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libvirt/tools/vsh.c
Peter Krempa 4f4c3b1397 vsh: Add helper for safe remembering of libvirt errors 
Avoid the annoying issue where the public object freeing APIs overwrite
the error set by helper functions, since they don't invoke the callback.

The new helper remembers the error only if no previous error was set.
2017-04-12 14:11:52 +02:00

3395 lines
88 KiB
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/*
* vsh.c: common data to be used by clients to exercise the libvirt API
*
* Copyright (C) 2005, 2007-2015 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/>.
*
* Daniel Veillard <veillard@redhat.com>
* Karel Zak <kzak@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*/
#include <config.h>
#include "vsh.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include "c-ctype.h"
#include <fcntl.h>
#include <time.h>
#include <limits.h>
#include <sys/stat.h>
#include <inttypes.h>
#include <signal.h>
#if WITH_READLINE
# include <readline/readline.h>
# include <readline/history.h>
#endif
#include "internal.h"
#include "virerror.h"
#include "virbuffer.h"
#include "viralloc.h"
#include <libvirt/libvirt-qemu.h>
#include <libvirt/libvirt-lxc.h>
#include "virfile.h"
#include "virthread.h"
#include "vircommand.h"
#include "conf/domain_conf.h"
#include "virtypedparam.h"
#include "virstring.h"
/* Gnulib doesn't guarantee SA_SIGINFO support. */
#ifndef SA_SIGINFO
# define SA_SIGINFO 0
#endif
#ifdef WITH_READLINE
/* For autocompletion */
void *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;
/* simple handler for oom conditions */
static void
vshErrorOOM(void)
{
fflush(stdout);
fputs(_("error: Out of memory\n"), stderr);
fflush(stderr);
exit(EXIT_FAILURE);
}
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);
}
void *
_vshMalloc(vshControl *ctl, size_t size, const char *filename, int line)
{
char *x;
if (VIR_ALLOC_N(x, size) == 0)
return x;
vshError(ctl, _("%s: %d: failed to allocate %d bytes"),
filename, line, (int) size);
exit(EXIT_FAILURE);
}
void *
_vshCalloc(vshControl *ctl, size_t nmemb, size_t size, const char *filename,
int line)
{
char *x;
if (!xalloc_oversized(nmemb, size) &&
VIR_ALLOC_N(x, nmemb * size) == 0)
return x;
vshError(ctl, _("%s: %d: failed to allocate %d bytes"),
filename, line, (int) (size*nmemb));
exit(EXIT_FAILURE);
}
char *
_vshStrdup(vshControl *ctl, const char *s, const char *filename, int line)
{
char *x;
if (VIR_STRDUP(x, s) >= 0)
return x;
vshError(ctl, _("%s: %d: failed to allocate %lu bytes"),
filename, line, (unsigned long)strlen(s));
exit(EXIT_FAILURE);
}
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 virStringListFree or a similar method.
*
* Returns the length of the filled array on success, or -1
* on error.
*/
int
vshStringToArray(const char *str,
char ***array)
{
char *str_copied = vshStrdup(NULL, str);
char *str_tok = NULL;
char *tmp;
unsigned int nstr_tokens = 0;
char **arr = NULL;
size_t len = strlen(str_copied);
/* tokenize the string from user and save its parts into an array */
nstr_tokens = 1;
/* count the delimiters, recognizing ,, as an escape for a
* literal comma */
str_tok = str_copied;
while ((str_tok = strchr(str_tok, ','))) {
if (str_tok[1] == ',')
str_tok++;
else
nstr_tokens++;
str_tok++;
}
/* reserve the NULL element at the end */
if (VIR_ALLOC_N(arr, nstr_tokens + 1) < 0) {
VIR_FREE(str_copied);
return -1;
}
/* tokenize the input string, while treating ,, as a literal comma */
nstr_tokens = 0;
tmp = str_tok = str_copied;
while ((tmp = strchr(tmp, ','))) {
if (tmp[1] == ',') {
memmove(&tmp[1], &tmp[2], len - (tmp - str_copied) - 2 + 1);
len--;
tmp++;
continue;
}
*tmp++ = '\0';
arr[nstr_tokens++] = vshStrdup(NULL, str_tok);
str_tok = tmp;
}
arr[nstr_tokens++] = vshStrdup(NULL, str_tok);
*array = arr;
VIR_FREE(str_copied);
return nstr_tokens;
}
virErrorPtr last_error;
/*
* Quieten libvirt until we're done with the command.
