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qemu / qemu / 8ce26fcd2961a482d193ee47e12e9971397e38f3 / . / qga / commands-posix.c
blob: eaef7be42eaf1256d6246642985d11609d4efbea [file] [log] [blame]
/*
* QEMU Guest Agent POSIX-specific command implementations
*
* Copyright IBM Corp. 2011
*
* Authors:
* Michael Roth <mdroth@linux.vnet.ibm.com>
* Michal Privoznik <mprivozn@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <dirent.h>
#include "qga/guest-agent-core.h"
#include "qga-qmp-commands.h"
#include "qapi/qmp/qerror.h"
#include "qemu/queue.h"
#include "qemu/host-utils.h"
#include "qemu/sockets.h"
#include "qemu/base64.h"
#include "qemu/cutils.h"
#ifndef CONFIG_HAS_ENVIRON
#ifdef __APPLE__
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
#else
extern char **environ;
#endif
#endif
#if defined(__linux__)
#include <mntent.h>
#include <linux/fs.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>
#ifdef FIFREEZE
#define CONFIG_FSFREEZE
#endif
#ifdef FITRIM
#define CONFIG_FSTRIM
#endif
#endif
static void ga_wait_child(pid_t pid, int *status, Error **errp)
{
pid_t rpid;
*status = 0;
do {
rpid = waitpid(pid, status, 0);
} while (rpid == -1 && errno == EINTR);
if (rpid == -1) {
error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
pid);
return;
}
g_assert(rpid == pid);
}
void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
{
const char *shutdown_flag;
Error *local_err = NULL;
pid_t pid;
int status;
slog("guest-shutdown called, mode: %s", mode);
if (!has_mode || strcmp(mode, "powerdown") == 0) {
shutdown_flag = "-P";
} else if (strcmp(mode, "halt") == 0) {
shutdown_flag = "-H";
} else if (strcmp(mode, "reboot") == 0) {
shutdown_flag = "-r";
} else {
error_setg(errp,
"mode is invalid (valid values are: halt|powerdown|reboot");
return;
}
pid = fork();
if (pid == 0) {
/* child, start the shutdown */
setsid();
reopen_fd_to_null(0);
reopen_fd_to_null(1);
reopen_fd_to_null(2);
execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
"hypervisor initiated shutdown", (char*)NULL, environ);
_exit(EXIT_FAILURE);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
return;
}
ga_wait_child(pid, &status, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!WIFEXITED(status)) {
error_setg(errp, "child process has terminated abnormally");
return;
}
if (WEXITSTATUS(status)) {
error_setg(errp, "child process has failed to shutdown");
return;
}
/* succeeded */
}
int64_t qmp_guest_get_time(Error **errp)
{
int ret;
qemu_timeval tq;
int64_t time_ns;
ret = qemu_gettimeofday(&tq);
if (ret < 0) {
error_setg_errno(errp, errno, "Failed to get time");
return -1;
}
time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
return time_ns;
}
void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
{
int ret;
int status;
pid_t pid;
Error *local_err = NULL;
struct timeval tv;
/* If user has passed a time, validate and set it. */
if (has_time) {
GDate date = { 0, };
/* year-2038 will overflow in case time_t is 32bit */
if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
error_setg(errp, "Time %" PRId64 " is too large", time_ns);
return;
}
tv.tv_sec = time_ns / 1000000000;
tv.tv_usec = (time_ns % 1000000000) / 1000;
g_date_set_time_t(&date, tv.tv_sec);
if (date.year < 1970 || date.year >= 2070) {
error_setg_errno(errp, errno, "Invalid time");
return;
}
ret = settimeofday(&tv, NULL);
if (ret < 0) {
error_setg_errno(errp, errno, "Failed to set time to guest");
return;
}
}
/* Now, if user has passed a time to set and the system time is set, we
* just need to synchronize the hardware clock. However, if no time was
* passed, user is requesting the opposite: set the system time from the
* hardware clock (RTC). */
pid = fork();
if (pid == 0) {
setsid();
reopen_fd_to_null(0);
reopen_fd_to_null(1);
reopen_fd_to_null(2);
/* Use '/sbin/hwclock -w' to set RTC from the system time,
* or '/sbin/hwclock -s' to set the system time from RTC. */
execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s",
NULL, environ);
_exit(EXIT_FAILURE);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
return;
}
ga_wait_child(pid, &status, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!WIFEXITED(status)) {
error_setg(errp, "child process has terminated abnormally");
return;
}
if (WEXITSTATUS(status)) {
error_setg(errp, "hwclock failed to set hardware clock to system time");
return;
}
}
typedef enum {
RW_STATE_NEW,
RW_STATE_READING,
RW_STATE_WRITING,
} RwState;
typedef struct GuestFileHandle {
uint64_t id;
FILE *fh;
RwState state;
QTAILQ_ENTRY(GuestFileHandle) next;
} GuestFileHandle;
static struct {
QTAILQ_HEAD(, GuestFileHandle) filehandles;
} guest_file_state = {
.filehandles = QTAILQ_HEAD_INITIALIZER(guest_file_state.filehandles),
};
static int64_t guest_file_handle_add(FILE *fh, Error **errp)
{
GuestFileHandle *gfh;
int64_t handle;
handle = ga_get_fd_handle(ga_state, errp);
if (handle < 0) {
return -1;
}
gfh = g_new0(GuestFileHandle, 1);
gfh->id = handle;
gfh->fh = fh;
QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
return handle;
}
static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
{
GuestFileHandle *gfh;
QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
{
if (gfh->id == id) {
return gfh;
}
}
error_setg(errp, "handle '%" PRId64 "' has not been found", id);
return NULL;
}
typedef const char * const ccpc;
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
static const struct {
ccpc *forms;
int oflag_base;
} guest_file_open_modes[] = {
{ (ccpc[]){ "r", NULL }, O_RDONLY },
{ (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY },
{ (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC },
{ (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY },
{ (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND },
{ (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
{ (ccpc[]){ "r+", NULL }, O_RDWR },
{ (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY },
{ (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC },
{ (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY },
{ (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND },
{ (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY }
};
static int
find_open_flag(const char *mode_str, Error **errp)
{
unsigned mode;
for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
ccpc *form;
form = guest_file_open_modes[mode].forms;
while (*form != NULL && strcmp(*form, mode_str) != 0) {
++form;
}
if (*form != NULL) {
break;
}
}
if (mode == ARRAY_SIZE(guest_file_open_modes)) {
error_setg(errp, "invalid file open mode '%s'", mode_str);
return -1;
}
return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
}
#define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
S_IRGRP | S_IWGRP | \
S_IROTH | S_IWOTH)
static FILE *
safe_open_or_create(const char *path, const char *mode, Error **errp)
{
Error *local_err = NULL;
int oflag;
oflag = find_open_flag(mode, &local_err);
if (local_err == NULL) {
int fd;
/* If the caller wants / allows creation of a new file, we implement it
* with a two step process: open() + (open() / fchmod()).
