#include <string.h>
#include <fcntl.h>
#include <time.h>
+#include <sys/stat.h>
#include <sys/select.h>
+
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "guestfs.h"
#include "guestfs_protocol.h"
-void guestfs_error (guestfs_h *g, const char *fs, ...);
-void guestfs_perrorf (guestfs_h *g, const char *fs, ...);
-void *guestfs_safe_malloc (guestfs_h *g, size_t nbytes);
-void *guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes);
-char *guestfs_safe_strdup (guestfs_h *g, const char *str);
-void *guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size);
+#ifdef HAVE_GETTEXT
+#include "gettext.h"
+#define _(str) dgettext(PACKAGE, (str))
+#define N_(str) dgettext(PACKAGE, (str))
+#else
+#define _(str) str
+#define N_(str) str
+#endif
#define error guestfs_error
#define perrorf guestfs_perrorf
int fd[2]; /* Stdin/stdout of qemu. */
int sock; /* Daemon communications socket. */
- int pid; /* Qemu PID. */
+ pid_t pid; /* Qemu PID. */
+ pid_t recoverypid; /* Recovery process PID. */
time_t start_t; /* The time when we started qemu. */
int stdout_watch; /* Watches qemu stdout for log messages. */
int verbose;
int autosync;
- const char *path;
+ char *path; /* Path to kernel, initrd. */
+ char *qemu; /* Qemu binary. */
+ char *append; /* Append to kernel command line. */
char *last_error;
g->verbose = str != NULL && strcmp (str, "1") == 0;
str = getenv ("LIBGUESTFS_PATH");
- g->path = str != NULL ? str : GUESTFS_DEFAULT_PATH;
- /* XXX We should probably make QEMU configurable as well. */
+ g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
+ if (!g->path) goto error;
+
+ str = getenv ("LIBGUESTFS_QEMU");
+ g->qemu = str != NULL ? strdup (str) : strdup (QEMU);
+ if (!g->qemu) goto error;
+
+ str = getenv ("LIBGUESTFS_APPEND");
+ if (str) {
+ g->append = strdup (str);
+ if (!g->append) goto error;
+ }
g->main_loop = guestfs_get_default_main_loop ();
fprintf (stderr, "new guestfs handle %p\n", g);
return g;
+
+ error:
+ free (g->path);
+ free (g->qemu);
+ free (g->append);
+ free (g);
+ return NULL;
}
void
if (g->state == NO_HANDLE) {
/* Not safe to call 'error' here, so ... */
- fprintf (stderr, "guestfs_close: called twice on the same handle\n");
+ fprintf (stderr, _("guestfs_close: called twice on the same handle\n"));
return;
}
fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
/* Try to sync if autosync flag is set. */
- if (g->autosync && g->state == READY)
+ if (g->autosync && g->state == READY) {
+ guestfs_umount_all (g);
guestfs_sync (g);
+ }
/* Remove any handlers that might be called back before we kill the
* subprocess.
}
/* release mutex (XXX) */
+ free (g->msg_in);
+ free (g->msg_out);
free (g->last_error);
+ free (g->path);
+ free (g->qemu);
+ free (g->append);
free (g);
}
static void
default_error_cb (guestfs_h *g, void *data, const char *msg)
{
- fprintf (stderr, "libguestfs: error: %s\n", msg);
+ fprintf (stderr, _("libguestfs: error: %s\n"), msg);
}
void
guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
{
void *ptr = malloc (nbytes);
- if (!ptr) g->abort_cb ();
+ if (nbytes > 0 && !ptr) g->abort_cb ();
return ptr;
}
guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
{
void *p = realloc (ptr, nbytes);
- if (!p) g->abort_cb ();
+ if (nbytes > 0 && !p) g->abort_cb ();
return p;
}
return p;
}
+static int
+xwrite (int fd, const void *buf, size_t len)
+{
+ int r;
+
+ while (len > 0) {
+ r = write (fd, buf, len);
+ if (r == -1)
+ return -1;
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
+static int
+xread (int fd, void *buf, size_t len)
+{
+ int r;
+
+ while (len > 0) {
+ r = read (fd, buf, len);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ return -1;
+ }
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
void
guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
{
int
guestfs_set_path (guestfs_h *g, const char *path)
{
- if (path == NULL)
- g->path = GUESTFS_DEFAULT_PATH;
- else
- g->path = path;
+ free (g->path);
+ g->path = NULL;
+
+ g->path =
+ path == NULL ?
+ safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
return 0;
}
return g->path;
}
+int
+guestfs_set_qemu (guestfs_h *g, const char *qemu)
+{
+ free (g->qemu);
+ g->qemu = NULL;
+
+ g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
+ return 0;
+}
+
+const char *
+guestfs_get_qemu (guestfs_h *g)
+{
+ return g->qemu;
+}
+
+int
+guestfs_set_append (guestfs_h *g, const char *append)
+{
+ free (g->append);
+ g->append = NULL;
+
+ g->append = append ? safe_strdup (g, append) : NULL;
+ return 0;
+}
+
+const char *
+guestfs_get_append (guestfs_h *g)
+{
+ return g->append;
+}
+
/* Add a string to the current command line. */
static void
incr_cmdline_size (guestfs_h *g)
add_cmdline (guestfs_h *g, const char *str)
{
if (g->state != CONFIG) {
- error (g, "command line cannot be altered after qemu subprocess launched");
+ error (g,
+ _("command line cannot be altered after qemu subprocess launched"));
return -1;
}
const char *qemu_param, const char *qemu_value)
{
if (qemu_param[0] != '-') {
- error (g, "guestfs_config: parameter must begin with '-' character");
+ error (g, _("guestfs_config: parameter must begin with '-' character"));
return -1;
}
strcmp (qemu_param, "-full-screen") == 0 ||
strcmp (qemu_param, "-std-vga") == 0 ||
strcmp (qemu_param, "-vnc") == 0) {
- error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
+ error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
return -1;
}
int
guestfs_add_drive (guestfs_h *g, const char *filename)
{
- int len = strlen (filename) + 64;
+ size_t len = strlen (filename) + 64;
char buf[len];
if (strchr (filename, ',') != NULL) {
- error (g, "filename cannot contain ',' (comma) character");
+ error (g, _("filename cannot contain ',' (comma) character"));
return -1;
}
}
int
+guestfs_add_drive_ro (guestfs_h *g, const char *filename)
+{
+ size_t len = strlen (filename) + 64;
+ char buf[len];
+
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+
+ snprintf (buf, len, "file=%s,snapshot=on", filename);
+
+ return guestfs_config (g, "-drive", buf);
+}
+
+int
guestfs_add_cdrom (guestfs_h *g, const char *filename)
{
if (strchr (filename, ',') != NULL) {
- error (g, "filename cannot contain ',' (comma) character");
+ error (g, _("filename cannot contain ',' (comma) character"));
return -1;
}
guestfs_launch (guestfs_h *g)
{
static const char *dir_template = "/tmp/libguestfsXXXXXX";
- int r, i, len, pmore;
+ int r, i, pmore, memsize;
+ size_t len;
int wfd[2], rfd[2];
int tries;
const char *kernel_name = "vmlinuz." REPO "." host_cpu;
/* Configured? */
if (!g->cmdline) {
- error (g, "you must call guestfs_add_drive before guestfs_launch");
+ error (g, _("you must call guestfs_add_drive before guestfs_launch"));
return -1;
}
if (g->state != CONFIG) {
- error (g, "qemu has already been launched");
+ error (g, _("qemu has already been launched"));
return -1;
}
free (path);
if (kernel == NULL || initrd == NULL) {
- error (g, "cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)",
+ error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
kernel_name, initrd_name, g->path);
goto cleanup0;
}
+ /* Choose a suitable memory size. Previously we tried to choose
+ * a minimal memory size, but this isn't really necessary since
+ * recent QEMU and KVM don't do anything nasty like locking
+ * memory into core any more. This we can safely choose a
+ * large, generous amount of memory, and it'll just get swapped
+ * on smaller systems.
+ */
+ memsize = 384;
+
/* Make the temporary directory containing the socket. */
if (!g->tmpdir) {
g->tmpdir = safe_strdup (g, dir_template);
if (mkdtemp (g->tmpdir) == NULL) {
- perrorf (g, "%s: cannot create temporary directory", dir_template);
+ perrorf (g, _("%s: cannot create temporary directory"), dir_template);
goto cleanup0;
}
}
if (r == 0) { /* Child (qemu). */
char vmchannel[256];
char append[256];
+ char memsize_str[256];
/* Set up the full command line. Do this in the subprocess so we
* don't need to worry about cleaning up.
*/
- g->cmdline[0] = (char *) QEMU;
+ g->cmdline[0] = g->qemu;
/* Construct the -net channel parameter for qemu. */
snprintf (vmchannel, sizeof vmchannel,
/* Linux kernel command line. */
snprintf (append, sizeof append,
- "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
+ "panic=1 console=ttyS0 guestfs=%s:%d%s%s%s",
+ VMCHANNEL_ADDR, VMCHANNEL_PORT,
+ g->verbose ? " guestfs_verbose=1" : "",
+ g->append ? " " : "", g->append ? g->append : "");
+
+ snprintf (memsize_str, sizeof memsize_str, "%d", memsize);
add_cmdline (g, "-m");
- add_cmdline (g, "384"); /* XXX Choose best size. */
+ add_cmdline (g, memsize_str);
+#if 0
add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
+#endif
+ add_cmdline (g, "-no-reboot"); /* Force exit instead of reboot on panic */
add_cmdline (g, "-kernel");
add_cmdline (g, (char *) kernel);
add_cmdline (g, "-initrd");
add_cmdline (g, "-net");
add_cmdline (g, "user,vlan=0");
add_cmdline (g, "-net");
- add_cmdline (g, "nic,vlan=0");
+ add_cmdline (g, "nic,model=virtio,vlan=0");
incr_cmdline_size (g);
g->cmdline[g->cmdline_size-1] = NULL;
if (g->verbose) {
- fprintf (stderr, "%s", QEMU);
+ fprintf (stderr, "%s", g->qemu);
for (i = 0; g->cmdline[i]; ++i)
fprintf (stderr, " %s", g->cmdline[i]);
fprintf (stderr, "\n");
setpgid (0, 0);
#endif
- execv (QEMU, g->cmdline); /* Run qemu. */
- perror (QEMU);
+ execv (g->qemu, g->cmdline); /* Run qemu. */
+ perror (g->qemu);
_exit (1);
}
/* Parent (library). */
g->pid = r;
+ free (kernel);
+ kernel = NULL;
+ free (initrd);
+ initrd = NULL;
+
+ /* Fork the recovery process off which will kill qemu if the parent
+ * process fails to do so (eg. if the parent segfaults).
