Initial port of wifi config utility from python 3
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cmd/wifi/README.md
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cmd/wifi/README.md
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# wifi
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This is the WiFi auto-configuration code for the PiFrame project.
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This utility will look for a USB disk containing a ```wifi.txt``` file contianing the ```essid``` and ```password``` for the WiFi setup. If the file is found on a non-mounted USB disk, it will re-configure wifi according to the contents of the file.
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cmd/wifi/wifi.go
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cmd/wifi/wifi.go
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package main
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import (
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"strings"
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)
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// Various commands that we need for this process
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const (
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CMD_BLKID = "/usr/sbin/blkid"
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CMD_FINDMNT = "/usr/bin/findmnt"
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CMD_MOUNT = "/usr/bin/mount"
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CMD_NMCLI = "/usr/bin/nmcli"
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CMD_UMOUNT = "/usr/bin/umount"
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)
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// Various file paths we need
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const (
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MOUNTPOINT = "/var/wifi"
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CONFIG_FILE = "wifi.txt"
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CONFIG_PATH_FULL = MOUNTPOINT + "/" + CONFIG_FILE
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)
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func main() {
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// Check if mountpoint exists and create if it doesn't
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if _, err := os.Stat(MOUNTPOINT); os.IsNotExist(err) {
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if err := os.Mkdir(MOUNTPOINT, 0755); err != nil {
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log.Fatalf("Could not create mountpoint %s : %s ", MOUNTPOINT, err)
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}
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}
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// Find all blkids that we need to evaluate for wifi config
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blkidOut, err := exec.Command(CMD_BLKID, "-o", "device").Output()
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if err != nil {
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log.Fatalf("Error running %s : %s", CMD_BLKID, err)
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}
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blkids := string(blkidOut)
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// Check blkids to see if they are already mounted
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// skip if mounted, skip zram (never mounted) as well
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for _, blkid := range strings.Split(strings.TrimSuffix(blkids, "\n"), "\n") {
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if blkid == "" || strings.Contains(blkid, "zram") {
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continue
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}
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// SKIP err check here, findmnt will exit w/ status 1 if it's not mounted
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// We obviously don't care if it can't find a mountpoint, that's the intent here
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findmntOut, _ := exec.Command(CMD_FINDMNT, "-n", "-o", "TARGET", blkid).Output()
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mnt := strings.Trim(string(findmntOut), "\n")
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if mnt == "" {
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// Mount the unmounted volume
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err := exec.Command(CMD_MOUNT, blkid, MOUNTPOINT).Run()
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if err != nil {
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log.Fatalf("Could not mount %s : %s", blkid, err)
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}
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// Check if the wifi config exists at the new mountpoint, we don't care if it's not present so just keep going
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if _, err := os.Stat(CONFIG_PATH_FULL); os.IsNotExist(err) {
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if err != nil {
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log.Println("WiFi config not found")
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err := exec.Command(CMD_UMOUNT, MOUNTPOINT).Run()
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if err != nil {
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log.Fatalf("Could not unmount %s : %s ", MOUNTPOINT, err)
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}
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continue
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}
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}
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// Sanity check config file
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stat, err := os.Stat(CONFIG_PATH_FULL)
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if err != nil {
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log.Fatalf("Error getting config file information : %s", err)
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}
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if stat.Size() > 100000 {
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log.Fatal("Config is >100kb, cannot process")
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}
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if !stat.Mode().IsRegular() {
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log.Fatal("Config is NOT a regular (TEXT) file, cannot process")
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}
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// Open and read wifi config file
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configFileContents, err := ioutil.ReadFile(CONFIG_PATH_FULL)
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if err != nil {
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log.Fatalf("Error reading file %s : %s", CONFIG_PATH_FULL, err)
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}
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config := strings.Split(strings.Trim(string(configFileContents), "\n"), "\n")
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// Final sanity checks
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if len(config) != 2 {
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log.Fatal("Config has incorrect number of lines, it should only be 2 lines")
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}
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// Doing stuff with the file contents goes here
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essid := config[0]
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password := config[1]
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log.Printf("Using config: %s / %s for WiFi\n", essid, password)
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// Cleanup existing WiFi connections
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nmcliOut, err := exec.Command(CMD_NMCLI, "-t", "connection", "show").Output()
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if err != nil {
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log.Fatalf("Error running %s : %s", CMD_NMCLI, err)
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}
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connections := strings.Split(strings.Trim(string(nmcliOut), "\n"), "\n")
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for _, connection := range connections {
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details := strings.Split(connection, ":")
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if details[2] != "802-11-wireless" {
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continue
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}
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log.Printf("Cleaning up WiFi connection %s", details[0])
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err := exec.Command(CMD_NMCLI, "connection", "del", details[1]).Run()
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if err != nil {
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log.Fatalf("Error running %s : %s", CMD_NMCLI, err)
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}
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}
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// Create new WiFi connection with network manager
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log.Printf("Connecting to %s with password %s\n", essid, password)
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err = exec.Command(CMD_NMCLI, "d", "wifi", "connect", essid, "password", password).Run()
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if err != nil {
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log.Fatalf("Error running %s : %s", CMD_NMCLI, err)
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}
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// Unmount the filesystem and continue
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err = exec.Command(CMD_UMOUNT, MOUNTPOINT).Run()
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if err != nil {
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log.Fatalf("Could not unmount %s : %s ", MOUNTPOINT, err)
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}
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}
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}
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}
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