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/*
* virkmod.c: helper APIs for managing kernel modules
*
* Copyright (C) 2014 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 2.1 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, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include "viralloc.h"
#include "virkmod.h"
#include "vircommand.h"
static int
doModprobe(const char *opts, const char *module, char **outbuf, char **errbuf)
{
g_autoptr(virCommand) cmd = NULL;
cmd = virCommandNewArgList(MODPROBE, opts, NULL);
if (module)
virCommandAddArg(cmd, module);
if (outbuf)
virCommandSetOutputBuffer(cmd, outbuf);
if (errbuf)
virCommandSetErrorBuffer(cmd, errbuf);
if (virCommandRun(cmd, NULL) < 0)
return -1;
return 0;
}
static int
doRmmod(const char *module, char **errbuf)
{
g_autoptr(virCommand) cmd = NULL;
cmd = virCommandNewArgList(RMMOD, module, NULL);
virCommandSetErrorBuffer(cmd, errbuf);
if (virCommandRun(cmd, NULL) < 0)
return -1;
return 0;
}
/**
* virKModLoad:
* @module: Name of the module to load
*
* Attempts to load a kernel module
*
* returns NULL in case of success and the error buffer output from the
* virCommandRun() on failure. The returned buffer must be VIR_FREE()
* by the caller
*/
char *
virKModLoad(const char *module)
{
char *errbuf = NULL;
if (doModprobe("-b", module, NULL, &errbuf) < 0)
return errbuf;
VIR_FREE(errbuf);
return NULL;
}
/**
* virKModUnload:
* @module: Name of the module to unload
*
* Remove or unload a module.
*
* NB: Do not use 'modprobe -r' here as that code will recursively
* unload any modules that were dependencies of the one being removed
* even if things still require them. e.g. it'll see the 'bridge'
* module has refcount of 0 and remove it, even if there are bridges
* created on the host
*
* returns NULL in case of success and the error buffer output from the
* virCommandRun() on failure. The returned buffer must be VIR_FREE()
* by the caller
*/
char *
virKModUnload(const char *module)
{
char *errbuf = NULL;
if (doRmmod(module, &errbuf) < 0)
return errbuf;
VIR_FREE(errbuf);
return NULL;
}
/**
* virKModIsProhibited:
* @module: Name of the module to check
*
* Determine if loading of @module is prohibited by admin
* configuration.
*
* returns true when found prohibited, false otherwise.
*/
bool
virKModIsProhibited(const char *module)
{
size_t i;
g_autofree char *drvmatch = NULL;
g_autofree char *outbuf = NULL;
drvmatch = g_strdup_printf("blacklist %s\n", module);
/* modprobe will convert all '-' into '_', so we need to as well */
for (i = 0; i < drvmatch[i]; i++)
if (drvmatch[i] == '-')
drvmatch[i] = '_';
if (doModprobe("-c", NULL, &outbuf, NULL) < 0)
return false;
if (strstr(outbuf, drvmatch))
return true;
return false;
}
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