+ */
+ r = fork ();
+ if (r == 0) {
+ pid_t qemu_pid = g->pid;
+ pid_t parent_pid = getppid ();
+
+ /* Writing to argv is hideously complicated and error prone. See:
+ * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
+ */
+
+ /* Loop around waiting for one or both of the other processes to
+ * disappear. It's fair to say this is very hairy. The PIDs that
+ * we are looking at might be reused by another process. We are
+ * effectively polling. Is the cure worse than the disease?
+ */
+ for (;;) {
+ if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
+ _exit (0);
+ if (kill (parent_pid, 0) == -1) {
+ /* Parent's gone away, qemu still around, so kill qemu. */
+ kill (qemu_pid, 9);
+ _exit (0);
+ }
+ sleep (2);
+ }
+ }
+
+ /* Don't worry, if the fork failed, this will be -1. The recovery
+ * process isn't essential.
+ */
+ g->recoverypid = r;
+
/* Start the clock ... */
time (&g->start_t);
addr.sun_path[UNIX_PATH_MAX-1] = '\0';
tries = 100;
+ /* Always sleep at least once to give qemu a small chance to start up. */
+ usleep (10000);
while (tries > 0) {
- /* Always sleep at least once to give qemu a small chance to start up. */
- usleep (10000);
-
r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
if ((r == -1 && errno == EINPROGRESS) || r == 0)
goto connected;
if (errno != ENOENT)
perrorf (g, "connect");
tries--;
+ usleep (100000);
}
- error (g, "failed to connect to vmchannel socket");
+ error (g, _("failed to connect to vmchannel socket"));
goto cleanup2;
connected:
GUESTFS_HANDLE_READABLE,
stdout_event, NULL);
if (g->stdout_watch == -1) {
- error (g, "could not watch qemu stdout");
+ error (g, _("could not watch qemu stdout"));
goto cleanup3;
}
- g->sock_watch =
- g->main_loop->add_handle (g->main_loop, g, g->sock,
- GUESTFS_HANDLE_READABLE,
- sock_read_event, NULL);
- if (g->sock_watch == -1) {
- error (g, "could not watch daemon communications socket");
+ if (guestfs__switch_to_receiving (g) == -1)
goto cleanup3;
- }
g->state = LAUNCHING;
return 0;
close (wfd[1]);
close (rfd[0]);
kill (g->pid, 9);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
g->fd[0] = -1;
g->fd[1] = -1;
g->sock = -1;
g->pid = 0;
+ g->recoverypid = 0;
g->start_t = 0;
g->stdout_watch = -1;
g->sock_watch = -1;
if (g->state == READY) return 0;
if (g->state == BUSY) {
- error (g, "qemu has finished launching already");
+ error (g, _("qemu has finished launching already"));
return -1;
}
if (g->state != LAUNCHING) {
- error (g, "qemu has not been launched yet");
+ error (g, _("qemu has not been launched yet"));
return -1;
}
if (r == -1) return -1;
if (finished != 1) {
- error (g, "guestfs_wait_ready failed, see earlier error messages");
+ error (g, _("guestfs_wait_ready failed, see earlier error messages"));
return -1;
}
* commands after this function returns.
*/
if (g->state != READY) {
- error (g, "qemu launched and contacted daemon, but state != READY");
+ error (g, _("qemu launched and contacted daemon, but state != READY"));
return -1;
}
guestfs_kill_subprocess (guestfs_h *g)
{
if (g->state == CONFIG) {
- error (g, "no subprocess to kill");
+ error (g, _("no subprocess to kill"));
return -1;
}
fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
kill (g->pid, SIGTERM);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
return 0;
}
return g->state;
}
+int
+guestfs_set_ready (guestfs_h *g)
+{
+ if (g->state != BUSY) {
+ error (g, _("guestfs_set_ready: called when in state %d != BUSY"),
+ g->state);
+ return -1;
+ }
+ g->state = READY;
+ return 0;
+}
+
+int
+guestfs_set_busy (guestfs_h *g)
+{
+ if (g->state != READY) {
+ error (g, _("guestfs_set_busy: called when in state %d != READY"),
+ g->state);
+ return -1;
+ }
+ g->state = BUSY;
+ return 0;
+}
+
+int
+guestfs_end_busy (guestfs_h *g)
+{
+ switch (g->state)
+ {
+ case BUSY:
+ g->state = READY;
+ break;
+ case CONFIG:
+ case READY:
+ break;
+ case LAUNCHING:
+ case NO_HANDLE:
+ error (g, _("guestfs_end_busy: called when in state %d"), g->state);
+ return -1;
+ }
+ return 0;
+}
+
/* Structure-freeing functions. These rely on the fact that the
* structure format is identical to the XDR format. See note in
* generator.ml.
free (x);
}
+/* We don't know if stdout_event or sock_read_event will be the
+ * first to receive EOF if the qemu process dies. This function
+ * has the common cleanup code for both.
