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qemu/qga/commands-posix.c
Zhao Liu 1d523869d7 qga/commands-posix: Make ga_wait_child() return boolean 
Make ga_wait_child() return boolean and check the returned boolean
in ga_run_command() instead of dereferencing @errp.

Cc: Michael Roth <michael.roth@amd.com>
Cc: Konstantin Kostiuk <kkostiuk@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Message-ID: <20240716162351.270095-1-zhao1.liu@intel.com>
Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
2024-07-19 11:52:25 +03:00

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/*
* 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/utsname.h>
#include <sys/wait.h>
#include <dirent.h>
#include "qga-qapi-commands.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qemu/host-utils.h"
#include "qemu/sockets.h"
#include "qemu/base64.h"
#include "qemu/cutils.h"
#include "commands-common.h"
#include "cutils.h"
#ifdef HAVE_UTMPX
#include <utmpx.h>
#endif
#ifdef HAVE_GETIFADDRS
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>
#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(CONFIG_SOLARIS)
#include <net/if_arp.h>
#include <netinet/if_ether.h>
#if !defined(ETHER_ADDR_LEN) && defined(ETHERADDRL)
#define ETHER_ADDR_LEN ETHERADDRL
#endif
#else
#include <net/ethernet.h>
#endif
#ifdef CONFIG_SOLARIS
#include <sys/sockio.h>
#endif
#endif
static bool ga_wait_child(pid_t pid, int *status, Error **errp)
{
pid_t rpid;
*status = 0;
rpid = RETRY_ON_EINTR(waitpid(pid, status, 0));
if (rpid == -1) {
error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
pid);
return false;
}
g_assert(rpid == pid);
return true;
}
static ssize_t ga_pipe_read_str(int fd[2], char **str)
{
ssize_t n, len = 0;
char buf[1024];
close(fd[1]);
fd[1] = -1;
while ((n = read(fd[0], buf, sizeof(buf))) != 0) {
if (n < 0) {
if (errno == EINTR) {
continue;
} else {
len = -errno;
break;
}
}
*str = g_realloc(*str, len + n + 1);
memcpy(*str + len, buf, n);
len += n;
*str[len] = '\0';
}
close(fd[0]);
fd[0] = -1;
return len;
}
/*
* Helper to run command with input/output redirection,
* sending string to stdin and taking error message from
* stdout/err.
*/
static int ga_run_command(const char *argv[], const char *in_str,
const char *action, Error **errp)
{
pid_t pid;
int status;
int retcode = -1;
int infd[2] = { -1, -1 };
int outfd[2] = { -1, -1 };
char *str = NULL;
ssize_t len = 0;
if ((in_str && !g_unix_open_pipe(infd, FD_CLOEXEC, NULL)) ||
!g_unix_open_pipe(outfd, FD_CLOEXEC, NULL)) {
error_setg(errp, "cannot create pipe FDs");
goto out;
}
pid = fork();
if (pid == 0) {
char *cherr = NULL;
setsid();
if (in_str) {
/* Redirect stdin to infd. */
close(infd[1]);
dup2(infd[0], 0);
close(infd[0]);
} else {
reopen_fd_to_null(0);
}
/* Redirect stdout/stderr to outfd. */
close(outfd[0]);
dup2(outfd[1], 1);
dup2(outfd[1], 2);
close(outfd[1]);
execvp(argv[0], (char *const *)argv);
/* Write the cause of failed exec to pipe for the parent to read it. */
cherr = g_strdup_printf("failed to exec '%s'", argv[0]);
perror(cherr);
g_free(cherr);
_exit(EXIT_FAILURE);
} else if (pid < 0) {
error_setg_errno(errp, errno, "failed to create child process");
goto out;
}
if (in_str) {
close(infd[0]);
infd[0] = -1;
if (qemu_write_full(infd[1], in_str, strlen(in_str)) !=
strlen(in_str)) {
error_setg_errno(errp, errno, "%s: cannot write to stdin pipe",
action);
goto out;
}
close(infd[1]);
infd[1] = -1;
}
len = ga_pipe_read_str(outfd, &str);
if (len < 0) {
error_setg_errno(errp, -len, "%s: cannot read from stdout/stderr pipe",
action);
goto out;
}
if (!ga_wait_child(pid, &status, errp)) {
goto out;
}
if (!WIFEXITED(status)) {
if (len) {
error_setg(errp, "child process has terminated abnormally: %s",
str);
} else {
error_setg(errp, "child process has terminated abnormally");
}
goto out;
}
retcode = WEXITSTATUS(status);
if (WEXITSTATUS(status)) {
if (len) {
error_setg(errp, "child process has failed to %s: %s",
action, str);
} else {
error_setg(errp, "child process has failed to %s: exit status %d",
action, WEXITSTATUS(status));
}
goto out;
}
out:
g_free(str);
if (infd[0] != -1) {
close(infd[0]);
}
if (infd[1] != -1) {
close(infd[1]);
}
if (outfd[0] != -1) {
close(outfd[0]);
}
if (outfd[1] != -1) {
close(outfd[1]);
}
return retcode;
}
void qmp_guest_shutdown(const char *mode, Error **errp)
{
const char *shutdown_flag;
Error *local_err = NULL;
