static int
check_for_daemon_cancellation_or_eof (guestfs_h *g, int fd)
{
char summary[MAX_MESSAGE_SUMMARY];
char buf[4];
ssize_t n;
uint32_t flag;
XDR xdr;
n = really_read_from_socket (g, fd, buf, 4);
if (n == -1)
return -1;
if (n == 0) {
/* Hopefully this indicates the qemu child process has died. */
child_cleanup (g);
return -1;
}
debug (g, "check_for_daemon_cancellation_or_eof: %s",
message_summary (buf, 4, summary));
xdrmem_create (&xdr, buf, 4, XDR_DECODE);
xdr_uint32_t (&xdr, &flag);
xdr_destroy (&xdr);
/* Read and process progress messages that happen during FileIn. */
if (flag == GUESTFS_PROGRESS_FLAG) {
char buf[PROGRESS_MESSAGE_SIZE];
guestfs_progress message;
n = really_read_from_socket (g, fd, buf, PROGRESS_MESSAGE_SIZE);
if (n == -1)
return -1;
if (n == 0) {
child_cleanup (g);
return -1;
}
xdrmem_create (&xdr, buf, PROGRESS_MESSAGE_SIZE, XDR_DECODE);
xdr_guestfs_progress (&xdr, &message);
xdr_destroy (&xdr);
guestfs___progress_message_callback (g, &message);
return 0;
}
if (flag != GUESTFS_CANCEL_FLAG) {
error (g, _("check_for_daemon_cancellation_or_eof: read 0x%x from daemon, expected 0x%x\n"),
flag, GUESTFS_CANCEL_FLAG);
return -1;
}
return -2;
}
/* launch (of the appliance) generates approximate progress
* messages. Currently these are defined as follows:
*
* 0 / 12: launch clock starts
* 3 / 12: appliance created
* 6 / 12: detected that guest kernel started
* 9 / 12: detected that /init script is running
* 12 / 12: launch completed successfully
*
* Notes:
* (1) This is not a documented ABI and the behaviour may be changed
* or removed in future.
* (2) Messages are only sent if more than 5 seconds has elapsed
* since the launch clock started.
* (3) There is a hack in proto.c to make this work.
*/
void
guestfs___launch_send_progress (guestfs_h *g, int perdozen)
{
struct timeval tv;
gettimeofday (&tv, NULL);
if (guestfs___timeval_diff (&g->launch_t, &tv) >= 5000) {
guestfs_progress progress_message =
{ .proc = 0, .serial = 0, .position = perdozen, .total = 12 };
guestfs___progress_message_callback (g, &progress_message);
}
}
int
guestfs___recv_from_daemon (guestfs_h *g, uint32_t *size_rtn, void **buf_rtn)
{
char summary[MAX_MESSAGE_SUMMARY];
fd_set rset, rset2;
FD_ZERO (&rset);
if (g->fd[1] >= 0) /* Read qemu stdout for log messages & EOF. */
FD_SET (g->fd[1], &rset);
FD_SET (g->sock, &rset); /* Read socket for data & EOF. */
int max_fd = MAX (g->sock, g->fd[1]);
*size_rtn = 0;
*buf_rtn = NULL;
char lenbuf[4];
/* nr is the size of the message, but we prime it as -4 because we
* have to read the message length word first.
*/
ssize_t nr = -4;
for (;;) {
ssize_t message_size =
*size_rtn != GUESTFS_PROGRESS_FLAG ?
*size_rtn : PROGRESS_MESSAGE_SIZE;
if (nr >= message_size)
break;
rset2 = rset;
int r = select (max_fd+1, &rset2, NULL, NULL, NULL);
if (r == -1) {
if (errno == EINTR || errno == EAGAIN)
continue;
perrorf (g, "select");
free (*buf_rtn);
*buf_rtn = NULL;
return -1;
}
if (g->fd[1] >= 0 && FD_ISSET (g->fd[1], &rset2)) {
if (read_log_message_or_eof (g, g->fd[1], 0) == -1) {
free (*buf_rtn);
*buf_rtn = NULL;
return -1;
}
}
if (FD_ISSET (g->sock, &rset2)) {
if (nr < 0) { /* Have we read the message length word yet? */
r = read (g->sock, lenbuf+nr+4, -nr);
if (r == -1) {
if (errno == EINTR || errno == EAGAIN)
continue;
int err = errno;
perrorf (g, "read");
/* Under some circumstances we see "Connection reset by peer"
* here when the child dies suddenly. Catch this and call
* the cleanup function, same as for EOF.
