/* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009 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 <unistd.h>
#include <errno.h>
#include <ctype.h>
+#include <sys/param.h> /* defines MIN */
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "daemon.h"
#include "../src/guestfs_protocol.h"
-/* XXX We should make this configurable from /proc/cmdline so that the
- * verbose setting of the guestfs_h can be inherited here.
- */
-#define DEBUG 1
-
/* The message currently being processed. */
int proc_nr;
int serial;
char lenbuf[4];
unsigned len;
struct guestfs_message_header hdr;
+ struct timeval start_t, end_t;
+ int64_t start_us, end_us, elapsed_us;
sock = _sock;
for (;;) {
+#if 0
+ /* Most common errors are leaked memory and leaked file descriptors,
+ * so run this between each command:
+ */
+ if (verbose)
+ system ("ls -l /proc/self/fd");
+#endif
+
/* Read the length word. */
xread (sock, lenbuf, 4);
xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
xread (sock, buf, len);
-#if DEBUG
- int i, j;
-
-#define MIN(a,b) ((a)<(b)?(a):(b))
-
- for (i = 0; i < len; i += 16) {
- printf ("%04x: ", i);
- for (j = i; j < MIN (i+16, len); ++j)
- printf ("%02x ", (unsigned char) buf[j]);
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|");
- for (j = i; j < MIN (i+16, len); ++j)
- if (isprint (buf[j]))
- printf ("%c", buf[j]);
- else
- printf (".");
- for (; j < i+16; ++j)
- printf (" ");
- printf ("|\n");
+#if 0
+ if (verbose) {
+ int i, j;
+
+ for (i = 0; i < len; i += 16) {
+ printf ("%04x: ", i);
+ for (j = i; j < MIN (i+16, len); ++j)
+ printf ("%02x ", (unsigned char) buf[j]);
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|");
+ for (j = i; j < MIN (i+16, len); ++j)
+ if (isprint (buf[j]))
+ printf ("%c", buf[j]);
+ else
+ printf (".");
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|\n");
+ }
}
#endif
+ /* In verbose mode, display the time taken to run each command. */
+ if (verbose)
+ gettimeofday (&start_t, NULL);
+
/* Decode the message header. */
xdrmem_create (&xdr, buf, len, XDR_DECODE);
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
dispatch_incoming_message (&xdr);
/* Note that dispatch_incoming_message will also send a reply. */
+ /* In verbose mode, display the time taken to run each command. */
+ if (verbose) {
+ gettimeofday (&end_t, NULL);
+
+ 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",
+ proc_nr,
+ proc_nr >= 0 && proc_nr < GUESTFS_PROC_NR_PROCS
+ ? function_names[proc_nr] : "UNKNOWN PROCEDURE",
+ (int) (elapsed_us / 1000000),
+ (int) ((elapsed_us / 10000) % 100));
+ }
+
cont:
xdr_destroy (&xdr);
free (buf);
exit (1);
}
- err.error = (char *) msg;
+ err.error_message = (char *) msg;
if (!xdr_guestfs_message_error (&xdr, &err)) {
fprintf (stderr, "guestfsd: failed to encode error message body\n");
xdr_uint32_t (&xdr, &len);
xdr_destroy (&xdr);
- xwrite (sock, lenbuf, 4);
- xwrite (sock, buf, len);
+ if (xwrite (sock, lenbuf, 4) == -1) {
+ fprintf (stderr, "xwrite failed\n");
+ exit (1);
+ }
+ if (xwrite (sock, buf, len) == -1) {
+ fprintf (stderr, "xwrite failed\n");
+ exit (1);
+ }
}
void
}
if (xdrp) {
+ /* This can fail if the reply body is too large, for example
+ * if it exceeds the maximum message size. In that case
+ * we want to return an error message instead. (RHBZ#509597).