#ifdef CONFIG_SOLARIS
const char *powerdown_flag = "-i5";
const char *halt_flag = "-i0";
const char *reboot_flag = "-i6";
#elif defined(CONFIG_BSD)
const char *powerdown_flag = "-p";
const char *halt_flag = "-h";
const char *reboot_flag = "-r";
#else
const char *powerdown_flag = "-P";
const char *halt_flag = "-H";
const char *reboot_flag = "-r";
#endif
slog("guest-shutdown called, mode: %s", mode);
if (!mode || strcmp(mode, "powerdown") == 0) {
shutdown_flag = powerdown_flag;
} else if (strcmp(mode, "halt") == 0) {
shutdown_flag = halt_flag;
} else if (strcmp(mode, "reboot") == 0) {
shutdown_flag = reboot_flag;
} else {
error_setg(errp,
"mode is invalid (valid values are: halt|powerdown|reboot");
return;
}
const char *argv[] = {"/sbin/shutdown",
#ifdef CONFIG_SOLARIS
shutdown_flag, "-g0", "-y",
#elif defined(CONFIG_BSD)
shutdown_flag, "+0",
#else
"-h", shutdown_flag, "+0",
#endif
"hypervisor initiated shutdown", (char *) NULL};
ga_run_command(argv, NULL, "shutdown", &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
/* succeeded */
}
void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
{
int ret;
Error *local_err = NULL;
struct timeval tv;
const char *argv[] = {"/sbin/hwclock", has_time ? "-w" : "-s", NULL};
/* 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). */
ga_run_command(argv, NULL, "set hardware clock to system time",
&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
typedef enum {
RW_STATE_NEW,
RW_STATE_READING,
RW_STATE_WRITING,
} RwState;
struct GuestFileHandle {
uint64_t id;
FILE *fh;
RwState state;
QTAILQ_ENTRY(GuestFileHandle) next;
};
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;
}
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)
{
int oflag;
int fd = -1;
FILE *f = NULL;
oflag = find_open_flag(mode, errp);
if (oflag < 0) {
goto end;
}
/* 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 = qga_open_cloexec(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
if (fd == -1 && errno == EEXIST) {
oflag &= ~(unsigned)O_CREAT;
fd = qga_open_cloexec(path, oflag, 0);
}
if (fd == -1) {
error_setg_errno(errp, errno,
"failed to open file '%s' (mode: '%s')",
path, mode);
goto end;
}
if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
error_setg_errno(errp, errno, "failed to set permission "
"0%03o on new file '%s' (mode: '%s')",
(unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
goto end;
}
f = fdopen(fd, mode);
if (f == NULL) {
error_setg_errno(errp, errno, "failed to associate stdio stream with "
"file descriptor %d, file '%s' (mode: '%s')",
fd, path, mode);
}
end:
if (f == NULL && fd != -1) {
close(fd);
if (oflag & O_CREAT) {
unlink(path);
}
}
return f;
}
int64_t qmp_guest_file_open(const char *path, const char *mode,
Error **errp)
{
FILE *fh;
Error *local_err = NULL;
int64_t handle;
if (!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
*/
if (!g_unix_set_fd_nonblocking(fileno(fh), true, NULL)) {
fclose(fh);
error_setg_errno(errp, errno, "Failed to set FD nonblocking");
return -1;
}
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);
}
GuestFileRead *guest_file_read_unsafe(GuestFileHandle *gfh,
int64_t count, Error **errp)
{
GuestFileRead *read_data = NULL;
guchar *buf;
FILE *fh = gfh->fh;
size_t read_count;
/* 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");
} 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;
}
}
#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
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);
}
}
#endif
#if defined(CONFIG_FSFREEZE)
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)
{
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;
}
const char *argv[] = {hook, arg_str, NULL};
slog("executing fsfreeze hook with arg '%s'", arg_str);
ga_run_command(argv, NULL, "execute fsfreeze hook", &local_err);
if (local_err) {
error_propagate(errp, local_err);
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);
}
int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
strList *mountpoints,
Error **errp)
{
int ret;
FsMountList mounts;
Error *local_err = NULL;
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);
if (!build_fs_mount_list(&mounts, &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);
ret = qmp_guest_fsfreeze_do_freeze_list(has_mountpoints, mountpoints,
mounts, errp);
free_fs_mount_list(&mounts);
/* We may not issue any FIFREEZE here.