*/
void
vshErrorHandler(void *opaque ATTRIBUTE_UNUSED,
virErrorPtr error ATTRIBUTE_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 (!virGetLastError())
return;
vshSaveLibvirtError();
}
/*
* Reset libvirt error on graceful fallback paths
*/
void
vshResetLibvirtError(void)
{
virFreeError(last_error);
last_error = NULL;
}
/*
* 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(const vshCmdDef *cmd)
{
size_t i;
const char *help = NULL;
/* in order to perform the validation resolve the alias first */
if (cmd->flags & VSH_CMD_FLAG_ALIAS) {
if (!cmd->alias)
return -1;
cmd = vshCmddefSearch(cmd->alias);
}
/* Each command has to provide a non-empty help string. */
if (!(help = vshCmddefGetInfo(cmd, "help")) || !*help)
return -1;
if (!cmd->opts)
return 0;
for (i = 0; cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (i > 63)
return -1; /* too many options */
if (opt->type == VSH_OT_BOOL) {
if (opt->flags & VSH_OFLAG_REQ)
return -1; /* bool options can't be mandatory */
continue;
}
if (opt->type == VSH_OT_ALIAS) {
size_t j;
char *name = (char *)opt->help; /* cast away const */
char *p;
if (opt->flags || !opt->help)
return -1; /* alias options are tracked by the original name */
if ((p = strchr(name, '=')) &&
VIR_STRNDUP(name, name, p - name) < 0)
return -1;
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 (name != opt->help) {
VIR_FREE(name);
/* If alias comes with value, replacement must not be bool */
if (cmd->opts[j].type == VSH_OT_BOOL)
return -1;
}
if (!cmd->opts[j].name)
return -1; /* alias option must map to a later option name */
continue;
}
if (opt->type == VSH_OT_ARGV && cmd->opts[i + 1].name)
return -1; /* argv option must be listed last */
}
return 0;
}
/* Parse the options associated with @cmd, i.e. test whether options are
* required or need an argument.
*
* Returns -1 on error or 0 on success, filling the caller-provided bitmaps
* which keep track of required options and options needing an argument.
*/
static int
vshCmddefOptParse(const vshCmdDef *cmd, uint64_t *opts_need_arg,
uint64_t *opts_required)
{
size_t i;
bool optional = false;
*opts_need_arg = 0;
*opts_required = 0;
if (!cmd->opts)
return 0;
for (i = 0; cmd->opts[i].name; i++) {
const vshCmdOptDef *opt = &cmd->opts[i];
if (opt->type == VSH_OT_BOOL) {
optional = true;
continue;
}
if (opt->flags & VSH_OFLAG_REQ_OPT) {
if (opt->flags & VSH_OFLAG_REQ)
*opts_required |= 1ULL << i;
else
optional = true;
continue;
}
if (opt->type == VSH_OT_ALIAS)
continue; /* skip the alias option */
*opts_need_arg |= 1ULL << i;
if (opt->flags & VSH_OFLAG_REQ) {
if (optional && opt->type != VSH_OT_ARGV)
return -1; /* mandatory options must be listed first */
*opts_required |= 1ULL << i;
} else {
optional = true;
}
}
return 0;
}
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;
const vshCmdOptDef *ret = NULL;
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 */
sa_assert(!alias);
if (VIR_STRDUP(alias, opt->help) < 0)
goto cleanup;
name = alias;
if ((value = strchr(name, '='))) {
*value = '\0';
if (*optstr) {
if (report)
vshError(ctl, _("invalid '=' after option --%s"),
opt->name);
goto cleanup;
}
if (VIR_STRDUP(*optstr, value + 1) < 0)
goto cleanup;
}
continue;
}