*/
if (err == ECONNRESET)
child_cleanup (g);
return -1;
}
if (r == 0) {
unexpected_end_of_file_from_daemon_error (g);
child_cleanup (g);
return -1;
}
nr += r;
if (nr < 0) /* Still not got the whole length word. */
continue;
XDR xdr;
xdrmem_create (&xdr, lenbuf, 4, XDR_DECODE);
xdr_uint32_t (&xdr, size_rtn);
xdr_destroy (&xdr);
/* *size_rtn changed, recalculate message_size */
message_size =
*size_rtn != GUESTFS_PROGRESS_FLAG ?
*size_rtn : PROGRESS_MESSAGE_SIZE;
if (*size_rtn == GUESTFS_LAUNCH_FLAG) {
if (g->state != LAUNCHING)
error (g, _("received magic signature from guestfsd, but in state %d"),
g->state);
else {
g->state = READY;
guestfs___call_callbacks_void (g, GUESTFS_EVENT_LAUNCH_DONE);
}
debug (g, "recv_from_daemon: received GUESTFS_LAUNCH_FLAG");
return 0;
}
else if (*size_rtn == GUESTFS_CANCEL_FLAG) {
debug (g, "recv_from_daemon: received GUESTFS_CANCEL_FLAG");
return 0;
}
else if (*size_rtn == GUESTFS_PROGRESS_FLAG)
/*FALLTHROUGH*/;
/* If this happens, it's pretty bad and we've probably lost
* synchronization.
*/
else if (*size_rtn > GUESTFS_MESSAGE_MAX) {
error (g, _("message length (%u) > maximum possible size (%d)"),
(unsigned) *size_rtn, GUESTFS_MESSAGE_MAX);
return -1;
}
/* Allocate the complete buffer, size now known. */
*buf_rtn = safe_malloc (g, message_size);
/*FALLTHROUGH*/
}
size_t sizetoread = message_size - nr;
if (sizetoread > BUFSIZ) sizetoread = BUFSIZ;
r = read (g->sock, (char *) (*buf_rtn) + nr, sizetoread);
if (r == -1) {
if (errno == EINTR || errno == EAGAIN)
continue;
perrorf (g, "read");
free (*buf_rtn);
*buf_rtn = NULL;
return -1;
}
if (r == 0) {
unexpected_end_of_file_from_daemon_error (g);
child_cleanup (g);
free (*buf_rtn);
*buf_rtn = NULL;
return -1;
}
nr += r;
}
}
/* Got the full message, caller can start processing it. */
#ifdef ENABLE_PACKET_DUMP
if (g->verbose) {
ssize_t i, j;
for (i = 0; i < nr; i += 16) {
printf ("%04zx: ", i);
for (j = i; j < MIN (i+16, nr); ++j)
printf ("%02x ", (*(unsigned char **)buf_rtn)[j]);
for (; j < i+16; ++j)
printf (" ");
printf ("|");
for (j = i; j < MIN (i+16, nr); ++j)
if (c_isprint ((*(char **)buf_rtn)[j]))
printf ("%c", (*(char **)buf_rtn)[j]);
else
printf (".");
for (; j < i+16; ++j)
printf (" ");
printf ("|\n");
}
}
#endif
if (*size_rtn == GUESTFS_PROGRESS_FLAG) {
guestfs_progress message;
XDR xdr;
xdrmem_create (&xdr, *buf_rtn, PROGRESS_MESSAGE_SIZE, XDR_DECODE);
xdr_guestfs_progress (&xdr, &message);
xdr_destroy (&xdr);
guestfs___progress_message_callback (g, &message);
free (*buf_rtn);
*buf_rtn = NULL;
/* Process next message. */
return guestfs___recv_from_daemon (g, size_rtn, buf_rtn);
}
debug (g, "recv_from_daemon: %" PRIu32 " bytes: %s", *size_rtn,
message_summary (*buf_rtn, *size_rtn, summary));
return 0;
}
