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docs:guide-user:base-system:hotplug [2023/10/03 22:25] – [Get specific IP address] update vgaeteradocs:guide-user:base-system:hotplug [2024/08/23 10:25] – Avoid duplication/duplicate execution oliv3r
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 ====== Hotplug ====== ====== Hotplug ======
-Procd (the init system and process management daemon) executes scripts located in ''/etc/hotplug.d/'' when certain events happen, like for example when an interface goes up or down, when a new storage drive is detected, or when a button is pressed.+Procd (the init system and process management daemon) executes scripts located in ''/etc/hotplug.d'' when certain events happen, like for example when an interface goes up or down, when a new storage drive is detected, or when a button is pressed.
 It can be very useful with PPPoE connection or in an unstable network, or to use hardware buttons. It can be very useful with PPPoE connection or in an unstable network, or to use hardware buttons.
  
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 Which is why most scripts in there use a numeric prefix. Which is why most scripts in there use a numeric prefix.
  
-^ Directory ^ Description ^ +^ Directory     ^ Description                                                                                               
-| **block** | Block device events: device connected/disconnected | +| **block**     | Block device events: device connected/disconnected                                                        
-| **button** | Buttons: not created by default, see [[docs:guide-user:hardware:hardware.button|/etc/rc.button]] instead | +| **button**    | Buttons: not created by default, see [[docs:guide-user:hardware:hardware.button|/etc/rc.button]] instead  
-| **dhcp** | DHCP-related events | +| **dhcp**      | DHCP-related events                                                                                       
-| **dsl** | DSL modem events | +| **dsl**       | DSL modem events                                                                                          
-| **firewall** | Firewall-related events | +| **firewall**  | Firewall-related events                                                                                   
-| **iface** | Interface events: LAN/WAN/etc. is connected/disconnected | +| **iface**     | Interface events: LAN/WAN/etc. is connected/disconnected                                                  
-| **neigh** | Neighbor discovery | +| **neigh**     | Neighbor discovery                                                                                        
-| **net** | Network-related events | +| **net**       | Network-related events                                                                                    
-| **ntp** | Time sync events: time step, time server stratum change | +| **ntp**       | Time sync events: time step, time server stratum change                                                   
-| **tftp** | TFTP-related events | +| **tftp**      | TFTP-related events                                                                                       | 
-| **usb** | USB devices like 3g-modem and tty* |+| **tty**       | TTY-related events, including but not limited to WWAN modems, but pointing directly to TTY interface      
 +| **usb**       | USB devices like 3g-modem and tty*                                                                        | 
 +| **usbmisc**   | Special USB peripherals like printers (scripts in this subsystem have fewer variables available)          |
  
 See also: See also:
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 ===== Event classes / Directories ===== ===== Event classes / Directories =====
 +==== net ====
 +For scripts in **net** directory, these are the (relevant) environmental variables
 +
 +^ Variable name ^ Description ^ 
 +| ACTION | "add" or "remove" noted |
 +| DEVICENAME | configured interface names (br-lan, wlan0, phy1-ap0 |
 +| PATH | Full path |
 +| DEVPATH | full device path (for example "/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.0/host7/target7:0:0/7:0:0:0/block/sdc/sdc1 " |
 +| DEVTYPE | what the DEVICENAME are names of, ie. br-lan, phy1-ap0 |
 +| INTERFACE | configured interfaces as in DEVTYPE |
 +| SEQNUM | seqnum (a number) |
 +| SUBSYSTEM | always = "net" |
 +| IFINDEX | appears to be related to the configured interfaces. See `ifconfig` |
 +
 ==== block ==== ==== block ====
 For scripts in **block** directory, these are the (relevant) environmental variables For scripts in **block** directory, these are the (relevant) environmental variables
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 | poll_interval | ntp variables | | poll_interval | ntp variables |
  
