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|
/* $OpenBSD: vmctl.c,v 1.70 2019/08/14 07:34:49 anton Exp $ */
/*
* Copyright (c) 2014 Mike Larkin <mlarkin@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <machine/vmmvar.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <imsg.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <pwd.h>
#include <grp.h>
#include "vmd.h"
#include "virtio.h"
#include "vmctl.h"
#include "atomicio.h"
extern char *__progname;
uint32_t info_id;
char info_name[VMM_MAX_NAME_LEN];
enum actions info_action;
unsigned int info_flags;
/*
* vm_start
*
* Request vmd to start the VM defined by the supplied parameters
*
* Parameters:
* start_id: optional ID of the VM
* name: optional name of the VM
* memsize: memory size (MB) of the VM to create
* nnics: number of vionet network interfaces to create
* nics: switch names of the network interfaces to create
* ndisks: number of disk images
* disks: disk image file names
* kernel: kernel image to load
* iso: iso image file
* instance: create instance from vm
*
* Return:
* 0 if the request to start the VM was sent successfully.
* ENOMEM if a memory allocation failure occurred.
*/
int
vm_start(uint32_t start_id, const char *name, int memsize, int nnics,
char **nics, int ndisks, char **disks, int *disktypes, char *kernel,
char *iso, char *instance, unsigned int bootdevice)
{
struct vmop_create_params *vmc;
struct vm_create_params *vcp;
unsigned int flags = 0;
int i;
const char *s;
if (memsize)
flags |= VMOP_CREATE_MEMORY;
if (nnics)
flags |= VMOP_CREATE_NETWORK;
if (ndisks)
flags |= VMOP_CREATE_DISK;
if (kernel)
flags |= VMOP_CREATE_KERNEL;
if (iso)
flags |= VMOP_CREATE_CDROM;
if (instance)
flags |= VMOP_CREATE_INSTANCE;
else if (flags != 0) {
if (memsize < 1)
memsize = VM_DEFAULT_MEMORY;
if (ndisks > VMM_MAX_DISKS_PER_VM)
errx(1, "too many disks");
else if (ndisks == 0)
warnx("starting without disks");
if (kernel == NULL && ndisks == 0 && !iso)
errx(1, "no kernel or disk/cdrom specified");
if (nnics == -1)
nnics = 0;
if (nnics > VMM_MAX_NICS_PER_VM)
errx(1, "too many network interfaces");
if (nnics == 0)
warnx("starting without network interfaces");
}
if ((vmc = calloc(1, sizeof(struct vmop_create_params))) == NULL)
return (ENOMEM);
vmc->vmc_flags = flags;
/* vcp includes configuration that is shared with the kernel */
vcp = &vmc->vmc_params;
/*
* XXX: vmd(8) fills in the actual memory ranges. vmctl(8)
* just passes in the actual memory size in MB here.
*/
vcp->vcp_nmemranges = 1;
vcp->vcp_memranges[0].vmr_size = memsize;
vcp->vcp_ncpus = 1;
vcp->vcp_ndisks = ndisks;
vcp->vcp_nnics = nnics;
vcp->vcp_id = start_id;
for (i = 0 ; i < ndisks; i++) {
if (strlcpy(vcp->vcp_disks[i], disks[i],
sizeof(vcp->vcp_disks[i])) >=
sizeof(vcp->vcp_disks[i]))
errx(1, "disk path too long");
vmc->vmc_disktypes[i] = disktypes[i];
}
for (i = 0 ; i < nnics; i++) {
vmc->vmc_ifflags[i] = VMIFF_UP;
if (strcmp(".", nics[i]) == 0) {
/* Add a "local" interface */
(void)strlcpy(vmc->vmc_ifswitch[i], "",
sizeof(vmc->vmc_ifswitch[i]));
vmc->vmc_ifflags[i] |= VMIFF_LOCAL;
} else {
/* Add an interface to a switch */
if (strlcpy(vmc->vmc_ifswitch[i], nics[i],
sizeof(vmc->vmc_ifswitch[i])) >=
sizeof(vmc->vmc_ifswitch[i]))
errx(1, "interface name too long");
}
}
if (name != NULL) {
/*
* Allow VMs names with alphanumeric characters, dot, hyphen
* and underscore. But disallow dot, hyphen and underscore at
* the start.
