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libvirt/tools/vsh.c
Michal Privoznik 79c613ec8a virsh: fflush(stdout) after fputs() 
We are not guaranteed that the string we are printing onto stdout
contains '\n' and thus that the stdout is flushed. In fact, I've
met this problem when virsh asked me whether I want to edit the
domain XML again (vshAskReedit()) but the prompt wasn't displayed
(as it does not contain a newline character) and virsh just sat
there waiting for my input, I sat there waiting for virsh's
output. Flush stdout after all fputs()-s  which do not flush
stdout.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2022-03-10 08:57:31 +01:00

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/*
* vsh.c: common data to be used by clients to exercise the libvirt API
*
* Copyright (C) 2005-2019 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 "vsh.h"
#include <assert.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <inttypes.h>
#include <signal.h>
#if WITH_READLINE
/* In order to have proper rl_message declaration with older
* versions of readline, we have to declare this. See 9ea3424a178
* for more info. */
# define HAVE_STDARG_H
# include <readline/readline.h>
# include <readline/history.h>
#endif
#include "internal.h"
#include "virbuffer.h"
#include "viralloc.h"
#include "virfile.h"
#include "virthread.h"
#include "vircommand.h"
#include "virstring.h"
#include "virutil.h"
#ifdef WITH_READLINE
/* For autocompletion */
vshControl *autoCompleteOpaque;
#endif
/* NOTE: It would be much nicer to have these two as part of vshControl
* structure, unfortunately readline doesn't support passing opaque data
* and only relies on static data accessible from the user-side callback
*/
const vshCmdGrp *cmdGroups;
const vshCmdDef *cmdSet;
double
vshPrettyCapacity(unsigned long long val, const char **unit)
{
double limit = 1024;
if (val < limit) {
*unit = "B";
return val;
}
limit *= 1024;
if (val < limit) {
*unit = "KiB";
return val / (limit / 1024);
}
limit *= 1024;
if (val < limit) {
*unit = "MiB";
return val / (limit / 1024);
}
limit *= 1024;
if (val < limit) {
*unit = "GiB";
return val / (limit / 1024);
}
limit *= 1024;
if (val < limit) {
*unit = "TiB";
return val / (limit / 1024);
}
limit *= 1024;
if (val < limit) {
*unit = "PiB";
return val / (limit / 1024);
}
limit *= 1024;
*unit = "EiB";
return val / (limit / 1024);
}
int
vshNameSorter(const void *a, const void *b)
{
const char **sa = (const char**)a;
const char **sb = (const char**)b;
return vshStrcasecmp(*sa, *sb);
}
/*
* Convert the strings separated by ',' into array. The returned
* array is a NULL terminated string list. The caller has to free
* the array using g_strfreev or a similar method.
*
* Returns the length of the filled array on success, or -1
* on error.
*/
int
vshStringToArray(const char *str,
char ***array)
{
g_auto(GStrv) tmp = NULL;
GStrv n;
size_t ntoks = 0;
bool concat = false;
tmp = g_strsplit(str, ",", 0);
*array = g_new0(char *, g_strv_length(tmp) + 1);
(*array)[ntoks++] = g_strdup(tmp[0]);
/* undo splitting of comma escape (',,') by concatenating back on empty strings */
for (n = tmp + 1; n[0]; n++) {
if (concat) {
g_autofree char *old = (*array)[ntoks - 1];
(*array)[ntoks - 1] = g_strconcat(old, ",", n[0], NULL);
concat = false;
continue;
}
if (strlen(n[0]) == 0) {
concat = true;
} else {
(*array)[ntoks++] = g_strdup(n[0]);
}
}
/* corner case of ending with a single comma */
if (concat)
(*array)[ntoks++] = g_strdup("");
return ntoks;
}
virErrorPtr last_error;
/*
* Quieten libvirt until we're done with the command.
*/
void
vshErrorHandler(void *opaque G_GNUC_UNUSED,
virErrorPtr error G_GNUC_UNUSED)
{
virFreeError(last_error);
last_error = virSaveLastError();
}
/* Store a libvirt error that is from a helper API that doesn't raise errors
* so it doesn't get overwritten */
void
vshSaveLibvirtError(void)
{
virFreeError(last_error);
last_error = virSaveLastError();
}
/* Store libvirt error from helper API but don't overwrite existing errors */
void
vshSaveLibvirtHelperError(void)
{
if (last_error)
return;
if (virGetLastErrorCode() == VIR_ERR_OK)
return;
vshSaveLibvirtError();
}
/*
* Reset libvirt error on graceful fallback paths
*/
void
vshResetLibvirtError(void)
{
g_clear_pointer(&last_error, virFreeError);
virResetLastError();
}
/*
* Report an error when a command finishes. This is better than before
* (when correct operation would report errors), but it has some
* problems: we lose the smarter formatting of virDefaultErrorFunc(),
* and it can become harder to debug problems, if errors get reported
* twice during one command. This case shouldn't really happen anyway,
* and it's IMHO a bug that libvirt does that sometimes.
*/
void
vshReportError(vshControl *ctl)
{
if (last_error == NULL) {
/* Calling directly into libvirt util functions won't trigger the
* error callback (which sets last_error), so check it ourselves.
*
* If the returned error has CODE_OK, this most likely means that
* no error was ever raised, so just ignore */
last_error = virSaveLastError();
if (!last_error || last_error->code == VIR_ERR_OK)
goto out;
}
if (last_error->code == VIR_ERR_OK) {
vshError(ctl, "%s", _("unknown error"));
goto out;
}
vshError(ctl, "%s", last_error->message);
out:
vshResetLibvirtError();
}
/*
* Detection of disconnections and automatic reconnection support
*/
static int disconnected; /* we may have been disconnected */
/* ---------------
* Utils for work with command definition
* ---------------
*/
const char *
vshCmddefGetInfo(const vshCmdDef * cmd, const char *name)
{
const vshCmdInfo *info;
for (info = cmd->info; info && info->name; info++) {
if (STREQ(info->name, name))
return info->data;
}
return NULL;
}
/* Check if the internal command definitions are correct */
static int
vshCmddefCheckInternals(vshControl *ctl,
const vshCmdDef *cmd,
bool missingCompleters)
{
size_t i;
const char *help = NULL;
bool seenOptionalOption = false;
g_auto(virBuffer) complbuf = VIR_BUFFER_INITIALIZER;
/* in order to perform the validation resolve the alias first */
if (cmd->flags & VSH_CMD_FLAG_ALIAS) {
const vshCmdDef *alias;
if (!cmd->alias) {
vshError(ctl, _("command '%s' has inconsistent alias"), cmd->name);
return -1;
}
if (!(alias = vshCmddefSearch(cmd->alias))) {
vshError(ctl, _("command alias '%s' is pointing to a non-existent command '%s'"),
cmd->name, cmd->alias);
return -1;
}
if (alias->flags & VSH_CMD_FLAG_ALIAS) {
vshError(ctl, _("command alias '%s' is pointing to another command alias '%s'"),
cmd->name, cmd->alias);
return -1;
}
if (cmd->handler) {
vshError(ctl, _("command '%s' has handler set"), cmd->name);
return -1;
}
if (cmd->opts) {
vshError(ctl, _("command '%s' has options set"), cmd->name);
return -1;
}
if (cmd->info) {
vshError(ctl, _("command '%s' has info set"), cmd->name);
return -1;
}
if (cmd->flags & ~VSH_CMD_FLAG_ALIAS) {
vshError(ctl, _("command '%s' has multiple flags set"), cmd->name);
return -1;
}
/* we don't need to continue as the real command will be checked separately */
return 0;
}
/* Each command has to provide a non-empty help string. */
if (!(help = vshCmddefGetInfo(cmd, "help")) || !*help) {
vshError(ctl, _("command '%s' lacks help"), cmd->name);
return -1;
}
if (!cmd->opts)
return 0;
for (i = 0; cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (i > 63) {
vshError(ctl, _("command '%s' has too many options"), cmd->name);
return -1; /* too many options */
}
if (missingCompleters &&
(opt->type == VSH_OT_STRING || opt->type == VSH_OT_DATA) &&
!opt->completer)
virBufferStrcat(&complbuf, opt->name, ", ", NULL);
switch (opt->type) {
case VSH_OT_BOOL:
if (opt->completer || opt->completer_flags) {
vshError(ctl, _("bool parameter '%s' of command '%s' has completer set"),
opt->name, cmd->name);
return -1;
}
G_GNUC_FALLTHROUGH;
case VSH_OT_STRING:
if (opt->flags & VSH_OFLAG_REQ) {
vshError(ctl, _("parameter '%s' of command '%s' misused VSH_OFLAG_REQ"),
opt->name, cmd->name);
return -1; /* neither bool nor string options can be mandatory */
}
seenOptionalOption = true;
break;
case VSH_OT_ALIAS: {
size_t j;
g_autofree char *name = NULL;
char *p;
if (opt->flags || !opt->help) {
vshError(ctl, _("parameter '%s' of command '%s' has incorrect alias option"),
opt->name, cmd->name);
return -1; /* alias options are tracked by the original name */
}
if ((p = strchr(opt->help, '=')))
name = g_strndup(opt->help, p - opt->help);
else
name = g_strdup(opt->help);
for (j = i + 1; cmd->opts[j].name; j++) {
if (STREQ(name, cmd->opts[j].name) &&
cmd->opts[j].type != VSH_OT_ALIAS)
break;
}
if (p) {
/* If alias comes with value, replacement must not be bool */
if (cmd->opts[j].type == VSH_OT_BOOL) {
vshError(ctl, _("alias '%s' of command '%s' has mismatched alias type"),
opt->name, cmd->name);
return -1;
}
}
if (!cmd->opts[j].name) {
vshError(ctl, _("alias '%s' of command '%s' has missing alias option"),
opt->name, cmd->name);
return -1; /* alias option must map to a later option name */
}
}
break;
case VSH_OT_ARGV:
if (cmd->opts[i + 1].name) {
vshError(ctl, _("parameter '%s' of command '%s' must be listed last"),
opt->name, cmd->name);