*
* First we insist on creating the file exclusively as a new file. If
* that succeeds, we're free to set any file-mode bits on it. (The
* motivation is that we want to set those file-mode bits independently
* of the current umask.)
*
* If the exclusive creation fails because the file already exists
* (EEXIST is not possible for any other reason), we just attempt to
* open the file, but in this case we won't be allowed to change the
* file-mode bits on the preexistent file.
*
* The pathname should never disappear between the two open()s in
* practice. If it happens, then someone very likely tried to race us.
* In this case just go ahead and report the ENOENT from the second
* open() to the caller.
*
* If the caller wants to open a preexistent file, then the first
* open() is decisive and its third argument is ignored, and the second
* open() and the fchmod() are never called.
*/
fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
if (fd == -1 && errno == EEXIST) {
oflag &= ~(unsigned)O_CREAT;
fd = open(path, oflag);
}
if (fd == -1) {
error_setg_errno(&local_err, errno, "failed to open file '%s' "
"(mode: '%s')", path, mode);
} else {
qemu_set_cloexec(fd);
if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
error_setg_errno(&local_err, errno, "failed to set permission "
"0%03o on new file '%s' (mode: '%s')",
(unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
} else {
FILE *f;
f = fdopen(fd, mode);
if (f == NULL) {
error_setg_errno(&local_err, errno, "failed to associate "
"stdio stream with file descriptor %d, "
"file '%s' (mode: '%s')", fd, path, mode);
} else {
return f;
}
}
close(fd);
if (oflag & O_CREAT) {
unlink(path);
}
}
}
error_propagate(errp, local_err);
return NULL;
}
int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
Error **errp)
{
FILE *fh;
Error *local_err = NULL;
int64_t handle;
if (!has_mode) {
mode = "r";
}
slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
fh = safe_open_or_create(path, mode, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return -1;
}
/* set fd non-blocking to avoid common use cases (like reading from a
* named pipe) from hanging the agent
*/
qemu_set_nonblock(fileno(fh));
handle = guest_file_handle_add(fh, errp);
if (handle < 0) {
fclose(fh);
return -1;
}
slog("guest-file-open, handle: %" PRId64, handle);
return handle;
}
void qmp_guest_file_close(int64_t handle, Error **errp)
{
GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
int ret;
slog("guest-file-close called, handle: %" PRId64, handle);
if (!gfh) {
return;
}
ret = fclose(gfh->fh);
if (ret == EOF) {
error_setg_errno(errp, errno, "failed to close handle");
return;
}
QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
g_free(gfh);
}
struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
int64_t count, Error **errp)
{
GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
GuestFileRead *read_data = NULL;
guchar *buf;
FILE *fh;
size_t read_count;
if (!gfh) {
return NULL;
}
if (!has_count) {
count = QGA_READ_COUNT_DEFAULT;
} else if (count < 0) {
error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
count);
return NULL;
}
fh = gfh->fh;
/* explicitly flush when switching from writing to reading */
if (gfh->state == RW_STATE_WRITING) {
int ret = fflush(fh);
if (ret == EOF) {
error_setg_errno(errp, errno, "failed to flush file");
return NULL;
}
gfh->state = RW_STATE_NEW;
}
buf = g_malloc0(count+1);
read_count = fread(buf, 1, count, fh);
if (ferror(fh)) {
error_setg_errno(errp, errno, "failed to read file");
slog("guest-file-read failed, handle: %" PRId64, handle);
} else {
buf[read_count] = 0;
read_data = g_new0(GuestFileRead, 1);
read_data->count = read_count;
read_data->eof = feof(fh);
if (read_count) {
read_data->buf_b64 = g_base64_encode(buf, read_count);
}
gfh->state = RW_STATE_READING;
}
g_free(buf);
clearerr(fh);
return read_data;
}
GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
bool has_count, int64_t count,
Error **errp)
{
GuestFileWrite *write_data = NULL;
guchar *buf;
gsize buf_len;
int write_count;
GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
FILE *fh;
if (!gfh) {
return NULL;
}
fh = gfh->fh;
if (gfh->state == RW_STATE_READING) {
int ret = fseek(fh, 0, SEEK_CUR);
if (ret == -1) {
error_setg_errno(errp, errno, "failed to seek file");
return NULL;
}
gfh->state = RW_STATE_NEW;
}
buf = qbase64_decode(buf_b64, -1, &buf_len, errp);
if (!buf) {
return NULL;
}
if (!has_count) {
count = buf_len;
} else if (count < 0 || count > buf_len) {
error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
count);
g_free(buf);
return NULL;
}
write_count = fwrite(buf, 1, count, fh);
if (ferror(fh)) {
error_setg_errno(errp, errno, "failed to write to file");
slog("guest-file-write failed, handle: %" PRId64, handle);
} else {
write_data = g_new0(GuestFileWrite, 1);
write_data->count = write_count;
write_data->eof = feof(fh);
gfh->state = RW_STATE_WRITING;
}
g_free(buf);
clearerr(fh);
return write_data;
}
struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
GuestFileWhence *whence_code,
Error **errp)
{
GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
GuestFileSeek *seek_data = NULL;
FILE *fh;
int ret;
int whence;
Error *err = NULL;
if (!gfh) {
return NULL;
}
/* We stupidly exposed 'whence':'int' in our qapi */
whence = ga_parse_whence(whence_code, &err);
if (err) {
error_propagate(errp, err);
return NULL;
}
fh = gfh->fh;
ret = fseek(fh, offset, whence);
if (ret == -1) {
error_setg_errno(errp, errno, "failed to seek file");
if (errno == ESPIPE) {
/* file is non-seekable, stdio shouldn't be buffering anyways */
gfh->state = RW_STATE_NEW;
}
} else {
seek_data = g_new0(GuestFileSeek, 1);
seek_data->position = ftell(fh);
seek_data->eof = feof(fh);
gfh->state = RW_STATE_NEW;
}
clearerr(fh);
return seek_data;
}
void qmp_guest_file_flush(int64_t handle, Error **errp)
{
GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
FILE *fh;
int ret;
if (!gfh) {
return;
}
fh = gfh->fh;
ret = fflush(fh);
if (ret == EOF) {
error_setg_errno(errp, errno, "failed to flush file");
} else {
gfh->state = RW_STATE_NEW;
}
}
/* linux-specific implementations. avoid this if at all possible. */
#if defined(__linux__)
#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
typedef struct FsMount {
char *dirname;
char *devtype;
unsigned int devmajor, devminor;
QTAILQ_ENTRY(FsMount) next;
} FsMount;
typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList;
static void free_fs_mount_list(FsMountList *mounts)
{
FsMount *mount, *temp;
if (!mounts) {
return;
}
QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
QTAILQ_REMOVE(mounts, mount, next);
g_free(mount->dirname);
g_free(mount->devtype);
g_free(mount);
}
}
static int dev_major_minor(const char *devpath,
unsigned int *devmajor, unsigned int *devminor)
{
struct stat st;
*devmajor = 0;
*devminor = 0;
if (stat(devpath, &st) < 0) {
slog("failed to stat device file '%s': %s", devpath, strerror(errno));
return -1;
}
if (S_ISDIR(st.st_mode)) {
/* It is bind mount */
return -2;
}
if (S_ISBLK(st.st_mode)) {
*devmajor = major(st.st_rdev);
*devminor = minor(st.st_rdev);
return 0;
}
return -1;
}
/*
* Walk the mount table and build a list of local file systems
*/
static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
{
struct mntent *ment;
FsMount *mount;
char const *mtab = "/proc/self/mounts";
FILE *fp;
unsigned int devmajor, devminor;
fp = setmntent(mtab, "r");
if (!fp) {
error_setg(errp, "failed to open mtab file: '%s'", mtab);
return;
}
while ((ment = getmntent(fp))) {
/*
* An entry which device name doesn't start with a '/' is
* either a dummy file system or a network file system.