*/
if (*name == '-' || *name == '.' || *name == '_')
errx(1, "invalid VM name");
for (s = name; *s != '\0'; ++s) {
if (!(isalnum(*s) || *s == '.' || *s == '-' ||
*s == '_'))
errx(1, "invalid VM name");
}
if (strlcpy(vcp->vcp_name, name,
sizeof(vcp->vcp_name)) >= sizeof(vcp->vcp_name))
errx(1, "vm name too long");
}
if (kernel != NULL)
if (strlcpy(vcp->vcp_kernel, kernel,
sizeof(vcp->vcp_kernel)) >= sizeof(vcp->vcp_kernel))
errx(1, "kernel name too long");
if (iso != NULL)
if (strlcpy(vcp->vcp_cdrom, iso,
sizeof(vcp->vcp_cdrom)) >= sizeof(vcp->vcp_cdrom))
errx(1, "cdrom name too long");
if (instance != NULL)
if (strlcpy(vmc->vmc_instance, instance,
sizeof(vmc->vmc_instance)) >= sizeof(vmc->vmc_instance))
errx(1, "instance vm name too long");
vmc->vmc_bootdevice = bootdevice;
imsg_compose(ibuf, IMSG_VMDOP_START_VM_REQUEST, 0, 0, -1,
vmc, sizeof(struct vmop_create_params));
free(vcp);
return (0);
}
/*
* vm_start_complete
*
* Callback function invoked when we are expecting an
* IMSG_VMDOP_START_VMM_RESPONSE message indicating the completion of
* a start vm operation.
*
* Parameters:
* imsg : response imsg received from vmd
* ret : return value
* autoconnect : open the console after startup
*
* Return:
* Always 1 to indicate we have processed the return message (even if it
* was an incorrect/failure message)
*
* The function also sets 'ret' to the error code as follows:
* 0 : Message successfully processed
* EINVAL: Invalid or unexpected response from vmd
* EIO : vm_start command failed
* ENOENT: a specified component of the VM could not be found (disk image,
* BIOS firmware image, etc)
*/
int
vm_start_complete(struct imsg *imsg, int *ret, int autoconnect)
{
struct vmop_result *vmr;
int res;
if (imsg->hdr.type == IMSG_VMDOP_START_VM_RESPONSE) {
vmr = (struct vmop_result *)imsg->data;
res = vmr->vmr_result;
if (res) {
switch (res) {
case VMD_BIOS_MISSING:
warnx("vmm bios firmware file not found.");
*ret = ENOENT;
break;
case VMD_DISK_MISSING:
warnx("could not open disk image(s)");
*ret = ENOENT;
break;
case VMD_DISK_INVALID:
warnx("specified disk image(s) are "
"not regular files");
*ret = ENOENT;
break;
case VMD_CDROM_MISSING:
warnx("could not find specified iso image");
*ret = ENOENT;
break;
case VMD_CDROM_INVALID:
warnx("specified iso image is not a regular "
"file");
*ret = ENOENT;
break;
case VMD_PARENT_INVALID:
warnx("invalid template");
*ret = EINVAL;
break;
default:
errno = res;
warn("start vm command failed");
*ret = EIO;
}
} else if (autoconnect) {
/* does not return */
ctl_openconsole(vmr->vmr_ttyname);
} else {
warnx("started vm %d successfully, tty %s",
vmr->vmr_id, vmr->vmr_ttyname);
*ret = 0;
}
} else {
warnx("unexpected response received from vmd");
*ret = EINVAL;
}
return (1);
}
void
send_vm(uint32_t id, const char *name)
{
struct vmop_id vid;
int fds[2], readn, writen;
long pagesz;
char *buf;
pagesz = getpagesize();
buf = malloc(pagesz);
if (buf == NULL)
errx(1, "%s: memory allocation failure", __func__);
memset(&vid, 0, sizeof(vid));
vid.vid_id = id;
if (name != NULL)
strlcpy(vid.vid_name, name, sizeof(vid.vid_name));
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, fds) == -1) {
warnx("%s: socketpair creation failed", __func__);
} else {
imsg_compose(ibuf, IMSG_VMDOP_SEND_VM_REQUEST, 0, 0, fds[0],
&vid, sizeof(vid));
imsg_flush(ibuf);