+ */
+static void
+child_cleanup (guestfs_h *g)
+{
+ if (g->verbose)
+ fprintf (stderr, "stdout_event: %p: child process died\n", g);
+ /*kill (g->pid, SIGTERM);*/
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+ if (g->stdout_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
+ if (g->sock_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
+ close (g->fd[0]);
+ close (g->fd[1]);
+ close (g->sock);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+ g->pid = 0;
+ g->recoverypid = 0;
+ g->start_t = 0;
+ g->stdout_watch = -1;
+ g->sock_watch = -1;
+ g->state = CONFIG;
+ if (g->subprocess_quit_cb)
+ g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
+}
+
/* This function is called whenever qemu prints something on stdout.
* Qemu's stdout is also connected to the guest's serial console, so
* we see kernel messages here too.
#endif
if (g->fd[1] != fd) {
- error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
+ error (g, _("stdout_event: internal error: %d != %d"), g->fd[1], fd);
return;
}
n = read (fd, buf, sizeof buf);
if (n == 0) {
/* Hopefully this indicates the qemu child process has died. */
- if (g->verbose)
- fprintf (stderr, "stdout_event: %p: child process died\n", g);
- /*kill (g->pid, SIGTERM);*/
- waitpid (g->pid, NULL, 0);
- if (g->stdout_watch >= 0)
- g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
- if (g->sock_watch >= 0)
- g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
- close (g->fd[0]);
- close (g->fd[1]);
- close (g->sock);
- g->fd[0] = -1;
- g->fd[1] = -1;
- g->sock = -1;
- g->pid = 0;
- g->start_t = 0;
- g->stdout_watch = -1;
- g->sock_watch = -1;
- g->state = CONFIG;
- if (g->subprocess_quit_cb)
- g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
+ child_cleanup (g);
return;
}
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
int watch, int fd, int events)
{
XDR xdr;
- unsigned len;
+ u_int32_t len;
int n;
if (g->verbose)
g, g->state, fd, events);
if (g->sock != fd) {
- error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
+ error (g, _("sock_read_event: internal error: %d != %d"), g->sock, fd);
return;
}
}
n = read (g->sock, g->msg_in + g->msg_in_size,
g->msg_in_allocated - g->msg_in_size);
- if (n == 0)
- /* Disconnected? Ignore it because stdout_watch will get called
- * and will do the cleanup.
- */
+ if (n == 0) {
+ /* Disconnected. */
+ child_cleanup (g);
return;
+ }
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
g->msg_in_size += n;
/* Have we got enough of a message to be able to process it yet? */
+ again:
if (g->msg_in_size < 4) return;
xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
if (!xdr_uint32_t (&xdr, &len)) {
- error (g, "can't decode length word");
+ error (g, _("can't decode length word"));
goto cleanup;
}
* starts up it sends a "magic" value (longer than any possible
* message). Check for this.
*/
- if (len == 0xf5f55ff5) {
+ if (len == GUESTFS_LAUNCH_FLAG) {
if (g->state != LAUNCHING)
- error (g, "received magic signature from guestfsd, but in state %d",
+ error (g, _("received magic signature from guestfsd, but in state %d"),
g->state);
else if (g->msg_in_size != 4)
- error (g, "received magic signature from guestfsd, but msg size is %d",
+ error (g, _("received magic signature from guestfsd, but msg size is %d"),
g->msg_in_size);
else {
g->state = READY;
goto cleanup;
}
- /* If this happens, it's pretty bad and we've probably lost synchronization.*/
+ /* This can happen if a cancellation happens right at the end
+ * of us sending a FileIn parameter to the daemon. Discard. The
+ * daemon should send us an error message next.
+ */
+ if (len == GUESTFS_CANCEL_FLAG) {
+ g->msg_in_size -= 4;
+ memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
+ goto again;
+ }
+
+ /* If this happens, it's pretty bad and we've probably lost
+ * synchronization.
+ */
if (len > GUESTFS_MESSAGE_MAX) {
- error (g, "message length (%u) > maximum possible size (%d)",
+ error (g, _("message length (%u) > maximum possible size (%d)"),
len, GUESTFS_MESSAGE_MAX);
goto cleanup;
}
if (g->msg_in_size-4 < len) return; /* Need more of this message. */
- /* This should not happen, and if it does it probably means we've
- * lost all hope of synchronization.