if ((*opts_seen & (1ULL << i)) && opt->type != VSH_OT_ARGV) {
if (report)
vshError(ctl, _("option --%s already seen"), name);
goto cleanup;
}
*opts_seen |= 1ULL << i;
*opt_index = i;
ret = opt;
goto cleanup;
}
}
if (STRNEQ(cmd->name, "help") && report) {
vshError(ctl, _("command '%s' doesn't support option --%s"),
cmd->name, name);
}
cleanup:
VIR_FREE(alias);
return ret;
}
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 = 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 char *grpname)
{
const vshCmdGrp *grp = vshCmdGrpSearch(grpname);
const vshCmdDef *cmd = NULL;
if (!grp) {
vshError(ctl, _("command group '%s' doesn't exist"), grpname);
return false;
} else {
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)
continue;
vshPrint(ctl, " %-30s %s\n", cmd->name,
_(vshCmddefGetInfo(cmd, "help")));
}
}
return true;
}
bool
vshCmddefHelp(vshControl *ctl, const char *cmdname)
{
const vshCmdDef *def = vshCmddefSearch(cmdname);
const char *desc = NULL;
char buf[256];
uint64_t opts_need_arg;
uint64_t opts_required;
bool shortopt = false; /* true if 'arg' works instead of '--opt arg' */
if (!def) {
vshError(ctl, _("command '%s' doesn't exist"), cmdname);
return false;
}
if (vshCmddefOptParse(def, &opts_need_arg, &opts_required)) {
vshError(ctl, _("internal error: bad options in command: '%s'"),
def->name);
return false;
}
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) {
/* 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:
snprintf(buf, sizeof(buf), "--%s", opt->name);
break;
case VSH_OT_INT:
snprintf(buf, sizeof(buf),
(opt->flags & VSH_OFLAG_REQ) ? _("[--%s] <number>")
: _("--%s <number>"), opt->name);
break;
case VSH_OT_STRING:
/* OT_STRING should never be VSH_OFLAG_REQ */
if (opt->flags & VSH_OFLAG_REQ) {
vshError(ctl,
_("internal error: bad options in command: '%s'"),
def->name);
return false;
}
snprintf(buf, sizeof(buf), _("--%s <string>"), opt->name);
break;
case VSH_OT_DATA:
/* OT_DATA should always be VSH_OFLAG_REQ */
if (!(opt->flags & VSH_OFLAG_REQ)) {
vshError(ctl,
_("internal error: bad options in command: '%s'"),
def->name);
return false;
}
snprintf(buf, sizeof(buf), _("[--%s] <string>"),
opt->name);
break;
case VSH_OT_ARGV:
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;
VIR_FREE(tmp->data);
VIR_FREE(tmp);
}
}
static void
vshCommandFree(vshCmd *cmd)
{
vshCmd *c = cmd;
while (c) {
vshCmd *tmp = c;
c = c->next;
if (tmp->opts)
vshCommandOptFree(tmp->opts);
VIR_FREE(tmp);
}
}
/**
* 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). 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) {
assert(valid->name);
if (STREQ(name, valid->name))
break;
valid++;
}
assert(!needData || valid->type != VSH_OT_BOOL);
if (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 ATTRIBUTE_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->data && !(arg->def->flags & VSH_OFLAG_EMPTY_OK))
error = N_("Option argument is empty");
if (error) {
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 ATTRIBUTE_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) {
struct timeval before, after;
bool enable_timing = ctl->timing;
if (enable_timing)
GETTIMEOFDAY(&before);
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;
}
if (enable_timing)
