// Receives syslog from routers, switches, and Yealink phones on this host's
// LAN interface, tags each message with useful labels, and ships it to the
// local Loki instance.
//
// Point network devices at this host's IP, port 514/udp (or 1514/tcp for
// devices that only speak TCP framing).

loki.relabel "syslog" {
  forward_to = []

  rule {
    source_labels = ["__syslog_message_hostname"]
    target_label  = "hostname"
  }

  rule {
    source_labels = ["__syslog_message_severity"]
    target_label  = "severity"
  }

  rule {
    source_labels = ["__syslog_message_facility"]
    target_label  = "facility"
  }

  rule {
    source_labels = ["__syslog_connection_ip_address"]
    target_label  = "source_ip"
  }
}

// syslog_format is "rfc3164" (legacy BSD syslog, no version field) rather
// than the component's rfc5424 default — confirmed by packet capture that
// both the Yealink phones and RouterOS routers send rfc3164 in practice.
// A listener can only parse one format; if a device ever sends genuine
// rfc5424, it needs its own listener on a different port.

loki.source.syslog "network_devices_udp" {
  listener {
    address       = "0.0.0.0:514"
    protocol      = "udp"
    syslog_format = "rfc3164"
    labels = {
      job       = "syslog",
      transport = "udp",
    }
  }

  relabel_rules = loki.relabel.syslog.rules
  forward_to    = [loki.write.default.receiver]
}

loki.source.syslog "network_devices_tcp" {
  listener {
    address       = "0.0.0.0:1514"
    protocol      = "tcp"
    syslog_format = "rfc3164"
    labels = {
      job       = "syslog",
      transport = "tcp",
    }
  }

  relabel_rules = loki.relabel.syslog.rules
  forward_to    = [loki.write.default.receiver]
}

loki.write "default" {
  endpoint {
    url = "http://loki:3100/loki/api/v1/push"
  }
}