* Just unset ga_state here and ready for the next call.
*/
if (ret == 0) {
ga_unset_frozen(ga_state);
} else if (ret < 0) {
qmp_guest_fsfreeze_thaw(NULL);
}
return ret;
}
int64_t qmp_guest_fsfreeze_thaw(Error **errp)
{
int ret;
ret = qmp_guest_fsfreeze_do_thaw(errp);
if (ret >= 0) {
ga_unset_frozen(ga_state);
execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
} else {
ret = 0;
}
return ret;
}
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
#if defined(__linux__) || defined(__FreeBSD__)
void qmp_guest_set_user_password(const char *username,
const char *password,
bool crypted,
Error **errp)
{
Error *local_err = NULL;
g_autofree char *rawpasswddata = NULL;
size_t rawpasswdlen;
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");
return;
}
if (strchr(username, '\n') ||
strchr(username, ':')) {
error_setg(errp, "forbidden characters in username");
return;
}
#ifdef __FreeBSD__
g_autofree char *chpasswddata = g_strdup(rawpasswddata);
const char *crypt_flag = crypted ? "-H" : "-h";
const char *argv[] = {"pw", "usermod", "-n", username,
crypt_flag, "0", NULL};
#else
g_autofree char *chpasswddata = g_strdup_printf("%s:%s\n", username,
rawpasswddata);
const char *crypt_flag = crypted ? "-e" : NULL;
const char *argv[] = {"chpasswd", crypt_flag, NULL};
#endif
ga_run_command(argv, chpasswddata, "set user password", &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
#endif /* __linux__ || __FreeBSD__ */
#ifdef HAVE_GETIFADDRS
static GuestNetworkInterface *
guest_find_interface(GuestNetworkInterfaceList *head,
const char *name)
{
for (; head; head = head->next) {
if (strcmp(head->value->name, name) == 0) {
return head->value;
}
}
return NULL;
}
static int guest_get_network_stats(const char *name,
GuestNetworkInterfaceStat *stats)
{
#ifdef CONFIG_LINUX
int name_len;
char const *devinfo = "/proc/net/dev";
FILE *fp;
char *line = NULL, *colon;
size_t n = 0;
fp = fopen(devinfo, "r");
if (!fp) {
g_debug("failed to open network stats %s: %s", devinfo,
g_strerror(errno));
return -1;
}
name_len = strlen(name);
while (getline(&line, &n, fp) != -1) {
long long dummy;
long long rx_bytes;
long long rx_packets;
long long rx_errs;
long long rx_dropped;
long long tx_bytes;
long long tx_packets;
long long tx_errs;
long long tx_dropped;
char *trim_line;
trim_line = g_strchug(line);
if (trim_line[0] == '\0') {
continue;
}
colon = strchr(trim_line, ':');
if (!colon) {
continue;
}
if (colon - name_len == trim_line &&
strncmp(trim_line, name, name_len) == 0) {
if (sscanf(colon + 1,
"%lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
&rx_bytes, &rx_packets, &rx_errs, &rx_dropped,
&dummy, &dummy, &dummy, &dummy,
&tx_bytes, &tx_packets, &tx_errs, &tx_dropped,
&dummy, &dummy, &dummy, &dummy) != 16) {
continue;
}
stats->rx_bytes = rx_bytes;
stats->rx_packets = rx_packets;
stats->rx_errs = rx_errs;
stats->rx_dropped = rx_dropped;
stats->tx_bytes = tx_bytes;
stats->tx_packets = tx_packets;
stats->tx_errs = tx_errs;
stats->tx_dropped = tx_dropped;
fclose(fp);
g_free(line);
return 0;
}
}
fclose(fp);
g_free(line);
g_debug("/proc/net/dev: Interface '%s' not found", name);
#else /* !CONFIG_LINUX */
g_debug("Network stats reporting available only for Linux");
#endif /* !CONFIG_LINUX */
return -1;
}
#ifndef CONFIG_BSD
/*
* Fill "buf" with MAC address by ifaddrs. Pointer buf must point to a
* buffer with ETHER_ADDR_LEN length at least.