* Add special handling for smbfs and cifs as is done by
* coreutils as well.
*/
if ((ment->mnt_fsname[0] != '/') ||
(strcmp(ment->mnt_type, "smbfs") == 0) ||
(strcmp(ment->mnt_type, "cifs") == 0)) {
continue;
}
if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
/* Skip bind mounts */
continue;
}
mount = g_new0(FsMount, 1);
mount->dirname = g_strdup(ment->mnt_dir);
mount->devtype = g_strdup(ment->mnt_type);
mount->devmajor = devmajor;
mount->devminor = devminor;
QTAILQ_INSERT_TAIL(mounts, mount, next);
}
endmntent(fp);
}
static void decode_mntname(char *name, int len)
{
int i, j = 0;
for (i = 0; i <= len; i++) {
if (name[i] != '\\') {
name[j++] = name[i];
} else if (name[i + 1] == '\\') {
name[j++] = '\\';
i++;
} else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
name[i + 2] >= '0' && name[i + 2] <= '7' &&
name[i + 3] >= '0' && name[i + 3] <= '7') {
name[j++] = (name[i + 1] - '0') * 64 +
(name[i + 2] - '0') * 8 +
(name[i + 3] - '0');
i += 3;
} else {
name[j++] = name[i];
}
}
}
static void build_fs_mount_list(FsMountList *mounts, Error **errp)
{
FsMount *mount;
char const *mountinfo = "/proc/self/mountinfo";
FILE *fp;
char *line = NULL, *dash;
size_t n;
char check;
unsigned int devmajor, devminor;
int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
fp = fopen(mountinfo, "r");
if (!fp) {
build_fs_mount_list_from_mtab(mounts, errp);
return;
}
while (getline(&line, &n, fp) != -1) {
ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
&devmajor, &devminor, &dir_s, &dir_e, &check);
if (ret < 3) {
continue;
}
dash = strstr(line + dir_e, " - ");
if (!dash) {
continue;
}
ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
&type_s, &type_e, &dev_s, &dev_e, &check);
if (ret < 1) {
continue;
}
line[dir_e] = 0;
dash[type_e] = 0;
dash[dev_e] = 0;
decode_mntname(line + dir_s, dir_e - dir_s);
decode_mntname(dash + dev_s, dev_e - dev_s);
if (devmajor == 0) {
/* btrfs reports major number = 0 */
if (strcmp("btrfs", dash + type_s) != 0 ||
dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
continue;
}
}
mount = g_new0(FsMount, 1);
mount->dirname = g_strdup(line + dir_s);
mount->devtype = g_strdup(dash + type_s);
mount->devmajor = devmajor;
mount->devminor = devminor;
QTAILQ_INSERT_TAIL(mounts, mount, next);
}
free(line);
fclose(fp);
}
#endif
#if defined(CONFIG_FSFREEZE)
static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
{
char *path;
char *dpath;
char *driver = NULL;
char buf[PATH_MAX];
ssize_t len;
path = g_strndup(syspath, pathlen);
dpath = g_strdup_printf("%s/driver", path);
len = readlink(dpath, buf, sizeof(buf) - 1);
if (len != -1) {
buf[len] = 0;
driver = g_strdup(basename(buf));
}
g_free(dpath);
g_free(path);
return driver;
}
static int compare_uint(const void *_a, const void *_b)
{
unsigned int a = *(unsigned int *)_a;
unsigned int b = *(unsigned int *)_b;
return a < b ? -1 : a > b ? 1 : 0;
}
/* Walk the specified sysfs and build a sorted list of host or ata numbers */
static int build_hosts(char const *syspath, char const *host, bool ata,
unsigned int *hosts, int hosts_max, Error **errp)
{
char *path;
DIR *dir;
struct dirent *entry;
int i = 0;
path = g_strndup(syspath, host - syspath);
dir = opendir(path);
if (!dir) {
error_setg_errno(errp, errno, "opendir(\"%s\")", path);
g_free(path);
return -1;
}
while (i < hosts_max) {
entry = readdir(dir);
if (!entry) {
break;
}
if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
++i;
} else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
++i;
}
}
qsort(hosts, i, sizeof(hosts[0]), compare_uint);
g_free(path);
closedir(dir);
return i;
}
/* Store disk device info specified by @sysfs into @fs */
static void build_guest_fsinfo_for_real_device(char const *syspath,
GuestFilesystemInfo *fs,
Error **errp)
{
unsigned int pci[4], host, hosts[8], tgt[3];
int i, nhosts = 0, pcilen;
GuestDiskAddress *disk;
GuestPCIAddress *pciaddr;
GuestDiskAddressList *list = NULL;
bool has_ata = false, has_host = false, has_tgt = false;
char *p, *q, *driver = NULL;
p = strstr(syspath, "/devices/pci");
if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
return;
}
driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
if (!driver) {
goto cleanup;
}
p = strstr(syspath, "/target");
if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
tgt, tgt + 1, tgt + 2) == 3) {
has_tgt = true;
}
p = strstr(syspath, "/ata");
if (p) {
q = p + 4;
has_ata = true;
} else {
p = strstr(syspath, "/host");
q = p + 5;
}
if (p && sscanf(q, "%u", &host) == 1) {
has_host = true;
nhosts = build_hosts(syspath, p, has_ata, hosts,
sizeof(hosts) / sizeof(hosts[0]), errp);
if (nhosts < 0) {
goto cleanup;
}
}
pciaddr = g_malloc0(sizeof(*pciaddr));
pciaddr->domain = pci[0];
pciaddr->bus = pci[1];
pciaddr->slot = pci[2];
pciaddr->function = pci[3];
disk = g_malloc0(sizeof(*disk));
disk->pci_controller = pciaddr;
list = g_malloc0(sizeof(*list));
list->value = disk;
if (strcmp(driver, "ata_piix") == 0) {
/* a host per ide bus, target*:0:<unit>:0 */
if (!has_host || !has_tgt) {
g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
for (i = 0; i < nhosts; i++) {
if (host == hosts[i]) {
disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
disk->bus = i;
disk->unit = tgt[1];
break;
}
}
if (i >= nhosts) {