while (1) {
readn = atomicio(read, fds[1], buf, pagesz);
if (!readn)
break;
writen = atomicio(vwrite, STDOUT_FILENO, buf,
readn);
if (writen != readn)
break;
}
if (vid.vid_id)
warnx("sent vm %d successfully", vid.vid_id);
else
warnx("sent vm %s successfully", vid.vid_name);
}
free(buf);
}
void
vm_receive(uint32_t id, const char *name)
{
struct vmop_id vid;
int fds[2], readn, writen;
long pagesz;
char *buf;
pagesz = getpagesize();
buf = malloc(pagesz);
if (buf == NULL)
errx(1, "%s: memory allocation failure", __func__);
memset(&vid, 0, sizeof(vid));
if (name != NULL)
strlcpy(vid.vid_name, name, sizeof(vid.vid_name));
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, fds) == -1) {
warnx("%s: socketpair creation failed", __func__);
} else {
imsg_compose(ibuf, IMSG_VMDOP_RECEIVE_VM_REQUEST, 0, 0, fds[0],
&vid, sizeof(vid));
imsg_flush(ibuf);
while (1) {
readn = atomicio(read, STDIN_FILENO, buf, pagesz);
if (!readn) {
close(fds[1]);
break;
}
writen = atomicio(vwrite, fds[1], buf, readn);
if (writen != readn)
break;
}
}
free(buf);
}
void
pause_vm(uint32_t pause_id, const char *name)
{
struct vmop_id vid;
memset(&vid, 0, sizeof(vid));
vid.vid_id = pause_id;
if (name != NULL)
(void)strlcpy(vid.vid_name, name, sizeof(vid.vid_name));
imsg_compose(ibuf, IMSG_VMDOP_PAUSE_VM, 0, 0, -1,
&vid, sizeof(vid));
}
int
pause_vm_complete(struct imsg *imsg, int *ret)
{
struct vmop_result *vmr;
int res;
if (imsg->hdr.type == IMSG_VMDOP_PAUSE_VM_RESPONSE) {
vmr = (struct vmop_result *)imsg->data;
res = vmr->vmr_result;
if (res) {
errno = res;
warn("pause vm command failed");
*ret = EIO;
} else {
warnx("paused vm %d successfully", vmr->vmr_id);
*ret = 0;
}
} else {
warnx("unexpected response received from vmd");
*ret = EINVAL;
}
return (1);
}
void
unpause_vm(uint32_t pause_id, const char *name)
{
struct vmop_id vid;
memset(&vid, 0, sizeof(vid));
vid.vid_id = pause_id;
if (name != NULL)
(void)strlcpy(vid.vid_name, name, sizeof(vid.vid_name));
imsg_compose(ibuf, IMSG_VMDOP_UNPAUSE_VM, 0, 0, -1,
&vid, sizeof(vid));
}
int
unpause_vm_complete(struct imsg *imsg, int *ret)
{
struct vmop_result *vmr;
int res;
if (imsg->hdr.type == IMSG_VMDOP_UNPAUSE_VM_RESPONSE) {
vmr = (struct vmop_result *)imsg->data;
res = vmr->vmr_result;
if (res) {
errno = res;
warn("unpause vm command failed");
*ret = EIO;
} else {
warnx("unpaused vm %d successfully", vmr->vmr_id);
*ret = 0;
}
} else {
warnx("unexpected response received from vmd");
*ret = EINVAL;
}
return (1);
}
/*
* terminate_vm
*
* Request vmd to stop the VM indicated
*
* Parameters:
* terminate_id: ID of the vm to be terminated
* name: optional name of the VM to be terminated
* flags: VMOP_FORCE or VMOP_WAIT flags
*/
void
terminate_vm(uint32_t terminate_id, const char *name, unsigned int flags)
{
struct vmop_id vid;
memset(&vid, 0, sizeof(vid));
vid.vid_id = terminate_id;
if (name != NULL) {
(void)strlcpy(vid.vid_name, name, sizeof(vid.vid_name));
fprintf(stderr, "stopping vm %s: ", name);
} else {
fprintf(stderr, "stopping vm: ");
}
vid.vid_flags = flags & (VMOP_FORCE|VMOP_WAIT);
imsg_compose(ibuf, IMSG_VMDOP_TERMINATE_VM_REQUEST,
0, 0, -1, &vid, sizeof(vid));
}
/*
* terminate_vm_complete
*
* Callback function invoked when we are expecting an
* IMSG_VMDOP_TERMINATE_VMM_RESPONSE message indicating the completion of
* a terminate vm operation.
