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/* libguestfs
* Copyright (C) 2009-2020 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* Helper functions for the actions code in F<lib/actions-*.c>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include "guestfs.h"
#include "guestfs-internal.h"
#include "guestfs_protocol.h"
/* Check the return message from a call for validity. */
int
guestfs_int_check_reply_header (guestfs_h *g,
const struct guestfs_message_header *hdr,
unsigned int proc_nr, unsigned int serial)
{
if (hdr->prog != GUESTFS_PROGRAM) {
error (g, "wrong program (%u/%d)", hdr->prog, GUESTFS_PROGRAM);
return -1;
}
if (hdr->vers != GUESTFS_PROTOCOL_VERSION) {
error (g, "wrong protocol version (%u/%d)",
hdr->vers, GUESTFS_PROTOCOL_VERSION);
return -1;
}
if (hdr->direction != GUESTFS_DIRECTION_REPLY) {
error (g, "unexpected message direction (%d/%d)",
(int) hdr->direction, GUESTFS_DIRECTION_REPLY);
return -1;
}
if (hdr->proc != proc_nr) {
error (g, "unexpected procedure number (%d/%u)", (int) hdr->proc, proc_nr);
return -1;
}
if (hdr->serial != serial) {
error (g, "unexpected serial (%u/%u)", hdr->serial, serial);
return -1;
}
return 0;
}
/* Check the appliance is up when running a daemon_function. */
int
guestfs_int_check_appliance_up (guestfs_h *g, const char *caller)
{
if (g->state == CONFIG || g->state == LAUNCHING) {
error (g, "%s: call launch before using this function\n(in guestfish, don't forget to use the 'run' command)",
caller);
return -1;
}
return 0;
}
/* Convenience wrapper for tracing. */
void
guestfs_int_trace_open (struct trace_buffer *tb)
{
tb->buf = NULL;
tb->len = 0;
tb->fp = open_memstream (&tb->buf, &tb->len);
if (tb->fp)
tb->opened = true;
else {
tb->opened = false;
/* Fall back to writing messages to stderr. */
free (tb->buf);
tb->buf = NULL;
tb->fp = stderr;
}
}
void
guestfs_int_trace_send_line (guestfs_h *g, struct trace_buffer *tb)
{
if (tb->opened) {
fclose (tb->fp);
tb->fp = NULL;
guestfs_int_call_callbacks_message (g, GUESTFS_EVENT_TRACE, tb->buf, tb->len);
free (tb->buf);
tb->buf = NULL;
}
}
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