return -1; /* argv option must be listed last */
}
break;
case VSH_OT_DATA:
if (!(opt->flags & VSH_OFLAG_REQ)) {
vshError(ctl, _("parameter '%s' of command '%s' must use VSH_OFLAG_REQ flag"),
opt->name, cmd->name);
return -1; /* OT_DATA should always be required. */
}
if (seenOptionalOption) {
vshError(ctl, _("parameter '%s' of command '%s' must be listed before optional parameters"),
opt->name, cmd->name);
return -1; /* mandatory options must be listed first */
}
break;
case VSH_OT_INT:
if (opt->flags & VSH_OFLAG_REQ) {
if (seenOptionalOption) {
vshError(ctl, _("parameter '%s' of command '%s' must be listed before optional parameters"),
opt->name, cmd->name);
return -1; /* mandatory options must be listed first */
}
} else {
seenOptionalOption = true;
}
break;
}
}
virBufferTrim(&complbuf, ", ");
if (missingCompleters && virBufferUse(&complbuf) > 0)
vshPrintExtra(ctl, "%s: %s\n", cmd->name, virBufferCurrentContent(&complbuf));
return 0;
}
/* Parse the options associated with @cmd, i.e. test whether options are
* required or need an argument and fill the appropriate caller-provided bitmaps
*/
static void
vshCmddefOptParse(const vshCmdDef *cmd,
uint64_t *opts_need_arg,
uint64_t *opts_required)
{
size_t i;
*opts_need_arg = 0;
*opts_required = 0;
if (!cmd->opts)
return;
for (i = 0; cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (opt->type == VSH_OT_BOOL)
continue;
if (opt->type == VSH_OT_ALIAS)
continue; /* skip the alias option */
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
*opts_need_arg |= 1ULL << i;
if (opt->flags & VSH_OFLAG_REQ)
*opts_required |= 1ULL << i;
}
}
static vshCmdOptDef helpopt = {
.name = "help",
.type = VSH_OT_BOOL,
.help = N_("print help for this function")
};
static const vshCmdOptDef *
vshCmddefGetOption(vshControl *ctl, const vshCmdDef *cmd, const char *name,
uint64_t *opts_seen, size_t *opt_index, char **optstr,
bool report)
{
size_t i;
g_autofree char *alias = NULL;
if (STREQ(name, helpopt.name))
return &helpopt;
for (i = 0; cmd->opts && cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (STREQ(opt->name, name)) {
if (opt->type == VSH_OT_ALIAS) {
char *value;
/* Two types of replacements:
opt->help = "string": straight replacement of name
opt->help = "string=value": treat boolean flag as
alias of option and its default value */
alias = g_strdup(opt->help);
name = alias;
if ((value = strchr(name, '='))) {
*value = '\0';
if (*optstr) {
if (report)
vshError(ctl, _("invalid '=' after option --%s"),
opt->name);
return NULL;
}
*optstr = g_strdup(value + 1);
}
continue;
}
if ((*opts_seen & (1ULL << i)) && opt->type != VSH_OT_ARGV) {
if (report)
vshError(ctl, _("option --%s already seen"), name);
return NULL;
}
*opts_seen |= 1ULL << i;
*opt_index = i;
return opt;
}
}
if (STRNEQ(cmd->name, "help") && report) {
vshError(ctl, _("command '%s' doesn't support option --%s"),
cmd->name, name);
}
return NULL;
}
static const vshCmdOptDef *
vshCmddefGetData(const vshCmdDef *cmd, uint64_t *opts_need_arg,
uint64_t *opts_seen)
{
size_t i;
const vshCmdOptDef *opt;
if (!*opts_need_arg)
return NULL;
/* Grab least-significant set bit */
i = __builtin_ffsl(*opts_need_arg) - 1;
opt = &cmd->opts[i];
if (opt->type != VSH_OT_ARGV)
*opts_need_arg &= ~(1ULL << i);
*opts_seen |= 1ULL << i;
return opt;
}
/*
* Checks for required options
*/
static int
vshCommandCheckOpts(vshControl *ctl, const vshCmd *cmd, uint64_t opts_required,
uint64_t opts_seen)
{
const vshCmdDef *def = cmd->def;
size_t i;
opts_required &= ~opts_seen;
if (!opts_required)
return 0;
for (i = 0; def->opts[i].name; i++) {
if (opts_required & (1ULL << i)) {
const vshCmdOptDef *opt = &def->opts[i];
vshError(ctl,
opt->type == VSH_OT_DATA || opt->type == VSH_OT_ARGV ?
_("command '%s' requires <%s> option") :
_("command '%s' requires --%s option"),
def->name, opt->name);
}
}
return -1;
}
static const vshCmdDef *
vshCmdDefSearchGrp(const char *cmdname)
{
const vshCmdGrp *g;
const vshCmdDef *c;
for (g = cmdGroups; g->name; g++) {
for (c = g->commands; c->name; c++) {
if (STREQ(c->name, cmdname))
return c;
}
}
return NULL;
}
static const vshCmdDef *
vshCmdDefSearchSet(const char *cmdname)
{
const vshCmdDef *s;
for (s = cmdSet; s->name; s++) {
if (STREQ(s->name, cmdname))
return s;
}
return NULL;
}
const vshCmdDef *
vshCmddefSearch(const char *cmdname)
{
if (cmdGroups)
return vshCmdDefSearchGrp(cmdname);
else
return vshCmdDefSearchSet(cmdname);
}
const vshCmdGrp *
vshCmdGrpSearch(const char *grpname)
{
const vshCmdGrp *g;
for (g = cmdGroups; g->name; g++) {
if (STREQ(g->name, grpname) || STREQ(g->keyword, grpname))
return g;
}
return NULL;
}
bool
vshCmdGrpHelp(vshControl *ctl, const vshCmdGrp *grp)
{
const vshCmdDef *cmd = NULL;
vshPrint(ctl, _(" %s (help keyword '%s'):\n"), grp->name,
grp->keyword);
for (cmd = grp->commands; cmd->name; cmd++) {
if (cmd->flags & VSH_CMD_FLAG_ALIAS ||
cmd->flags & VSH_CMD_FLAG_HIDDEN)
continue;
vshPrint(ctl, " %-30s %s\n", cmd->name,
_(vshCmddefGetInfo(cmd, "help")));
}
return true;
}
static bool
vshCmddefHelp(const vshCmdDef *def)
{
const char *desc = NULL;
char buf[256];
bool shortopt = false; /* true if 'arg' works instead of '--opt arg' */
fputs(_(" NAME\n"), stdout);
fprintf(stdout, " %s - %s\n", def->name,
_(vshCmddefGetInfo(def, "help")));
fputs(_("\n SYNOPSIS\n"), stdout);
fprintf(stdout, " %s", def->name);
if (def->opts) {
const vshCmdOptDef *opt;
for (opt = def->opts; opt->name; opt++) {
const char *fmt = "%s";
switch (opt->type) {
case VSH_OT_BOOL:
fmt = "[--%s]";
break;
case VSH_OT_INT:
/* xgettext:c-format */
fmt = ((opt->flags & VSH_OFLAG_REQ) ? "<%s>"
: _("[--%s <number>]"));
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
shortopt = true;
break;
case VSH_OT_STRING:
/* xgettext:c-format */
fmt = _("[--%s <string>]");
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
shortopt = true;
break;
case VSH_OT_DATA:
fmt = ((opt->flags & VSH_OFLAG_REQ) ? "<%s>" : "[<%s>]");
if (!(opt->flags & VSH_OFLAG_REQ_OPT))
shortopt = true;
break;
case VSH_OT_ARGV:
/* xgettext:c-format */
if (shortopt) {
fmt = (opt->flags & VSH_OFLAG_REQ)
? _("{[--%s] <string>}...")
: _("[[--%s] <string>]...");
} else {
fmt = (opt->flags & VSH_OFLAG_REQ) ? _("<%s>...")
: _("[<%s>]...");
}
break;
case VSH_OT_ALIAS:
/* aliases are intentionally undocumented */
continue;
}
fputc(' ', stdout);
fprintf(stdout, fmt, opt->name);
}
}
fputc('\n', stdout);
desc = vshCmddefGetInfo(def, "desc");
if (desc && *desc) {
/* Print the description only if it's not empty. */
fputs(_("\n DESCRIPTION\n"), stdout);
fprintf(stdout, " %s\n", _(desc));
}
if (def->opts && def->opts->name) {
const vshCmdOptDef *opt;
fputs(_("\n OPTIONS\n"), stdout);
for (opt = def->opts; opt->name; opt++) {
switch (opt->type) {
case VSH_OT_BOOL:
g_snprintf(buf, sizeof(buf), "--%s", opt->name);
break;
case VSH_OT_INT:
g_snprintf(buf, sizeof(buf),
(opt->flags & VSH_OFLAG_REQ) ? _("[--%s] <number>")
: _("--%s <number>"), opt->name);
break;
case VSH_OT_STRING:
g_snprintf(buf, sizeof(buf), _("--%s <string>"), opt->name);
break;
case VSH_OT_DATA:
g_snprintf(buf, sizeof(buf), _("[--%s] <string>"),
opt->name);
break;
case VSH_OT_ARGV:
g_snprintf(buf, sizeof(buf),
shortopt ? _("[--%s] <string>") : _("<%s>"),
opt->name);
break;
case VSH_OT_ALIAS:
continue;
}
fprintf(stdout, " %-15s %s\n", buf, _(opt->help));
}
}
fputc('\n', stdout);
return true;
}
/* ---------------
* Utils for work with runtime commands data
* ---------------
*/
static void
vshCommandOptFree(vshCmdOpt * arg)
{
vshCmdOpt *a = arg;
while (a) {
vshCmdOpt *tmp = a;
a = a->next;
g_free(tmp->data);
g_free(tmp);
}
}
static void
vshCommandFree(vshCmd *cmd)
{
vshCmd *c = cmd;
while (c) {
vshCmd *tmp = c;
c = c->next;
vshCommandOptFree(tmp->opts);
g_free(tmp);
}
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC(vshCmd, vshCommandFree);
/**
* vshCommandOpt:
* @cmd: parsed command line to search
* @name: option name to search for
* @opt: result of the search
* @needData: true if option must be non-boolean
*
* Look up an option passed to CMD by NAME. Returns 1 with *OPT set
* to the option if found, 0 with *OPT set to NULL if the name is
* valid and the option is not required, -1 with *OPT set to NULL if
* the option is required but not present, and assert if NAME is not
* valid (which indicates a programming error) unless cmd->skipChecks
* is set. No error messages are issued if a value is returned.
*/
static int
vshCommandOpt(const vshCmd *cmd, const char *name, vshCmdOpt **opt,
bool needData)
{
vshCmdOpt *candidate = cmd->opts;
const vshCmdOptDef *valid = cmd->def->opts;
int ret = 0;
/* See if option is valid and/or required. */
*opt = NULL;
while (valid && valid->name) {
if (STREQ(name, valid->name))
break;
valid++;
}
if (!cmd->skipChecks)
assert(valid && (!needData || valid->type != VSH_OT_BOOL));
if (valid && valid->flags & VSH_OFLAG_REQ)
ret = -1;
/* See if option is present on command line. */
while (candidate) {
if (STREQ(candidate->def->name, name)) {
*opt = candidate;
ret = 1;
break;
}
candidate = candidate->next;
}
return ret;
}
/**
* vshCommandOptInt:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Convert option to int.