-Even without NTP sync, you will receive a "periodic" hotplug event, with stratum=16, about every 11 minutes out of the box.+Even without NTP sync, you will receive a "periodic" hotplug event, with ''stratum=16'', about every 11 minutes out of the box. 
 + 
 +==== tty ==== 
 +^ Variable name ^ description ^ 
 +| ACTION | add, remove, bind, unbind as above | 
 +| DEVICENAME | eg "ttyUSB2"
 +| DEVNAME | only for bind/unbind, eg, "ttyUSB2"
 +| DEVPATH | eg, "/devices/platform/ahb/1b400000.usb/usb2/2-1/2-1:1.3/ttyUSB2"
 +| SEQNUM | (action number since boot for this subsystem) eg 335 | 
 +| SUBSYSTEM | Specific type of device, eg, "usb-serial"
 +| MAJOR | eg 189 | 
 +| MINOR | eg 1 |
  
 ==== usb ==== ==== usb ====
 ^ Variable name ^ description ^ ^ Variable name ^ description ^
-| ACTION | add, remove as above | +| ACTION | add, remove, bindunbind as above |
-| DEVNAME | eg"bus/usb/001/002"+
-| DEVPATH | eg"/devices/platform/ehci-platform/usb1/1-1" |+
 | DEVICENAME | eg "1-1" | | DEVICENAME | eg "1-1" |
 +| DEVNAME | eg, "bus/usb/001/002" |
 | DEVNUM | eg 002 | | DEVNUM | eg 002 |
-DRIVER | "usb" |+DEVPATH eg, "/devices/platform/ehci-platform/usb1/1-1"
 +| DEVTYPE | eg "usb_device" |
 | TYPE | eg 9/0/1 | | TYPE | eg 9/0/1 |
 | PRODUCT | the vendor/productcode/version, eg "424/2640/0" see lsusb | | PRODUCT | the vendor/productcode/version, eg "424/2640/0" see lsusb |
-| SEQNUM | eg 335 |+| SEQNUM | (action number since boot for this subsystem) eg 335 |
 | BUSNUM | eg 001 | | BUSNUM | eg 001 |
 | MAJOR | eg 189 | | MAJOR | eg 189 |
 | MINOR | eg 1 | | MINOR | eg 1 |
 +
 +==== usbmisc ====
 +^ Variable name  ^ description                                             ^
 +| ACTION         | add, remove as above                                    |
 +| DEVNAME        | eg, "bus/usb/001/002"                                   |
 +| DEVPATH        | eg, "/devices/platform/ehci-platform/usb1/1-1"          |
 +| DEVICENAME     | eg "1-1"                                                |
 +| SEQNUM          (action number since boot for this subsystem) eg 335   |
 +| MAJOR          | eg 189                                                  |
 +| MINOR          | eg 1                                                    |
 +
  
 ===== Examples ===== ===== Examples =====
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 ==== Symlink instead of rename a device ==== ==== Symlink instead of rename a device ====
 An other script to create a symlink instead of renaming the device. An other script to create a symlink instead of renaming the device.
-I test if DEVICE_NAME is empty because when I plug usb device I retrieve two add event, and the first come before created device, so symlink fails. 
  
 <code bash> <code bash>
 cat << "EOF" > /etc/hotplug.d/usb/20-cp210x cat << "EOF" > /etc/hotplug.d/usb/20-cp210x
-CP210_PRODID="10c4/ea60/100"+CP210_PRODID='10c4/ea60/100'
 SYMLINK="my_link" SYMLINK="my_link"
  
-if [ "${PRODUCT}" = "${CP210_PRODID}" ]; then +set -eu
-    if [ "${ACTION}" = "add" ]; then +
-          DEVICE_NAME=$(ls /sys/${DEVPATH} | grep tty) +
-          if [ -z ${DEVICE_NAME} ]; then +
-              logger -t hotplug "Warning DEVICE_NAME is empty" +
-              exit 0 +
-          fi +
-          logger -t hotplug "Device name of cp210 is ${DEVICE_NAME}" +
-          ln -s /dev/${DEVICE_NAME} /dev/${SYMLINK} +
-          logger -t hotplug "Symlink from /dev/${DEVICE_NAME} to /dev/${SYMLINK} created" +
-    fi +
-fi+
  