GETTIMEOFDAY(&after);
/* 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.tv_sec - before.tv_sec) * 1000.0) +
((after.tv_usec - before.tv_usec) / 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;
/* vshCommandArgvGetArg() */
char **arg_pos;
char **arg_end;
};
static bool
vshCommandParse(vshControl *ctl, vshCommandParser *parser)
{
char *tkdata = NULL;
vshCmd *clast = NULL;
vshCmdOpt *first = NULL;
if (ctl->cmd) {
vshCommandFree(ctl->cmd);
ctl->cmd = NULL;
}
while (1) {
vshCmdOpt *last = NULL;
const vshCmdDef *cmd = NULL;
vshCommandToken tk;
bool data_only = false;
uint64_t opts_need_arg = 0;
uint64_t opts_required = 0;
uint64_t opts_seen = 0;
first = NULL;
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 */
if (!(cmd = vshCmddefSearch(tkdata))) {
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 = vshStrdup(ctl, cmd->alias);
cmd = vshCmddefSearch(tkdata);
}
if (vshCmddefOptParse(cmd, &opts_need_arg,
&opts_required) < 0) {
vshError(ctl,
_("internal error: bad options in command: '%s'"),
tkdata);
goto syntaxError;
}
VIR_FREE(tkdata);
} else if (data_only) {
goto get_data;
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
c_isalnum(tkdata[2])) {
char *optstr = strchr(tkdata + 2, '=');
size_t opt_index = 0;
if (optstr) {
*optstr = '\0'; /* convert the '=' to '\0' */
optstr = vshStrdup(ctl, optstr + 1);
}
/* Special case 'help' to ignore all spurious options */
if (!(opt = vshCmddefGetOption(ctl, cmd, tkdata + 2,
&opts_seen, &opt_index,
&optstr, true))) {
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, true);
if (tk == VSH_TK_ERROR)
goto syntaxError;
if (tk != VSH_TK_ARG) {
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) {
vshError(ctl, _("invalid '=' after option --%s"),
opt->name);
VIR_FREE(optstr);
goto syntaxError;
}
}
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
tkdata[2] == '\0') {
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")) {
vshError(ctl, _("unexpected data '%s'"), tkdata);
goto syntaxError;
}
}
if (opt) {
/* save option */
vshCmdOpt *arg = vshMalloc(ctl, sizeof(vshCmdOpt));
arg->def = opt;
arg->data = tkdata;
arg->next = NULL;
tkdata = NULL;
if (!first)
first = arg;
if (last)
last->next = arg;
last = arg;
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 = vshMalloc(ctl, sizeof(vshCmd));
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 = vshMalloc(ctl, sizeof(vshCmdOpt));
first->def = help->opts;
first->data = vshStrdup(ctl, cmd->name);
first->next = NULL;
cmd = help;
opts_required = 0;
opts_seen = 0;
break;
}
c->opts = first;
c->def = cmd;
c->next = NULL;
if (vshCommandCheckOpts(ctl, c, opts_required, opts_seen) < 0) {
VIR_FREE(c);
goto syntaxError;
}
if (!ctl->cmd)
ctl->cmd = c;
if (clast)
clast->next = c;
clast = c;
}
if (tk == VSH_TK_END)
break;
}
return true;
syntaxError:
if (ctl->cmd) {
vshCommandFree(ctl->cmd);
ctl->cmd = NULL;
}
if (first)
vshCommandOptFree(first);
VIR_FREE(tkdata);
return false;
}
/* --------------------
* Command argv parsing
* --------------------
*/
static vshCommandToken ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
vshCommandArgvGetArg(vshControl *ctl, vshCommandParser *parser, char **res,
bool report ATTRIBUTE_UNUSED)
{