*
* Returns false in case of an error, otherwise true. "obtained" argument
* is true if a MAC address was obtained successful, otherwise false.
*/
bool guest_get_hw_addr(struct ifaddrs *ifa, unsigned char *buf,
bool *obtained, Error **errp)
{
struct ifreq ifr;
int sock;
*obtained = false;
/* 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");
return false;
}
memset(&ifr, 0, sizeof(ifr));
pstrcpy(ifr.ifr_name, IF_NAMESIZE, ifa->ifa_name);
if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
/*
* We can't get the hw addr of this interface, but that's not a
* fatal error.
*/
if (errno == EADDRNOTAVAIL) {
/* The interface doesn't have a hw addr (e.g. loopback). */
g_debug("failed to get MAC address of %s: %s",
ifa->ifa_name, strerror(errno));
} else{
g_warning("failed to get MAC address of %s: %s",
ifa->ifa_name, strerror(errno));
}
} else {
#ifdef CONFIG_SOLARIS
memcpy(buf, &ifr.ifr_addr.sa_data, ETHER_ADDR_LEN);
#else
memcpy(buf, &ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
#endif
*obtained = true;
}
close(sock);
return true;
}
#endif /* CONFIG_BSD */
/*
* Build information about guest interfaces
*/
GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
{
GuestNetworkInterfaceList *head = NULL, **tail = &head;
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) {
GuestNetworkInterface *info;
GuestIpAddressList **address_tail;
GuestIpAddress *address_item = NULL;
GuestNetworkInterfaceStat *interface_stat = NULL;
char addr4[INET_ADDRSTRLEN];
char addr6[INET6_ADDRSTRLEN];
unsigned char mac_addr[ETHER_ADDR_LEN];
bool obtained;
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->name = g_strdup(ifa->ifa_name);
QAPI_LIST_APPEND(tail, info);
}
if (!info->hardware_address) {
if (!guest_get_hw_addr(ifa, mac_addr, &obtained, errp)) {
goto error;
}
if (obtained) {
info->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]);
}
}
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->ip_address = g_strdup(addr4);
address_item->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->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->ip_address = g_strdup(addr6);
address_item->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->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_tail = &info->ip_addresses;
while (*address_tail) {
address_tail = &(*address_tail)->next;
}
QAPI_LIST_APPEND(address_tail, address_item);
info->has_ip_addresses = true;
if (!info->statistics) {
interface_stat = g_malloc0(sizeof(*interface_stat));
if (guest_get_network_stats(info->name, interface_stat) == -1) {
g_free(interface_stat);
} else {
info->statistics = interface_stat;
}
}
}
freeifaddrs(ifap);
return head;
error:
freeifaddrs(ifap);
qapi_free_GuestNetworkInterfaceList(head);
return NULL;
}
#endif /* HAVE_GETIFADDRS */
/* 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
}
#ifdef HAVE_UTMPX
#define QGA_MICRO_SECOND_TO_SECOND 1000000
static double ga_get_login_time(struct utmpx *user_info)
{
double seconds = (double)user_info->ut_tv.tv_sec;
double useconds = (double)user_info->ut_tv.tv_usec;
useconds /= QGA_MICRO_SECOND_TO_SECOND;
return seconds + useconds;
}
GuestUserList *qmp_guest_get_users(Error **errp)
{
GHashTable *cache = NULL;
GuestUserList *head = NULL, **tail = &head;
struct utmpx *user_info = NULL;
gpointer value = NULL;
GuestUser *user = NULL;
double login_time = 0;
cache = g_hash_table_new(g_str_hash, g_str_equal);
setutxent();
for (;;) {
user_info = getutxent();
if (user_info == NULL) {
break;
} else if (user_info->ut_type != USER_PROCESS) {
continue;
} else if (g_hash_table_contains(cache, user_info->ut_user)) {
value = g_hash_table_lookup(cache, user_info->ut_user);
user = (GuestUser *)value;
login_time = ga_get_login_time(user_info);
/* We're ensuring the earliest login time to be sent */
if (login_time < user->login_time) {
user->login_time = login_time;
}
continue;
}
user = g_new0(GuestUser, 1);
user->user = g_strdup(user_info->ut_user);
user->login_time = ga_get_login_time(user_info);
g_hash_table_insert(cache, user->user, user);
QAPI_LIST_APPEND(tail, user);
}
endutxent();
g_hash_table_destroy(cache);
return head;
}
#endif /* HAVE_UTMPX */
/* Replace escaped special characters with their real values. The replacement
* is done in place -- returned value is in the original string.