g_debug("no host for '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
} else if (strcmp(driver, "sym53c8xx") == 0) {
/* scsi(LSI Logic): target*:0:<unit>:0 */
if (!has_tgt) {
g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
disk->unit = tgt[1];
} else if (strcmp(driver, "virtio-pci") == 0) {
if (has_tgt) {
/* virtio-scsi: target*:0:0:<unit> */
disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
disk->unit = tgt[2];
} else {
/* virtio-blk: 1 disk per 1 device */
disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
}
} else if (strcmp(driver, "ahci") == 0) {
/* ahci: 1 host per 1 unit */
if (!has_host || !has_tgt) {
g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
for (i = 0; i < nhosts; i++) {
if (host == hosts[i]) {
disk->unit = i;
disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
break;
}
}
if (i >= nhosts) {
g_debug("no host for '%s' (driver '%s')", syspath, driver);
goto cleanup;
}
} else {
g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
goto cleanup;
}
list->next = fs->disk;
fs->disk = list;
g_free(driver);
return;
cleanup:
if (list) {
qapi_free_GuestDiskAddressList(list);
}
g_free(driver);
}
static void build_guest_fsinfo_for_device(char const *devpath,
GuestFilesystemInfo *fs,
Error **errp);
/* Store a list of slave devices of virtual volume specified by @syspath into
* @fs */
static void build_guest_fsinfo_for_virtual_device(char const *syspath,
GuestFilesystemInfo *fs,
Error **errp)
{
DIR *dir;
char *dirpath;
struct dirent *entry;
dirpath = g_strdup_printf("%s/slaves", syspath);
dir = opendir(dirpath);
if (!dir) {
error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
g_free(dirpath);
return;
}
for (;;) {
errno = 0;
entry = readdir(dir);
if (entry == NULL) {
if (errno) {
error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
}
break;
}
if (entry->d_type == DT_LNK) {
char *path;
g_debug(" slave device '%s'", entry->d_name);
path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
build_guest_fsinfo_for_device(path, fs, errp);
g_free(path);
if (*errp) {
break;
}
}
}
g_free(dirpath);
closedir(dir);
}
/* Dispatch to functions for virtual/real device */
static void build_guest_fsinfo_for_device(char const *devpath,
GuestFilesystemInfo *fs,
Error **errp)
{
char *syspath = realpath(devpath, NULL);
if (!syspath) {
error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
return;
}
if (!fs->name) {
fs->name = g_strdup(basename(syspath));
}
g_debug(" parse sysfs path '%s'", syspath);
if (strstr(syspath, "/devices/virtual/block/")) {
build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
} else {
build_guest_fsinfo_for_real_device(syspath, fs, errp);
}
free(syspath);
}
/* Return a list of the disk device(s)' info which @mount lies on */
static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
Error **errp)
{
GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
mount->devmajor, mount->devminor);
fs->mountpoint = g_strdup(mount->dirname);
fs->type = g_strdup(mount->devtype);
build_guest_fsinfo_for_device(devpath, fs, errp);
g_free(devpath);
return fs;
}
GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
{
FsMountList mounts;
struct FsMount *mount;
GuestFilesystemInfoList *new, *ret = NULL;
Error *local_err = NULL;
QTAILQ_INIT(&mounts);
build_fs_mount_list(&mounts, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return NULL;
}
QTAILQ_FOREACH(mount, &mounts, next) {
g_debug("Building guest fsinfo for '%s'", mount->dirname);
new = g_malloc0(sizeof(*ret));
new->value = build_guest_fsinfo(mount, &local_err);
new->next = ret;
ret = new;
if (local_err) {
error_propagate(errp, local_err);
qapi_free_GuestFilesystemInfoList(ret);
ret = NULL;
break;
}
}
free_fs_mount_list(&mounts);
return ret;
}
typedef enum {
FSFREEZE_HOOK_THAW = 0,
FSFREEZE_HOOK_FREEZE,
} FsfreezeHookArg;
static const char *fsfreeze_hook_arg_string[] = {
"thaw",
"freeze",
};
static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
{
int status;
pid_t pid;
const char *hook;
const char *arg_str = fsfreeze_hook_arg_string[arg];
Error *local_err = NULL;
hook = ga_fsfreeze_hook(ga_state);
if (!hook) {
return;
}
if (access(hook, X_OK) != 0) {
error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
return;
}
slog("executing fsfreeze hook with arg '%s'", arg_str);
pid = fork();
if (pid == 0) {
setsid();
reopen_fd_to_null(0);
reopen_fd_to_null(1);
reopen_fd_to_null(2);
execle(hook, hook, arg_str, NULL, environ);
_exit(EXIT_FAILURE);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
return;
}
ga_wait_child(pid, &status, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!WIFEXITED(status)) {
error_setg(errp, "fsfreeze hook has terminated abnormally");
return;
}
status = WEXITSTATUS(status);
if (status) {
error_setg(errp, "fsfreeze hook has failed with status %d", status);
return;
}
}
/*
* Return status of freeze/thaw
*/
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
{
if (ga_is_frozen(ga_state)) {
return GUEST_FSFREEZE_STATUS_FROZEN;
}
return GUEST_FSFREEZE_STATUS_THAWED;
}
int64_t qmp_guest_fsfreeze_freeze(Error **errp)
{
return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
}
/*
* Walk list of mounted file systems in the guest, and freeze the ones which
* are real local file systems.