if (parser->arg_pos == parser->arg_end) {
*res = NULL;
return VSH_TK_END;
}
*res = vshStrdup(ctl, *parser->arg_pos);
parser->arg_pos++;
return VSH_TK_ARG;
}
bool
vshCommandArgvParse(vshControl *ctl, int nargs, char **argv)
{
vshCommandParser parser;
if (nargs <= 0)
return false;
parser.arg_pos = argv;
parser.arg_end = argv + nargs;
parser.getNextArg = vshCommandArgvGetArg;
return vshCommandParse(ctl, &parser);
}
/* ----------------------
* 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;
int sz = 0;
char *p = parser->pos;
char *q = vshStrdup(ctl, p);
*res = q;
while (*p && (*p == ' ' || *p == '\t'))
p++;
if (*p == '\0')
return VSH_TK_END;
if (*p == ';') {
parser->pos = ++p; /* = \0 or begin of next command */
return VSH_TK_SUBCMD_END;
}
while (*p) {
/* end of token is blank space or ';' */
if (!double_quote && !single_quote &&
(*p == ' ' || *p == '\t' || *p == ';'))
break;
if (!double_quote && *p == '\'') { /* single quote */
single_quote = !single_quote;
p++;
continue;
} else if (!single_quote && *p == '\\') { /* escape */
/*
* The same as the bash, 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 (!single_quote && *p == '"') { /* double quote */
double_quote = !double_quote;
p++;
continue;
}
*q++ = *p++;
sz++;
}
if (double_quote) {
if (report)
vshError(ctl, "%s", _("missing \""));
return VSH_TK_ERROR;
}
*q = '\0';
parser->pos = p;
return VSH_TK_ARG;
}
bool
vshCommandStringParse(vshControl *ctl, char *cmdstr)
{
vshCommandParser parser;
if (cmdstr == NULL || *cmdstr == '\0')
return false;
parser.pos = cmdstr;
parser.getNextArg = vshCommandStringGetArg;
return vshCommandParse(ctl, &parser);
}
/**
* 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
* if we are out of memory. */
char *
vshGetTypedParamValue(vshControl *ctl, virTypedParameterPtr item)
{
int ret = 0;
char *str = NULL;
switch (item->type) {
case VIR_TYPED_PARAM_INT:
ret = virAsprintf(&str, "%d", item->value.i);
break;
case VIR_TYPED_PARAM_UINT:
ret = virAsprintf(&str, "%u", item->value.ui);
break;
case VIR_TYPED_PARAM_LLONG:
ret = virAsprintf(&str, "%lld", item->value.l);
break;
case VIR_TYPED_PARAM_ULLONG:
ret = virAsprintf(&str, "%llu", item->value.ul);
break;
case VIR_TYPED_PARAM_DOUBLE:
ret = virAsprintf(&str, "%f", item->value.d);
break;
case VIR_TYPED_PARAM_BOOLEAN:
str = vshStrdup(ctl, item->value.b ? _("yes") : _("no"));
break;
case VIR_TYPED_PARAM_STRING:
str = vshStrdup(ctl, item->value.s);
break;
default:
vshError(ctl, _("unimplemented parameter type %d"), item->type);
}
if (ret < 0) {
vshError(ctl, "%s", _("Out of memory"));
exit(EXIT_FAILURE);
}
return str;
}
void
vshDebug(vshControl *ctl, int level, const char *format, ...)
{
va_list ap;
char *str;
/* 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);
if (virVasprintf(&str, format, ap) < 0) {
/* Skip debug messages on low memory */
va_end(ap);
return;
}
va_end(ap);
fputs(str, stdout);
VIR_FREE(str);
}
void
vshPrintExtra(vshControl *ctl, const char *format, ...)
{
va_list ap;
char *str;
if (ctl && ctl->quiet)
return;
va_start(ap, format);
if (virVasprintfQuiet(&str, format, ap) < 0)
vshErrorOOM();
va_end(ap);
fputs(str, stdout);
VIR_FREE(str);
}
void
vshPrint(vshControl *ctl ATTRIBUTE_UNUSED, const char *format, ...)
