lxc.go

// +build !without_lxc

/*
 * This file is part of the libvirt-go project
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * Copyright (c) 2013 Alex Zorin
 * Copyright (C) 2016 Red Hat, Inc.
 *
 */

package libvirt

/*
#cgo pkg-config: libvirt
// Can't rely on pkg-config for libvirt-lxc since it was not
// installed until 2.6.0 onwards
#cgo LDFLAGS: -lvirt-lxc
#include <stdlib.h>
#include <string.h>
#include "lxc_wrapper.h"
*/
import "C"

import (
	"os"
	"unsafe"
)

func (d *Domain) LxcOpenNamespace(flags uint32) ([]os.File, error) {
	var cfdlist *C.int

	var err C.virError
	ret := C.virDomainLxcOpenNamespaceWrapper(d.ptr, &cfdlist, C.uint(flags), &err)
	if ret == -1 {
		return []os.File{}, makeError(&err)
	}
	fdlist := make([]os.File, ret)
	for i := 0; i < int(ret); i++ {
		var cfd C.int
		cfd = *(*C.int)(unsafe.Pointer(uintptr(unsafe.Pointer(cfdlist)) + (unsafe.Sizeof(cfd) * uintptr(i))))
		fdlist[i] = *os.NewFile(uintptr(cfd), "namespace")
	}
	defer C.free(unsafe.Pointer(cfdlist))
	return fdlist, nil
}

func (d *Domain) LxcEnterNamespace(fdlist []os.File, flags uint32) ([]os.File, error) {
	var coldfdlist *C.int
	var ncoldfdlist C.uint
	cfdlist := make([]C.int, len(fdlist))
	for i := 0; i < len(fdlist); i++ {
		cfdlist[i] = C.int(fdlist[i].Fd())
	}

	var err C.virError
	ret := C.virDomainLxcEnterNamespaceWrapper(d.ptr, C.uint(len(fdlist)), &cfdlist[0], &ncoldfdlist, &coldfdlist, C.uint(flags), &err)
	if ret == -1 {
		return []os.File{}, makeError(&err)
	}
	oldfdlist := make([]os.File, ncoldfdlist)
	for i := 0; i < int(ncoldfdlist); i++ {
		var cfd C.int
		cfd = *(*C.int)(unsafe.Pointer(uintptr(unsafe.Pointer(coldfdlist)) + (unsafe.Sizeof(cfd) * uintptr(i))))
		oldfdlist[i] = *os.NewFile(uintptr(cfd), "namespace")
	}
	defer C.free(unsafe.Pointer(coldfdlist))
	return oldfdlist, nil
}

func DomainLxcEnterSecurityLabel(model *NodeSecurityModel, label *SecurityLabel, flags uint32) (*SecurityLabel, error) {
	var cmodel C.virSecurityModel
	var clabel C.virSecurityLabel
	var coldlabel C.virSecurityLabel

	cmodelstrlen := len(model.Model)
	if cmodelstrlen > (C.VIR_SECURITY_MODEL_BUFLEN - 1) {
		cmodelstrlen = C.VIR_SECURITY_MODEL_BUFLEN - 1
	}
	cmodelstr := C.CString(model.Model)
	defer C.free(unsafe.Pointer(cmodelstr))

	cdoistrlen := len(model.Doi)
	if cdoistrlen >= (C.VIR_SECURITY_DOI_BUFLEN - 1) {
		cdoistrlen = C.VIR_SECURITY_DOI_BUFLEN - 1
	}
	cdoistr := C.CString(model.Doi)
	defer C.free(unsafe.Pointer(cdoistr))

	C.memcpy(unsafe.Pointer(&cmodel.model), unsafe.Pointer(cmodelstr), C.size_t(cmodelstrlen))
	C.memcpy(unsafe.Pointer(&cmodel.doi), unsafe.Pointer(cdoistr), C.size_t(cdoistrlen))

	clabelstrlen := len(label.Label)
	if clabelstrlen > (C.VIR_SECURITY_LABEL_BUFLEN - 1) {
		clabelstrlen = C.VIR_SECURITY_LABEL_BUFLEN - 1
	}
	clabelstr := C.CString(label.Label)
	defer C.free(unsafe.Pointer(clabelstr))

	C.memcpy(unsafe.Pointer(&clabel.label), unsafe.Pointer(clabelstr), C.size_t(clabelstrlen))
	if label.Enforcing {
		clabel.enforcing = 1
	} else {
		clabel.enforcing = 0
	}

	var err C.virError
	ret := C.virDomainLxcEnterSecurityLabelWrapper(&cmodel, &clabel, &coldlabel, C.uint(flags), &err)
	if ret == -1 {
		return nil, makeError(&err)
	}

	var oldlabel SecurityLabel

	oldlabel.Label = C.GoString((*C.char)(unsafe.Pointer(&coldlabel.label)))
	if coldlabel.enforcing != 0 {
		oldlabel.Enforcing = true
	} else {
		oldlabel.Enforcing = false
	}

	return &oldlabel, nil
}

func (d *Domain) DomainLxcEnterCGroup(flags uint32) error {
	if C.LIBVIR_VERSION_NUMBER < 2000000 {
		return makeNotImplementedError("virDomainLxcEnterCGroup")
	}

	var err C.virError
	ret := C.virDomainLxcEnterCGroupWrapper(d.ptr, C.uint(flags), &err)

	if ret == -1 {
		return makeError(&err)
	}

	return nil
}