#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);
-
#define error guestfs_error
#define perrorf guestfs_perrorf
#define safe_malloc guestfs_safe_malloc
int autosync;
const char *path;
+ const char *qemu;
char *last_error;
str = getenv ("LIBGUESTFS_PATH");
g->path = str != NULL ? str : GUESTFS_DEFAULT_PATH;
- /* XXX We should probably make QEMU configurable as well. */
+
+ str = getenv ("LIBGUESTFS_QEMU");
+ g->qemu = str != NULL ? str : QEMU;
g->main_loop = guestfs_get_default_main_loop ();
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)
+ return -1;
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
void
guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
{
return g->path;
}
+int
+guestfs_set_qemu (guestfs_h *g, const char *qemu)
+{
+ if (qemu == NULL)
+ g->qemu = QEMU;
+ else
+ g->qemu = qemu;
+ return 0;
+}
+
+const char *
+guestfs_get_qemu (guestfs_h *g)
+{
+ return g->qemu;
+}
+
/* Add a string to the current command line. */
static void
incr_cmdline_size (guestfs_h *g)
/* 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] = (char *) 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);
+ "console=ttyS0 guestfs=%s:%d%s",
+ VMCHANNEL_ADDR, VMCHANNEL_PORT,
+ g->verbose ? " guestfs_verbose=1" : "");
add_cmdline (g, "-m");
add_cmdline (g, "384"); /* XXX Choose best size. */
+#if 0
add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
+#endif
add_cmdline (g, "-kernel");
add_cmdline (g, (char *) kernel);
add_cmdline (g, "-initrd");
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);
}
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;
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;
+}
+
/* Structure-freeing functions. These rely on the fact that the
* structure format is identical to the XDR format. See note in
* generator.ml.
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);
* 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",
g->state);
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)",
len, GUESTFS_MESSAGE_MAX);
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 (g->verbose) {
int i, j;
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);
+ 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. */
if (g->msg_in_allocated > 65536) {
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__send (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
+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_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;
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;
}
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);
- /* 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");
+ 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 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;
+ 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 len)
+{
+ char data[GUESTFS_MAX_CHUNK_SIZE + 48];
+ unsigned datalen;
+ 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;
}
+ /* Did the daemon send a cancellation message? */
+ if (check_for_daemon_cancellation (g)) {
+ if (g->verbose)
+ fprintf (stderr, "got daemon cancellation\n");
+ return -2;
+ }
+
/* Serialize the chunk. */
chunk.cancel = cancel;
chunk.data.data_len = len;
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);
+ if (g->verbose)
+ fprintf (stderr,
+ "library sending chunk cancel = %d, len = %zu, buf = %p\n",
+ cancel, len, buf);
+
+ xdrmem_create (&xdr, data, sizeof data, XDR_ENCODE);
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ error (g, "xdr_guestfs_chunk failed (buf = %p, len = %zu)", buf, len);
+ xdr_destroy (&xdr);
return -1;
}
- chunkdatalen = xdr_getpos (&xdr);
- xdr_destroy (&xdr);
-
- len = xdr_getpos (&xdr);
+ datalen = xdr_getpos (&xdr);
xdr_destroy (&xdr);
- data = safe_realloc (g, data, len);
- g->msg_out = data;
- g->msg_out_size = len;
+ /* Allocate outgoing message buffer. */
+ g->msg_out = safe_malloc (g, datalen + 4);
+ g->msg_out_size = datalen + 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, &datalen);
+
+ memcpy (g->msg_out + 4, data, datalen);
+
+ 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. */
+
+static int receive_file_data_sync (guestfs_h *g, void **buf);
+
+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;
+
+ 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)) > 0) {
+ if (xwrite (fd, buf, r) == -1) {
+ perrorf (g, "%s: write", filename);
+ free (buf);
+ goto cancel;
+ }
+ free (buf);
+ }
+
+ 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, &buf)) > 0)
+ free (buf); /* just discard it */
+
+ return -1;
}
-/* Send a file complete chunk. */
+struct receive_file_ctx {
+ int code;
+ void **buf;
+};
+
+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;
+
+ ml->main_loop_quit (ml, g);
+
+ memset (&chunk, 0, sizeof chunk);
+
+ if (!xdr_guestfs_chunk (xdr, &chunk)) {
+ error (g, "failed to parse file chunk");
+ ctx->code = -1;
+ return;
+ }
+ if (chunk.cancel) {
+ error (g, "file receive cancelled by daemon");
+ ctx->code = -2;
+ return;
+ }
+ if (chunk.data.data_len == 0) { /* end of transfer */
+ ctx->code = 0;
+ return;
+ }
+
+ ctx->code = chunk.data.data_len;
+ *ctx->buf = chunk.data.data_val; /* caller frees */
+}
+
+/* Receive a chunk of file data. */
static int
-send_file_complete (guestfs_h *g)
+receive_file_data_sync (guestfs_h *g, void **buf)
{
- 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);
+
+ ctx.code = -3;
+ ctx.buf = buf;
+
+ guestfs_set_reply_callback (g, receive_file_cb, &ctx);
+ (void) ml->main_loop_run (ml, g);
+ guestfs_set_reply_callback (g, NULL, NULL);
+
+ if (g->verbose)
+ fprintf (stderr, "receive_file_data_sync: code %d\n", ctx.code);
+
+ switch (ctx.code) {
+ case 0: /* end of file */
+ return 0;
+ case -1: case -2:
+ return -1;
+ case -3:
+ error (g, "failed to call receive_file_cb");
+ return -1;
+ default: /* received n bytes of data */
+ return ctx.code;
+ }
}
-#endif
/* This is the default main loop implementation, using select(2). */
{
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