* On error, a message is displayed.
*
* Return value:
* >0 if option found and valid (@value updated)
* 0 if option not found and not required (@value untouched)
* <0 in all other cases (@value untouched)
*/
int
vshCommandOptInt(vshControl *ctl, const vshCmd *cmd,
const char *name, int *value)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if ((ret = virStrToLong_i(arg->data, NULL, 10, value)) < 0)
vshError(ctl,
_("Numeric value '%s' for <%s> option is malformed or out of range"),
arg->data, name);
else
ret = 1;
return ret;
}
static int
vshCommandOptUIntInternal(vshControl *ctl,
const vshCmd *cmd,
const char *name,
unsigned int *value,
bool wrap)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (wrap)
ret = virStrToLong_ui(arg->data, NULL, 10, value);
else
ret = virStrToLong_uip(arg->data, NULL, 10, value);
if (ret < 0)
vshError(ctl,
_("Numeric value '%s' for <%s> option is malformed or out of range"),
arg->data, name);
else
ret = 1;
return ret;
}
/**
* vshCommandOptUInt:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned int, reject negative numbers
* See vshCommandOptInt()
*/
int
vshCommandOptUInt(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned int *value)
{
return vshCommandOptUIntInternal(ctl, cmd, name, value, false);
}
/**
* vshCommandOptUIntWrap:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned int, wraps negative numbers to positive
* See vshCommandOptInt()
*/
int
vshCommandOptUIntWrap(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned int *value)
{
return vshCommandOptUIntInternal(ctl, cmd, name, value, true);
}
static int
vshCommandOptULInternal(vshControl *ctl,
const vshCmd *cmd,
const char *name,
unsigned long *value,
bool wrap)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (wrap)
ret = virStrToLong_ul(arg->data, NULL, 10, value);
else
ret = virStrToLong_ulp(arg->data, NULL, 10, value);
if (ret < 0)
vshError(ctl,
_("Numeric value '%s' for <%s> option is malformed or out of range"),
arg->data, name);
else
ret = 1;
return ret;
}
/*
* vshCommandOptUL:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned long
* See vshCommandOptInt()
*/
int
vshCommandOptUL(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long *value)
{
return vshCommandOptULInternal(ctl, cmd, name, value, false);
}
/**
* vshCommandOptULWrap:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Convert option to unsigned long, wraps negative numbers to positive
* See vshCommandOptInt()
*/
int
vshCommandOptULWrap(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long *value)
{
return vshCommandOptULInternal(ctl, cmd, name, value, true);
}
/**
* vshCommandOptStringQuiet:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Returns option as STRING. On error -1 is returned but no error is set.
* Return value:
* >0 if option found and valid (@value updated)
* 0 if option not found and not required (@value untouched)
* <0 in all other cases (@value untouched)
*/
int
vshCommandOptStringQuiet(vshControl *ctl G_GNUC_UNUSED, const vshCmd *cmd,
const char *name, const char **value)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (!*arg->data && !(arg->def->flags & VSH_OFLAG_EMPTY_OK))
return -1;
*value = arg->data;
return 1;
}
/**
* vshCommandOptStringReq:
* @ctl virtshell control structure
* @cmd command structure
* @name option name
* @value result (updated to NULL or the option argument)
*
* Gets a option argument as string.
*
* Returns 0 on success or when the option is not present and not
* required, *value is set to the option argument. On error -1 is
* returned and error message printed.
*/
int
vshCommandOptStringReq(vshControl *ctl,
const vshCmd *cmd,
const char *name,
const char **value)
{
vshCmdOpt *arg;
int ret;
const char *error = NULL;
/* clear out the value */
*value = NULL;
ret = vshCommandOpt(cmd, name, &arg, true);
/* option is not required and not present */
if (ret == 0)
return 0;
/* this should not be propagated here, just to be sure */
if (ret == -1)
error = N_("Mandatory option not present");
else if (arg && !*arg->data && !(arg->def->flags & VSH_OFLAG_EMPTY_OK))
error = N_("Option argument is empty");
if (error) {
if (!cmd->skipChecks)
vshError(ctl, _("Failed to get option '%s': %s"), name, _(error));
return -1;
}
*value = arg->data;
return 0;
}
/**
* vshCommandOptLongLong:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Returns option as long long
* See vshCommandOptInt()
*/
int
vshCommandOptLongLong(vshControl *ctl, const vshCmd *cmd,
const char *name, long long *value)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if ((ret = virStrToLong_ll(arg->data, NULL, 10, value)) < 0)
vshError(ctl,
_("Numeric value '%s' for <%s> option is malformed or out of range"),
arg->data, name);
else
ret = 1;
return ret;
}
static int
vshCommandOptULongLongInternal(vshControl *ctl,
const vshCmd *cmd,
const char *name,
unsigned long long *value,
bool wrap)
{
vshCmdOpt *arg;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (wrap)
ret = virStrToLong_ull(arg->data, NULL, 10, value);
else
ret = virStrToLong_ullp(arg->data, NULL, 10, value);
if (ret < 0)
vshError(ctl,
_("Numeric value '%s' for <%s> option is malformed or out of range"),
arg->data, name);
else
ret = 1;
return ret;
}
/**
* vshCommandOptULongLong:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Returns option as long long, rejects negative numbers
* See vshCommandOptInt()
*/
int
vshCommandOptULongLong(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long long *value)
{
return vshCommandOptULongLongInternal(ctl, cmd, name, value, false);
}
/**
* vshCommandOptULongLongWrap:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
*
* Returns option as long long, wraps negative numbers to positive
* See vshCommandOptInt()
*/
int
vshCommandOptULongLongWrap(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long long *value)
{
return vshCommandOptULongLongInternal(ctl, cmd, name, value, true);
}
/**
* vshCommandOptScaledInt:
* @ctl virtshell control structure
* @cmd command reference
* @name option name
* @value result
* @scale default of 1 or 1024, if no suffix is present
* @max maximum value permitted
*
* Returns option as long long, scaled according to suffix
* See vshCommandOptInt()
*/
int
vshCommandOptScaledInt(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long long *value,
int scale, unsigned long long max)
{
vshCmdOpt *arg;
char *end;
int ret;
if ((ret = vshCommandOpt(cmd, name, &arg, true)) <= 0)
return ret;
if (virStrToLong_ullp(arg->data, &end, 10, value) < 0 ||
virScaleInteger(value, end, scale, max) < 0) {
vshError(ctl,
_("Scaled numeric value '%s' for <%s> option is malformed or "
"out of range"), arg->data, name);
return -1;
}
return 1;
}
/**
* vshCommandOptBool:
* @cmd command reference
* @name option name
*
* Returns true/false if the option exists. Note that this does NOT
* validate whether the option is actually boolean, or even whether
* name is legal; so that this can be used to probe whether a data
* option is present without actually using that data.
*/
bool
vshCommandOptBool(const vshCmd *cmd, const char *name)
{
vshCmdOpt *dummy;
return vshCommandOpt(cmd, name, &dummy, false) == 1;
}
/**
* vshCommandOptArgv:
* @ctl virtshell control structure
* @cmd command reference
* @opt starting point for the search
*
* Returns the next argv argument after OPT (or the first one if OPT
* is NULL), or NULL if no more are present.
*
* Requires that a VSH_OT_ARGV option be last in the
* list of supported options in CMD->def->opts.
*/
const vshCmdOpt *
vshCommandOptArgv(vshControl *ctl G_GNUC_UNUSED, const vshCmd *cmd,
const vshCmdOpt *opt)
{
opt = opt ? opt->next : cmd->opts;
while (opt) {
if (opt->def->type == VSH_OT_ARGV)
return opt;
opt = opt->next;
}
return NULL;
}
/**
* vshBlockJobOptionBandwidth:
* @ctl: virsh control data
* @cmd: virsh command description
* @bytes: return bandwidth in bytes/s instead of MiB/s
* @bandwidth: return value
*
* Extracts the value of --bandwidth either as a wrap-able number without scale
* or as a scaled integer. The returned value is checked to fit into a unsigned
* long data type. This is a legacy compatibility function and it should not
* be used for things other the block job APIs.
*
* Returns 0 on success, -1 on error.