-if [ "${PRODUCT}" = "${CP210_PRODID}" ]; then +if [ "${DEVTYPE:-}" = 'usb_interface' ] && \ 
-    if [ "${ACTION}" = "remove" ]; then +   [ "${PRODUCT:-}" = "${CP210_PRODID}" ]; then 
-        rm /dev/${SYMLINK} + if [ "${ACTION:-}" = 'bind' ]; then 
-        logger -t hotplug "Symlink /dev/${SYMLINK} removed" + if [ -L "/dev/${SYMLINK}" ]; then 
-    fi+ logger -t hotplug "Symlink '/dev/${SYMLINK}' already exists" 
 + exit 0 
 + fi 
 + 
 + DEVICE_NAME="$(find /sys${DEVPATH:-} -maxdepth 1 -type d -iname 'ttyUSB*' -exec basename {} \;)" 
 + if [ -z "${DEVICE_NAME}" ]; then 
 + logger -t hotplug 'Warning: DEVICE_NAME is empty' 
 + exit 0 
 + fi 
 + 
 + logger -t hotplug "Device name of cp210 is '${DEVICE_NAME}'" 
 + ln -s "/dev/${DEVICE_NAME}" "/dev/${SYMLINK}" 
 + logger -t hotplug "Symlink from '/dev/${DEVICE_NAME}' to '/dev/${SYMLINK}' created" 
 + fi 
 + 
 + 
 + if [ "${ACTION:-}" = 'unbind' ]; then 
 + rm "/dev/${SYMLINK}" 
 + logger -t hotplug "Symlink '/dev/${SYMLINK}removed" 
 + fi
 fi fi
 EOF EOF
 </code> </code>
- +==== Script that detects whether plugged usb device is bluetooth or not ====
-==== Script that detects if plugged usb device is bluetooth or not ====+
 <code bash> <code bash>
 cat << "EOF" > /etc/hotplug.d/usb/20-bt_test cat << "EOF" > /etc/hotplug.d/usb/20-bt_test
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     add)     add)
             # start process             # start process
-        /etc/init.d/mjpg-streamer start+        service mjpg-streamer start
             ;;             ;;
     remove)     remove)
             # stop process             # stop process
-        /etc/init.d/mjpg-streamer stop+        service mjpg-streamer stop
             ;;             ;;
 esac esac
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 ==== Coldplug ==== ==== Coldplug ====
-If you had notice the udev and eudev were removed in the openwrt 18.0.* release, don'be afraid because you still can make the things works.+You may have noticed that the udev and eudev were removed in the openwrt 18.0.* release. Don'worry, because you still can make things work.
 You can use hotplug scripts as coldplug. You can use hotplug scripts as coldplug.
-Pay attention at the ACTION environment variable, at the boot are executed 'bind' actions. +Pay attention to the ACTION environment variable, at boot 'bind' actions are executed
-So, just add this option to hotplug run accordinly.+So, just add this option to hotplug and run accordingly. 
 In my case I used this: In my case I used this:
  
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 </code> </code>
  
-Note that this example script assumes that channel bonding is not compiled in to the DSL support.+This script assumes that channel bonding is not compiled in to the DSL support.
  