*/
int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
strList *mountpoints,
Error **errp)
{
int ret = 0, i = 0;
strList *list;
FsMountList mounts;
struct FsMount *mount;
Error *local_err = NULL;
int fd;
slog("guest-fsfreeze called");
execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return -1;
}
QTAILQ_INIT(&mounts);
build_fs_mount_list(&mounts, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return -1;
}
/* cannot risk guest agent blocking itself on a write in this state */
ga_set_frozen(ga_state);
QTAILQ_FOREACH_REVERSE(mount, &mounts, FsMountList, next) {
/* To issue fsfreeze in the reverse order of mounts, check if the
* mount is listed in the list here */
if (has_mountpoints) {
for (list = mountpoints; list; list = list->next) {
if (strcmp(list->value, mount->dirname) == 0) {
break;
}
}
if (!list) {
continue;
}
}
fd = qemu_open(mount->dirname, O_RDONLY);
if (fd == -1) {
error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
goto error;
}
/* we try to cull filesystems we know won't work in advance, but other
* filesystems may not implement fsfreeze for less obvious reasons.
* these will report EOPNOTSUPP. we simply ignore these when tallying
* the number of frozen filesystems.
*
* any other error means a failure to freeze a filesystem we
* expect to be freezable, so return an error in those cases
* and return system to thawed state.
*/
ret = ioctl(fd, FIFREEZE);
if (ret == -1) {
if (errno != EOPNOTSUPP) {
error_setg_errno(errp, errno, "failed to freeze %s",
mount->dirname);
close(fd);
goto error;
}
} else {
i++;
}
close(fd);
}
free_fs_mount_list(&mounts);
return i;
error:
free_fs_mount_list(&mounts);
qmp_guest_fsfreeze_thaw(NULL);
return 0;
}
/*
* Walk list of frozen file systems in the guest, and thaw them.
*/
int64_t qmp_guest_fsfreeze_thaw(Error **errp)
{
int ret;
FsMountList mounts;
FsMount *mount;
int fd, i = 0, logged;
Error *local_err = NULL;
QTAILQ_INIT(&mounts);
build_fs_mount_list(&mounts, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return 0;
}
QTAILQ_FOREACH(mount, &mounts, next) {
logged = false;
fd = qemu_open(mount->dirname, O_RDONLY);
if (fd == -1) {
continue;
}
/* we have no way of knowing whether a filesystem was actually unfrozen
* as a result of a successful call to FITHAW, only that if an error
* was returned the filesystem was *not* unfrozen by that particular
* call.
*
* since multiple preceding FIFREEZEs require multiple calls to FITHAW
* to unfreeze, continuing issuing FITHAW until an error is returned,
* in which case either the filesystem is in an unfreezable state, or,
* more likely, it was thawed previously (and remains so afterward).
*
* also, since the most recent successful call is the one that did
* the actual unfreeze, we can use this to provide an accurate count
* of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
* may * be useful for determining whether a filesystem was unfrozen
* during the freeze/thaw phase by a process other than qemu-ga.
*/
do {
ret = ioctl(fd, FITHAW);
if (ret == 0 && !logged) {
i++;
logged = true;
}
} while (ret == 0);
close(fd);
}
ga_unset_frozen(ga_state);
free_fs_mount_list(&mounts);
execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
return i;
}
static void guest_fsfreeze_cleanup(void)
{
Error *err = NULL;
if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
qmp_guest_fsfreeze_thaw(&err);
if (err) {
slog("failed to clean up frozen filesystems: %s",
error_get_pretty(err));
error_free(err);
}
}
}
#endif /* CONFIG_FSFREEZE */
#if defined(CONFIG_FSTRIM)
/*
* Walk list of mounted file systems in the guest, and trim them.
*/
GuestFilesystemTrimResponse *
qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
{
GuestFilesystemTrimResponse *response;
GuestFilesystemTrimResultList *list;
GuestFilesystemTrimResult *result;
int ret = 0;
FsMountList mounts;
struct FsMount *mount;
int fd;
Error *local_err = NULL;
struct fstrim_range r;
slog("guest-fstrim called");
QTAILQ_INIT(&mounts);
build_fs_mount_list(&mounts, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return NULL;
}
response = g_malloc0(sizeof(*response));
QTAILQ_FOREACH(mount, &mounts, next) {
result = g_malloc0(sizeof(*result));
result->path = g_strdup(mount->dirname);
list = g_malloc0(sizeof(*list));
list->value = result;
list->next = response->paths;
response->paths = list;
fd = qemu_open(mount->dirname, O_RDONLY);
if (fd == -1) {
result->error = g_strdup_printf("failed to open: %s",
strerror(errno));
result->has_error = true;
continue;
}
/* We try to cull filesystems we know won't work in advance, but other
* filesystems may not implement fstrim for less obvious reasons.
* These will report EOPNOTSUPP; while in some other cases ENOTTY
* will be reported (e.g. CD-ROMs).
* Any other error means an unexpected error.
*/
r.start = 0;
r.len = -1;
r.minlen = has_minimum ? minimum : 0;
ret = ioctl(fd, FITRIM, &r);
if (ret == -1) {
result->has_error = true;
if (errno == ENOTTY || errno == EOPNOTSUPP) {
result->error = g_strdup("trim not supported");
} else {
result->error = g_strdup_printf("failed to trim: %s",
strerror(errno));
}
close(fd);
continue;
}
result->has_minimum = true;
result->minimum = r.minlen;
result->has_trimmed = true;
result->trimmed = r.len;
close(fd);
}
free_fs_mount_list(&mounts);
return response;
}
#endif /* CONFIG_FSTRIM */
#define LINUX_SYS_STATE_FILE "/sys/power/state"
#define SUSPEND_SUPPORTED 0
#define SUSPEND_NOT_SUPPORTED 1
static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
const char *sysfile_str, Error **errp)
{
Error *local_err = NULL;
char *pmutils_path;
pid_t pid;
int status;
pmutils_path = g_find_program_in_path(pmutils_bin);
pid = fork();
if (!pid) {
char buf[32]; /* hopefully big enough */
ssize_t ret;
int fd;
setsid();
reopen_fd_to_null(0);
reopen_fd_to_null(1);
reopen_fd_to_null(2);
if (pmutils_path) {
execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
}
/*
* If we get here either pm-utils is not installed or execle() has
* failed. Let's try the manual method if the caller wants it.
