Pierre-Olivier Mercier
d57c08a6c4
Probe the configured Ethernet interface (default eth0, overridable via -ethernet-interface) at startup. If no DHCP-assigned IPv4 is present, start the wpa_supplicant service so the WiFi backend has something to talk to; otherwise leave it alone and rely on the wired uplink.
108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
package config
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import (
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"flag"
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"log"
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"os"
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"path"
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"strings"
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)
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type Config struct {
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Bind string
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WifiInterface string
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HotspotInterface string
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EthernetInterface string
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WifiBackend string
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StationBackend string // "arp", "dhcp", or "hostapd"
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DHCPLeasesPath string
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ARPTablePath string
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SyslogEnabled bool
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SyslogPath string
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SyslogFilter []string
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SyslogSource string
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}
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// ConsolidateConfig fills an Options struct by reading configuration from
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// config files, environment, then command line.
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//
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// Should be called only one time.
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func ConsolidateConfig() (opts *Config, err error) {
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// Define defaults options
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opts = &Config{
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Bind: "127.0.0.1:8080",
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WifiInterface: "wlan0",
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HotspotInterface: "wlan1",
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EthernetInterface: "eth0",
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DHCPLeasesPath: "/var/lib/dhcp/dhcpd.leases",
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ARPTablePath: "/proc/net/arp",
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SyslogEnabled: false,
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SyslogPath: "/var/log/messages",
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SyslogFilter: []string{"daemon.info wpa_supplicant:", "daemon.info iwd:", "daemon.info hostapd:"},
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SyslogSource: "iwd",
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}
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declareFlags(opts)
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// Establish a list of possible configuration file locations
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configLocations := []string{
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"repeater.conf",
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}
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if home, err := os.UserConfigDir(); err == nil {
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configLocations = append(configLocations, path.Join(home, "repeater", "repeater.conf"))
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}
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configLocations = append(configLocations, path.Join("etc", "repeater.conf"))
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// If config file exists, read configuration from it
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for _, filename := range configLocations {
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if _, e := os.Stat(filename); !os.IsNotExist(e) {
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log.Printf("Loading configuration from %s\n", filename)
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err = parseFile(opts, filename)
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if err != nil {
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return
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}
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break
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}
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}
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// Then, overwrite that by what is present in the environment
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err = parseEnvironmentVariables(opts)
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if err != nil {
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return
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}
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// Finaly, command line takes precedence
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err = parseCLI(opts)
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if err != nil {
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return
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}
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// Validate configuration
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if opts.WifiBackend != "iwd" && opts.WifiBackend != "wpasupplicant" {
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log.Fatalf("wifi-backend must be set to 'iwd' or 'wpasupplicant' (got: '%s')", opts.WifiBackend)
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}
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if opts.StationBackend != "arp" && opts.StationBackend != "dhcp" && opts.StationBackend != "hostapd" {
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log.Fatalf("station-backend must be set to 'arp', 'dhcp', or 'hostapd' (got: '%s')", opts.StationBackend)
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}
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return
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}
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// parseLine treats a config line and place the read value in the variable
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// declared to the corresponding flag.
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func parseLine(o *Config, line string) (err error) {
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fields := strings.SplitN(line, "=", 2)
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orig_key := strings.TrimSpace(fields[0])
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value := strings.TrimSpace(fields[1])
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key := strings.TrimPrefix(orig_key, "REPEATER_")
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key = strings.Replace(key, "_", "-", -1)
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key = strings.ToLower(key)
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err = flag.Set(key, value)
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return
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}
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