+ */
if (!(*xdrp) (&xdr, ret)) {
- fprintf (stderr, "guestfsd: failed to encode reply body\n");
+ reply_with_perror ("guestfsd: failed to encode reply body\n");
+ xdr_destroy (&xdr);
+ return;
+ }
+ }
+
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ xdrmem_create (&xdr, lenbuf, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+ xdr_destroy (&xdr);
+
+ if (xwrite (sock, lenbuf, 4) == -1) {
+ fprintf (stderr, "xwrite failed\n");
+ exit (1);
+ }
+ if (xwrite (sock, buf, len) == len) {
+ fprintf (stderr, "xwrite failed\n");
+ exit (1);
+ }
+}
+
+/* Receive file chunks, repeatedly calling 'cb'. */
+int
+receive_file (receive_cb cb, void *opaque)
+{
+ guestfs_chunk chunk;
+ char lenbuf[4];
+ char *buf;
+ XDR xdr;
+ int r;
+ uint32_t len;
+
+ for (;;) {
+ /* Read the length word. */
+ xread (sock, lenbuf, 4);
+ xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
+ xdr_uint32_t (&xdr, &len);
+ xdr_destroy (&xdr);
+
+ if (len == GUESTFS_CANCEL_FLAG)
+ continue; /* Just ignore it. */
+
+ if (len > GUESTFS_MESSAGE_MAX) {
+ fprintf (stderr, "guestfsd: incoming message is too long (%u bytes)\n",
+ len);
exit (1);
}
+
+ buf = malloc (len);
+ if (!buf) {
+ perror ("malloc");
+ return -1;
+ }
+
+ xread (sock, buf, len);
+
+ xdrmem_create (&xdr, buf, len, XDR_DECODE);
+ memset (&chunk, 0, sizeof chunk);
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ xdr_destroy (&xdr);
+ free (buf);
+ return -1;
+ }
+ xdr_destroy (&xdr);
+ free (buf);
+
+ if (verbose)
+ printf ("receive_file: got chunk: cancel = %d, len = %d, buf = %p\n",
+ chunk.cancel, chunk.data.data_len, chunk.data.data_val);
+
+ if (chunk.cancel) {
+ fprintf (stderr, "receive_file: received cancellation from library\n");
+ xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
+ return -2;
+ }
+ if (chunk.data.data_len == 0) {
+ xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
+ return 0; /* end of file */
+ }
+
+ if (cb)
+ r = cb (opaque, chunk.data.data_val, chunk.data.data_len);
+ else
+ r = 0;
+
+ xdr_free ((xdrproc_t) xdr_guestfs_chunk, (char *) &chunk);
+ if (r == -1) /* write error */
+ return -1;
+ }
+}
+
+/* Send a cancellation flag back to the library. */
+void
+cancel_receive (void)
+{
+ 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 (sock, fbuf, sizeof fbuf) == -1) {
+ perror ("write to socket");
+ return;
+ }
+
+ /* Keep receiving chunks and discarding, until library sees cancel. */
+ (void) receive_file (NULL, NULL);
+}
+
+static int check_for_library_cancellation (void);
+static int send_chunk (const guestfs_chunk *);
+
+/* Also check if the library sends us a cancellation message. */
+int
+send_file_write (const void *buf, int len)
+{
+ guestfs_chunk chunk;
+ int cancel;
+
+ if (len > GUESTFS_MAX_CHUNK_SIZE) {
+ fprintf (stderr, "send_file_write: len (%d) > GUESTFS_MAX_CHUNK_SIZE (%d)\n",
+ len, GUESTFS_MAX_CHUNK_SIZE);
+ return -1;
+ }
+
+ cancel = check_for_library_cancellation ();
+
+ if (cancel) {
+ chunk.cancel = 1;
+ chunk.data.data_len = 0;
+ chunk.data.data_val = NULL;
+ } else {
+ chunk.cancel = 0;
+ chunk.data.data_len = len;
+ chunk.data.data_val = (char *) buf;
+ }
+
+ if (send_chunk (&chunk) == -1)
+ return -1;
+
+ if (cancel) return -2;
+ return 0;
+}
+
+static int
+check_for_library_cancellation (void)
+{
+ fd_set rset;
+ struct timeval tv;
+ int r;
+ char buf[4];
+ uint32_t flag;
+ XDR xdr;
+
+ FD_ZERO (&rset);
+ FD_SET (sock, &rset);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ r = select (sock+1, &rset, NULL, NULL, &tv);
+ if (r == -1) {
+ perror ("select");
+ return 0;
+ }
+ if (r == 0)
+ return 0;
+
+ /* Read the message from the daemon. */
+ r = xread (sock, buf, sizeof buf);
+ if (r == -1) {
+ perror ("read");
+ return 0;
+ }
+
+ xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (flag != GUESTFS_CANCEL_FLAG) {
+ fprintf (stderr, "check_for_library_cancellation: read 0x%x from library, expected 0x%x\n",
+ flag, GUESTFS_CANCEL_FLAG);
+ return 0;
+ }
+
+ return 1;
+}
+
+void
+send_file_end (int cancel)
+{
+ guestfs_chunk chunk;
+
+ chunk.cancel = cancel;
+ chunk.data.data_len = 0;
+ chunk.data.data_val = NULL;
+ send_chunk (&chunk);
+}
+
+static int
+send_chunk (const guestfs_chunk *chunk)
+{
+ char buf[GUESTFS_MAX_CHUNK_SIZE + 48];
+ char lenbuf[4];
+ XDR xdr;
+ uint32_t len;
+
+ 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");
+ xdr_destroy (&xdr);
+ return -1;
}
len = xdr_getpos (&xdr);
xdr_uint32_t (&xdr, &len);
xdr_destroy (&xdr);
- xwrite (sock, lenbuf, 4);
- xwrite (sock, buf, len);
+ (void) xwrite (sock, lenbuf, 4);
+ (void) xwrite (sock, buf, len);
+
+ return 0;
}
git.annexia.org / libguestfs.git / blobdiff