*
* Parameters:
* imsg : response imsg received from vmd
* ret : return value
* flags: VMOP_FORCE or VMOP_WAIT flags
*
* Return:
* Always 1 to indicate we have processed the return message (even if it
* was an incorrect/failure message)
*
* The function also sets 'ret' to the error code as follows:
* 0 : Message successfully processed
* EINVAL: Invalid or unexpected response from vmd
* EIO : terminate_vm command failed
*/
int
terminate_vm_complete(struct imsg *imsg, int *ret, unsigned int flags)
{
struct vmop_result *vmr;
int res;
if (imsg->hdr.type == IMSG_VMDOP_TERMINATE_VM_RESPONSE) {
vmr = (struct vmop_result *)imsg->data;
res = vmr->vmr_result;
if (res) {
switch (res) {
case VMD_VM_STOP_INVALID:
fprintf(stderr,
"cannot stop vm that is not running\n");
*ret = EINVAL;
break;
case ENOENT:
fprintf(stderr, "vm not found\n");
*ret = EIO;
break;
case EINTR:
fprintf(stderr, "interrupted call\n");
*ret = EIO;
break;
default:
errno = res;
fprintf(stderr, "failed: %s\n",
strerror(res));
*ret = EIO;
}
} else if (flags & VMOP_WAIT) {
fprintf(stderr, "terminated vm %d\n", vmr->vmr_id);
} else if (flags & VMOP_FORCE) {
fprintf(stderr, "forced to terminate vm %d\n",
vmr->vmr_id);
} else {
fprintf(stderr, "requested to shutdown vm %d\n",
vmr->vmr_id);
*ret = 0;
}
} else {
fprintf(stderr, "unexpected response received from vmd\n");
*ret = EINVAL;
}
errno = *ret;
return (1);
}
/*
* terminate_all
*
* Request to stop all VMs gracefully
*
* Parameters
* list: the vm information (consolidated) returned from vmd via imsg
* ct : the size (number of elements in 'list') of the result
* flags: VMOP_FORCE or VMOP_WAIT flags
*/
void
terminate_all(struct vmop_info_result *list, size_t ct, unsigned int flags)
{
struct vm_info_result *vir;
struct vmop_info_result *vmi;
struct parse_result res;
size_t i;
for (i = 0; i < ct; i++) {
vmi = &list[i];
vir = &vmi->vir_info;
/* The VM is already stopped */
if (vir->vir_creator_pid == 0 || vir->vir_id == 0)
continue;
memset(&res, 0, sizeof(res));
res.action = CMD_STOP;
res.id = 0;
res.flags = info_flags;
if ((res.name = strdup(vir->vir_name)) == NULL)
errx(1, "strdup");
vmmaction(&res);
}
}
/*
* waitfor_vm
*
* Wait until vmd stopped the indicated VM
*
* Parameters:
* terminate_id: ID of the vm to be terminated
* name: optional name of the VM to be terminated
*/
void
waitfor_vm(uint32_t terminate_id, const char *name)
{
struct vmop_id vid;
memset(&vid, 0, sizeof(vid));
vid.vid_id = terminate_id;
if (name != NULL) {
(void)strlcpy(vid.vid_name, name, sizeof(vid.vid_name));
fprintf(stderr, "waiting for vm %s: ", name);
} else {
fprintf(stderr, "waiting for vm: ");
}
imsg_compose(ibuf, IMSG_VMDOP_WAIT_VM_REQUEST,
0, 0, -1, &vid, sizeof(vid));
}
/*
* get_info_vm
*
* Return the list of all running VMs or find a specific VM by ID or name.
*
* Parameters:
* id: optional ID of a VM to list
* name: optional name of a VM to list
* action: if CMD_CONSOLE or CMD_STOP open a console or terminate the VM.
* flags: optional flags used by the CMD_STOP action.
*
* Request a list of running VMs from vmd
*/
void
get_info_vm(uint32_t id, const char *name, enum actions action,
unsigned int flags)
{
info_id = id;
if (name != NULL)
(void)strlcpy(info_name, name, sizeof(info_name));
info_action = action;
info_flags = flags;
imsg_compose(ibuf, IMSG_VMDOP_GET_INFO_VM_REQUEST, 0, 0, -1, NULL, 0);
}
/*
* check_info_id
*
* Check if requested name or ID of a VM matches specified arguments
*
* Parameters:
* name: name of the VM
* id: ID of the VM
*/
int
check_info_id(const char *name, uint32_t id)
{
if (info_id == 0 && *info_name == '\0')
return (-1);
if (info_id != 0 && info_id == id)
return (1);
if (*info_name != '\0' && name && strcmp(info_name, name) == 0)
return (1);
return (0);
}
/*
* add_info
*
* Callback function invoked when we are expecting an
* IMSG_VMDOP_GET_INFO_VM_DATA message indicating the receipt of additional
* "list vm" data, or an IMSG_VMDOP_GET_INFO_VM_END_DATA message indicating
* that no additional "list vm" data will be forthcoming.