*/
if (!sysfile_str) {
_exit(SUSPEND_NOT_SUPPORTED);
}
fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
if (fd < 0) {
_exit(SUSPEND_NOT_SUPPORTED);
}
ret = read(fd, buf, sizeof(buf)-1);
if (ret <= 0) {
_exit(SUSPEND_NOT_SUPPORTED);
}
buf[ret] = '\0';
if (strstr(buf, sysfile_str)) {
_exit(SUSPEND_SUPPORTED);
}
_exit(SUSPEND_NOT_SUPPORTED);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
goto out;
}
ga_wait_child(pid, &status, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
if (!WIFEXITED(status)) {
error_setg(errp, "child process has terminated abnormally");
goto out;
}
switch (WEXITSTATUS(status)) {
case SUSPEND_SUPPORTED:
goto out;
case SUSPEND_NOT_SUPPORTED:
error_setg(errp,
"the requested suspend mode is not supported by the guest");
goto out;
default:
error_setg(errp,
"the helper program '%s' returned an unexpected exit status"
" code (%d)", pmutils_path, WEXITSTATUS(status));
goto out;
}
out:
g_free(pmutils_path);
}
static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
Error **errp)
{
Error *local_err = NULL;
char *pmutils_path;
pid_t pid;
int status;
pmutils_path = g_find_program_in_path(pmutils_bin);
pid = fork();
if (pid == 0) {
/* child */
int fd;
setsid();
reopen_fd_to_null(0);
reopen_fd_to_null(1);
reopen_fd_to_null(2);
if (pmutils_path) {
execle(pmutils_path, pmutils_bin, NULL, environ);
}
/*
* If we get here either pm-utils is not installed or execle() has
* failed. Let's try the manual method if the caller wants it.
*/
if (!sysfile_str) {
_exit(EXIT_FAILURE);
}
fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
if (fd < 0) {
_exit(EXIT_FAILURE);
}
if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
goto out;
}
ga_wait_child(pid, &status, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
if (!WIFEXITED(status)) {
error_setg(errp, "child process has terminated abnormally");
goto out;
}
if (WEXITSTATUS(status)) {
error_setg(errp, "child process has failed to suspend");
goto out;
}
out:
g_free(pmutils_path);
}
void qmp_guest_suspend_disk(Error **errp)
{
Error *local_err = NULL;
bios_supports_mode("pm-is-supported", "--hibernate", "disk", &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
guest_suspend("pm-hibernate", "disk", errp);
}
void qmp_guest_suspend_ram(Error **errp)
{
Error *local_err = NULL;
bios_supports_mode("pm-is-supported", "--suspend", "mem", &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
guest_suspend("pm-suspend", "mem", errp);
}
void qmp_guest_suspend_hybrid(Error **errp)
{
Error *local_err = NULL;
bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
guest_suspend("pm-suspend-hybrid", NULL, errp);
}
static GuestNetworkInterfaceList *
guest_find_interface(GuestNetworkInterfaceList *head,
const char *name)
{
for (; head; head = head->next) {
if (strcmp(head->value->name, name) == 0) {
break;
}
}
return head;
}
/*
* Build information about guest interfaces
*/
GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
{
GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) < 0) {
error_setg_errno(errp, errno, "getifaddrs failed");
goto error;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
GuestNetworkInterfaceList *info;
GuestIpAddressList **address_list = NULL, *address_item = NULL;
char addr4[INET_ADDRSTRLEN];
char addr6[INET6_ADDRSTRLEN];
int sock;
struct ifreq ifr;
unsigned char *mac_addr;
void *p;
g_debug("Processing %s interface", ifa->ifa_name);
info = guest_find_interface(head, ifa->ifa_name);
if (!info) {
info = g_malloc0(sizeof(*info));
info->value = g_malloc0(sizeof(*info->value));
info->value->name = g_strdup(ifa->ifa_name);
if (!cur_item) {
head = cur_item = info;
} else {
cur_item->next = info;
cur_item = info;
}
}
if (!info->value->has_hardware_address &&
ifa->ifa_flags & SIOCGIFHWADDR) {
/* we haven't obtained HW address yet */
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock == -1) {
error_setg_errno(errp, errno, "failed to create socket");
goto error;
}
memset(&ifr, 0, sizeof(ifr));
pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
error_setg_errno(errp, errno,
"failed to get MAC address of %s",
ifa->ifa_name);
close(sock);
goto error;
}
close(sock);
mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
info->value->hardware_address =
g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
(int) mac_addr[0], (int) mac_addr[1],
(int) mac_addr[2], (int) mac_addr[3],
(int) mac_addr[4], (int) mac_addr[5]);
info->value->has_hardware_address = true;
}
if (ifa->ifa_addr &&
ifa->ifa_addr->sa_family == AF_INET) {
/* interface with IPv4 address */
p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
error_setg_errno(errp, errno, "inet_ntop failed");
goto error;
}
address_item = g_malloc0(sizeof(*address_item));
address_item->value = g_malloc0(sizeof(*address_item->value));
address_item->value->ip_address = g_strdup(addr4);
address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
if (ifa->ifa_netmask) {
/* Count the number of set bits in netmask.
* This is safe as '1' and '0' cannot be shuffled in netmask. */
p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
}
} else if (ifa->ifa_addr &&
ifa->ifa_addr->sa_family == AF_INET6) {
/* interface with IPv6 address */
p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
error_setg_errno(errp, errno, "inet_ntop failed");
goto error;
}
address_item = g_malloc0(sizeof(*address_item));
address_item->value = g_malloc0(sizeof(*address_item->value));
address_item->value->ip_address = g_strdup(addr6);
address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
if (ifa->ifa_netmask) {
/* Count the number of set bits in netmask.
* This is safe as '1' and '0' cannot be shuffled in netmask. */
p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
address_item->value->prefix =
ctpop32(((uint32_t *) p)[0]) +
ctpop32(((uint32_t *) p)[1]) +
ctpop32(((uint32_t *) p)[2]) +
ctpop32(((uint32_t *) p)[3]);
}
}
if (!address_item) {
continue;
}
address_list = &info->value->ip_addresses;
while (*address_list && (*address_list)->next) {
address_list = &(*address_list)->next;
}
if (!*address_list) {
*address_list = address_item;
} else {
(*address_list)->next = address_item;
}
info->value->has_ip_addresses = true;
}
freeifaddrs(ifap);
return head;
error:
freeifaddrs(ifap);
qapi_free_GuestNetworkInterfaceList(head);
return NULL;
}
#define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
static long sysconf_exact(int name, const char *name_str, Error **errp)
{
long ret;
errno = 0;
ret = sysconf(name);
if (ret == -1) {
if (errno == 0) {
error_setg(errp, "sysconf(%s): value indefinite", name_str);
} else {
error_setg_errno(errp, errno, "sysconf(%s)", name_str);
}
}
return ret;
}
/* Transfer online/offline status between @vcpu and the guest system.
*
* On input either @errp or *@errp must be NULL.
*
* In system-to-@vcpu direction, the following @vcpu fields are accessed:
* - R: vcpu->logical_id
* - W: vcpu->online
* - W: vcpu->can_offline
*
* In @vcpu-to-system direction, the following @vcpu fields are accessed:
* - R: vcpu->logical_id
* - R: vcpu->online
*
* Written members remain unmodified on error.