{
va_list ap;
char *str;
va_start(ap, format);
if (virVasprintfQuiet(&str, format, ap) < 0)
vshErrorOOM();
va_end(ap);
fputs(str, stdout);
VIR_FREE(str);
}
bool
vshTTYIsInterruptCharacter(vshControl *ctl ATTRIBUTE_UNUSED,
const char chr ATTRIBUTE_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 ATTRIBUTE_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 ATTRIBUTE_UNUSED)
{
#ifndef WIN32
if (!ctl->istty)
return 0;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &ctl->termattr) < 0)
return -1;
#endif
return 0;
}
#if !defined(WIN32) && !defined(HAVE_CFMAKERAW)
/* provide fallback in case cfmakeraw isn't available */
static void
cfmakeraw(struct termios *attr)
{
attr->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
| INLCR | IGNCR | ICRNL | IXON);
attr->c_oflag &= ~OPOST;
attr->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
attr->c_cflag &= ~(CSIZE | PARENB);
attr->c_cflag |= CS8;
}
#endif /* !WIN32 && !HAVE_CFMAKERAW */
int
vshTTYMakeRaw(vshControl *ctl ATTRIBUTE_UNUSED,
bool report_errors ATTRIBUTE_UNUSED)
{
#ifndef WIN32
struct termios rawattr = ctl->termattr;
char ebuf[1024];
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"),
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
#endif
return 0;
}
void
vshError(vshControl *ctl, const char *format, ...)
{
va_list ap;
char *str;
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);
/* We can't recursively call vshError on an OOM situation, so ignore
failure here. */
ignore_value(virVasprintf(&str, format, ap));
va_end(ap);
fprintf(stderr, "%s\n", NULLSTR(str));
fflush(stderr);
VIR_FREE(str);
}
void
vshEventLoop(void *opaque)
{
vshControl *ctl = opaque;
while (1) {
bool quit;
virMutexLock(&ctl->lock);
quit = ctl->quit;
virMutexUnlock(&ctl->lock);
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. */
static int vshEventFd = -1;
static struct sigaction vshEventOldAction;
/* Signal handler installed in vshEventStart, removed in vshEventCleanup. */
static void
vshEventInt(int sig ATTRIBUTE_UNUSED,
siginfo_t *siginfo ATTRIBUTE_UNUSED,
void *context ATTRIBUTE_UNUSED)
{
char reason = VSH_EVENT_INTERRUPT;
if (vshEventFd >= 0)
ignore_value(safewrite(vshEventFd, &reason, 1));
}
/* Event loop handler used to limit length of waiting for any other event. */
void
vshEventTimeout(int timer ATTRIBUTE_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)
{
struct sigaction action;
assert(ctl->eventPipe[0] == -1 && ctl->eventPipe[1] == -1 &&
vshEventFd == -1 && ctl->eventTimerId >= 0);
if (pipe2(ctl->eventPipe, O_CLOEXEC) < 0) {
char ebuf[1024];
vshError(ctl, _("failed to create pipe: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
return -1;
}
vshEventFd = ctl->eventPipe[1];
action.sa_sigaction = vshEventInt;
action.sa_flags = SA_SIGINFO;
sigemptyset(&action.sa_mask);
sigaction(SIGINT, &action, &vshEventOldAction);
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) {
char ebuf[1024];
if (!rv)
errno = EPIPE;
vshError(ctl, _("failed to determine loop exit status: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
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)
{
if (vshEventFd >= 0) {
sigaction(SIGINT, &vshEventOldAction, NULL);
vshEventFd = -1;
}
VIR_FORCE_CLOSE(ctl->eventPipe[0]);
VIR_FORCE_CLOSE(ctl->eventPipe[1]);
virEventUpdateTimeout(ctl->eventTimerId, -1);
}
#define LOGFILE_FLAGS (O_WRONLY | O_APPEND | O_CREAT | O_SYNC)
/**
* 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)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
char *str = NULL;
size_t len;
const char *lvl = "";
time_t stTime;
struct tm stTm;
if (ctl->log_fd == -1)
return;
/**
* create log format
*
* [YYYY.MM.DD HH:MM:SS SIGNATURE PID] LOG_LEVEL message
*/
time(&stTime);
localtime_r(&stTime, &stTm);
virBufferAsprintf(&buf, "[%d.%02d.%02d %02d:%02d:%02d %s %d] ",
(1900 + stTm.tm_year),
(1 + stTm.tm_mon),
stTm.tm_mday,
stTm.tm_hour,
stTm.tm_min,
stTm.tm_sec,
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", -1);
virBufferAddChar(&buf, '\n');
if (virBufferError(&buf))
goto error;
str = virBufferContentAndReset(&buf);
len = strlen(str);
/* write log */
if (safewrite(ctl->log_fd, str, len) < 0)
goto error;
VIR_FREE(str);
return;
error:
vshCloseLogFile(ctl);
vshError(ctl, "%s", _("failed to write the log file"));
virBufferFreeAndReset(&buf);
VIR_FREE(str);
}
/**
* vshCloseLogFile:
*
* Close log file.
