static int virNetSocketForkDaemon(const char *binary)
{
int ret;
virCommandPtr cmd = virCommandNewArgList(binary,
"--timeout=30",
NULL);
virCommandAddEnvPassCommon(cmd);
virCommandClearCaps(cmd);
virCommandDaemonize(cmd);
ret = virCommandRun(cmd, NULL);
virCommandFree(cmd);
return ret;
}
int
qemuCapsProbeCPUModels(const char *qemu,
virBitmapPtr qemuCaps,
const char *arch,
unsigned int *count,
const char ***cpus)
{
char *output = NULL;
int ret = -1;
qemuCapsParseCPUModels parse;
virCommandPtr cmd;
if (count)
*count = 0;
if (cpus)
*cpus = NULL;
if (STREQ(arch, "i686") || STREQ(arch, "x86_64"))
parse = qemuCapsParseX86Models;
else if (STREQ(arch, "ppc64"))
parse = qemuCapsParsePPCModels;
else {
VIR_DEBUG("don't know how to parse %s CPU models", arch);
return 0;
}
cmd = virCommandNewArgList(qemu, "-cpu", "?", NULL);
if (qemuCapsGet(qemuCaps, QEMU_CAPS_NODEFCONFIG))
virCommandAddArg(cmd, "-nodefconfig");
virCommandAddEnvPassCommon(cmd);
virCommandSetOutputBuffer(cmd, &output);
virCommandClearCaps(cmd);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (parse(output, count, cpus) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
int
qemuCapsProbeMachineTypes(const char *binary,
virCapsGuestMachinePtr **machines,
int *nmachines)
{
char *output;
int ret = -1;
virCommandPtr cmd;
int status;
/* Make sure the binary we are about to try exec'ing exists.
* Technically we could catch the exec() failure, but that's
* in a sub-process so it's hard to feed back a useful error.
*/
if (!virFileIsExecutable(binary)) {
virReportSystemError(errno, _("Cannot find QEMU binary %s"), binary);
return -1;
}
cmd = virCommandNewArgList(binary, "-M", "?", NULL);
virCommandAddEnvPassCommon(cmd);
virCommandSetOutputBuffer(cmd, &output);
virCommandClearCaps(cmd);
/* Ignore failure from older qemu that did not understand '-M ?'. */
if (virCommandRun(cmd, &status) < 0)
goto cleanup;
if (qemuCapsParseMachineTypesStr(output, machines, nmachines) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
/**
* qemuCreateInBridgePortWithHelper:
* @cfg: the configuration object in which the helper name is looked up
* @brname: the bridge name
* @ifname: the returned interface name
* @macaddr: the returned MAC address
* @tapfd: file descriptor return value for the new tap device
* @flags: OR of virNetDevTapCreateFlags:
* VIR_NETDEV_TAP_CREATE_VNET_HDR
* - Enable IFF_VNET_HDR on the tap device
*
* This function creates a new tap device on a bridge using an external
* helper. The final name for the bridge will be stored in @ifname.
*
* Returns 0 in case of success or -1 on failure
*/
static int
qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
const char *brname,
char **ifname,
int *tapfd,
unsigned int flags)
{
virCommandPtr cmd;
char *errbuf = NULL, *cmdstr = NULL;
int pair[2] = { -1, -1 };
if ((flags & ~VIR_NETDEV_TAP_CREATE_VNET_HDR) != VIR_NETDEV_TAP_CREATE_IFUP)
return -1;
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) < 0) {
virReportSystemError(errno, "%s", _("failed to create socket"));
return -1;
}
if (!virFileIsExecutable(cfg->bridgeHelperName)) {
virReportSystemError(errno, _("'%s' is not a suitable bridge helper"),
cfg->bridgeHelperName);
return -1;
}
cmd = virCommandNew(cfg->bridgeHelperName);
if (flags & VIR_NETDEV_TAP_CREATE_VNET_HDR)
virCommandAddArgFormat(cmd, "--use-vnet");
