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/******************************************************************************
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright (C) 2005 Rusty Russell IBM Corporation
*
* 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 the Free Software Foundation, version 2 of the
* License.
*/
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/mman.h>
#include <strings.h>
#include <ucred.h>
#include <stdio.h>
#include <xen/sys/xenbus.h>
#include "talloc.h"
#include "xenstored_core.h"
#include "xenstored_probes.h"
evtchn_port_t xenbus_evtchn(void)
{
int fd;
evtchn_port_t port;
fd = open("/dev/xen/xenbus", O_RDONLY);
if (fd == -1)
return -1;
port = ioctl(fd, IOCTL_XENBUS_XENSTORE_EVTCHN);
close(fd);
return port;
}
void *xenbus_map(void)
{
int fd;
void *addr;
fd = open("/dev/xen/xenbus", O_RDWR);
if (fd == -1)
return NULL;
addr = mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE,
MAP_SHARED, fd, 0);
if (addr == MAP_FAILED)
addr = NULL;
close(fd);
return addr;
}
void xenbus_notify_running(void)
{
int fd;
fd = open("/dev/xen/xenbus", O_RDONLY);
(void) ioctl(fd, IOCTL_XENBUS_NOTIFY_UP);
close(fd);
}
static pid_t cred(const struct connection *conn)
{
ucred_t *ucred = NULL;
pid_t pid;
if (conn->domain)
return (0);
if (getpeerucred(conn->fd, &ucred) == -1)
return (0);
pid = ucred_getpid(ucred);
ucred_free(ucred);
return (pid);
}
/*
* The strings are often a number of nil-separated strings. We'll just
* replace the separators with spaces - not quite right, but good
* enough.
*/
static char *
mangle(const struct connection *conn, const struct buffered_data *in)
{
char *str;
int i;
if (in->hdr.msg.len == 0)
return (talloc_strdup(conn, ""));
if ((str = talloc_zero_size(conn, in->hdr.msg.len + 1)) == NULL)
return (NULL);
memcpy(str, in->buffer, in->hdr.msg.len);
/*
* The protocol is absurdly inconsistent in whether the length
* includes the terminating nil or not; replace all nils that
* aren't the last one.
*/
for (i = 0; i < (in->hdr.msg.len - 1); i++) {
if (str[i] == '\0')
str[i] = ' ';
}
return (str);
}
void
dtrace_io(const struct connection *conn, const struct buffered_data *in,
int io_out)
{
if (!io_out) {
if (XENSTORE_MSG_ENABLED()) {
char *mangled = mangle(conn, in);
XENSTORE_MSG(in->hdr.msg.tx_id, conn->id, cred(conn),
in->hdr.msg.type, mangled);
}
goto out;
}
switch (in->hdr.msg.type) {
case XS_ERROR:
if (XENSTORE_ERROR_ENABLED()) {
char *mangled = mangle(conn, in);
XENSTORE_ERROR(in->hdr.msg.tx_id, conn->id,
cred(conn), mangled);
}
break;
case XS_WATCH_EVENT:
if (XENSTORE_WATCH_EVENT_ENABLED()) {
char *mangled = mangle(conn, in);
XENSTORE_WATCH_EVENT(conn->id, cred(conn), mangled);
}
break;
default:
if (XENSTORE_REPLY_ENABLED()) {
char *mangled = mangle(conn, in);
XENSTORE_REPLY(in->hdr.msg.tx_id, conn->id, cred(conn),
in->hdr.msg.type, mangled);
}
break;
}
out:
/*
* 6589130 dtrace -G fails for certain tail-calls on x86
*/
asm("nop");
}
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