*/
void
vshCloseLogFile(vshControl *ctl)
{
char ebuf[1024];
/* log file close */
if (VIR_CLOSE(ctl->log_fd) < 0) {
vshError(ctl, _("%s: failed to write log file: %s"),
ctl->logfile ? ctl->logfile : "?",
virStrerror(errno, ebuf, sizeof(ebuf)));
}
if (ctl->logfile) {
VIR_FREE(ctl->logfile);
ctl->logfile = NULL;
}
}
#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 = c_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 ATTRIBUTE_UNUSED,
bool relax_avail ATTRIBUTE_UNUSED)
{
vshDebug(ctl, VSH_ERR_WARNING, "%s", _("This function is not "
"supported on WIN32 platform"));
return 0;
}
#endif /* WIN32 */
/* Common code for the edit / net-edit / pool-edit functions which follow. */
char *
vshEditWriteToTempFile(vshControl *ctl, const char *doc)
{
char *ret;
const char *tmpdir;
int fd;
char ebuf[1024];
tmpdir = virGetEnvBlockSUID("TMPDIR");
if (!tmpdir) tmpdir = "/tmp";
if (virAsprintf(&ret, "%s/virshXXXXXX.xml", tmpdir) < 0) {
vshError(ctl, "%s", _("out of memory"));
return NULL;
}
fd = mkostemps(ret, 4, O_CLOEXEC);
if (fd == -1) {
vshError(ctl, _("mkostemps: failed to create temporary file: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
VIR_FREE(ret);
return NULL;
}
if (safewrite(fd, doc, strlen(doc)) == -1) {
vshError(ctl, _("write: %s: failed to write to temporary file: %s"),
ret, virStrerror(errno, ebuf, sizeof(ebuf)));
VIR_FORCE_CLOSE(fd);
unlink(ret);
VIR_FREE(ret);
return NULL;
}
if (VIR_CLOSE(fd) < 0) {
vshError(ctl, _("close: %s: failed to write or close temporary file: %s"),
ret, virStrerror(errno, ebuf, sizeof(ebuf)));
unlink(ret);
VIR_FREE(ret);
return NULL;
}
/* Temporary filename: caller frees. */
return ret;
}
/* Characters permitted in $EDITOR environment variable and temp filename. */
#define ACCEPTED_CHARS \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/_.:@"
int
vshEditFile(vshControl *ctl, const char *filename)
{
const char *editor;
virCommandPtr cmd;
int ret = -1;
int outfd = STDOUT_FILENO;
int errfd = STDERR_FILENO;
editor = virGetEnvBlockSUID("VISUAL");
if (!editor)
editor = virGetEnvBlockSUID("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);
goto cleanup;
}
ret = 0;
cleanup:
virCommandFree(cmd);
return ret;
}
char *
vshEditReadBackFile(vshControl *ctl, const char *filename)
{
char *ret;
char ebuf[1024];
if (virFileReadAll(filename, VSH_MAX_XML_FILE, &ret) == -1) {
vshError(ctl,
_("%s: failed to read temporary file: %s"),
filename, virStrerror(errno, ebuf, sizeof(ebuf)));
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,
virBufferPtr indent)
{
size_t i;
int nextlastdev = -1;
int ret = -1;
const char *dev = (lookup)(devid, false, opaque);
if (virBufferError(indent))
goto cleanup;
/* 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, ' ');
if (virBufferError(indent))
goto cleanup;
}
/* 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, " ");
if (virBufferError(indent))
goto cleanup;
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)
goto cleanup;
}
virBufferTrim(indent, " ", -1);
/* 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)
virBufferTrim(indent, NULL, 2);
ret = 0;
cleanup:
return ret;
}
int
vshTreePrint(vshControl *ctl, vshTreeLookup lookup, void *opaque,
int num_devices, int devid)
{
int ret;
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"));
virBufferFreeAndReset(&indent);
return ret;
}
#if WITH_READLINE
/* -----------------
* Readline stuff
* -----------------
*/
/*
* Generator function for command completion. STATE lets us
* know whether to start from scratch; without any state
* (i.e. STATE == 0), then we start at the top of the list.