*/
static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
Error **errp)
{
char *dirpath;
int dirfd;
dirpath = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
vcpu->logical_id);
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
} else {
static const char fn[] = "online";
int fd;
int res;
fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
if (fd == -1) {
if (errno != ENOENT) {
error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
} else if (sys2vcpu) {
vcpu->online = true;
vcpu->can_offline = false;
} else if (!vcpu->online) {
error_setg(errp, "logical processor #%" PRId64 " can't be "
"offlined", vcpu->logical_id);
} /* otherwise pretend successful re-onlining */
} else {
unsigned char status;
res = pread(fd, &status, 1, 0);
if (res == -1) {
error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
} else if (res == 0) {
error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
fn);
} else if (sys2vcpu) {
vcpu->online = (status != '0');
vcpu->can_offline = true;
} else if (vcpu->online != (status != '0')) {
status = '0' + vcpu->online;
if (pwrite(fd, &status, 1, 0) == -1) {
error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
fn);
}
} /* otherwise pretend successful re-(on|off)-lining */
res = close(fd);
g_assert(res == 0);
}
res = close(dirfd);
g_assert(res == 0);
}
g_free(dirpath);
}
GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
{
int64_t current;
GuestLogicalProcessorList *head, **link;
long sc_max;
Error *local_err = NULL;
current = 0;
head = NULL;
link = &head;
sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
while (local_err == NULL && current < sc_max) {
GuestLogicalProcessor *vcpu;
GuestLogicalProcessorList *entry;
vcpu = g_malloc0(sizeof *vcpu);
vcpu->logical_id = current++;
vcpu->has_can_offline = true; /* lolspeak ftw */
transfer_vcpu(vcpu, true, &local_err);
entry = g_malloc0(sizeof *entry);
entry->value = vcpu;
*link = entry;
link = &entry->next;
}
if (local_err == NULL) {
/* there's no guest with zero VCPUs */
g_assert(head != NULL);
return head;
}
qapi_free_GuestLogicalProcessorList(head);
error_propagate(errp, local_err);
return NULL;
}
int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
{
int64_t processed;
Error *local_err = NULL;
processed = 0;
while (vcpus != NULL) {
transfer_vcpu(vcpus->value, false, &local_err);
if (local_err != NULL) {
break;
}
++processed;
vcpus = vcpus->next;
}
if (local_err != NULL) {
if (processed == 0) {
error_propagate(errp, local_err);
} else {
error_free(local_err);
}
}
return processed;
}
void qmp_guest_set_user_password(const char *username,
const char *password,
bool crypted,
Error **errp)
{
Error *local_err = NULL;
char *passwd_path = NULL;
pid_t pid;
int status;
int datafd[2] = { -1, -1 };
char *rawpasswddata = NULL;
size_t rawpasswdlen;
char *chpasswddata = NULL;
size_t chpasswdlen;
rawpasswddata = (char *)qbase64_decode(password, -1, &rawpasswdlen, errp);
if (!rawpasswddata) {
return;
}
rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
rawpasswddata[rawpasswdlen] = '\0';
if (strchr(rawpasswddata, '\n')) {
error_setg(errp, "forbidden characters in raw password");
goto out;
}
if (strchr(username, '\n') ||
strchr(username, ':')) {
error_setg(errp, "forbidden characters in username");
goto out;
}
chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
chpasswdlen = strlen(chpasswddata);
passwd_path = g_find_program_in_path("chpasswd");
if (!passwd_path) {
error_setg(errp, "cannot find 'passwd' program in PATH");
goto out;
}
if (pipe(datafd) < 0) {
error_setg(errp, "cannot create pipe FDs");
goto out;
}
pid = fork();
if (pid == 0) {
close(datafd[1]);
/* child */
setsid();
dup2(datafd[0], 0);
reopen_fd_to_null(1);
reopen_fd_to_null(2);
if (crypted) {
execle(passwd_path, "chpasswd", "-e", NULL, environ);
} else {
execle(passwd_path, "chpasswd", NULL, environ);
}
_exit(EXIT_FAILURE);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
goto out;
}
close(datafd[0]);
datafd[0] = -1;
if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
error_setg_errno(errp, errno, "cannot write new account password");
goto out;
}
close(datafd[1]);
datafd[1] = -1;
ga_wait_child(pid, &status, &local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
}
if (!WIFEXITED(status)) {
error_setg(errp, "child process has terminated abnormally");
goto out;
}
if (WEXITSTATUS(status)) {
error_setg(errp, "child process has failed to set user password");
goto out;
}
out:
g_free(chpasswddata);
g_free(rawpasswddata);
g_free(passwd_path);
if (datafd[0] != -1) {
close(datafd[0]);
}
if (datafd[1] != -1) {
close(datafd[1]);
}
}
static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
int size, Error **errp)
{
int fd;
int res;
errno = 0;
fd = openat(dirfd, pathname, O_RDONLY);
if (fd == -1) {
error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
return;
}
res = pread(fd, buf, size, 0);
if (res == -1) {
error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
} else if (res == 0) {
error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
}
close(fd);
}
static void ga_write_sysfs_file(int dirfd, const char *pathname,
const char *buf, int size, Error **errp)
{
int fd;
errno = 0;
fd = openat(dirfd, pathname, O_WRONLY);
if (fd == -1) {
error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
return;
}
if (pwrite(fd, buf, size, 0) == -1) {
error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
}
close(fd);
}
/* Transfer online/offline status between @mem_blk and the guest system.
*
* On input either @errp or *@errp must be NULL.
*
* In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
* - R: mem_blk->phys_index
* - W: mem_blk->online
* - W: mem_blk->can_offline
*
* In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
* - R: mem_blk->phys_index
* - R: mem_blk->online
*- R: mem_blk->can_offline
* Written members remain unmodified on error.
*/
static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
GuestMemoryBlockResponse *result,
Error **errp)
{
char *dirpath;
int dirfd;
char *status;
Error *local_err = NULL;
if (!sys2memblk) {
DIR *dp;
if (!result) {
error_setg(errp, "Internal error, 'result' should not be NULL");
return;
}
errno = 0;
dp = opendir("/sys/devices/system/memory/");
/* if there is no 'memory' directory in sysfs,
* we think this VM does not support online/offline memory block,
* any other solution?