- */
- if (g->msg_in_size-4 > len) {
- error (g, "len = %d, but msg_in_size-4 = %d", len, g->msg_in_size-4);
- goto cleanup;
- }
-
/* Got the full message, begin processing it. */
+#if 0
if (g->verbose) {
int i, j;
printf ("|\n");
}
}
+#endif
/* Not in the expected state. */
if (g->state != BUSY)
- error (g, "state %d != BUSY", g->state);
+ error (g, _("state %d != BUSY"), g->state);
/* Push the message up to the higher layer. */
- g->state = READY;
if (g->reply_cb)
g->reply_cb (g, g->reply_cb_data, &xdr);
+ else
+ /* This message (probably) should never be printed. */
+ fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
+
+ g->msg_in_size -= len + 4;
+ memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
+ if (g->msg_in_size > 0) goto again;
cleanup:
/* Free the message buffer if it's grown excessively large. */
g, g->state, fd, events);
if (g->sock != fd) {
- error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
+ error (g, _("sock_write_event: internal error: %d != %d"), g->sock, fd);
return;
}
if (g->state != BUSY) {
- error (g, "sock_write_event: state %d != BUSY", g->state);
+ error (g, _("sock_write_event: state %d != BUSY"), g->state);
return;
}
return;
if (g->verbose)
- fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n");
+ fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
free (g->msg_out);
+ g->msg_out = NULL;
g->msg_out_pos = g->msg_out_size = 0;
- if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, "remove_handle failed in sock_write_event");
- return;
- }
- g->sock_watch =
- g->main_loop->add_handle (g->main_loop, g, g->sock,
- GUESTFS_HANDLE_READABLE,
- sock_read_event, NULL);
- if (g->sock_watch == -1) {
- error (g, "add_handle failed in sock_write_event");
- return;
- }
+ /* Done writing, call the higher layer. */
+ if (g->send_cb)
+ g->send_cb (g, g->send_cb_data);
}
void
return (guestfs_main_loop *) &default_main_loop;
}
-/* Dispatch a call (len + header + args) to the remote daemon. This
- * function just queues the call in msg_out, to be sent when we next
- * enter the main loop. Returns -1 for error, or the message serial
- * number.
+/* Change the daemon socket handler so that we are now writing.
+ * This sets the handle to sock_write_event.
+ */
+int
+guestfs__switch_to_sending (guestfs_h *g)
+{
+ if (g->sock_watch >= 0) {
+ if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+ error (g, _("remove_handle failed"));
+ g->sock_watch = -1;
+ return -1;
+ }
+ }
+
+ g->sock_watch =
+ g->main_loop->add_handle (g->main_loop, g, g->sock,
+ GUESTFS_HANDLE_WRITABLE,
+ sock_write_event, NULL);
+ if (g->sock_watch == -1) {
+ error (g, _("add_handle failed"));
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+guestfs__switch_to_receiving (guestfs_h *g)
+{
+ if (g->sock_watch >= 0) {
+ if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+ error (g, _("remove_handle failed"));
+ g->sock_watch = -1;
+ return -1;
+ }
+ }
+
+ g->sock_watch =
+ g->main_loop->add_handle (g->main_loop, g, g->sock,
+ GUESTFS_HANDLE_READABLE,
+ sock_read_event, NULL);
+ if (g->sock_watch == -1) {
+ error (g, _("add_handle failed"));
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Dispatch a call (len + header + args) to the remote daemon,
+ * synchronously (ie. using the guest's main loop to wait until
+ * it has been sent). Returns -1 for error, or the serial
+ * number of the message.
*/
+static void
+send_cb (guestfs_h *g, void *data)
+{
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+ *((int *)data) = 1;
+ ml->main_loop_quit (ml, g);
+}
+
int
-guestfs__send (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
+guestfs__send_sync (guestfs_h *g, int proc_nr,
+ xdrproc_t xdrp, char *args)
{
- char buffer[GUESTFS_MESSAGE_MAX];
struct guestfs_message_header hdr;
XDR xdr;
- unsigned len;
+ u_int32_t len;
int serial = g->msg_next_serial++;
+ int sent;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
- if (g->state != READY) {
- error (g, "dispatch: state %d != READY", g->state);
+ if (g->state != BUSY) {
+ error (g, _("guestfs__send_sync: state %d != BUSY"), g->state);
return -1;
}
+ /* This is probably an internal error. Or perhaps we should just
+ * free the buffer anyway?
+ */
+ if (g->msg_out != NULL) {
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ return -1;
+ }
+
+ /* We have to allocate this message buffer on the heap because
+ * it is quite large (although will be mostly unused). We
+ * can't allocate it on the stack because in some environments
+ * we have quite limited stack space available, notably when
+ * running in the JVM.
+ */
+ g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
+ xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
+
/* Serialize the header. */
hdr.prog = GUESTFS_PROGRAM;
hdr.vers = GUESTFS_PROTOCOL_VERSION;
hdr.serial = serial;
hdr.status = GUESTFS_STATUS_OK;
- xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
- error (g, "xdr_guestfs_message_header failed");
- return -1;
+ error (g, _("xdr_guestfs_message_header failed"));
+ goto cleanup1;
}
/* Serialize the args. If any, because some message types
*/
if (xdrp) {
if (!(*xdrp) (&xdr, args)) {
- error (g, "dispatch failed to marshal args");
- return -1;
+ error (g, _("dispatch failed to marshal args"));
+ goto cleanup1;
}
}
+ /* Get the actual length of the message, resize the buffer to match
+ * the actual length, and write the length word at the beginning.