virCommandAddArgFormat(cmd, "--br=%s", brname);
virCommandAddArgFormat(cmd, "--fd=%d", pair[1]);
virCommandSetErrorBuffer(cmd, &errbuf);
virCommandDoAsyncIO(cmd);
virCommandPassFD(cmd, pair[1],
VIR_COMMAND_PASS_FD_CLOSE_PARENT);
virCommandClearCaps(cmd);
#ifdef CAP_NET_ADMIN
virCommandAllowCap(cmd, CAP_NET_ADMIN);
#endif
if (virCommandRunAsync(cmd, NULL) < 0) {
*tapfd = -1;
goto cleanup;
}
do {
*tapfd = recvfd(pair[0], 0);
} while (*tapfd < 0 && errno == EINTR);
if (*tapfd < 0) {
char ebuf[1024];
char *errstr = NULL;
if (!(cmdstr = virCommandToString(cmd)))
goto cleanup;
virCommandAbort(cmd);
if (errbuf && *errbuf &&
virAsprintf(&errstr, "\nstderr=%s", errbuf) < 0)
goto cleanup;
virReportError(VIR_ERR_INTERNAL_ERROR,
_("%s: failed to communicate with bridge helper: %s%s"),
cmdstr, virStrerror(errno, ebuf, sizeof(ebuf)),
errstr ? errstr : "");
VIR_FREE(errstr);
goto cleanup;
}
if (virNetDevTapGetName(*tapfd, ifname) < 0 ||
virCommandWait(cmd, NULL) < 0) {
VIR_FORCE_CLOSE(*tapfd);
*tapfd = -1;
}
cleanup:
VIR_FREE(cmdstr);
VIR_FREE(errbuf);
virCommandFree(cmd);
VIR_FORCE_CLOSE(pair[0]);
return *tapfd < 0 ? -1 : 0;
}
static int
dnsmasqCapsRefreshInternal(dnsmasqCapsPtr caps, bool force)
{
int ret = -1;
struct stat sb;
virCommandPtr cmd = NULL;
char *help = NULL, *version = NULL, *complete = NULL;
if (!caps || caps->noRefresh)
return 0;
if (stat(caps->binaryPath, &sb) < 0) {
virReportSystemError(errno, _("Cannot check dnsmasq binary %s"),
caps->binaryPath);
return -1;
}
if (!force && caps->mtime == sb.st_mtime)
return 0;
caps->mtime = sb.st_mtime;
/* Make sure the binary we are about to try exec'ing exists.
* Technically we could catch the exec() failure, but that's
* in a sub-process so it's hard to feed back a useful error.
*/
if (!virFileIsExecutable(caps->binaryPath)) {
virReportSystemError(errno, _("dnsmasq binary %s is not executable"),
caps->binaryPath);
goto cleanup;
}
cmd = virCommandNewArgList(caps->binaryPath, "--version", NULL);
virCommandSetOutputBuffer(cmd, &version);
virCommandAddEnvPassCommon(cmd);
virCommandClearCaps(cmd);
if (virCommandRun(cmd, NULL) < 0) {
virReportSystemError(errno, _("failed to run '%s --version': %s"),
caps->binaryPath, version);
goto cleanup;
}
virCommandFree(cmd);
cmd = virCommandNewArgList(caps->binaryPath, "--help", NULL);
virCommandSetOutputBuffer(cmd, &help);
virCommandAddEnvPassCommon(cmd);
virCommandClearCaps(cmd);
if (virCommandRun(cmd, NULL) < 0) {
virReportSystemError(errno, _("failed to run '%s --help': %s"),
caps->binaryPath, help);
goto cleanup;
}
if (virAsprintf(&complete, "%s\n%s", version, help) < 0)
goto cleanup;
ret = dnsmasqCapsSetFromBuffer(caps, complete);
cleanup:
virCommandFree(cmd);
VIR_FREE(help);
VIR_FREE(version);
VIR_FREE(complete);
return ret;
}
/*
* qemuTPMEmulatorBuildCommand:
*
* @tpm: TPM definition
* @vmname: The name of the VM
* @vmuuid: The UUID of the VM
* @privileged: whether we are running in privileged mode
* @swtpm_user: The uid for the swtpm to run as (drop privileges to from root)
* @swtpm_group: The gid for the swtpm to run as
* @swtpmStateDir: the directory where swtpm writes the pid file and creates the
* Unix socket
* @shortName: the short name of the VM
*
* Create the virCommand use for starting the emulator
* Do some initializations on the way, such as creation of storage
* and emulator setup.