*/
if (!dp && errno == ENOENT) {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
goto out1;
}
closedir(dp);
}
dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
mem_blk->phys_index);
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
if (sys2memblk) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
} else {
if (errno == ENOENT) {
result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
} else {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
}
}
g_free(dirpath);
goto out1;
}
g_free(dirpath);
status = g_malloc0(10);
ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
if (local_err) {
/* treat with sysfs file that not exist in old kernel */
if (errno == ENOENT) {
error_free(local_err);
if (sys2memblk) {
mem_blk->online = true;
mem_blk->can_offline = false;
} else if (!mem_blk->online) {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
}
} else {
if (sys2memblk) {
error_propagate(errp, local_err);
} else {
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
}
}
goto out2;
}
if (sys2memblk) {
char removable = '0';
mem_blk->online = (strncmp(status, "online", 6) == 0);
ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
if (local_err) {
/* if no 'removable' file, it doesn't support offline mem blk */
if (errno == ENOENT) {
error_free(local_err);
mem_blk->can_offline = false;
} else {
error_propagate(errp, local_err);
}
} else {
mem_blk->can_offline = (removable != '0');
}
} else {
if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
char *new_state = mem_blk->online ? g_strdup("online") :
g_strdup("offline");
ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
&local_err);
g_free(new_state);
if (local_err) {
error_free(local_err);
result->response =
GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
goto out2;
}
result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
result->has_error_code = false;
} /* otherwise pretend successful re-(on|off)-lining */
}
g_free(status);
close(dirfd);
return;
out2:
g_free(status);
close(dirfd);
out1:
if (!sys2memblk) {
result->has_error_code = true;
result->error_code = errno;
}
}
GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
{
GuestMemoryBlockList *head, **link;
Error *local_err = NULL;
struct dirent *de;
DIR *dp;
head = NULL;
link = &head;
dp = opendir("/sys/devices/system/memory/");
if (!dp) {
/* it's ok if this happens to be a system that doesn't expose
* memory blocks via sysfs, but otherwise we should report
* an error
*/
if (errno != ENOENT) {
error_setg_errno(errp, errno, "Can't open directory"
"\"/sys/devices/system/memory/\"");
}
return NULL;
}
/* Note: the phys_index of memory block may be discontinuous,
* this is because a memblk is the unit of the Sparse Memory design, which
* allows discontinuous memory ranges (ex. NUMA), so here we should
* traverse the memory block directory.
*/
while ((de = readdir(dp)) != NULL) {
GuestMemoryBlock *mem_blk;
GuestMemoryBlockList *entry;
if ((strncmp(de->d_name, "memory", 6) != 0) ||
!(de->d_type & DT_DIR)) {
continue;
}
mem_blk = g_malloc0(sizeof *mem_blk);
/* The d_name is "memoryXXX", phys_index is block id, same as XXX */
mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
mem_blk->has_can_offline = true; /* lolspeak ftw */
transfer_memory_block(mem_blk, true, NULL, &local_err);
entry = g_malloc0(sizeof *entry);
entry->value = mem_blk;
*link = entry;
link = &entry->next;
}
closedir(dp);
if (local_err == NULL) {
/* there's no guest with zero memory blocks */
if (head == NULL) {
error_setg(errp, "guest reported zero memory blocks!");
}
return head;
}
qapi_free_GuestMemoryBlockList(head);
error_propagate(errp, local_err);
return NULL;
}
GuestMemoryBlockResponseList *
qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
{
GuestMemoryBlockResponseList *head, **link;
Error *local_err = NULL;
head = NULL;
link = &head;
while (mem_blks != NULL) {
GuestMemoryBlockResponse *result;
GuestMemoryBlockResponseList *entry;
GuestMemoryBlock *current_mem_blk = mem_blks->value;
result = g_malloc0(sizeof(*result));
result->phys_index = current_mem_blk->phys_index;
transfer_memory_block(current_mem_blk, false, result, &local_err);
if (local_err) { /* should never happen */
goto err;
}
entry = g_malloc0(sizeof *entry);
entry->value = result;
*link = entry;
link = &entry->next;
mem_blks = mem_blks->next;
}
return head;
err:
qapi_free_GuestMemoryBlockResponseList(head);
error_propagate(errp, local_err);
return NULL;
}
GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
{
Error *local_err = NULL;
char *dirpath;
int dirfd;
char *buf;
GuestMemoryBlockInfo *info;
dirpath = g_strdup_printf("/sys/devices/system/memory/");
dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
if (dirfd == -1) {
error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
g_free(dirpath);
return NULL;
}
g_free(dirpath);
buf = g_malloc0(20);
ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
close(dirfd);
if (local_err) {
g_free(buf);
error_propagate(errp, local_err);
return NULL;
}
info = g_new0(GuestMemoryBlockInfo, 1);
info->size = strtol(buf, NULL, 16); /* the unit is bytes */
g_free(buf);
return info;
}
#else /* defined(__linux__) */
void qmp_guest_suspend_disk(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
}
void qmp_guest_suspend_ram(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
}
void qmp_guest_suspend_hybrid(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
}
GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return -1;
}
void qmp_guest_set_user_password(const char *username,
const char *password,
bool crypted,
Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
}
GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
GuestMemoryBlockResponseList *
qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
#endif
#if !defined(CONFIG_FSFREEZE)
GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return 0;
}
int64_t qmp_guest_fsfreeze_freeze(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return 0;
}
int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
strList *mountpoints,
Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return 0;
}
int64_t qmp_guest_fsfreeze_thaw(Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return 0;
}
#endif /* CONFIG_FSFREEZE */
#if !defined(CONFIG_FSTRIM)
GuestFilesystemTrimResponse *
qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
{
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
#endif
/* add unsupported commands to the blacklist */
GList *ga_command_blacklist_init(GList *blacklist)
{
#if !defined(__linux__)
{
const char *list[] = {
"guest-suspend-disk", "guest-suspend-ram",
"guest-suspend-hybrid", "guest-network-get-interfaces",
"guest-get-vcpus", "guest-set-vcpus",
"guest-get-memory-blocks", "guest-set-memory-blocks",
"guest-get-memory-block-size", NULL};
char **p = (char **)list;
while (*p) {
blacklist = g_list_append(blacklist, g_strdup(*p++));
}
}
#endif
#if !defined(CONFIG_FSFREEZE)
{
const char *list[] = {
"guest-get-fsinfo", "guest-fsfreeze-status",
"guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
"guest-fsfreeze-thaw", "guest-get-fsinfo", NULL};
char **p = (char **)list;
while (*p) {
blacklist = g_list_append(blacklist, g_strdup(*p++));
}
}
#endif
#if !defined(CONFIG_FSTRIM)
blacklist = g_list_append(blacklist, g_strdup("guest-fstrim"));
#endif
return blacklist;
}
/* register init/cleanup routines for stateful command groups */
void ga_command_state_init(GAState *s, GACommandState *cs)
{
#if defined(CONFIG_FSFREEZE)
ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
#endif
}