108 lines
4.0 KiB
Bash
Executable File
108 lines
4.0 KiB
Bash
Executable File
#!/bin/bash
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deviceinfo_name="Armbian USB Gadget Network"
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deviceinfo_manufacturer="Armbian"
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#deviceinfo_usb_idVendor=
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#deviceinfo_usb_idProduct=
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#deviceinfo_usb_serialnumber=
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setup_usb_network_configfs() {
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# See: https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt
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CONFIGFS=/sys/kernel/config/usb_gadget
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if ! [ -e "$CONFIGFS" ]; then
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echo " $CONFIGFS does not exist, skipping configfs usb gadget"
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return
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fi
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# Default values for USB-related deviceinfo variables
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usb_idVendor="${deviceinfo_usb_idVendor:-0x18D1}" # default: Google Inc.
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usb_idProduct="${deviceinfo_usb_idProduct:-0xD001}" # default: Nexus 4 (fastboot)
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usb_serialnumber="${deviceinfo_usb_serialnumber:-postmarketOS}"
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usb_network_function="rndis.0"
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echo " Setting up an USB gadget through configfs"
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# Create an usb gadet configuration
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mkdir $CONFIGFS/g1 || echo " Couldn't create $CONFIGFS/g1"
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echo "$usb_idVendor" > "$CONFIGFS/g1/idVendor"
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echo "$usb_idProduct" > "$CONFIGFS/g1/idProduct"
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# Create english (0x409) strings
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mkdir $CONFIGFS/g1/strings/0x409 || echo " Couldn't create $CONFIGFS/g1/strings/0x409"
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# shellcheck disable=SC2154
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echo "$deviceinfo_manufacturer" > "$CONFIGFS/g1/strings/0x409/manufacturer"
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echo "$usb_serialnumber" > "$CONFIGFS/g1/strings/0x409/serialnumber"
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# shellcheck disable=SC2154
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echo "$deviceinfo_name" > "$CONFIGFS/g1/strings/0x409/product"
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# Create network function.
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mkdir $CONFIGFS/g1/functions/"$usb_network_function" ||
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echo " Couldn't create $CONFIGFS/g1/functions/$usb_network_function"
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# Create configuration instance for the gadget
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mkdir $CONFIGFS/g1/configs/c.1 ||
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echo " Couldn't create $CONFIGFS/g1/configs/c.1"
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mkdir $CONFIGFS/g1/configs/c.1/strings/0x409 ||
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echo " Couldn't create $CONFIGFS/g1/configs/c.1/strings/0x409"
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echo "USB network" > $CONFIGFS/g1/configs/c.1/strings/0x409/configuration ||
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echo " Couldn't write configration name"
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# Link the network instance to the configuration
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ln -s $CONFIGFS/g1/functions/"$usb_network_function" $CONFIGFS/g1/configs/c.1 ||
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echo " Couldn't symlink $usb_network_function"
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echo 0xEF > $CONFIGFS/g1/functions/"$usb_network_function"/class ||
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echo " Couldn't write class"
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echo 0x04 > $CONFIGFS/g1/functions/"$usb_network_function"/subclass ||
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echo " Couldn't write subclass"
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echo 0x01 > $CONFIGFS/g1/functions/"$usb_network_function"/protocol ||
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echo " Couldn't write protocol"
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echo 0xEF > $CONFIGFS/g1/bDeviceClass ||
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echo " Couldn't write g1 class"
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echo 0x04 > $CONFIGFS/g1/bDeviceSubClass ||
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echo " Couldn't write g1 subclass"
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echo 0x01 > $CONFIGFS/g1/bDeviceProtocol ||
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echo " Couldn't write g1 protocol"
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# Check if there's an USB Device Controller
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if [ -z "$(ls /sys/class/udc)" ]; then
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echo " No USB Device Controller available"
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return
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fi
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# Link the gadget instance to an USB Device Controller. This activates the gadget.
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# See also: https://github.com/postmarketOS/pmbootstrap/issues/338
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# shellcheck disable=SC2005
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echo "$(ls /sys/class/udc)" > $CONFIGFS/g1/UDC || echo " Couldn't write UDC"
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}
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set_usbgadget_ipaddress() {
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local host_ip="${unudhcpd_host_ip:-172.16.42.1}"
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local client_ip="${unudhcpd_client_ip:-172.16.42.2}"
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echo "Starting dnsmasq with server ip $host_ip, client ip: $client_ip"
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# Get usb interface
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INTERFACE=""
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ip a add "${host_ip}/255.255.0.0" dev rndis0 2> /dev/null && ip link set rndis0 up && INTERFACE=rndis0
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if [ -z $INTERFACE ]; then
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ip a add "${host_ip}/255.255.0.0" dev usb0 2> /dev/null && ip link set usb0 up && INTERFACE=usb0
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fi
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if [ -z $INTERFACE ]; then
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ip a add "${host_ip}/255.255.0.0" dev eth0 2> /dev/null && eth0 && INTERFACE=eth0
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fi
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if [ -z $INTERFACE ]; then
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echo " Could not find an interface to run a dhcp server on"
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echo " Interfaces:"
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ip link
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return
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fi
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echo " Using interface $INTERFACE"
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echo " Starting the DHCP daemon"
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ip a show $INTERFACE > /var/log/unudhcpd.log
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nohup /usr/bin/unudhcpd -i "$INTERFACE" -s "$host_ip" -c "$client_ip" 2>&1 >> /var/log/unudhcpd.log &
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}
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setup_usb_network_configfs
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set_usbgadget_ipaddress
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