*/
int
vshBlockJobOptionBandwidth(vshControl *ctl,
const vshCmd *cmd,
bool bytes,
unsigned long *bandwidth)
{
vshCmdOpt *arg;
char *end;
unsigned long long bw;
int ret;
if ((ret = vshCommandOpt(cmd, "bandwidth", &arg, true)) <= 0)
return ret;
/* due to historical reasons we declare to parse negative numbers and wrap
* them to the unsigned data type. */
if (virStrToLong_ul(arg->data, NULL, 10, bandwidth) < 0) {
/* try to parse the number as scaled size in this case we don't accept
* wrapping since it would be ridiculous. In case of a 32 bit host,
* limit the value to ULONG_MAX */
if (virStrToLong_ullp(arg->data, &end, 10, &bw) < 0 ||
virScaleInteger(&bw, end, 1, ULONG_MAX) < 0) {
vshError(ctl,
_("Scaled numeric value '%s' for <--bandwidth> option is "
"malformed or out of range"), arg->data);
return -1;
}
if (!bytes)
bw >>= 20;
*bandwidth = bw;
}
return 0;
}
/*
* Executes command(s) and returns return code from last command
*/
bool
vshCommandRun(vshControl *ctl, const vshCmd *cmd)
{
const vshClientHooks *hooks = ctl->hooks;
bool ret = true;
while (cmd) {
gint64 before, after;
bool enable_timing = ctl->timing;
before = g_get_real_time();
if ((cmd->def->flags & VSH_CMD_FLAG_NOCONNECT) ||
(hooks && hooks->connHandler && hooks->connHandler(ctl))) {
ret = cmd->def->handler(ctl, cmd);
} else {
/* connection is not usable, return error */
ret = false;
}
after = g_get_real_time();
/* try to automatically catch disconnections */
if (!ret &&
((last_error != NULL) &&
(((last_error->code == VIR_ERR_SYSTEM_ERROR) &&
(last_error->domain == VIR_FROM_REMOTE)) ||
(last_error->code == VIR_ERR_RPC) ||
(last_error->code == VIR_ERR_NO_CONNECT) ||
(last_error->code == VIR_ERR_INVALID_CONN))))
disconnected++;
if (!ret)
vshReportError(ctl);
if (STREQ(cmd->def->name, "quit") ||
STREQ(cmd->def->name, "exit")) /* hack ... */
return ret;
if (enable_timing) {
double diff_ms = (after - before) / 1000.0;
vshPrint(ctl, _("\n(Time: %.3f ms)\n\n"), diff_ms);
} else {
vshPrintExtra(ctl, "\n");
}
cmd = cmd->next;
}
return ret;
}
/* ---------------
* Command parsing
* ---------------
*/
typedef enum {
VSH_TK_ERROR, /* Failed to parse a token */
VSH_TK_ARG, /* Arbitrary argument, might be option or empty */
VSH_TK_SUBCMD_END, /* Separation between commands */
VSH_TK_END /* No more commands */
} vshCommandToken;
typedef struct _vshCommandParser vshCommandParser;
struct _vshCommandParser {
vshCommandToken(*getNextArg)(vshControl *, vshCommandParser *,
char **, bool);
/* vshCommandStringGetArg() */
char *pos;
const char *originalLine;
size_t point;
/* vshCommandArgvGetArg() */
char **arg_pos;
char **arg_end;
};
static bool
vshCommandParse(vshControl *ctl, vshCommandParser *parser, vshCmd **partial)
{
char *tkdata = NULL;
vshCmd *clast = NULL;
vshCmdOpt *first = NULL;
const vshCmdDef *cmd = NULL;
if (!partial) {
g_clear_pointer(&ctl->cmd, vshCommandFree);
}
while (1) {
vshCmdOpt *last = NULL;
vshCommandToken tk;
bool data_only = false;
uint64_t opts_need_arg = 0;
uint64_t opts_required = 0;
uint64_t opts_seen = 0;
cmd = NULL;
first = NULL;
if (partial) {
g_clear_pointer(partial, vshCommandFree);
}
while (1) {
const vshCmdOptDef *opt = NULL;
tkdata = NULL;
tk = parser->getNextArg(ctl, parser, &tkdata, true);
if (tk == VSH_TK_ERROR)
goto syntaxError;
if (tk != VSH_TK_ARG) {
VIR_FREE(tkdata);
break;
}
if (cmd == NULL) {
/* first token must be command name or comment */
if (*tkdata == '#') {
do {
VIR_FREE(tkdata);
tk = parser->getNextArg(ctl, parser, &tkdata, false);
} while (tk == VSH_TK_ARG);
VIR_FREE(tkdata);
break;
} else if (!(cmd = vshCmddefSearch(tkdata))) {
if (!partial)
vshError(ctl, _("unknown command: '%s'"), tkdata);
goto syntaxError; /* ... or ignore this command only? */
}
/* aliases need to be resolved to the actual commands */
if (cmd->flags & VSH_CMD_FLAG_ALIAS) {
VIR_FREE(tkdata);
tkdata = g_strdup(cmd->alias);
cmd = vshCmddefSearch(tkdata);
}
vshCmddefOptParse(cmd, &opts_need_arg, &opts_required);
VIR_FREE(tkdata);
} else if (data_only) {
goto get_data;
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
g_ascii_isalnum(tkdata[2])) {
char *optstr = strchr(tkdata + 2, '=');
size_t opt_index = 0;
if (optstr) {
*optstr = '\0'; /* convert the '=' to '\0' */
optstr = g_strdup(optstr + 1);
}
/* Special case 'help' to ignore all spurious options */
if (!(opt = vshCmddefGetOption(ctl, cmd, tkdata + 2,
&opts_seen, &opt_index,
&optstr, partial == NULL))) {
VIR_FREE(optstr);
if (STREQ(cmd->name, "help"))
continue;
goto syntaxError;
}
VIR_FREE(tkdata);
if (opt->type != VSH_OT_BOOL) {
/* option data */
if (optstr)
tkdata = optstr;
else
tk = parser->getNextArg(ctl, parser, &tkdata, partial == NULL);
if (tk == VSH_TK_ERROR)
goto syntaxError;
if (tk != VSH_TK_ARG) {
if (partial) {
vshCmdOpt *arg = g_new0(vshCmdOpt, 1);
arg->def = opt;
arg->data = g_steal_pointer(&tkdata);
arg->next = NULL;
if (parser->pos - parser->originalLine == parser->point - 1)
arg->completeThis = true;
if (!first)
first = arg;
if (last)
last->next = arg;
last = arg;
} else {
vshError(ctl,
_("expected syntax: --%s <%s>"),
opt->name,
opt->type ==
VSH_OT_INT ? _("number") : _("string"));
}
goto syntaxError;
}
if (opt->type != VSH_OT_ARGV)
opts_need_arg &= ~(1ULL << opt_index);
} else {
tkdata = NULL;
if (optstr) {
if (!partial)
vshError(ctl, _("invalid '=' after option --%s"),
opt->name);
VIR_FREE(optstr);
goto syntaxError;
}
}
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
tkdata[2] == '\0') {
VIR_FREE(tkdata);
data_only = true;
continue;
} else {
get_data:
/* Special case 'help' to ignore spurious data */
if (!(opt = vshCmddefGetData(cmd, &opts_need_arg,
&opts_seen)) &&
STRNEQ(cmd->name, "help")) {
if (!partial)
vshError(ctl, _("unexpected data '%s'"), tkdata);
goto syntaxError;
}
}
if (opt) {
/* save option */
vshCmdOpt *arg = g_new0(vshCmdOpt, 1);
arg->def = opt;
arg->data = g_steal_pointer(&tkdata);
arg->next = NULL;
if (parser->pos - parser->originalLine == parser->point)
arg->completeThis = true;
if (!first)
first = arg;
if (last)
last->next = arg;
last = arg;
if (!partial)
vshDebug(ctl, VSH_ERR_INFO, "%s: %s(%s): %s\n",
cmd->name,
opt->name,
opt->type != VSH_OT_BOOL ? _("optdata") : _("bool"),
opt->type != VSH_OT_BOOL ? arg->data : _("(none)"));
}
}
/* command parsed -- allocate new struct for the command */
if (cmd) {
vshCmd *c = g_new0(vshCmd, 1);
vshCmdOpt *tmpopt = first;
/* if we encountered --help, replace parsed command with
* 'help <cmdname>' */
for (tmpopt = first; tmpopt; tmpopt = tmpopt->next) {
const vshCmdDef *help;
if (STRNEQ(tmpopt->def->name, "help"))
continue;
help = vshCmddefSearch("help");
vshCommandOptFree(first);
first = g_new0(vshCmdOpt, 1);
first->def = help->opts;
first->data = g_strdup(cmd->name);
first->next = NULL;
cmd = help;
opts_required = 0;
opts_seen = 0;
break;
}
c->opts = g_steal_pointer(&first);
c->def = cmd;
c->next = NULL;
if (!partial &&
vshCommandCheckOpts(ctl, c, opts_required, opts_seen) < 0) {
vshCommandFree(c);
goto syntaxError;
}
if (partial) {
vshCommandFree(*partial);
*partial = c;
} else {
if (!ctl->cmd)
ctl->cmd = c;
if (clast)
clast->next = c;
clast = c;
}
}
if (tk == VSH_TK_END)
break;
}
return true;
syntaxError:
if (partial) {
vshCmd *tmp;
tmp = g_new0(vshCmd, 1);
tmp->opts = first;
tmp->def = cmd;
*partial = tmp;
} else {
g_clear_pointer(&ctl->cmd, vshCommandFree);
vshCommandOptFree(first);
}
VIR_FREE(tkdata);
return false;
}
/* --------------------
* Command argv parsing
* --------------------
*/
static vshCommandToken ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
vshCommandArgvGetArg(vshControl *ctl G_GNUC_UNUSED,
vshCommandParser *parser,
char **res,
bool report G_GNUC_UNUSED)
{
if (parser->arg_pos == parser->arg_end) {
*res = NULL;
return VSH_TK_END;
}
*res = g_strdup(*parser->arg_pos);
parser->arg_pos++;
return VSH_TK_ARG;
}
bool
vshCommandArgvParse(vshControl *ctl, int nargs, char **argv)
{
vshCommandParser parser = { 0 };
if (nargs <= 0)
return false;
parser.arg_pos = argv;
parser.arg_end = argv + nargs;
parser.getNextArg = vshCommandArgvGetArg;
return vshCommandParse(ctl, &parser, NULL);
}
/* ----------------------
* Command string parsing
* ----------------------
*/
static vshCommandToken ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
vshCommandStringGetArg(vshControl *ctl, vshCommandParser *parser, char **res,
bool report)
{
bool single_quote = false;
bool double_quote = false;
char *p = parser->pos;
char *q = g_strdup(p);
*res = q;
while (*p == ' ' || *p == '\t' || (*p == '\\' && p[1] == '\n'))
p += 1 + (*p == '\\');
if (*p == '\0')
return VSH_TK_END;
if (*p == ';' || *p == '\n') {
parser->pos = ++p; /* = \0 or begin of next command */
return VSH_TK_SUBCMD_END;
}
if (*p == '#') { /* Argument starting with # is comment to end of line */
while (*p && *p != '\n')
p++;
parser->pos = p + !!*p;
return VSH_TK_SUBCMD_END;
}
while (*p) {
/* end of token is blank space or ';' */
if (!double_quote && !single_quote &&
(*p == ' ' || *p == '\t' || *p == ';' || *p == '\n'))
break;
if (!double_quote && *p == '\'') { /* single quote */
single_quote = !single_quote;
p++;
continue;
} else if (!single_quote && *p == '\\') { /* escape */
/*
* The same as in shell, a \ in "" is an escaper,
* but a \ in '' is not an escaper.
*/
p++;
if (*p == '\0') {
if (report)
vshError(ctl, "%s", _("dangling \\"));
return VSH_TK_ERROR;
} else if (*p == '\n') {
/* Elide backslash-newline entirely */
p++;
continue;
}
} else if (!single_quote && *p == '"') { /* double quote */
double_quote = !double_quote;
p++;
continue;
}
*q++ = *p++;
}
if (double_quote) {
/* We have seen a double quote, but not it's companion
* ending. It's valid though, in case when we're called
* from completer (report = false), but it's not valid
* when parsing real command (report= true). */
if (report) {
vshError(ctl, "%s", _("missing \""));
return VSH_TK_ERROR;
}
}
*q = '\0';
parser->pos = p;
return VSH_TK_ARG;
}
/**
* vshCommandStringParse:
* @ctl virsh control structure
* @cmdstr: string to parse
* @partial: store partially parsed command here
* @point: position of cursor (rl_point)
*
* Parse given string @cmdstr as a command and store it under
* @ctl->cmd. For readline completion, if @partial is not NULL on
* the input then errors in parsing are ignored (because user is
* still in progress of writing the command string) and partially
* parsed command is stored at *@partial (caller has to free it
* afterwards). Among with @partial, caller must set @point which
* is the position of cursor in @cmdstr (offset, numbered from 1).