*/
static void ga_osrelease_replace_special(gchar *value)
{
gchar *p, *p2, quote;
/* Trim the string at first space or semicolon if it is not enclosed in
* single or double quotes. */
if ((value[0] != '"') || (value[0] == '\'')) {
p = strchr(value, ' ');
if (p != NULL) {
*p = 0;
}
p = strchr(value, ';');
if (p != NULL) {
*p = 0;
}
return;
}
quote = value[0];
p2 = value;
p = value + 1;
while (*p != 0) {
if (*p == '\\') {
p++;
switch (*p) {
case '$':
case '\'':
case '"':
case '\\':
case '`':
break;
default:
/* Keep literal backslash followed by whatever is there */
p--;
break;
}
} else if (*p == quote) {
*p2 = 0;
break;
}
*(p2++) = *(p++);
}
}
static GKeyFile *ga_parse_osrelease(const char *fname)
{
gchar *content = NULL;
gchar *content2 = NULL;
GError *err = NULL;
GKeyFile *keys = g_key_file_new();
const char *group = "[os-release]\n";
if (!g_file_get_contents(fname, &content, NULL, &err)) {
slog("failed to read '%s', error: %s", fname, err->message);
goto fail;
}
if (!g_utf8_validate(content, -1, NULL)) {
slog("file is not utf-8 encoded: %s", fname);
goto fail;
}
content2 = g_strdup_printf("%s%s", group, content);
if (!g_key_file_load_from_data(keys, content2, -1, G_KEY_FILE_NONE,
&err)) {
slog("failed to parse file '%s', error: %s", fname, err->message);
goto fail;
}
g_free(content);
g_free(content2);
return keys;
fail:
g_error_free(err);
g_free(content);
g_free(content2);
g_key_file_free(keys);
return NULL;
}
GuestOSInfo *qmp_guest_get_osinfo(Error **errp)
{
GuestOSInfo *info = NULL;
struct utsname kinfo;
GKeyFile *osrelease = NULL;
const char *qga_os_release = g_getenv("QGA_OS_RELEASE");
info = g_new0(GuestOSInfo, 1);
if (uname(&kinfo) != 0) {
error_setg_errno(errp, errno, "uname failed");
} else {
info->kernel_version = g_strdup(kinfo.version);
info->kernel_release = g_strdup(kinfo.release);
info->machine = g_strdup(kinfo.machine);
}
if (qga_os_release != NULL) {
osrelease = ga_parse_osrelease(qga_os_release);
} else {
osrelease = ga_parse_osrelease("/etc/os-release");
if (osrelease == NULL) {
osrelease = ga_parse_osrelease("/usr/lib/os-release");
}
}
if (osrelease != NULL) {
char *value;
#define GET_FIELD(field, osfield) do { \
value = g_key_file_get_value(osrelease, "os-release", osfield, NULL); \
if (value != NULL) { \
ga_osrelease_replace_special(value); \
info->field = value; \
} \
} while (0)
GET_FIELD(id, "ID");
GET_FIELD(name, "NAME");
GET_FIELD(pretty_name, "PRETTY_NAME");
GET_FIELD(version, "VERSION");
GET_FIELD(version_id, "VERSION_ID");
GET_FIELD(variant, "VARIANT");
GET_FIELD(variant_id, "VARIANT_ID");
#undef GET_FIELD
g_key_file_free(osrelease);
}
return info;
}
#ifndef HOST_NAME_MAX
# ifdef _POSIX_HOST_NAME_MAX
# define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
# else
# define HOST_NAME_MAX 255
# endif
#endif
char *qga_get_host_name(Error **errp)
{
long len = -1;
g_autofree char *hostname = NULL;
#ifdef _SC_HOST_NAME_MAX
len = sysconf(_SC_HOST_NAME_MAX);
#endif /* _SC_HOST_NAME_MAX */
if (len < 0) {
len = HOST_NAME_MAX;
}
/* Unfortunately, gethostname() below does not guarantee a
* NULL terminated string. Therefore, allocate one byte more
* to be sure. */
hostname = g_new0(char, len + 1);
if (gethostname(hostname, len) < 0) {
error_setg_errno(errp, errno,
"cannot get hostname");
return NULL;
}
return g_steal_pointer(&hostname);
}
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