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// Copyright 2024 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build freebsd
// +build freebsd
package collector
import (
"errors"
"fmt"
"log/slog"
"unsafe"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
)
/*
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
*/
import "C"
var (
bsdNetstatTcpSendPacketsTotal = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "netstat", "tcp_transmit_packets_total"),
"TCP packets sent",
nil, nil,
)
bsdNetstatTcpRecvPacketsTotal = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "netstat", "tcp_receive_packets_total"),
"TCP packets received",
nil, nil,
)
)
type netStatCollector struct {
netStatMetric *prometheus.Desc
}
func init() {
registerCollector("netstat", defaultEnabled, NewNetStatCollector)
}
func NewNetStatCollector(logger *slog.Logger) (Collector, error) {
return &netStatCollector{}, nil
}
func (c *netStatCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.netStatMetric
}
func (c *netStatCollector) Collect(ch chan<- prometheus.Metric) {
_ = c.Update(ch)
}
func getData(queryString string) ([]byte, error) {
data, err := unix.SysctlRaw(queryString)
if err != nil {
fmt.Println("Error:", err)
return nil, err
}
if len(data) < int(unsafe.Sizeof(C.struct_tcpstat{})) {
return nil, errors.New("Data Size mismatch")
}
return data, nil
}
func (c *netStatCollector) Update(ch chan<- prometheus.Metric) error {
tcpData, err := getData("net.inet.tcp.stats")
if err != nil {
return err
}
tcpStats := *(*C.struct_tcpstat)(unsafe.Pointer(&tcpData[0]))
ch <- prometheus.MustNewConstMetric(
bsdNetstatTcpSendPacketsTotal,
prometheus.CounterValue,
float64(tcpStats.tcps_sndtotal),
)
ch <- prometheus.MustNewConstMetric(
bsdNetstatTcpRecvPacketsTotal,
prometheus.CounterValue,
float64(tcpStats.tcps_rcvtotal),
)
return nil
}
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