* Parser will then set @completeThis attribute to true for the
* vshCmdOpt that appeared under the cursor.
*/
bool
vshCommandStringParse(vshControl *ctl,
char *cmdstr,
vshCmd **partial,
size_t point)
{
vshCommandParser parser = { 0 };
if (cmdstr == NULL || *cmdstr == '\0')
return false;
parser.pos = cmdstr;
parser.originalLine = cmdstr;
parser.point = point;
parser.getNextArg = vshCommandStringGetArg;
return vshCommandParse(ctl, &parser, partial);
}
/**
* virshCommandOptTimeoutToMs:
* @ctl virsh control structure
* @cmd command reference
* @timeout result
*
* Parse an optional --timeout parameter in seconds, but store the
* value of the timeout in milliseconds.
* See vshCommandOptInt()
*/
int
vshCommandOptTimeoutToMs(vshControl *ctl, const vshCmd *cmd, int *timeout)
{
int ret;
unsigned int utimeout;
if ((ret = vshCommandOptUInt(ctl, cmd, "timeout", &utimeout)) <= 0)
return ret;
/* Ensure that the timeout is not zero and that we can convert
* it from seconds to milliseconds without overflowing. */
if (utimeout == 0 || utimeout > INT_MAX / 1000) {
vshError(ctl,
_("Numeric value '%u' for <%s> option is malformed or out of range"),
utimeout,
"timeout");
ret = -1;
} else {
*timeout = ((int) utimeout) * 1000;
}
return ret;
}
/* ---------------
* Misc utils
* ---------------
*/
/* Return a non-NULL string representation of a typed parameter; exit on
* unknown type. */
char *
vshGetTypedParamValue(vshControl *ctl, virTypedParameterPtr item)
{
switch (item->type) {
case VIR_TYPED_PARAM_INT:
return g_strdup_printf("%d", item->value.i);
break;
case VIR_TYPED_PARAM_UINT:
return g_strdup_printf("%u", item->value.ui);
break;
case VIR_TYPED_PARAM_LLONG:
return g_strdup_printf("%lld", item->value.l);
break;
case VIR_TYPED_PARAM_ULLONG:
return g_strdup_printf("%llu", item->value.ul);
break;
case VIR_TYPED_PARAM_DOUBLE:
return g_strdup_printf("%f", item->value.d);
break;
case VIR_TYPED_PARAM_BOOLEAN:
return g_strdup(item->value.b ? _("yes") : _("no"));
break;
case VIR_TYPED_PARAM_STRING:
return g_strdup(item->value.s);
break;
default:
vshError(ctl, _("unimplemented parameter type %d"), item->type);
exit(EXIT_FAILURE);
}
}
void
vshDebug(vshControl *ctl, int level, const char *format, ...)
{
va_list ap;
g_autofree char *str = NULL;
/* Aligning log levels to that of libvirt.
* Traces with levels >= user-specified-level
* gets logged into file
*/
if (level < ctl->debug)
return;
va_start(ap, format);
vshOutputLogFile(ctl, level, format, ap);
va_end(ap);
va_start(ap, format);
str = g_strdup_vprintf(format, ap);
va_end(ap);
fputs(str, stdout);
fflush(stdout);
}
void
vshPrintExtra(vshControl *ctl, const char *format, ...)
{
va_list ap;
g_autofree char *str = NULL;
if (ctl && ctl->quiet)
return;
va_start(ap, format);
str = g_strdup_vprintf(format, ap);
va_end(ap);
fputs(str, stdout);
fflush(stdout);
}
void
vshPrint(vshControl *ctl G_GNUC_UNUSED, const char *format, ...)
{
va_list ap;
g_autofree char *str = NULL;
va_start(ap, format);
str = g_strdup_vprintf(format, ap);
va_end(ap);
fputs(str, stdout);
fflush(stdout);
}
bool
vshTTYIsInterruptCharacter(vshControl *ctl G_GNUC_UNUSED,
const char chr G_GNUC_UNUSED)
{
#ifndef WIN32
if (ctl->istty &&
ctl->termattr.c_cc[VINTR] == chr)
return true;
#endif
return false;
}
bool
vshTTYAvailable(vshControl *ctl)
{
return ctl->istty;
}
int
vshTTYDisableInterrupt(vshControl *ctl G_GNUC_UNUSED)
{
#ifndef WIN32
struct termios termset = ctl->termattr;
if (!ctl->istty)
return -1;
/* check if we need to set the terminal */
if (termset.c_cc[VINTR] == _POSIX_VDISABLE)
return 0;
termset.c_cc[VINTR] = _POSIX_VDISABLE;
termset.c_lflag &= ~ICANON;
if (tcsetattr(STDIN_FILENO, TCSANOW, &termset) < 0)
return -1;
#endif
return 0;
}
int
vshTTYRestore(vshControl *ctl G_GNUC_UNUSED)
{
#ifndef WIN32
if (!ctl->istty)
return 0;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &ctl->termattr) < 0)
return -1;
#endif
return 0;
}
int
vshTTYMakeRaw(vshControl *ctl G_GNUC_UNUSED,
bool report_errors G_GNUC_UNUSED)
{
#ifndef WIN32
struct termios rawattr = ctl->termattr;
if (!ctl->istty) {
if (report_errors) {
vshError(ctl, "%s",
_("unable to make terminal raw: console isn't a tty"));
}
return -1;
}
cfmakeraw(&rawattr);
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &rawattr) < 0) {
if (report_errors)
vshError(ctl, _("unable to set tty attributes: %s"),
g_strerror(errno));
return -1;
}
#endif
return 0;
}
void
vshError(vshControl *ctl, const char *format, ...)
{
va_list ap;
g_autofree char *str = NULL;
if (ctl != NULL) {
va_start(ap, format);
vshOutputLogFile(ctl, VSH_ERR_ERROR, format, ap);
va_end(ap);
}
/* Most output is to stdout, but if someone ran virsh 2>&1, then
* printing to stderr will not interleave correctly with stdout
* unless we flush between every transition between streams. */
fflush(stdout);
fputs(_("error: "), stderr);
va_start(ap, format);
str = g_strdup_vprintf(format, ap);
va_end(ap);
fprintf(stderr, "%s\n", NULLSTR(str));
fflush(stderr);
}
void
vshEventLoop(void *opaque)
{
vshControl *ctl = opaque;
while (1) {
bool quit = false;
VIR_WITH_MUTEX_LOCK_GUARD(&ctl->lock) {
quit = ctl->quit;
}
if (quit)
break;
if (virEventRunDefaultImpl() < 0)
vshReportError(ctl);
}
}
/*
* Helpers for waiting for a libvirt event.
*/
/* We want to use SIGINT to cancel a wait; but as signal handlers
* don't have an opaque argument, we have to use static storage. */
#ifndef WIN32
static int vshEventFd = -1;
static struct sigaction vshEventOldAction;
/* Signal handler installed in vshEventStart, removed in vshEventCleanup. */
static void
vshEventInt(int sig G_GNUC_UNUSED,
siginfo_t *siginfo G_GNUC_UNUSED,
void *context G_GNUC_UNUSED)
{
char reason = VSH_EVENT_INTERRUPT;
if (vshEventFd >= 0)
ignore_value(safewrite(vshEventFd, &reason, 1));
}
#endif /* !WIN32 */
/* Event loop handler used to limit length of waiting for any other event. */
void
vshEventTimeout(int timer G_GNUC_UNUSED,
void *opaque)
{
vshControl *ctl = opaque;
char reason = VSH_EVENT_TIMEOUT;
if (ctl->eventPipe[1] >= 0)
ignore_value(safewrite(ctl->eventPipe[1], &reason, 1));
}
/**
* vshEventStart:
* @ctl vsh command struct
* @timeout_ms max wait time in milliseconds, or 0 for indefinite
*
* Set up a wait for a libvirt event. The wait can be canceled by
* SIGINT or by calling vshEventDone() in your event handler. If
* @timeout_ms is positive, the wait will also end if the timeout
* expires. Call vshEventWait() to block the main thread (the event
* handler runs in the event loop thread). When done (including if
* there was an error registering for an event), use vshEventCleanup()
* to quit waiting. Returns 0 on success, -1 on failure. */
int
vshEventStart(vshControl *ctl, int timeout_ms)
{
#ifndef WIN32
struct sigaction action;
assert(vshEventFd == -1);
#endif /* !WIN32 */
assert(ctl->eventPipe[0] == -1 && ctl->eventPipe[1] == -1 &&
ctl->eventTimerId >= 0);
if (virPipe(ctl->eventPipe) < 0) {
vshSaveLibvirtError();
vshReportError(ctl);
return -1;
}
#ifndef WIN32
vshEventFd = ctl->eventPipe[1];
action.sa_sigaction = vshEventInt;
action.sa_flags = SA_SIGINFO;
sigemptyset(&action.sa_mask);
sigaction(SIGINT, &action, &vshEventOldAction);
#endif /* !WIN32 */
if (timeout_ms)
virEventUpdateTimeout(ctl->eventTimerId, timeout_ms);
return 0;
}
/**
* vshEventDone:
* @ctl vsh command struct
*
* Call this from an event callback to let the main thread quit
* blocking on further events.
*/
void
vshEventDone(vshControl *ctl)
{
char reason = VSH_EVENT_DONE;
if (ctl->eventPipe[1] >= 0)
ignore_value(safewrite(ctl->eventPipe[1], &reason, 1));
}
/**
* vshEventWait:
* @ctl vsh command struct
*
* Call this in the main thread after calling vshEventStart() then
* registering for one or more events. This call will block until
* SIGINT, the timeout registered at the start, or until one of your
* event handlers calls vshEventDone(). Returns an enum VSH_EVENT_*
* stating how the wait concluded, or -1 on error.
*/
int
vshEventWait(vshControl *ctl)
{
char buf;
int rv;
assert(ctl->eventPipe[0] >= 0);
while ((rv = read(ctl->eventPipe[0], &buf, 1)) < 0 && errno == EINTR);
if (rv != 1) {
if (!rv)
errno = EPIPE;
vshError(ctl, _("failed to determine loop exit status: %s"),
g_strerror(errno));
return -1;
}
return buf;
}
/**
* vshEventCleanup:
* @ctl vsh control struct
*
* Call at the end of any function that has used vshEventStart(), to
* tear down any remaining SIGINT or timeout handlers.
