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e8645610c8
This new naming matches the terminology used in the error messages that the callers report. Reviewed-by: Peter Krempa <pkrempa@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
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* virkmod.c: helper APIs for managing kernel modules
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*
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* Copyright (C) 2014 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#include <config.h>
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#include "viralloc.h"
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#include "virkmod.h"
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#include "vircommand.h"
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#include "virstring.h"
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static int
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doModprobe(const char *opts, const char *module, char **outbuf, char **errbuf)
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{
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g_autoptr(virCommand) cmd = NULL;
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cmd = virCommandNewArgList(MODPROBE, opts, NULL);
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if (module)
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virCommandAddArg(cmd, module);
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if (outbuf)
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virCommandSetOutputBuffer(cmd, outbuf);
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if (errbuf)
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virCommandSetErrorBuffer(cmd, errbuf);
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if (virCommandRun(cmd, NULL) < 0)
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return -1;
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return 0;
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}
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static int
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doRmmod(const char *module, char **errbuf)
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{
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g_autoptr(virCommand) cmd = NULL;
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cmd = virCommandNewArgList(RMMOD, module, NULL);
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virCommandSetErrorBuffer(cmd, errbuf);
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if (virCommandRun(cmd, NULL) < 0)
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return -1;
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return 0;
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}
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/**
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* virKModLoad:
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* @module: Name of the module to load
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*
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* Attempts to load a kernel module
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*
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* returns NULL in case of success and the error buffer output from the
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* virCommandRun() on failure. The returned buffer must be VIR_FREE()
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* by the caller
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*/
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char *
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virKModLoad(const char *module)
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{
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char *errbuf = NULL;
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if (doModprobe("-b", module, NULL, &errbuf) < 0)
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return errbuf;
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VIR_FREE(errbuf);
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return NULL;
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}
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/**
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* virKModUnload:
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* @module: Name of the module to unload
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*
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* Remove or unload a module.
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*
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* NB: Do not use 'modprobe -r' here as that code will recursively
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* unload any modules that were dependencies of the one being removed
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* even if things still require them. e.g. it'll see the 'bridge'
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* module has refcount of 0 and remove it, even if there are bridges
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* created on the host
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*
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* returns NULL in case of success and the error buffer output from the
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* virCommandRun() on failure. The returned buffer must be VIR_FREE()
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* by the caller
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*/
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char *
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virKModUnload(const char *module)
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{
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char *errbuf = NULL;
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if (doRmmod(module, &errbuf) < 0)
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return errbuf;
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VIR_FREE(errbuf);
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return NULL;
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}
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/**
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* virKModIsProhibited:
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* @module: Name of the module to check
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*
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* Determine if loading of @module is prohibited by admin
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* configuration.
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*
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* returns true when found prohibited, false otherwise.
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*/
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bool
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virKModIsProhibited(const char *module)
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{
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size_t i;
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g_autofree char *drvmatch = NULL;
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g_autofree char *outbuf = NULL;
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drvmatch = g_strdup_printf("blacklist %s\n", module);
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/* modprobe will convert all '-' into '_', so we need to as well */
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for (i = 0; i < drvmatch[i]; i++)
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if (drvmatch[i] == '-')
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drvmatch[i] = '_';
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if (doModprobe("-c", NULL, &outbuf, NULL) < 0)
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return false;
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if (strstr(outbuf, drvmatch))
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return true;
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return false;
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}
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