+ */
len = xdr_getpos (&xdr);
xdr_destroy (&xdr);
- /* Allocate the outgoing message buffer. */
- g->msg_out = safe_malloc (g, len + 4);
-
+ g->msg_out = safe_realloc (g, g->msg_out, len + 4);
g->msg_out_size = len + 4;
g->msg_out_pos = 0;
- g->state = BUSY;
xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
- if (!xdr_uint32_t (&xdr, &len)) {
- error (g, "xdr_uint32_t failed in dispatch");
- goto cleanup1;
- }
+ xdr_uint32_t (&xdr, &len);
- memcpy (g->msg_out + 4, buffer, len);
+ if (guestfs__switch_to_sending (g) == -1)
+ goto cleanup1;
- /* Change the handle to sock_write_event. */
- if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, "remove_handle failed in dispatch");
+ sent = 0;
+ guestfs_set_send_callback (g, send_cb, &sent);
+ if (ml->main_loop_run (ml, g) == -1)
goto cleanup1;
- }
- g->sock_watch =
- g->main_loop->add_handle (g->main_loop, g, g->sock,
- GUESTFS_HANDLE_WRITABLE,
- sock_write_event, NULL);
- if (g->sock_watch == -1) {
- error (g, "add_handle failed in dispatch");
+ if (sent != 1) {
+ error (g, _("send failed, see earlier error messages"));
goto cleanup1;
}
free (g->msg_out);
g->msg_out = NULL;
g->msg_out_size = 0;
- g->state = READY;
return -1;
}
-#if 0
static int cancel = 0; /* XXX Implement file cancellation. */
-
-static int
-send_file (guestfs_h *g, const char *filename)
+static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
+static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
+static int send_file_cancellation_sync (guestfs_h *g);
+static int send_file_complete_sync (guestfs_h *g);
+
+/* Synchronously send a file.
+ * Returns:
+ * 0 OK
+ * -1 error
+ * -2 daemon cancelled (we must read the error message)
+ */
+int
+guestfs__send_file_sync (guestfs_h *g, const char *filename)
{
char buf[GUESTFS_MAX_CHUNK_SIZE];
- int fd, r;
+ int fd, r, err;
fd = open (filename, O_RDONLY);
if (fd == -1) {
perrorf (g, "open: %s", filename);
- send_file_cancellation (g);
+ send_file_cancellation_sync (g);
/* Daemon sees cancellation and won't reply, so caller can
* just return here.
*/
}
/* Send file in chunked encoding. */
- while (!cancel && (r = read (fd, buf, sizeof buf)) > 0) {
- if (send_file_data (g, buf, r) == -1)
- return -1;
+ while (!cancel) {
+ r = read (fd, buf, sizeof buf);
+ if (r == -1 && (errno == EINTR || errno == EAGAIN))
+ continue;
+ if (r <= 0) break;
+ err = send_file_data_sync (g, buf, r);
+ if (err < 0) {
+ if (err == -2) /* daemon sent cancellation */
+ send_file_cancellation_sync (g);
+ return err;
+ }
}
- if (cancel) {
- send_file_cancellation (g);
+ if (cancel) { /* cancel from either end */
+ send_file_cancellation_sync (g);
return -1;
}
if (r == -1) {
perrorf (g, "read: %s", filename);
- send_file_cancellation (g);
+ send_file_cancellation_sync (g);
return -1;
}
*/
if (close (fd) == -1) {
perrorf (g, "close: %s", filename);
- send_file_cancellation (g);
+ send_file_cancellation_sync (g);
return -1;
}
- return send_file_complete (g);
+ return send_file_complete_sync (g);
}
-/* Send a chunk, cancellation or end of file, wait for it to go. */
+/* Send a chunk of file data. */
static int
-send_file_chunk (guestfs_h *g, int cancel, const char *buf, size_t len)
+send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
{
- void *data;
+ return send_file_chunk_sync (g, 0, buf, len);
+}
+
+/* Send a cancellation message. */
+static int
+send_file_cancellation_sync (guestfs_h *g)
+{
+ return send_file_chunk_sync (g, 1, NULL, 0);
+}
+
+/* Send a file complete chunk. */
+static int
+send_file_complete_sync (guestfs_h *g)
+{
+ char buf[1];
+ return send_file_chunk_sync (g, 0, buf, 0);
+}
+
+/* Send a chunk, cancellation or end of file, synchronously (ie. wait
+ * for it to go).
+ */
+static int check_for_daemon_cancellation (guestfs_h *g);
+
+static int
+send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
+{
+ u_int32_t len;
+ int sent;
guestfs_chunk chunk;
XDR xdr;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
if (g->state != BUSY) {
- error (g, "send_file_chunk: state %d != READY", g->state);
+ error (g, _("send_file_chunk_sync: state %d != READY"), g->state);
return -1;
}
+ /* This is probably an internal error. Or perhaps we should just
+ * free the buffer anyway?
+ */
+ if (g->msg_out != NULL) {
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ return -1;
+ }
+
+ /* Did the daemon send a cancellation message? */
+ if (check_for_daemon_cancellation (g)) {
+ if (g->verbose)
+ fprintf (stderr, "got daemon cancellation\n");
+ return -2;
+ }
+
+ /* Allocate the chunk buffer. Don't use the stack to avoid
+ * excessive stack usage and unnecessary copies.