*/
void
vshEventCleanup(vshControl *ctl)
{
#ifndef WIN32
if (vshEventFd >= 0) {
sigaction(SIGINT, &vshEventOldAction, NULL);
vshEventFd = -1;
}
#endif /* !WIN32 */
VIR_FORCE_CLOSE(ctl->eventPipe[0]);
VIR_FORCE_CLOSE(ctl->eventPipe[1]);
virEventUpdateTimeout(ctl->eventTimerId, -1);
}
#ifdef O_SYNC
# define LOGFILE_FLAGS (O_WRONLY | O_APPEND | O_CREAT | O_SYNC)
#else
# define LOGFILE_FLAGS (O_WRONLY | O_APPEND | O_CREAT)
#endif
/**
* vshOpenLogFile:
*
* Open log file.
*/
void
vshOpenLogFile(vshControl *ctl)
{
if (ctl->logfile == NULL)
return;
if ((ctl->log_fd = open(ctl->logfile, LOGFILE_FLAGS, FILE_MODE)) < 0) {
vshError(ctl, "%s",
_("failed to open the log file. check the log file path"));
exit(EXIT_FAILURE);
}
}
/**
* vshOutputLogFile:
*
* Outputting an error to log file.
*/
void
vshOutputLogFile(vshControl *ctl, int log_level, const char *msg_format,
va_list ap)
{
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
g_autofree char *str = NULL;
size_t len;
const char *lvl = "";
g_autoptr(GDateTime) now = g_date_time_new_now_local();
g_autofree gchar *nowstr = NULL;
if (ctl->log_fd == -1)
return;
/**
* create log format
*
* [YYYY.MM.DD HH:MM:SS SIGNATURE PID] LOG_LEVEL message
*/
nowstr = g_date_time_format(now, "%Y.%m.%d %H:%M:%S");
virBufferAsprintf(&buf, "[%s %s %d] ",
nowstr,
ctl->progname,
(int) getpid());
switch (log_level) {
case VSH_ERR_DEBUG:
lvl = LVL_DEBUG;
break;
case VSH_ERR_INFO:
lvl = LVL_INFO;
break;
case VSH_ERR_NOTICE:
lvl = LVL_INFO;
break;
case VSH_ERR_WARNING:
lvl = LVL_WARNING;
break;
case VSH_ERR_ERROR:
lvl = LVL_ERROR;
break;
default:
lvl = LVL_DEBUG;
break;
}
virBufferAsprintf(&buf, "%s ", lvl);
virBufferVasprintf(&buf, msg_format, ap);
virBufferTrim(&buf, "\n");
virBufferAddChar(&buf, '\n');
str = virBufferContentAndReset(&buf);
len = strlen(str);
/* write log */
if (safewrite(ctl->log_fd, str, len) < 0)
goto error;
return;
error:
vshCloseLogFile(ctl);
vshError(ctl, "%s", _("failed to write the log file"));
}
/**
* vshCloseLogFile:
*
* Close log file.
*/
void
vshCloseLogFile(vshControl *ctl)
{
/* log file close */
if (VIR_CLOSE(ctl->log_fd) < 0) {
vshError(ctl, _("%s: failed to write log file: %s"),
ctl->logfile ? ctl->logfile : "?",
g_strerror(errno));
}
g_clear_pointer(&ctl->logfile, g_free);
}
#ifndef WIN32
static void
vshPrintRaw(vshControl *ctl, ...)
{
va_list ap;
char *key;
va_start(ap, ctl);
while ((key = va_arg(ap, char *)) != NULL)
vshPrint(ctl, "%s\r\n", key);
va_end(ap);
}
/**
* vshAskReedit:
* @msg: Question to ask user
*
* Ask user if he wants to return to previously
* edited file.
*
* Returns 'y' if he wants to
* 'n' if he doesn't want to
* 'i' if he wants to try defining it again while ignoring validation
* 'f' if he forcibly wants to
* -1 on error
* 0 otherwise
*/
int
vshAskReedit(vshControl *ctl, const char *msg, bool relax_avail)
{
int c = -1;
if (!isatty(STDIN_FILENO))
return -1;
vshReportError(ctl);
if (vshTTYMakeRaw(ctl, false) < 0)
return -1;
while (true) {
vshPrint(ctl, "\r%s %s %s: ", msg, _("Try again?"),
relax_avail ? "[y,n,i,f,?]" : "[y,n,f,?]");
c = g_ascii_tolower(getchar());
if (c == '?') {
vshPrintRaw(ctl,
"",
_("y - yes, start editor again"),
_("n - no, throw away my changes"),
NULL);
if (relax_avail) {
vshPrintRaw(ctl,
_("i - turn off validation and try to redefine "
"again"),
NULL);
}
vshPrintRaw(ctl,
_("f - force, try to redefine again"),
_("? - print this help"),
NULL);
continue;
} else if (c == 'y' || c == 'n' || c == 'f' ||
(relax_avail && c == 'i')) {
break;
}
}
vshTTYRestore(ctl);
vshPrint(ctl, "\r\n");
return c;
}
#else /* WIN32 */
int
vshAskReedit(vshControl *ctl,
const char *msg G_GNUC_UNUSED,
bool relax_avail G_GNUC_UNUSED)
{
vshDebug(ctl, VSH_ERR_WARNING, "%s", _("This function is not "
"supported on WIN32 platform"));
return 0;
}
#endif /* WIN32 */
void
vshEditUnlinkTempfile(char *file)
{
if (!file)
return;
ignore_value(unlink(file));
g_free(file);
}
/* Common code for the edit / net-edit / pool-edit functions which follow. */
char *
vshEditWriteToTempFile(vshControl *ctl, const char *doc)
{
g_autofree char *filename = NULL;
g_autoptr(vshTempFile) ret = NULL;
const char *tmpdir;
VIR_AUTOCLOSE fd = -1;
tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
filename = g_strdup_printf("%s/virshXXXXXX.xml", tmpdir);
fd = g_mkstemp_full(filename, O_RDWR | O_CLOEXEC, S_IRUSR | S_IWUSR);
if (fd == -1) {
vshError(ctl, _("g_mkstemp_full: failed to create temporary file: %s"),
g_strerror(errno));
return NULL;
}
ret = g_steal_pointer(&filename);
if (safewrite(fd, doc, strlen(doc)) == -1) {
vshError(ctl, _("write: %s: failed to write to temporary file: %s"),
ret, g_strerror(errno));
return NULL;
}
if (VIR_CLOSE(fd) < 0) {
vshError(ctl, _("close: %s: failed to write or close temporary file: %s"),
ret, g_strerror(errno));
return NULL;
}
/* Temporary filename: caller frees. */
return g_steal_pointer(&ret);
}
/* Characters permitted in $EDITOR environment variable and temp filename. */
#define ACCEPTED_CHARS \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/_.:@"
/* Hard-code default editor used as a fallback if not configured by
* VISUAL or EDITOR environment variables. */
#define DEFAULT_EDITOR "vi"
int
vshEditFile(vshControl *ctl, const char *filename)
{
const char *editor;
g_autoptr(virCommand) cmd = NULL;
int outfd = STDOUT_FILENO;
int errfd = STDERR_FILENO;
editor = getenv("VISUAL");
if (!editor)
editor = getenv("EDITOR");
if (!editor)
editor = DEFAULT_EDITOR;
/* Check that filename doesn't contain shell meta-characters, and
* if it does, refuse to run. Follow the Unix conventions for
* EDITOR: the user can intentionally specify command options, so
* we don't protect any shell metacharacters there. Lots more
* than virsh will misbehave if EDITOR has bogus contents (which
* is why sudo scrubs it by default). Conversely, if the editor
* is safe, we can run it directly rather than wasting a shell.
*/
if (strspn(editor, ACCEPTED_CHARS) != strlen(editor)) {
if (strspn(filename, ACCEPTED_CHARS) != strlen(filename)) {
vshError(ctl,
_("%s: temporary filename contains shell meta or other "
"unacceptable characters (is $TMPDIR wrong?)"),
filename);
return -1;
}
cmd = virCommandNewArgList("sh", "-c", NULL);
virCommandAddArgFormat(cmd, "%s %s", editor, filename);
} else {
cmd = virCommandNewArgList(editor, filename, NULL);
}
virCommandSetInputFD(cmd, STDIN_FILENO);
virCommandSetOutputFD(cmd, &outfd);
virCommandSetErrorFD(cmd, &errfd);
if (virCommandRunAsync(cmd, NULL) < 0 ||
virCommandWait(cmd, NULL) < 0) {
vshReportError(ctl);
return -1;
}
return 0;
}
char *
vshEditReadBackFile(vshControl *ctl, const char *filename)
{
char *ret;
if (virFileReadAll(filename, VSH_MAX_XML_FILE, &ret) == -1) {
vshError(ctl,
_("%s: failed to read temporary file: %s"),
filename, g_strerror(errno));
return NULL;
}
return ret;
}
/* Tree listing helpers. */
static int
vshTreePrintInternal(vshControl *ctl,
vshTreeLookup lookup,
void *opaque,
int num_devices,
int devid,
int lastdev,
bool root,
virBuffer *indent)
{
size_t i;
int nextlastdev = -1;
const char *dev = (lookup)(devid, false, opaque);
/* Print this device, with indent if not at root */
vshPrint(ctl, "%s%s%s\n", virBufferCurrentContent(indent),
root ? "" : "+- ", dev);
/* Update indent to show '|' or ' ' for child devices */
if (!root) {
virBufferAddChar(indent, devid == lastdev ? ' ' : '|');
virBufferAddChar(indent, ' ');
}
/* Determine the index of the last child device */
for (i = 0; i < num_devices; i++) {
const char *parent = (lookup)(i, true, opaque);
if (parent && STREQ(parent, dev))
nextlastdev = i;
}
/* If there is a child device, then print another blank line */
if (nextlastdev != -1)
vshPrint(ctl, "%s |\n", virBufferCurrentContent(indent));
/* Finally print all children */
virBufferAddLit(indent, " ");
for (i = 0; i < num_devices; i++) {
const char *parent = (lookup)(i, true, opaque);
if (parent && STREQ(parent, dev) &&
vshTreePrintInternal(ctl, lookup, opaque,
num_devices, i, nextlastdev,
false, indent) < 0)
return -1;
}
virBufferTrim(indent, " ");
/* If there was no child device, and we're the last in
* a list of devices, then print another blank line */
if (nextlastdev == -1 && devid == lastdev)
vshPrint(ctl, "%s\n", virBufferCurrentContent(indent));
if (!root)
virBufferTrimLen(indent, 2);
return 0;
}
int
vshTreePrint(vshControl *ctl, vshTreeLookup lookup, void *opaque,
int num_devices, int devid)
{
int ret;
g_auto(virBuffer) indent = VIR_BUFFER_INITIALIZER;
ret = vshTreePrintInternal(ctl, lookup, opaque, num_devices,
devid, devid, true, &indent);
if (ret < 0)
vshError(ctl, "%s", _("Failed to complete tree listing"));
return ret;
}
/**
* vshReadlineCommandGenerator:
*
* Generator function for command completion. Used also for completing the
* '--command' option of the 'help' command.
