/* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009-2011 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
+#include <signal.h>
+#include <inttypes.h>
#include <unistd.h>
#include <errno.h>
#include <sys/param.h> /* defines MIN */
#include <sys/select.h>
+#include <sys/time.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "ignore-value.h"
#include "daemon.h"
-#include "../src/guestfs_protocol.h"
+#include "guestfs_protocol.h"
+#include "errnostring.h"
/* The message currently being processed. */
int proc_nr;
int serial;
+/* Hint for implementing progress messages for uploaded/incoming data.
+ * The caller sets this to a value > 0 if it knows or can estimate how
+ * much data will be sent (this is not always known, eg. for uploads
+ * coming from a pipe). If this is known then we can emit progress
+ * messages as we write the data.
+ */
+uint64_t progress_hint;
+
+/* Optional arguments bitmask. Caller sets this to indicate which
+ * optional arguments in the guestfs_<foo>_args structure are
+ * meaningful. Optional arguments not covered by the bitmask are set
+ * to arbitrary values and the daemon should ignore them. If the
+ * bitmask has bits set that the daemon doesn't understand, then the
+ * whole call is rejected early in processing.
+ */
+uint64_t optargs_bitmask;
+
+/* Time at which we received the current request. */
+static struct timeval start_t;
+
+/* Time at which the last progress notification was sent. */
+static struct timeval last_progress_t;
+
+/* Counts the number of progress notifications sent during this call. */
+static int count_progress;
+
/* The daemon communications socket. */
static int sock;
char lenbuf[4];
uint32_t len;
struct guestfs_message_header hdr;
- struct timeval start_t, end_t;
- int64_t start_us, end_us, elapsed_us;
sock = _sock;
for (;;) {
- /* Most common errors are leaked memory and leaked file descriptors,
- * so run this between each command:
- */
- if (verbose && 0)
- ignore_value (system ("ls -l /proc/self/fd"));
-
/* Read the length word. */
if (xread (sock, lenbuf, 4) == -1)
exit (EXIT_FAILURE);
xdr_u_int (&xdr, &len);
xdr_destroy (&xdr);
+ if (verbose)
+ fprintf (stderr,
+ "guestfsd: main_loop: new request, len 0x%" PRIx32 "\n",
+ len);
+
if (len > GUESTFS_MESSAGE_MAX) {
fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n",
len);
}
#endif
- /* In verbose mode, display the time taken to run each command. */
- if (verbose)
- gettimeofday (&start_t, NULL);
+ gettimeofday (&start_t, NULL);
+ last_progress_t = start_t;
+ count_progress = 0;
/* Decode the message header. */
xdrmem_create (&xdr, buf, len, XDR_DECODE);
proc_nr = hdr.proc;
serial = hdr.serial;
+ progress_hint = hdr.progress_hint;
+ optargs_bitmask = hdr.optargs_bitmask;
/* Clear errors before we call the stub functions. This is just
* to ensure that we can accurately report errors in cases where
/* In verbose mode, display the time taken to run each command. */
if (verbose) {
+ struct timeval end_t;
gettimeofday (&end_t, NULL);
+ int64_t start_us, end_us, elapsed_us;
start_us = (int64_t) start_t.tv_sec * 1000000 + start_t.tv_usec;
end_us = (int64_t) end_t.tv_sec * 1000000 + end_t.tv_usec;
elapsed_us = end_us - start_us;
- fprintf (stderr, "proc %d (%s) took %d.%02d seconds\n",
+
+ fprintf (stderr,
+ "guestfsd: main_loop: proc %d (%s) took %d.%02d seconds\n",
proc_nr,
proc_nr >= 0 && proc_nr < GUESTFS_PROC_NR_PROCS
? function_names[proc_nr] : "UNKNOWN PROCEDURE",
exit (EXIT_FAILURE);
}
- err.linux_errno = errnum;
+ /* These strings are not going to be freed. We just cast them
+ * to (char *) because they are defined that way in the XDR structs.
