FreeBSD support (#1)

* Add HostInfo support for FreeBSD

Initial implementation of HostInfo for FreeBSD platforms.

* Use os.SameFile to compare cwds

On some platforms (e.g. FreeBSD) user home directories are symlinks
and os.Getcwd will return the symlink path.

On FreeBSD CWD for processes that's not the running process will not
give the symlink but the resolved path causing the test to fail at this
point.

Fix is to use the os.SameFile call to resolve both Os.Getcwd and CWD.

* Add basic support for ProcessInfo on FreeBSD.

Implement Process(), Self() and Processes() to the bare minimum.
That is passing all basic tests.

* Add support for OpenHandleEnumerator and OpenHandleCounter.

* Add support for Environment

* Review fixes.

- Fix issue on FreeBSD 12.
- Minor cosmetic issues.

* Clean up build process.

- Remove cgo build directives from things not needing it.
- Add linker flags into .go files.

providers/freebsd/arch.go

@@ -0,0 +1,35 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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.
+
+package freebsd
+
+import (
+	"syscall"
+
+	"github.com/pkg/errors"
+)
+
+const hardwareMIB = "hw.machine"
+
+func Architecture() (string, error) {
+	arch, err := syscall.Sysctl(hardwareMIB)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to get architecture")
+	}
+
+	return arch, nil
+}

providers/freebsd/boottime_freebsd.go

@@ -0,0 +1,37 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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.
+
+package freebsd
+
+import (
+	"syscall"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+const kernBoottimeMIB = "kern.boottime"
+
+func BootTime() (time.Time, error) {
+	var tv syscall.Timeval
+	if err := sysctlByName(kernBoottimeMIB, &tv); err != nil {
+		return time.Time{}, errors.Wrap(err, "failed to get host uptime")
+	}
+
+	bootTime := time.Unix(int64(tv.Sec), int64(tv.Usec)*int64(time.Microsecond))
+	return bootTime, nil
+}

providers/freebsd/defs_freebsd.go

@@ -0,0 +1,34 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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.
+
+// +build ignore
+
+package freebsd
+
+/*
+#include <sys/types.h>
+#include <sys/vmmeter.h>
+#include <sys/time.h>
+#include <kvm.h>
+*/
+import "C"
+
+type vmTotal C.struct_vmtotal
+
+type kvmSwap C.struct_kvm_swap
+
+type clockInfo C.struct_clockinfo

providers/freebsd/doc.go

@@ -0,0 +1,20 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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.
+
+// Package freebsd implements the HostProvider and ProcessProvider interfaces
+// for providing information about FreeBSD
+package freebsd