*
* Returns a string list of all commands, or NULL on failure.
*/
static char **
vshReadlineCommandGenerator(void)
{
size_t grp_list_index = 0;
const vshCmdGrp *grp;
size_t ret_size = 0;
g_auto(GStrv) ret = NULL;
grp = cmdGroups;
for (grp_list_index = 0; grp[grp_list_index].name; grp_list_index++) {
const vshCmdDef *cmds = grp[grp_list_index].commands;
size_t cmd_list_index;
for (cmd_list_index = 0; cmds[cmd_list_index].name; cmd_list_index++) {
const char *name = cmds[cmd_list_index].name;
if (cmds[cmd_list_index].flags & VSH_CMD_FLAG_ALIAS ||
cmds[cmd_list_index].flags & VSH_CMD_FLAG_HIDDEN)
continue;
VIR_REALLOC_N(ret, ret_size + 2);
ret[ret_size] = g_strdup(name);
ret_size++;
/* Terminate the string list properly. */
ret[ret_size] = NULL;
}
}
return g_steal_pointer(&ret);
}
#if WITH_READLINE
/* -----------------
* Readline stuff
* -----------------
*/
static char **
vshReadlineOptionsGenerator(const vshCmdDef *cmd,
vshCmd *last)
{
size_t list_index = 0;
size_t ret_size = 0;
g_auto(GStrv) ret = NULL;
if (!cmd)
return NULL;
if (!cmd->opts)
return NULL;
for (list_index = 0; cmd->opts[list_index].name; list_index++) {
const char *name = cmd->opts[list_index].name;
bool exists = false;
vshCmdOpt *opt = last->opts;
/* Skip aliases, we do not report them in help output either. */
if (cmd->opts[list_index].type == VSH_OT_ALIAS)
continue;
while (opt) {
if (STREQ(opt->def->name, name) && opt->def->type != VSH_OT_ARGV) {
exists = true;
break;
}
opt = opt->next;
}
if (exists)
continue;
VIR_REALLOC_N(ret, ret_size + 2);
ret[ret_size] = g_strdup_printf("--%s", name);
ret_size++;
/* Terminate the string list properly. */
ret[ret_size] = NULL;
}
return g_steal_pointer(&ret);
}
static const vshCmdOptDef *
vshReadlineCommandFindOpt(const vshCmd *partial)
{
const vshCmd *tmp = partial;
while (tmp) {
const vshCmdOpt *opt = tmp->opts;
while (opt) {
if (opt->completeThis)
return opt->def;
opt = opt->next;
}
tmp = tmp->next;
}
return NULL;
}
static int
vshCompleterFilter(char ***list,
const char *text)
{
char **newList = NULL;
size_t newList_len = 0;
size_t list_len;
size_t i;
if (!list || !*list)
return 0;
list_len = g_strv_length(*list);
newList = g_new0(char *, list_len + 1);
for (i = 0; i < list_len; i++) {
if (!STRPREFIX((*list)[i], text)) {
g_clear_pointer(&(*list)[i], g_free);
continue;
}
newList[newList_len] = g_steal_pointer(&(*list)[i]);
newList_len++;
}
newList = g_renew(char *, newList, newList_len + 1);
g_free(*list);
*list = newList;
return 0;
}
static char *
vshReadlineParse(const char *text, int state)
{
static char **list;
static size_t list_index;
char *ret = NULL;
/* Readline calls this function until NULL is returned. On
* the very first call @state is zero which means we should
* initialize those static variables above. On subsequent
* calls @state is non zero. */
if (!state) {
g_autoptr(vshCmd) partial = NULL;
const vshCmdDef *cmd = NULL;
const vshCmdOptDef *opt = NULL;
g_autofree char *line = g_strdup(rl_line_buffer);
g_clear_pointer(&list, g_strfreev);
list_index = 0;
*(line + rl_point) = '\0';
vshCommandStringParse(NULL, line, &partial, rl_point);
if (partial) {
cmd = partial->def;
partial->skipChecks = true;
}
if (cmd && STREQ(cmd->name, text)) {
/* Corner case - some commands share prefix (e.g.
* dump and dumpxml). If user typed 'dump<TAB><TAB>',
* then @text = "dump" and we want to offer command
* completion. If they typed 'dump <TAB><TAB>' then
* @text = "" (the space after the command) and we
* want to offer options completion for dump command.
*/
cmd = NULL;
}
opt = vshReadlineCommandFindOpt(partial);
if (!cmd) {
list = vshReadlineCommandGenerator();
} else if (!opt || opt->type == VSH_OT_BOOL) {
list = vshReadlineOptionsGenerator(cmd, partial);
} else if (opt && opt->completer) {
list = opt->completer(autoCompleteOpaque,
partial,
opt->completer_flags);
}
/* Escape completions, if needed (i.e. argument
* we are completing wasn't started with a quote
* character). This also enables filtering done
* below to work properly. */
if (list &&
!rl_completion_quote_character) {
size_t i;
for (i = 0; list[i]; i++) {
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
virBufferEscape(&buf, '\\', " ", "%s", list[i]);
VIR_FREE(list[i]);
list[i] = virBufferContentAndReset(&buf);
}
}
/* For string list returned by completers we have to do
* filtering based on @text because completers returns all
* possible strings. */
if (vshCompleterFilter(&list, text) < 0)
goto cleanup;
}
if (list) {
ret = g_strdup(list[list_index]);
list_index++;
}
cleanup:
if (!ret) {
g_clear_pointer(&list, g_strfreev);
list_index = 0;
}
return ret;
}
static char **
vshReadlineCompletion(const char *text,
int start G_GNUC_UNUSED,
int end G_GNUC_UNUSED)
{
return rl_completion_matches(text, vshReadlineParse);
}
static int
vshReadlineCharIsQuoted(char *line, int idx)
{
return idx > 0 &&
line[idx - 1] == '\\' &&
!vshReadlineCharIsQuoted(line, idx - 1);
}
# define HISTSIZE_MAX 500000
static int
vshReadlineInit(vshControl *ctl)
{
g_autofree char *userdir = NULL;
int max_history = 500;
g_autofree char *histsize_env = NULL;
const char *histsize_str = NULL;
const char *break_characters = " \t\n`@$><=;|&{(";
const char *quote_characters = "\"'";
/* Opaque data for autocomplete callbacks. */
autoCompleteOpaque = ctl;
rl_readline_name = ctl->name;
/* Tell the completer that we want a crack first. */
rl_attempted_completion_function = vshReadlineCompletion;
rl_basic_word_break_characters = break_characters;
rl_completer_quote_characters = quote_characters;
rl_char_is_quoted_p = vshReadlineCharIsQuoted;
histsize_env = g_strdup_printf("%s_HISTSIZE", ctl->env_prefix);
/* Limit the total size of the history buffer */
if ((histsize_str = getenv(histsize_env))) {
if (virStrToLong_i(histsize_str, NULL, 10, &max_history) < 0) {
vshError(ctl, _("Bad $%s value."), histsize_env);
return -1;
} else if (max_history > HISTSIZE_MAX || max_history < 0) {
vshError(ctl, _("$%s value should be between 0 "
"and %d"),
histsize_env, HISTSIZE_MAX);
return -1;
}
}
stifle_history(max_history);
/* Prepare to read/write history from/to the
* $XDG_CACHE_HOME/virtshell/history file
*/
userdir = virGetUserCacheDirectory();
ctl->historydir = g_strdup_printf("%s/%s", userdir, ctl->name);
ctl->historyfile = g_strdup_printf("%s/history", ctl->historydir);
read_history(ctl->historyfile);
return 0;
}
static void
vshReadlineDeinit(vshControl *ctl)
{
if (ctl->historyfile != NULL) {
if (g_mkdir_with_parents(ctl->historydir, 0755) < 0 &&
errno != EEXIST) {
vshError(ctl, _("Failed to create '%s': %s"),
ctl->historydir, g_strerror(errno));
} else {
write_history(ctl->historyfile);
}
}
g_clear_pointer(&ctl->historydir, g_free);
g_clear_pointer(&ctl->historyfile, g_free);
}
char *
vshReadline(vshControl *ctl G_GNUC_UNUSED, const char *prompt)
{
return readline(prompt);
}
void
vshReadlineHistoryAdd(const char *cmd)
{
return add_history(cmd);
}
#else /* !WITH_READLINE */
static int
vshReadlineInit(vshControl *ctl G_GNUC_UNUSED)
{
/* empty */
return 0;
}
static void
vshReadlineDeinit(vshControl *ctl G_GNUC_UNUSED)
{
/* empty */
}
char *
vshReadline(vshControl *ctl G_GNUC_UNUSED,
const char *prompt)
{
char line[1024];
char *r;
int len;
fputs(prompt, stdout);
fflush(stdout);
r = fgets(line, sizeof(line), stdin);
if (r == NULL) return NULL; /* EOF */
/* Chomp trailing \n */
len = strlen(r);
if (len > 0 && r[len-1] == '\n')
r[len-1] = '\0';
return g_strdup(r);
}
void
vshReadlineHistoryAdd(const char *cmd G_GNUC_UNUSED)
{
/* empty */
}
#endif /* !WITH_READLINE */
/*
* Initialize debug settings.