+ */
+ err.errno_string =
+ (char *) (errnum > 0 ? guestfs___errno_to_string (errnum) : "");
err.error_message = (char *) msg;
if (!xdr_guestfs_message_error (&xdr, &err)) {
xdr_destroy (&xdr);
if (xwrite (sock, lenbuf, 4) == -1) {
- fprintf (stderr, "xwrite failed\n");
+ fprintf (stderr, "guestfsd: xwrite failed\n");
exit (EXIT_FAILURE);
}
if (xwrite (sock, buf, len) == -1) {
- fprintf (stderr, "xwrite failed\n");
+ fprintf (stderr, "guestfsd: xwrite failed\n");
exit (EXIT_FAILURE);
}
}
xdr_destroy (&xdr);
if (xwrite (sock, lenbuf, 4) == -1) {
- fprintf (stderr, "xwrite failed\n");
+ fprintf (stderr, "guestfsd: xwrite failed\n");
exit (EXIT_FAILURE);
}
if (xwrite (sock, buf, len) == -1) {
- fprintf (stderr, "xwrite failed\n");
+ fprintf (stderr, "guestfsd: xwrite failed\n");
exit (EXIT_FAILURE);
}
}
for (;;) {
if (verbose)
- fprintf (stderr, "receive_file: reading length word\n");
+ fprintf (stderr, "guestfsd: receive_file: reading length word\n");
/* Read the length word. */
if (xread (sock, lenbuf, 4) == -1)
free (buf);
if (verbose)
- fprintf (stderr, "receive_file: got chunk: cancel = %d, len = %d, buf = %p\n",
+ fprintf (stderr,
+ "guestfsd: receive_file: got chunk: cancel = 0x%x, len = %d, buf = %p\n",
chunk.cancel, chunk.data.data_len, chunk.data.data_val);
+ if (chunk.cancel != 0 && chunk.cancel != 1) {
+ fprintf (stderr,
+ "guestfsd: receive_file: chunk.cancel != [0|1] ... "
+ "continuing even though we have probably lost synchronization with the library\n");
+ return -1;
+ }
+
if (chunk.cancel) {
if (verbose)
- fprintf (stderr, "receive_file: received cancellation from library\n");
+ fprintf (stderr,
+ "guestfsd: receive_file: received cancellation from library\n");
xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
return -2;
}
if (chunk.data.data_len == 0) {
if (verbose)
- fprintf (stderr, "receive_file: end of file, leaving function\n");
+ fprintf (stderr,
+ "guestfsd: receive_file: end of file, leaving function\n");
xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
return 0; /* end of file */
}
+ /* Note that the callback can generate progress messages. */
if (cb)
r = cb (opaque, chunk.data.data_val, chunk.data.data_len);
else
xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
if (r == -1) { /* write error */
if (verbose)
- fprintf (stderr, "receive_file: write error\n");
+ fprintf (stderr, "guestfsd: receive_file: write error\n");
return -1;
}
}
int cancel;
if (len > GUESTFS_MAX_CHUNK_SIZE) {
- fprintf (stderr, "send_file_write: len (%d) > GUESTFS_MAX_CHUNK_SIZE (%d)\n",
+ fprintf (stderr, "guestfsd: send_file_write: len (%d) > GUESTFS_MAX_CHUNK_SIZE (%d)\n",
len, GUESTFS_MAX_CHUNK_SIZE);
return -1;
}
xdr_destroy (&xdr);
if (flag != GUESTFS_CANCEL_FLAG) {
- fprintf (stderr, "check_for_library_cancellation: read 0x%x from library, expected 0x%x\n",
+ fprintf (stderr, "guestfsd: check_for_library_cancellation: read 0x%x from library, expected 0x%x\n",
flag, GUESTFS_CANCEL_FLAG);
return 0;
}
xdrmem_create (&xdr, buf, sizeof buf, XDR_ENCODE);
if (!xdr_guestfs_chunk (&xdr, (guestfs_chunk *) chunk)) {
- fprintf (stderr, "send_chunk: failed to encode chunk\n");
+ fprintf (stderr, "guestfsd: send_chunk: failed to encode chunk\n");
xdr_destroy (&xdr);
return -1;
}
int err = (xwrite (sock, lenbuf, 4) == 0
&& xwrite (sock, buf, len) == 0 ? 0 : -1);
if (err) {
- fprintf (stderr, "send_chunk: write failed\n");
+ fprintf (stderr, "guestfsd: send_chunk: write failed\n");
exit (EXIT_FAILURE);
}
return err;
}
+
+/* Initial delay before sending notification messages, and
+ * the period at which we send them thereafter. These times
+ * are in microseconds.
+ */
+#define NOTIFICATION_INITIAL_DELAY 2000000
+#define NOTIFICATION_PERIOD 333333
+
+void
+notify_progress (uint64_t position, uint64_t total)
+{
+ struct timeval now_t;
+ gettimeofday (&now_t, NULL);
+
+ /* Always send a notification at 100%. This simplifies callers by
+ * allowing them to 'finish' the progress bar at 100% without
+ * needing special code.
+ */
+ if (count_progress > 0 && position == total)
+ goto send;
+
+ /* Calculate time in microseconds since the last progress message
+ * was sent out (or since the start of the call).