*
* Parameters:
* imsg : response imsg received from vmd
* ret : return value
*
* Return:
* 0 : the returned data was successfully added to the "list vm" data.
* The caller can expect more data.
* 1 : IMSG_VMDOP_GET_INFO_VM_END_DATA received (caller should not call
* add_info again), or an error occurred adding the returned data
* to the "list vm" data. The caller should check the value of
* 'ret' to determine which case occurred.
*
* This function does not return if a VM is found and info_action is CMD_CONSOLE
*
* The function also sets 'ret' to the error code as follows:
* 0 : Message successfully processed
* EINVAL: Invalid or unexpected response from vmd
* ENOMEM: memory allocation failure
*/
int
add_info(struct imsg *imsg, int *ret)
{
static size_t ct = 0;
static struct vmop_info_result *vir = NULL;
if (imsg->hdr.type == IMSG_VMDOP_GET_INFO_VM_DATA) {
vir = reallocarray(vir, ct + 1,
sizeof(struct vmop_info_result));
if (vir == NULL) {
*ret = ENOMEM;
return (1);
}
memcpy(&vir[ct], imsg->data, sizeof(struct vmop_info_result));
ct++;
*ret = 0;
return (0);
} else if (imsg->hdr.type == IMSG_VMDOP_GET_INFO_VM_END_DATA) {
switch (info_action) {
case CMD_CONSOLE:
vm_console(vir, ct);
break;
case CMD_STOPALL:
terminate_all(vir, ct, info_flags);
break;
default:
print_vm_info(vir, ct);
break;
}
free(vir);
*ret = 0;
return (1);
} else {
*ret = EINVAL;
return (1);
}
}
/*
* vm_state
*
* Returns a string representing the current VM state, note that the order
* matters. A paused VM does have the VM_STATE_RUNNING bit set, but
* VM_STATE_PAUSED is more significant to report.
*
* Parameters
* vm_state: mask indicating the vm state
*/
const char *
vm_state(unsigned int mask)
{
if (mask & VM_STATE_PAUSED)
return "paused";
else if (mask & VM_STATE_RUNNING)
return "running";
else if (mask & VM_STATE_SHUTDOWN)
return "stopping";
/* Presence of absence of other flags */
else if (!mask || (mask & VM_STATE_DISABLED))
return "stopped";
return "unknown";
}
/*
* print_vm_info
*
* Prints the vm information returned from vmd in 'list' to stdout.
*
* Parameters
* list: the vm information (consolidated) returned from vmd via imsg
* ct : the size (number of elements in 'list') of the result
*/
void
print_vm_info(struct vmop_info_result *list, size_t ct)
{
struct vm_info_result *vir;
struct vmop_info_result *vmi;
size_t i;
char *tty;
char curmem[FMT_SCALED_STRSIZE];
char maxmem[FMT_SCALED_STRSIZE];
char user[16], group[16];
const char *name;
int running;
printf("%5s %5s %5s %7s %7s %7s %12s %8s %s\n", "ID", "PID", "VCPUS",
"MAXMEM", "CURMEM", "TTY", "OWNER", "STATE", "NAME");
for (i = 0; i < ct; i++) {
vmi = &list[i];
vir = &vmi->vir_info;
running = (vir->vir_creator_pid != 0 && vir->vir_id != 0);
if (check_info_id(vir->vir_name, vir->vir_id)) {
/* get user name */
name = user_from_uid(vmi->vir_uid, 1);
if (name == NULL)
(void)snprintf(user, sizeof(user),
"%d", vmi->vir_uid);
else
(void)strlcpy(user, name, sizeof(user));
/* get group name */
if (vmi->vir_gid != -1) {
if (vmi->vir_uid == 0)
*user = '\0';
name = group_from_gid(vmi->vir_gid, 1);
if (name == NULL)
(void)snprintf(group, sizeof(group),
":%lld", vmi->vir_gid);
else
(void)snprintf(group, sizeof(group),
":%s", name);
(void)strlcat(user, group, sizeof(user));
}
(void)strlcpy(curmem, "-", sizeof(curmem));
(void)strlcpy(maxmem, "-", sizeof(maxmem));
(void)fmt_scaled(vir->vir_memory_size * 1024 * 1024,
maxmem);
if (running) {
if (*vmi->vir_ttyname == '\0')
tty = "-";
/* get tty - skip /dev/ path */
else if ((tty = strrchr(vmi->vir_ttyname,
'/')) == NULL || ++tty == '\0')
tty = list[i].vir_ttyname;
(void)fmt_scaled(vir->vir_used_size, curmem);
/* running vm */
printf("%5u %5u %5zd %7s %7s %7s %12s %8s %s\n",
vir->vir_id, vir->vir_creator_pid,
vir->vir_ncpus, maxmem, curmem,
tty, user, vm_state(vmi->vir_state),
vir->vir_name);
} else {
/* disabled vm */
printf("%5u %5s %5zd %7s %7s %7s %12s %8s %s\n",
vir->vir_id, "-",
vir->vir_ncpus, maxmem, curmem,
"-", user, vm_state(vmi->vir_state),
vir->vir_name);
}
}
}
}
/*
* vm_console
*
* Connects to the vm console returned from vmd in 'list'.