*/
static virCommandPtr
qemuTPMEmulatorBuildCommand(virDomainTPMDefPtr tpm,
const char *vmname,
const unsigned char *vmuuid,
bool privileged,
uid_t swtpm_user,
gid_t swtpm_group,
const char *swtpmStateDir,
const char *shortName)
{
virCommandPtr cmd = NULL;
bool created = false;
char *pidfile;
if (qemuTPMCreateEmulatorStorage(tpm->data.emulator.storagepath,
&created, swtpm_user, swtpm_group) < 0)
return NULL;
if (created &&
qemuTPMEmulatorRunSetup(tpm->data.emulator.storagepath, vmname, vmuuid,
privileged, swtpm_user, swtpm_group,
tpm->data.emulator.logfile, tpm->version) < 0)
goto error;
unlink(tpm->data.emulator.source.data.nix.path);
cmd = virCommandNew(swtpm_path);
if (!cmd)
goto error;
virCommandClearCaps(cmd);
virCommandAddArgList(cmd, "socket", "--daemon", "--ctrl", NULL);
virCommandAddArgFormat(cmd, "type=unixio,path=%s,mode=0600",
tpm->data.emulator.source.data.nix.path);
virCommandAddArg(cmd, "--tpmstate");
virCommandAddArgFormat(cmd, "dir=%s,mode=0600",
tpm->data.emulator.storagepath);
virCommandAddArg(cmd, "--log");
virCommandAddArgFormat(cmd, "file=%s", tpm->data.emulator.logfile);
virCommandSetUID(cmd, swtpm_user);
virCommandSetGID(cmd, swtpm_group);
switch (tpm->version) {
case VIR_DOMAIN_TPM_VERSION_1_2:
break;
case VIR_DOMAIN_TPM_VERSION_2_0:
virCommandAddArg(cmd, "--tpm2");
break;
case VIR_DOMAIN_TPM_VERSION_DEFAULT:
case VIR_DOMAIN_TPM_VERSION_LAST:
break;
}
if (!(pidfile = qemuTPMEmulatorCreatePidFilename(swtpmStateDir, shortName)))
goto error;
virCommandAddArg(cmd, "--pid");
virCommandAddArgFormat(cmd, "file=%s", pidfile);
VIR_FREE(pidfile);
return cmd;
error:
if (created)
qemuTPMDeleteEmulatorStorage(tpm);
virCommandFree(cmd);
return NULL;
}
/*
* qemuTPMEmulatorRunSetup
*
* @storagepath: path to the directory for TPM state
* @vmname: the name of the VM
* @vmuuid: the UUID of the VM
* @privileged: whether we are running in privileged mode
* @swtpm_user: The userid to switch to when setting up the TPM;
* typically this should be the uid of 'tss' or 'root'
* @swtpm_group: The group id to switch to
* @logfile: The file to write the log into; it must be writable
* for the user given by userid or 'tss'
* @tpmversion: The version of the TPM, either a TPM 1.2 or TPM 2
*
* Setup the external swtpm by creating endorsement key and
* certificates for it.
*/
static int
qemuTPMEmulatorRunSetup(const char *storagepath,
const char *vmname,
const unsigned char *vmuuid,
bool privileged,
uid_t swtpm_user,
gid_t swtpm_group,
const char *logfile,
const virDomainTPMVersion tpmversion)
{
virCommandPtr cmd = NULL;
int exitstatus;
int ret = -1;
char uuid[VIR_UUID_STRING_BUFLEN];
char *vmid = NULL;
if (!privileged && tpmversion == VIR_DOMAIN_TPM_VERSION_1_2)
return virFileWriteStr(logfile,
_("Did not create EK and certificates since "
"this requires privileged mode for a "
"TPM 1.2\n"), 0600);
cmd = virCommandNew(swtpm_setup);
if (!cmd)
goto cleanup;
virUUIDFormat(vmuuid, uuid);
if (virAsprintf(&vmid, "%s:%s", vmname, uuid) < 0)
goto cleanup;
virCommandSetUID(cmd, swtpm_user);
virCommandSetGID(cmd, swtpm_group);
switch (tpmversion) {
case VIR_DOMAIN_TPM_VERSION_1_2:
break;
case VIR_DOMAIN_TPM_VERSION_2_0:
virCommandAddArgList(cmd, "--tpm2", NULL);
break;
case VIR_DOMAIN_TPM_VERSION_DEFAULT:
case VIR_DOMAIN_TPM_VERSION_LAST:
break;
}
virCommandAddArgList(cmd,
"--tpm-state", storagepath,
"--vmid", vmid,
"--logfile", logfile,
"--createek",
"--create-ek-cert",
"--create-platform-cert",
"--lock-nvram",
"--not-overwrite",
NULL);
virCommandClearCaps(cmd);
if (virCommandRun(cmd, &exitstatus) < 0 || exitstatus != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Could not run '%s'. exitstatus: %d; "
"Check error log '%s' for details."),
swtpm_setup, exitstatus, logfile);
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(vmid);
virCommandFree(cmd);
return ret;
}