+ */
+ g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
+ xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
+
/* Serialize the chunk. */
chunk.cancel = cancel;
- chunk.data.data_len = len;
+ chunk.data.data_len = buflen;
chunk.data.data_val = (char *) buf;
- data = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 48);
- xdrmem_create (&xdr, data, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
- if (xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, "xdr_guestfs_chunk failed");
- free (data);
- return -1;
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
+ buf, buflen);
+ xdr_destroy (&xdr);
+ goto cleanup1;
}
- chunkdatalen = xdr_getpos (&xdr);
- xdr_destroy (&xdr);
-
len = xdr_getpos (&xdr);
xdr_destroy (&xdr);
- data = safe_realloc (g, data, len);
- g->msg_out = data;
- g->msg_out_size = len;
+ /* Reduce the size of the outgoing message buffer to the real length. */
+ g->msg_out = safe_realloc (g, g->msg_out, len + 4);
+ g->msg_out_size = len + 4;
g->msg_out_pos = 0;
- /* Change the handle to sock_write_event. */
- if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, "remove_handle failed in dispatch");
+ xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+
+ if (guestfs__switch_to_sending (g) == -1)
goto cleanup1;
- }
- g->sock_watch =
- g->main_loop->add_handle (g->main_loop, g, g->sock,
- GUESTFS_HANDLE_WRITABLE,
- sock_write_event, NULL);
- if (g->sock_watch == -1) {
- error (g, "add_handle failed in dispatch");
+
+ sent = 0;
+ guestfs_set_send_callback (g, send_cb, &sent);
+ if (ml->main_loop_run (ml, g) == -1)
+ goto cleanup1;
+ if (sent != 1) {
+ error (g, _("send file chunk failed, see earlier error messages"));
goto cleanup1;
}
free (g->msg_out);
g->msg_out = NULL;
g->msg_out_size = 0;
- g->state = READY;
return -1;
}
-/* Send a chunk of file data. */
+/* At this point we are sending FileIn file(s) to the guest, and not
+ * expecting to read anything, so if we do read anything, it must be
+ * a cancellation message. This checks for this case without blocking.
+ */
static int
-send_file_data (guestfs_h *g, const char *buf, size_t len)
+check_for_daemon_cancellation (guestfs_h *g)
{
- return send_file_chunk (g, 0, buf, len);
+ fd_set rset;
+ struct timeval tv;
+ int r;
+ char buf[4];
+ uint32_t flag;
+ XDR xdr;
+
+ FD_ZERO (&rset);
+ FD_SET (g->sock, &rset);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ r = select (g->sock+1, &rset, NULL, NULL, &tv);
+ if (r == -1) {
+ perrorf (g, "select");
+ return 0;
+ }
+ if (r == 0)
+ return 0;
+
+ /* Read the message from the daemon. */
+ r = xread (g->sock, buf, sizeof buf);
+ if (r == -1) {
+ perrorf (g, "read");
+ return 0;
+ }
+
+ xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (flag != GUESTFS_CANCEL_FLAG) {
+ error (g, _("check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n"),
+ flag, GUESTFS_CANCEL_FLAG);
+ return 0;
+ }
+
+ return 1;
}
-/* Send a cancellation message. */
-static int
-send_file_cancellation (guestfs_h *g)
+/* Synchronously receive a file. */
+
+/* Returns -1 = error, 0 = EOF, 1 = more data */
+static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
+
+int
+guestfs__receive_file_sync (guestfs_h *g, const char *filename)
{
- char buf[1];
- return send_file_chunk (g, 1, buf, 0);
+ void *buf;
+ int fd, r;
+ size_t len;
+
+ fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ goto cancel;
+ }
+
+ /* Receive the file in chunked encoding. */
+ while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
+ if (xwrite (fd, buf, len) == -1) {
+ perrorf (g, "%s: write", filename);
+ free (buf);
+ goto cancel;
+ }
+ free (buf);
+ if (r == 0) break; /* End of file. */
+ }
+
+ if (r == -1) {
+ error (g, _("%s: error in chunked encoding"), filename);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ return -1;
+ }
+
+ return 0;
+
+ cancel: ;
+ /* Send cancellation message to daemon, then wait until it
+ * cancels (just throwing away data).
+ */
+ XDR xdr;
+ char fbuf[4];
+ uint32_t flag = GUESTFS_CANCEL_FLAG;
+
+ xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
+ perrorf (g, _("write to daemon socket"));
+ return -1;
+ }
+
+ while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
+ ; /* just discard it */
+
+ return -1;
}
-/* Send a file complete chunk. */
+/* Note that the reply callback can be called multiple times before
+ * the main loop quits and we get back to the synchronous code. So
+ * we have to be prepared to save multiple chunks on a list here.
+ */
+struct receive_file_ctx {
+ int count; /* 0 if receive_file_cb not called, or
+ * else count number of chunks.