*
* Parameters
* list: the vm information (consolidated) returned from vmd via imsg
* ct : the size (number of elements in 'list') of the result
*/
__dead void
vm_console(struct vmop_info_result *list, size_t ct)
{
struct vmop_info_result *vir;
size_t i;
for (i = 0; i < ct; i++) {
vir = &list[i];
if ((check_info_id(vir->vir_info.vir_name,
vir->vir_info.vir_id) > 0) &&
(vir->vir_ttyname[0] != '\0')) {
/* does not return */
ctl_openconsole(vir->vir_ttyname);
}
}
errx(1, "console not found");
}
/*
* open_imagefile
*
* Open an imagefile with the specified type, path and size.
*
* Parameters:
* type : format of the image file
* imgfile_path: path to the image file to create
* flags : flags for open(2), e.g. O_RDONLY
* file : file structure
* sz : size of the image file
*
* Return:
* fd : Returns file descriptor of the new image file
* -1 : Operation failed. errno is set.
*/
int
open_imagefile(int type, const char *imgfile_path, int flags,
struct virtio_backing *file, off_t *sz)
{
int fd, ret, basefd[VM_MAX_BASE_PER_DISK], nfd, i;
char path[PATH_MAX];
*sz = 0;
if ((fd = open(imgfile_path, flags)) == -1)
return (-1);
basefd[0] = fd;
nfd = 1;
errno = 0;
switch (type) {
case VMDF_QCOW2:
if (strlcpy(path, imgfile_path, sizeof(path)) >= sizeof(path))
return (-1);
for (i = 0; i < VM_MAX_BASE_PER_DISK - 1; i++, nfd++) {
if ((ret = virtio_qcow2_get_base(basefd[i],
path, sizeof(path), imgfile_path)) == -1) {
log_debug("%s: failed to get base %d", __func__, i);
return -1;
} else if (ret == 0)
break;
/*
* This might be called after unveil is already
* locked but it is save to ignore the EPERM error
* here as the subsequent open would fail as well.
*/
if ((ret = unveil(path, "r")) != 0 &&
(ret != EPERM))
err(1, "unveil");
if ((basefd[i + 1] = open(path, O_RDONLY)) == -1) {
log_warn("%s: failed to open base %s",
__func__, path);
return (-1);
}
}
ret = virtio_qcow2_init(file, sz, basefd, nfd);
break;
default:
ret = virtio_raw_init(file, sz, &fd, 1);
break;
}
if (ret == -1) {
for (i = 0; i < nfd; i++)
close(basefd[i]);
return (-1);
}
return (fd);
}
/*
* create_imagefile
*
* Create an empty imagefile with the specified type, path and size.
*
* Parameters:
* type : format of the image file
* imgfile_path: path to the image file to create
* base_path : path to the qcow2 base image
* imgsize : size of the image file to create (in MB)
* format : string identifying the format
*
* Return:
* EEXIST: The requested image file already exists
* 0 : Image file successfully created
* Exxxx : Various other Exxxx errno codes due to other I/O errors
*/
int
create_imagefile(int type, const char *imgfile_path, const char *base_path,
long imgsize, const char **format)
{
int ret;
switch (type) {
case VMDF_QCOW2:
*format = "qcow2";
ret = virtio_qcow2_create(imgfile_path, base_path, imgsize);
break;
default:
*format = "raw";
ret = virtio_raw_create(imgfile_path, imgsize);
break;
}
return (ret);
}
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