 ==== Utilize wireless USB adapter ==== ==== Utilize wireless USB adapter ====
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 <code bash> <code bash>
 # lsusb -v # lsusb -v
-  idVendor           0x0bda Realtek Semiconductor Corp. + idVendor 0x0bda Realtek Semiconductor Corp. 
-  idProduct          0x8171 RTL8188SU 802.11n WLAN Adapter + idProduct 0x8171 RTL8188SU 802.11n WLAN Adapter 
-  bcdDevice            2.00+ bcdDevice 2.00
 </code> </code>
  
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 Assuming your ISP provides a dynamic IP address. Assuming your ISP provides a dynamic IP address.
 Reconnect until you get the one matching a specific regexp. Reconnect until you get the one matching a specific regexp.
-Match ''10'' in the first octet, or 2 digits in the 1-st octet and 3 digits in the 2-nd octet. 
 Delay for 10 seconds between reconnects. Delay for 10 seconds between reconnects.
 +Set up [[docs:guide-user:advanced:hotplug_extras|Hotplug extras]] to trigger the script upon connecting WAN interface.
  
 <code bash> <code bash>
-cat << "EOF" > /etc/hotplug.d/iface/10-wan-ipaddr +mkdir -p /etc/hotplug.d/online 
-if [ "${ACTION}" != "ifup" ] \ +cat << "EOF" > /etc/hotplug.d/online/10-wan-ipaddr
-&& [ "${ACTION}" != "ifupdate"+
-then exit 0 +
-fi +
-if [ "${ACTION}" = "ifupdate" ] \ +
-&& [ -z "${IFUPDATE_ADDRESSES}" ] \ +
-&& [ -z "${IFUPDATE_DATA}"+
-then exit 0 +
-fi+
 . /lib/functions/network.sh . /lib/functions/network.sh
 network_flush_cache network_flush_cache
-network_find_wan NET_IF +network_find_wan WAN_IF 
-network_get_ipaddr NET_ADDR "${NET_IF}" +network_get_ipaddr WAN_ADDR "${WAN_IF}" 
-if [ "${NET_IF}" != "${INTERFACE}" +if [ "${WAN_IF}" != "${INTERFACE}" ]
-then exit 0 +
-fi +
-if [ "${NET_ADDR%%.*}" = "10" ] \ +
-|| [[ "${NET_ADDR}" =~ "^[0-9]{2}[.][0-9]{3}[.]" ]]+
 then exit 0 then exit 0
 fi fi
 +case ${WAN_ADDR} in
 +(??.???.*) exit 0 ;;
 +esac
 sleep 10 sleep 10
-ifup "${NET_IF}"+ifup ${INTERFACE}
 EOF EOF
 </code> </code>
  
 ==== Rename interfaces by MAC address ==== ==== Rename interfaces by MAC address ====
-A simple method to configure persistent interface names by MAC address.+Assuming pre-configured upstream interfaces ''wana'' and ''wanb''
 +Set up persistent interface names by MAC address.
  
 <code bash> <code bash>
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 dev_rename() { dev_rename() {
 local DEV_CONF="${1}" local DEV_CONF="${1}"
-local DEV_ONAME DEV_NAME DEV_MAC +local DEV_MAC DEV_NAME DEV_ONAME
-config_get DEV_NAME "${DEV_CONF}" name+
 config_get DEV_MAC "${DEV_CONF}" mac config_get DEV_MAC "${DEV_CONF}" mac
 +config_get DEV_NAME "${DEV_CONF}" name
 DEV_ONAME="$(grep -l -e "${DEV_MAC}" \ DEV_ONAME="$(grep -l -e "${DEV_MAC}" \
 $(find /sys/class/net/*/device/uevent \ $(find /sys/class/net/*/device/uevent \
 | sed -e "s|/device/uevent$|/address|") \ | sed -e "s|/device/uevent$|/address|") \
 | awk -F '/' '{print $5}')" | awk -F '/' '{print $5}')"
-if [ "${DEV_ONAME}" != "${DEV_NAME}" ]+if [ -n "${DEV_MAC}" ] \ 
 +&& [ "${DEV_ONAME}" != "${DEV_NAME}" ]
 then ip link set "${DEV_ONAME}" name "${DEV_NAME}" then ip link set "${DEV_ONAME}" name "${DEV_NAME}"
 fi fi
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 EOF EOF
  