+ */
+ guestfs_chunk *chunks; /* Array of chunks. */
+};
+
+static void
+free_chunks (struct receive_file_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->count; ++i)
+ free (ctx->chunks[i].data.data_val);
+
+ free (ctx->chunks);
+}
+
+static void
+receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
+ guestfs_chunk chunk;
+
+ if (ctx->count == -1) /* Parse error occurred previously. */
+ return;
+
+ ml->main_loop_quit (ml, g);
+
+ memset (&chunk, 0, sizeof chunk);
+
+ if (!xdr_guestfs_chunk (xdr, &chunk)) {
+ error (g, _("failed to parse file chunk"));
+ free_chunks (ctx);
+ ctx->chunks = NULL;
+ ctx->count = -1;
+ return;
+ }
+
+ /* Copy the chunk to the list. */
+ ctx->chunks = safe_realloc (g, ctx->chunks,
+ sizeof (guestfs_chunk) * (ctx->count+1));
+ ctx->chunks[ctx->count] = chunk;
+ ctx->count++;
+}
+
+/* Receive a chunk of file data. */
+/* Returns -1 = error, 0 = EOF, 1 = more data */
static int
-send_file_complete (guestfs_h *g)
+receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
{
- char buf[0];
- return send_file_chunk (g, 0, buf, 0);
+ struct receive_file_ctx ctx;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ int i;
+ size_t len;
+
+ ctx.count = 0;
+ ctx.chunks = NULL;
+
+ guestfs_set_reply_callback (g, receive_file_cb, &ctx);
+ (void) ml->main_loop_run (ml, g);
+ guestfs_set_reply_callback (g, NULL, NULL);
+
+ if (ctx.count == 0) {
+ error (g, _("receive_file_data_sync: reply callback not called\n"));
+ return -1;
+ }
+
+ if (ctx.count == -1) {
+ error (g, _("receive_file_data_sync: parse error in reply callback\n"));
+ /* callback already freed the chunks */
+ return -1;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
+
+ /* Process each chunk in the list. */
+ if (buf) *buf = NULL; /* Accumulate data in this buffer. */
+ len = 0;
+
+ for (i = 0; i < ctx.count; ++i) {
+ if (ctx.chunks[i].cancel) {
+ error (g, _("file receive cancelled by daemon"));
+ free_chunks (&ctx);
+ if (buf) free (*buf);
+ if (len_r) *len_r = 0;
+ return -1;
+ }
+
+ if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
+ free_chunks (&ctx);
+ if (len_r) *len_r = len;
+ return 0;
+ }
+
+ if (buf) {
+ *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
+ memcpy (*buf+len, ctx.chunks[i].data.data_val,
+ ctx.chunks[i].data.data_len);
+ }
+ len += ctx.chunks[i].data.data_len;
+ }
+
+ if (len_r) *len_r = len;
+ free_chunks (&ctx);
+ return 1;
}
-#endif
/* This is the default main loop implementation, using select(2). */
struct select_main_loop *ml = (struct select_main_loop *) mlv;
if (fd < 0 || fd >= FD_SETSIZE) {
- error (g, "fd %d is out of range", fd);
+ error (g, _("fd %d is out of range"), fd);
return -1;
}
GUESTFS_HANDLE_WRITABLE |
GUESTFS_HANDLE_HANGUP |
GUESTFS_HANDLE_ERROR)) != 0) {
- error (g, "set of events (0x%x) contains unknown events", events);
+ error (g, _("set of events (0x%x) contains unknown events"), events);
return -1;
}
if (events == 0) {
- error (g, "set of events is empty");
+ error (g, _("set of events is empty"));
return -1;
}
if (FD_ISSET (fd, &ml->rset) ||
FD_ISSET (fd, &ml->wset) ||
FD_ISSET (fd, &ml->xset)) {
- error (g, "fd %d is already registered", fd);
+ error (g, _("fd %d is already registered"), fd);
return -1;
}
if (cb == NULL) {
- error (g, "callback is NULL");
+ error (g, _("callback is NULL"));
return -1;
}
struct select_main_loop *ml = (struct select_main_loop *) mlv;
if (fd < 0 || fd >= FD_SETSIZE) {
- error (g, "fd %d is out of range", fd);
+ error (g, _("fd %d is out of range"), fd);
return -1;
}
if (!FD_ISSET (fd, &ml->rset) &&
!FD_ISSET (fd, &ml->wset) &&
!FD_ISSET (fd, &ml->xset)) {
- error (g, "fd %d was not registered", fd);
+ error (g, _("fd %d was not registered"), fd);
return -1;
}
fd_set rset2, wset2, xset2;
if (ml->is_running) {
- error (g, "select_main_loop_run: this cannot be called recursively");
+ error (g, _("select_main_loop_run: this cannot be called recursively"));
return -1;
}
xset2 = ml->xset;
r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
perrorf (g, "select");
ml->is_running = 0;
return -1;
{
struct select_main_loop *ml = (struct select_main_loop *) mlv;
- if (!ml->is_running) {
- error (g, "cannot quit, we are not running in a main loop");
- return -1;
- }
+ /* Note that legitimately ml->is_running can be zero when
+ * this function is called.
+ */
ml->is_running = 0;
return 0;
git.annexia.org / libguestfs.git / blobdiff