providers/freebsd/host_freebsd.go

@@ -0,0 +1,229 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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.
+
+// +build,freebsd,cgo
+
+package freebsd
+
+// #cgo LDFLAGS: -lkvm
+//#include <kvm.h>
+//#include <sys/vmmeter.h>
+import "C"
+
+import (
+	"os"
+	"time"
+
+	"github.com/joeshaw/multierror"
+	"github.com/pkg/errors"
+
+	"github.com/dbolcsfoldi/go-sysinfo/internal/registry"
+	"github.com/elastic/go-sysinfo/providers/shared"
+	"github.com/elastic/go-sysinfo/types"
+)
+
+func init() {
+	registry.Register(freebsdSystem{})
+}
+
+type freebsdSystem struct{}
+
+func (s freebsdSystem) Host() (types.Host, error) {
+	return newHost()
+}
+
+type host struct {
+	info types.HostInfo
+}
+
+func (h *host) Info() types.HostInfo {
+	return h.info
+}
+
+func (h *host) CPUTime() (types.CPUTimes, error) {
+	cpu := types.CPUTimes{}
+	r := &reader{}
+	r.cpuTime(&cpu)
+
+	return cpu, nil
+}
+
+func (h *host) Memory() (*types.HostMemoryInfo, error) {
+	m := &types.HostMemoryInfo{}
+	r := &reader{}
+	r.memInfo(m)
+	return m, r.Err()
+}
+
+func newHost() (*host, error) {
+	h := &host{}
+	r := &reader{}
+	r.architecture(h)
+	r.bootTime(h)
+	r.hostname(h)
+	r.network(h)
+	r.kernelVersion(h)
+	r.os(h)
+	r.time(h)
+	r.uniqueID(h)
+	return h, r.Err()
+}
+
+type reader struct {
+	errs []error
+}
+
+func (r *reader) addErr(err error) bool {
+	if err != nil {
+		if errors.Cause(err) != types.ErrNotImplemented {
+			r.errs = append(r.errs, err)
+		}
+		return true
+	}
+	return false
+}
+
+func (r *reader) Err() error {
+	if len(r.errs) > 0 {
+		return &multierror.MultiError{Errors: r.errs}
+	}
+	return nil
+}
+
+func (r *reader) cpuTime(cpu *types.CPUTimes) {
+	cptime, err := Cptime()
+
+	if r.addErr(err) {
+		return
+	}
+
+	cpu.User = time.Duration(cptime["User"])
+	cpu.System = time.Duration(cptime["System"])
+	cpu.Idle = time.Duration(cptime["Idle"])
+	cpu.Nice = time.Duration(cptime["Nice"])
+	cpu.IRQ = time.Duration(cptime["IRQ"])
+}
+
+func (r *reader) memInfo(m *types.HostMemoryInfo) {
+	pageSize, err := PageSize()
+
+	if r.addErr(err) {
+		return
+	}
+
+	totalMemory, err := TotalMemory()
+	if r.addErr(err) {
+		return
+	}
+
+	m.Total = totalMemory
+
+	vm, err := VmTotal()
+	if r.addErr(err) {
+		return
+	}
+
+	m.Free = uint64(vm.Free) * uint64(pageSize)
+	m.Used = m.Total - m.Free
+
+	numFreeBuffers, err := NumFreeBuffers()
+	if r.addErr(err) {
+		return
+	}
+
+	m.Available = m.Free + (uint64(numFreeBuffers) * uint64(pageSize))
+
+	swap, err := KvmGetSwapInfo()
+	if r.addErr(err) {
+		return
+	}
+
+	swapMaxPages, err := SwapMaxPages()
+	if r.addErr(err) {
+		return
+	}
+
+	if swap.Total > swapMaxPages {
+		swap.Total = swapMaxPages
+	}
+
+	m.VirtualTotal = uint64(swap.Total) * uint64(pageSize)
+	m.VirtualUsed = uint64(swap.Used) * uint64(pageSize)
+	m.VirtualFree = m.VirtualTotal - m.VirtualUsed
+}
+
+func (r *reader) architecture(h *host) {
+	v, err := Architecture()
+	if r.addErr(err) {
+		return
+	}
+	h.info.Architecture = v
+}
+
+func (r *reader) bootTime(h *host) {
+	v, err := BootTime()
+	if r.addErr(err) {
+		return
+	}
+
+	h.info.BootTime = v
+}
+
+func (r *reader) hostname(h *host) {
+	v, err := os.Hostname()
+	if r.addErr(err) {
+		return
+	}
+	h.info.Hostname = v
+}
+
+func (r *reader) network(h *host) {
+	ips, macs, err := shared.Network()
+	if r.addErr(err) {
+		return
+	}
+	h.info.IPs = ips
+	h.info.MACs = macs
+}
+
+func (r *reader) kernelVersion(h *host) {
+	v, err := KernelVersion()
+	if r.addErr(err) {
+		return
+	}
+	h.info.KernelVersion = v
+}
+
+func (r *reader) os(h *host) {
+	v, err := OperatingSystem()
+	if r.addErr(err) {
+		return
+	}
+	h.info.OS = v
+}
+
+func (r *reader) time(h *host) {
+	h.info.Timezone, h.info.TimezoneOffsetSec = time.Now().Zone()
+}
+
+func (r *reader) uniqueID(h *host) {
+	v, err := MachineID()
+	if r.addErr(err) {
+		return
+	}
+	h.info.UniqueID = v
+}

providers/freebsd/kernel.go

@@ -0,0 +1,35 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you 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.
+
+package freebsd
+
+import (
+	"syscall"
+
+	"github.com/pkg/errors"
+)
+
+const kernelReleaseMIB = "kern.osrelease"
+
+func KernelVersion() (string, error) {
+	version, err := syscall.Sysctl(kernelReleaseMIB)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to get kernel version")
+	}
+
+	return version, nil
+}