*/
static int
vshInitDebug(vshControl *ctl)
{
const char *debugEnv;
if (ctl->debug == VSH_DEBUG_DEFAULT) {
g_autofree char *env = g_strdup_printf("%s_DEBUG", ctl->env_prefix);
/* log level not set from commandline, check env variable */
debugEnv = getenv(env);
if (debugEnv) {
int debug;
if (virStrToLong_i(debugEnv, NULL, 10, &debug) < 0 ||
debug < VSH_ERR_DEBUG || debug > VSH_ERR_ERROR) {
vshError(ctl, _("%s_DEBUG not set with a valid numeric value"),
ctl->env_prefix);
} else {
ctl->debug = debug;
}
}
}
if (ctl->logfile == NULL) {
g_autofree char *env = g_strdup_printf("%s_LOG_FILE", ctl->env_prefix);
/* log file not set from cmdline */
debugEnv = getenv(env);
if (debugEnv && *debugEnv) {
ctl->logfile = g_strdup(debugEnv);
vshOpenLogFile(ctl);
}
}
return 0;
}
/*
* Initialize global data
*/
bool
vshInit(vshControl *ctl, const vshCmdGrp *groups, const vshCmdDef *set)
{
if (!ctl->hooks) {
vshError(ctl, "%s", _("client hooks cannot be NULL"));
return false;
}
if (!groups && !set) {
vshError(ctl, "%s", _("command groups and command set "
"cannot both be NULL"));
return false;
}
cmdGroups = groups;
cmdSet = set;
if (vshInitDebug(ctl) < 0 ||
(ctl->imode && vshReadlineInit(ctl) < 0))
return false;
return true;
}
bool
vshInitReload(vshControl *ctl)
{
if (!cmdGroups && !cmdSet) {
vshError(ctl, "%s", _("command groups and command are both NULL "
"run vshInit before reloading"));
return false;
}
if (vshInitDebug(ctl) < 0)
return false;
if (ctl->imode)
vshReadlineDeinit(ctl);
if (ctl->imode && vshReadlineInit(ctl) < 0)
return false;
return true;
}
void
vshDeinit(vshControl *ctl)
{
/* NB: Don't make calling of vshReadlineDeinit conditional on active
* interactive mode. */
vshReadlineDeinit(ctl);
vshCloseLogFile(ctl);
}
/* -----------------------------------------------
* Generic commands available to use by any client
* -----------------------------------------------
*/
static char **
vshCompleteHelpCommand(vshControl *ctl G_GNUC_UNUSED,
const vshCmd *cmd G_GNUC_UNUSED,
unsigned int completerflags G_GNUC_UNUSED)
{
return vshReadlineCommandGenerator();
}
const vshCmdOptDef opts_help[] = {
{.name = "command",
.type = VSH_OT_STRING,
.completer = vshCompleteHelpCommand,
.help = N_("Prints global help, command specific help, or help for a group of related commands")
},
{.name = NULL}
};
const vshCmdInfo info_help[] = {
{.name = "help",
.data = N_("print help")
},
{.name = "desc",
.data = N_("Prints global help, command specific help, or help for a\n"
" group of related commands")
},
{.name = NULL}
};
bool
cmdHelp(vshControl *ctl, const vshCmd *cmd)
{
const vshCmdDef *def = NULL;
const vshCmdGrp *grp = NULL;
const char *name = NULL;
if (vshCommandOptStringQuiet(ctl, cmd, "command", &name) <= 0) {
vshPrint(ctl, "%s", _("Grouped commands:\n\n"));
for (grp = cmdGroups; grp->name; grp++) {
vshPrint(ctl, _(" %s (help keyword '%s'):\n"), grp->name,
grp->keyword);
for (def = grp->commands; def->name; def++) {
if (def->flags & VSH_CMD_FLAG_ALIAS ||
def->flags & VSH_CMD_FLAG_HIDDEN)
continue;
vshPrint(ctl, " %-30s %s\n", def->name,
_(vshCmddefGetInfo(def, "help")));
}
vshPrint(ctl, "\n");
}
return true;
}
if ((def = vshCmddefSearch(name))) {
if (def->flags & VSH_CMD_FLAG_ALIAS)
def = vshCmddefSearch(def->alias);
return vshCmddefHelp(def);
} else if ((grp = vshCmdGrpSearch(name))) {
return vshCmdGrpHelp(ctl, grp);
} else {
vshError(ctl, _("command or command group '%s' doesn't exist"), name);
return false;
}
}
const vshCmdOptDef opts_cd[] = {
{.name = "dir",
.type = VSH_OT_STRING,
.help = N_("directory to switch to (default: home or else root)")
},
{.name = NULL}
};
const vshCmdInfo info_cd[] = {
{.name = "help",
.data = N_("change the current directory")
},
{.name = "desc",
.data = N_("Change the current directory.")
},
{.name = NULL}
};
bool
cmdCd(vshControl *ctl, const vshCmd *cmd)
{
const char *dir = NULL;
g_autofree char *dir_malloced = NULL;
if (!ctl->imode) {
vshError(ctl, "%s", _("cd: command valid only in interactive mode"));
return false;
}
if (vshCommandOptStringQuiet(ctl, cmd, "dir", &dir) <= 0)
dir = dir_malloced = virGetUserDirectory();
if (!dir)
dir = "/";
if (chdir(dir) == -1) {
vshError(ctl, _("cd: %s: %s"),
g_strerror(errno), dir);
return false;
}
return true;
}
const vshCmdOptDef opts_echo[] = {
{.name = "shell",
.type = VSH_OT_BOOL,
.help = N_("escape for shell use")
},
{.name = "xml",
.type = VSH_OT_BOOL,
.help = N_("escape for XML use")
},
{.name = "split",
.type = VSH_OT_BOOL,
.help = N_("split each argument on ','; ',,' is an escape sequence")
},
{.name = "err",
.type = VSH_OT_BOOL,
.help = N_("output to stderr"),
},
{.name = "str",
.type = VSH_OT_ALIAS,
.help = "string"
},
{.name = "hi",
.type = VSH_OT_ALIAS,
.help = "string=hello"
},
{.name = "string",
.type = VSH_OT_ARGV,
.help = N_("arguments to echo")
},
{.name = NULL}
};
const vshCmdInfo info_echo[] = {
{.name = "help",
.data = N_("echo arguments. Used for internal testing.")
},
{.name = "desc",
.data = N_("Echo back arguments, possibly with quoting. Used for internal testing.")
},
{.name = NULL}
};
/* Exists mainly for debugging virsh, but also handy for adding back
* quotes for later evaluation.
*/
bool
cmdEcho(vshControl *ctl, const vshCmd *cmd)
{
bool shell = vshCommandOptBool(cmd, "shell");
bool xml = vshCommandOptBool(cmd, "xml");
bool err = vshCommandOptBool(cmd, "err");
bool split = vshCommandOptBool(cmd, "split");
const vshCmdOpt *opt = NULL;
g_autofree char *arg = NULL;
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
VSH_EXCLUSIVE_OPTIONS_VAR(shell, xml);
VSH_EXCLUSIVE_OPTIONS_VAR(shell, split);
VSH_EXCLUSIVE_OPTIONS_VAR(xml, split);
while ((opt = vshCommandOptArgv(ctl, cmd, opt))) {
const char *curr = opt->data;
if (xml) {
virBufferEscapeString(&buf, "%s", curr);
} else if (shell) {
virBufferEscapeShell(&buf, curr);
} else if (split) {
g_auto(GStrv) spl = NULL;
GStrv n;
vshStringToArray(curr, &spl);
for (n = spl; *n; n++)
virBufferAsprintf(&buf, "%s\n", *n);
} else {
virBufferAdd(&buf, curr, -1);
}
virBufferAddChar(&buf, ' ');
}
virBufferTrim(&buf, " ");
arg = virBufferContentAndReset(&buf);
if (arg) {
if (err)
vshError(ctl, "%s", arg);
else
vshPrint(ctl, "%s", arg);
}
return true;
}
const vshCmdInfo info_pwd[] = {
{.name = "help",
.data = N_("print the current directory")
},
{.name = "desc",
.data = N_("Print the current directory.")
},
{.name = NULL}
};
bool
cmdPwd(vshControl *ctl, const vshCmd *cmd G_GNUC_UNUSED)
{
g_autofree char *cwd = g_get_current_dir();
vshPrint(ctl, _("%s\n"), cwd);
return true;
}
const vshCmdInfo info_quit[] = {
{.name = "help",
.data = N_("quit this interactive terminal")
},
{.name = "desc",
.data = ""
},
{.name = NULL}
};
bool
cmdQuit(vshControl *ctl, const vshCmd *cmd G_GNUC_UNUSED)
{
ctl->imode = false;
return true;
}
/* -----------------
* Command self-test
* ----------------- */
const vshCmdOptDef opts_selftest[] = {
{.name = "completers-missing",
.type = VSH_OT_BOOL,
.help = N_("output the list of options which are missing completers")
},
{.name = NULL}
};
const vshCmdInfo info_selftest[] = {
{.name = "help",
.data = N_("internal command for testing virt shells")
},
{.name = "desc",
.data = N_("internal use only")
},
{.name = NULL}
};
bool
cmdSelfTest(vshControl *ctl, const vshCmd *cmd)
{
const vshCmdGrp *grp;
const vshCmdDef *def;
bool completers = vshCommandOptBool(cmd, "completers-missing");
for (grp = cmdGroups; grp->name; grp++) {
for (def = grp->commands; def->name; def++) {
if (vshCmddefCheckInternals(ctl, def, completers) < 0)
return false;
}
}
return true;
}
/* ----------------------
* Autocompletion command
* ---------------------- */
const vshCmdOptDef opts_complete[] = {
{.name = "string",
.type = VSH_OT_ARGV,
.flags = VSH_OFLAG_EMPTY_OK,
.help = N_("partial string to autocomplete")
},
{.name = NULL}
};
const vshCmdInfo info_complete[] = {
{.name = "help",
.data = N_("internal command for autocompletion")
},
{.name = "desc",
.data = N_("internal use only")
},
{.name = NULL}
};
#ifdef WITH_READLINE
bool
cmdComplete(vshControl *ctl, const vshCmd *cmd)
{
const vshClientHooks *hooks = ctl->hooks;
int stdin_fileno = STDIN_FILENO;
const char *arg = "";
const vshCmdOpt *opt = NULL;
g_auto(GStrv) matches = NULL;
char **iter;
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
if (vshCommandOptStringQuiet(ctl, cmd, "string", &arg) <= 0)
return false;
/* This command is flagged VSH_CMD_FLAG_NOCONNECT because we
* need to prevent auth hooks reading any input. Therefore, we
* have to close stdin and then connect ourselves. */
VIR_FORCE_CLOSE(stdin_fileno);
if (!(hooks && hooks->connHandler && hooks->connHandler(ctl)))
return false;
while ((opt = vshCommandOptArgv(ctl, cmd, opt))) {
if (virBufferUse(&buf) != 0)
virBufferAddChar(&buf, ' ');
virBufferAddStr(&buf, opt->data);
arg = opt->data;
}
vshReadlineInit(ctl);
if (!(rl_line_buffer = virBufferContentAndReset(&buf)))
rl_line_buffer = g_strdup("");
/* rl_point is current cursor position in rl_line_buffer.
* In our case it's at the end of the whole line. */
rl_point = strlen(rl_line_buffer);
if (!(matches = vshReadlineCompletion(arg, 0, 0)))
return false;
for (iter = matches; *iter; iter++) {
if (iter == matches && matches[1])
continue;
printf("%s\n", *iter);
}
return true;
}
#else /* !WITH_READLINE */
bool
cmdComplete(vshControl *ctl G_GNUC_UNUSED,
const vshCmd *cmd G_GNUC_UNUSED)
{
return false;
}
#endif /* !WITH_READLINE */
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