+- USB printers in the network: current printers without a driver (IPP over USB: AirPrint, Mopria, Windows), scanning over the network (eSCL), older printers over port 9100 (system app "printer", 0.2.0-beta.18)
 - SMB 2/3 (ksmbd) and NFS v4 shares with read/write permissions per user and group, guest access optional; the crypto engine of the SoC computes the SMB 3 signatures (about three times as fast, 0.2.0-beta.17); compatibility mode up to SMB 2.1 for difficult clients (0.2.0-beta.17)
 - Users and groups; one account for shares, web interface and apps; storage limit per user (ext4); import of Alt-F users with their passwords
 - "My ShareOS": users with web access manage their own password, look, shares, storage, cloud and Paperless

board/dlink/dns320l/post-build.sh

@@ -79,6 +79,9 @@ done
 # (shareos-usb ignores the internal SATA disks)
 grep -q shareos-usb "$TARGET_DIR/etc/mdev.conf" || \
 	printf 'sd[a-z][0-9]*\troot:disk 660 */usr/sbin/shareos-usb hotplug\n' >> "$TARGET_DIR/etc/mdev.conf"
+# USB printers (usblp, /dev/usb/lpN): the printer service follows them
+grep -q shareos-printer "$TARGET_DIR/etc/mdev.conf" || \
+	printf 'lp[0-9]*\troot:lp 660 */usr/sbin/shareos-printer hotplug\n' >> "$TARGET_DIR/etc/mdev.conf"
 
 # ntfs-3g: only mkntfs/ntfslabel are used (mounting goes through the kernel's ntfs3)
 for p in ntfs-3g ntfs-3g.probe lowntfs-3g ntfscat ntfscluster ntfscmp ntfsfix ntfsinfo ntfsls \

configs/shareos_sysapps_defconfig

@@ -49,6 +49,11 @@ BR2_PACKAGE_SHAREOS_AUTOBRR=y
 # Zabbix agent, classic C version (system app "zabbix-agent"), see
 # package/shareos-zabbix-agent
 BR2_PACKAGE_SHAREOS_ZABBIX_AGENT=y
+# printer (system app "printer"): IPP over USB for current printers and
+# scanners (driverless), p910nd (port 9100, raw) for older ones, see
+# package/shareos-ipp-usb
+BR2_PACKAGE_SHAREOS_IPP_USB=y
+BR2_PACKAGE_P910ND=y
 BR2_PACKAGE_HTOP=y
 BR2_PACKAGE_STRACE=y
 BR2_PACKAGE_IPERF3=y

package/shareos-core/shareos-core.mk

@@ -77,6 +77,7 @@ define SHAREOS_CORE_INSTALL_TARGET_CMDS
 	$(INSTALL) -D -m 0644 $(@D)/etc/config/dockerhosts $(TARGET_DIR)/etc/config/dockerhosts
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-dlna $(TARGET_DIR)/usr/sbin/shareos-dlna
 	$(INSTALL) -D -m 0644 $(@D)/etc/config/dlna $(TARGET_DIR)/etc/config/dlna
+	$(INSTALL) -D -m 0644 $(@D)/etc/config/printer $(TARGET_DIR)/etc/config/printer
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-zabbix $(TARGET_DIR)/usr/sbin/shareos-zabbix
 	$(INSTALL) -D -m 0644 $(@D)/etc/config/zabbix $(TARGET_DIR)/etc/config/zabbix
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-reset-access $(TARGET_DIR)/usr/sbin/shareos-reset-access
@@ -89,6 +90,7 @@ define SHAREOS_CORE_INSTALL_TARGET_CMDS
 	$(INSTALL) -D -m 0755 $(@D)/etc/init.d/rcS $(TARGET_DIR)/etc/init.d/rcS
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-bootlog $(TARGET_DIR)/usr/sbin/shareos-bootlog
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-power $(TARGET_DIR)/usr/sbin/shareos-power
+	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-printer $(TARGET_DIR)/usr/sbin/shareos-printer
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-ddns $(TARGET_DIR)/usr/sbin/shareos-ddns
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-ca $(TARGET_DIR)/usr/sbin/shareos-ca
 	$(INSTALL) -D -m 0755 $(@D)/usr/sbin/shareos-acme $(TARGET_DIR)/usr/sbin/shareos-acme