-uci set network.wana.device="wana" +while read -r DEV_NAME DEV_MAC 
-uci set network.wanb.device="wanb" +do 
-uci set network.wana6.device="wana+uci set network.${DEV_NAME}.device="${DEV_NAME}
-uci set network.wanb6.device="wanb+uci set network.${DEV_NAME}6.device="${DEV_NAME}
-uci -q delete network.wana_dev +uci -q delete network.${DEV_NAME}_dev 
-uci set network.wana_dev="device" +uci set network.${DEV_NAME}_dev="device" 
-uci set network.wana_dev.name="wana+uci set network.${DEV_NAME}_dev.mac="${DEV_MAC}
-uci set network.wana_dev.mac="11:22:33:44:55:66" +uci set network.${DEV_NAME}_dev.name="${DEV_NAME}" 
-uci -q delete network.wanb_dev +done << EOI 
-uci set network.wanb_dev="device" +wana 11:22:33:44:55:66 
-uci set network.wanb_dev.name="wanb+wanb aa:bb:cc:dd:ee:ff 
-uci set network.wanb_dev.mac="aa:bb:cc:dd:ee:ff"+EOI
 uci commit network uci commit network
-/etc/init.d/network restart+service network restart
 </code> </code>
  
 +==== Create deterministic/persistent links to USB-serial devices ====
 +Resulting links will be placed in /dev/serial/by-id and /dev/serial/by-path,
 +with a name structure closely resembling links created by udev, but not fully exact.
 +
 +<code bash>
 +set -o pipefail
 +[ "${ACTION}" = "bind" -o "${ACTION}" = "unbind" ] || exit 0
 +[ "${SUBSYSTEM}" = "usb-serial" ] || exit 0
 +[ -n "${DEVICENAME}" -a -n "${DEVPATH}" ] || exit 1
 +
 +if [ "${ACTION}" = "bind" ]; then
 +        subsystem="$(basename $(readlink /sys${DEVPATH}/../subsystem))"
 +
 +        [ "$subsystem" = "usb" ] || exit 0
 +
 +        replace_whitespace="s/^[ \t]*|[ \t]*$//g; s/[ \t]+/_/g"
 +        manufacturer="$(cat /sys${DEVPATH}/../../manufacturer | sed -E "${replace_whitespace}")" || manufacturer="$(cat /sys${DEVPATH}/../../idVendor)"
 +        product="$(cat /sys${DEVPATH}/../../product | sed -E "${replace_whitespace}")" || product="$(cat /sys${DEVPATH}/../../idProduct)"
 +        serial="$(cat /sys${DEVPATH}/../../serial | sed -E "${replace_whitespace}")"
 +        interface="$(cat /sys${DEVPATH}/../bInterfaceNumber)"
 +        port="$(cat /sys${DEVPATH}/port_number)"
 +
 +        replace_chars="s/[^0-9A-Za-z#+.:=@-]/_/g"
 +        id_link=$(echo "${subsystem}"-"${manufacturer}"_"${product}${serial:+_}${serial}"-if"${interface}${port:+-port}${port}" | sed "${replace_chars}")
 +        path_link=$(echo "${DEVPATH}${port:+-port}${port}" | sed "s%/devices/%%; s%/${DEVICENAME}%%g; ${replace_chars}")
 +
 +        mkdir -p /dev/serial/by-id /dev/serial/by-path
 +        ln -sf "/dev/${DEVICENAME}" "/dev/serial/by-id/${id_link}"
 +        ln -sf "/dev/${DEVICENAME}" "/dev/serial/by-path/${path_link}"
 +elif [ "${ACTION}" = "unbind" ]; then
 +        for link in $(find /dev/serial -type l); do
 +                [ -L ${link} -a "$(readlink ${link})" = "/dev/$DEVICENAME" ] && rm ${link}
 +        done
 +fi
 +</code>
 +[[https://gist.github.com/Leo-PL/b5ee737e49b34c1551dba6c182707c8e|(Source)]]
  • Last modified: 2024/12/19 04:42
  • by pythonic