+ */
+ int64_t last_us, now_us, elapsed_us;
+ last_us =
+ (int64_t) last_progress_t.tv_sec * 1000000 + last_progress_t.tv_usec;
+ now_us = (int64_t) now_t.tv_sec * 1000000 + now_t.tv_usec;
+ elapsed_us = now_us - last_us;
+
+ /* Rate limit. */
+ if ((count_progress == 0 && elapsed_us < NOTIFICATION_INITIAL_DELAY) ||
+ (count_progress > 0 && elapsed_us < NOTIFICATION_PERIOD))
+ return;
+
+ send:
+ /* We're going to send a message now ... */
+ count_progress++;
+ last_progress_t = now_t;
+
+ /* Send the header word. */
+ XDR xdr;
+ char buf[128];
+ uint32_t i = GUESTFS_PROGRESS_FLAG;
+ size_t len;
+ xdrmem_create (&xdr, buf, 4, XDR_ENCODE);
+ xdr_u_int (&xdr, &i);
+ xdr_destroy (&xdr);
+
+ if (xwrite (sock, buf, 4) == -1) {
+ fprintf (stderr, "guestfsd: xwrite failed\n");
+ exit (EXIT_FAILURE);
+ }
+
+ guestfs_progress message = {
+ .proc = proc_nr,
+ .serial = serial,
+ .position = position,
+ .total = total,
+ };
+
+ xdrmem_create (&xdr, buf, sizeof buf, XDR_ENCODE);
+ if (!xdr_guestfs_progress (&xdr, &message)) {
+ fprintf (stderr, "guestfsd: xdr_guestfs_progress: failed to encode message\n");
+ xdr_destroy (&xdr);
+ return;
+ }
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ if (xwrite (sock, buf, len) == -1) {
+ fprintf (stderr, "guestfsd: xwrite failed\n");
+ exit (EXIT_FAILURE);
+ }
+}
+
+/* "Pulse mode" progress messages. */
+
+#if defined(HAVE_SETITIMER) && defined(HAVE_SIGACTION)
+
+static void async_safe_send_pulse (int sig);
+
+void
+pulse_mode_start (void)
+{
+ struct sigaction act;
+ struct itimerval it;
+
+ memset (&act, 0, sizeof act);
+ act.sa_handler = async_safe_send_pulse;
+ act.sa_flags = SA_RESTART;
+
+ if (sigaction (SIGALRM, &act, NULL) == -1) {
+ perror ("pulse_mode_start: sigaction");
+ return;
+ }
+
+ it.it_value.tv_sec = NOTIFICATION_INITIAL_DELAY / 1000000;
+ it.it_value.tv_usec = NOTIFICATION_INITIAL_DELAY % 1000000;
+ it.it_interval.tv_sec = NOTIFICATION_PERIOD / 1000000;
+ it.it_interval.tv_usec = NOTIFICATION_PERIOD % 1000000;
+
+ if (setitimer (ITIMER_REAL, &it, NULL) == -1)
+ perror ("pulse_mode_start: setitimer");
+}
+
+void
+pulse_mode_end (void)
+{
+ pulse_mode_cancel (); /* Cancel the itimer. */
+
+ notify_progress (1, 1);
+}
+
+void
+pulse_mode_cancel (void)
+{
+ int err = errno; /* Function must preserve errno. */
+ struct itimerval it;
+ struct sigaction act;
+
+ /* Setting it_value to zero cancels the itimer. */
+ it.it_value.tv_sec = 0;
+ it.it_value.tv_usec = 0;
+ it.it_interval.tv_sec = 0;
+ it.it_interval.tv_usec = 0;
+
+ if (setitimer (ITIMER_REAL, &it, NULL) == -1)
+ perror ("pulse_mode_cancel: setitimer");
+
+ memset (&act, 0, sizeof act);
+ act.sa_handler = SIG_DFL;
+
+ if (sigaction (SIGALRM, &act, NULL) == -1)
+ perror ("pulse_mode_cancel: sigaction");
+
+ errno = err;
+}
+
+/* Send a position = 0, total = 1 (pulse mode) message. The tricky
+ * part is we have to do it without invoking any non-async-safe
+ * functions (see signal(7) for a list). Therefore, KISS.
+ */
+static void
+async_safe_send_pulse (int sig)
+{
+ /* XDR is a RFC ... */
+ unsigned char msg[] = {
+ (GUESTFS_PROGRESS_FLAG & 0xff000000) >> 24,
+ (GUESTFS_PROGRESS_FLAG & 0x00ff0000) >> 16,
+ (GUESTFS_PROGRESS_FLAG & 0x0000ff00) >> 8,
+ GUESTFS_PROGRESS_FLAG & 0x000000ff,
+ (proc_nr & 0xff000000) >> 24,
+ (proc_nr & 0x00ff0000) >> 16,
+ (proc_nr & 0x0000ff00) >> 8,
+ proc_nr & 0x000000ff,
+ (serial & 0xff000000) >> 24,
+ (serial & 0x00ff0000) >> 16,
+ (serial & 0x0000ff00) >> 8,
+ serial & 0x000000ff,
+ /* 64 bit position = 0 */ 0, 0, 0, 0, 0, 0, 0, 0,
+ /* 64 bit total = 1 */ 0, 0, 0, 0, 0, 0, 0, 1
+ };
+
+ if (xwrite (sock, msg, sizeof msg) == -1)
+ exit (EXIT_FAILURE);
+}
+
+#else /* !HAVE_SETITIMER || !HAVE_SIGACTION */
+
+void
+pulse_mode_start (void)
+{
+ /* empty */
+}
+
+void
+pulse_mode_end (void)
+{
+ /* empty */
+}
+
+void
+pulse_mode_cancel (void)
+{
+ /* empty */
+}
+
+#endif /* !HAVE_SETITIMER || !HAVE_SIGACTION */
git.annexia.org / libguestfs.git / blobdiff