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util: replace TPM global variables with a struct array

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The virTPMEmulatorInit function defines a struct that gets filled with
pointers to global variables. It will be simpler to just use the struct
for the global variables directly.

Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-11-24 10:22:11 +00:00
parent e715648e8b
commit ac674429c3
1 changed files with 58 additions and 63 deletions
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119
src/util/virtpm.c
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@ -96,29 +96,52 @@ virTPMCreateCancelPath(const char *devpath)
* capabilities bitmap
*/
static virMutex swtpm_tools_lock = VIR_MUTEX_INITIALIZER;
static char *swtpm_path;
static struct stat swtpm_stat;
static virBitmap *swtpm_caps;
static char *swtpm_setup_path;
static struct stat swtpm_setup_stat;
static virBitmap *swtpm_setup_caps;
static char *swtpm_ioctl_path;
static struct stat swtpm_ioctl_stat;
typedef int (*virTPMBinaryCapsParse)(const char *);
typedef enum _virTPMBinary {
VIR_TPM_BINARY_SWTPM,
VIR_TPM_BINARY_SWTPM_SETUP,
VIR_TPM_BINARY_SWTPM_IOCTL,
VIR_TPM_BINARY_LAST
} virTPMBinary;
VIR_ENUM_DECL(virTPMBinary);
VIR_ENUM_IMPL(virTPMBinary,
VIR_TPM_BINARY_LAST,
"swtpm", "swtpm_setup", "swtpm_ioctl");
typedef struct _virTPMBinaryInfo {
char *path;
struct stat stat;
const char *parm;
virBitmap *caps;
virTPMBinaryCapsParse capsParse;
} virTPMBinaryInfo;
static virTPMBinaryInfo swtpmBinaries[VIR_TPM_BINARY_LAST] = {
[VIR_TPM_BINARY_SWTPM] = {
.parm = "socket",
.capsParse = virTPMSwtpmFeatureTypeFromString,
},
[VIR_TPM_BINARY_SWTPM_SETUP] = {
.capsParse = virTPMSwtpmSetupFeatureTypeFromString,
},
[VIR_TPM_BINARY_SWTPM_IOCTL] = {
},
};
static char *
virTPMBinaryGetPath(char **path_var)
virTPMBinaryGetPath(virTPMBinary binary)
{
char *s;
if (!*path_var && virTPMEmulatorInit() < 0)
if (!swtpmBinaries[binary].path && virTPMEmulatorInit() < 0)
return NULL;
virMutexLock(&swtpm_tools_lock);
s = g_strdup(*path_var);
s = g_strdup(swtpmBinaries[binary].path);
virMutexUnlock(&swtpm_tools_lock);
return s;
@ -127,19 +150,19 @@ virTPMBinaryGetPath(char **path_var)
char *
virTPMGetSwtpm(void)
{
return virTPMBinaryGetPath(&swtpm_path);
return virTPMBinaryGetPath(VIR_TPM_BINARY_SWTPM);
}
char *
virTPMGetSwtpmSetup(void)
{
return virTPMBinaryGetPath(&swtpm_setup_path);
return virTPMBinaryGetPath(VIR_TPM_BINARY_SWTPM_SETUP);
}
char *
virTPMGetSwtpmIoctl(void)
{
return virTPMBinaryGetPath(&swtpm_ioctl_path);
return virTPMBinaryGetPath(VIR_TPM_BINARY_SWTPM_IOCTL);
}
/* virTPMExecGetCaps
@ -245,62 +268,33 @@ int
virTPMEmulatorInit(void)
{
int ret = -1;
static const struct {
const char *name;
char **path;
struct stat *stat;
const char *parm;
virBitmap **caps;
virTPMBinaryCapsParse capsParse;
} prgs[] = {
{
.name = "swtpm",
.path = &swtpm_path,
.stat = &swtpm_stat,
.parm = "socket",
.caps = &swtpm_caps,
.capsParse = virTPMSwtpmFeatureTypeFromString,
},
{
.name = "swtpm_setup",
.path = &swtpm_setup_path,
.stat = &swtpm_setup_stat,
.caps = &swtpm_setup_caps,
.capsParse = virTPMSwtpmSetupFeatureTypeFromString,
},
{
.name = "swtpm_ioctl",
.path = &swtpm_ioctl_path,
.stat = &swtpm_ioctl_stat,
}
};
size_t i;
virMutexLock(&swtpm_tools_lock);
for (i = 0; i < G_N_ELEMENTS(prgs); i++) {
for (i = 0; i < VIR_TPM_BINARY_LAST; i++) {
g_autofree char *path = NULL;
bool findit = *prgs[i].path == NULL;
bool findit = swtpmBinaries[i].path == NULL;
struct stat statbuf;
if (!findit) {
/* has executables changed? */
if (stat(*prgs[i].path, &statbuf) < 0)
if (stat(swtpmBinaries[i].path, &statbuf) < 0)
findit = true;
if (!findit &&
statbuf.st_mtime != prgs[i].stat->st_mtime)
statbuf.st_mtime != swtpmBinaries[i].stat.st_mtime)
findit = true;
}
if (findit) {
VIR_FREE(*prgs[i].path);
VIR_FREE(swtpmBinaries[i].path);
path = virFindFileInPath(prgs[i].name);
path = virFindFileInPath(virTPMBinaryTypeToString(i));
if (!path) {
virReportSystemError(ENOENT,
_("Unable to find '%s' binary in $PATH"),
prgs[i].name);
virTPMBinaryTypeToString(i));
goto cleanup;
}
if (!virFileIsExecutable(path)) {
@ -309,17 +303,18 @@ virTPMEmulatorInit(void)
path);
goto cleanup;
}
if (stat(path, prgs[i].stat) < 0) {
if (stat(path, &swtpmBinaries[i].stat) < 0) {
virReportSystemError(errno,
_("Could not stat %s"), path);
goto cleanup;
}
*prgs[i].path = g_steal_pointer(&path);
swtpmBinaries[i].path = g_steal_pointer(&path);
if (prgs[i].caps) {
*prgs[i].caps = virTPMGetCaps(prgs[i].capsParse,
*prgs[i].path, prgs[i].parm);
if (!*prgs[i].caps)
if (swtpmBinaries[i].capsParse) {
swtpmBinaries[i].caps = virTPMGetCaps(swtpmBinaries[i].capsParse,
swtpmBinaries[i].path,
swtpmBinaries[i].parm);
if (!swtpmBinaries[i].caps)
goto cleanup;
}
}
@ -334,22 +329,22 @@ virTPMEmulatorInit(void)
}
static bool
virTPMBinaryGetCaps(virBitmap **caps_var,
virTPMBinaryGetCaps(virTPMBinary binary,
unsigned int cap)
{
if (virTPMEmulatorInit() < 0)
return false;
return virBitmapIsBitSet(*caps_var, cap);
return virBitmapIsBitSet(swtpmBinaries[binary].caps, cap);
}
bool
virTPMSwtpmCapsGet(unsigned int cap)
{
return virTPMBinaryGetCaps(&swtpm_caps, cap);
return virTPMBinaryGetCaps(VIR_TPM_BINARY_SWTPM, cap);
}
bool
virTPMSwtpmSetupCapsGet(unsigned int cap)
{
return virTPMBinaryGetCaps(&swtpm_setup_caps, cap);
return virTPMBinaryGetCaps(VIR_TPM_BINARY_SWTPM_SETUP, cap);
}