*/
static char *
vshReadlineCommandGenerator(const char *text, int state)
{
static unsigned int grp_list_index, cmd_list_index;
static size_t len;
const char *name;
const vshCmdGrp *grp;
const vshCmdDef *cmds;
if (!state) {
grp_list_index = 0;
cmd_list_index = 0;
len = strlen(text);
}
grp = cmdGroups;
/* Return the next name which partially matches from the
* command list.
*/
while (grp[grp_list_index].name) {
cmds = grp[grp_list_index].commands;
if (cmds[cmd_list_index].name) {
while ((name = cmds[cmd_list_index].name)) {
if (cmds[cmd_list_index++].flags & VSH_CMD_FLAG_ALIAS)
continue;
if (STREQLEN(name, text, len))
return vshStrdup(NULL, name);
}
} else {
cmd_list_index = 0;
grp_list_index++;
}
}
/* If no names matched, then return NULL. */
return NULL;
}
static char *
vshReadlineOptionsGenerator(const char *text, int state, const vshCmdDef *cmd_parsed)
{
static unsigned int list_index;
static size_t len;
static const vshCmdDef *cmd;
const char *name;
if (!state) {
cmd = cmd_parsed;
list_index = 0;
len = strlen(text);
}
if (!cmd)
return NULL;
if (!cmd->opts)
return NULL;
while ((name = cmd->opts[list_index].name)) {
char *res;
list_index++;
if (len > 2) {
/* provide auto-complete only when the text starts with -- */
if (STRNEQLEN(text, "--", 2))
return NULL;
if (STRNEQLEN(name, text + 2, len - 2))
continue;
} else if (STRNEQLEN(text, "--", len)) {
return NULL;
}
res = vshMalloc(NULL, strlen(name) + 3);
snprintf(res, strlen(name) + 3, "--%s", name);
return res;
}
/* If no names matched, then return NULL. */
return NULL;
}
static char *
vshReadlineParse(const char *text, int state)
{
static vshCommandParser parser, sanitizer;
vshCommandToken tk;
static const vshCmdDef *cmd;
const vshCmdOptDef *opt = NULL;
char *tkdata, *optstr, *const_tkdata, *completed_name;
char *res = NULL;
static char *ctext, *sanitized_text;
static char **completed_list;
static unsigned int completed_list_index;
static uint64_t const_opts_need_arg, const_opts_required, const_opts_seen;
uint64_t opts_seen;
size_t opt_index;
static bool cmd_exists, opts_filled, opt_exists;
static bool non_bool_opt_exists, data_complete;
if (!state) {
parser.pos = rl_line_buffer;
parser.getNextArg = vshCommandStringGetArg;
ctext = vshStrdup(NULL, text);
sanitizer.pos = ctext;
sanitizer.getNextArg = vshCommandStringGetArg;
const_tkdata = NULL;
tkdata = NULL;
sanitized_text = NULL;
optstr = NULL;
completed_list = NULL;
completed_list_index = 0;
/* Sanitize/de-quote the autocomplete text */
tk = sanitizer.getNextArg(NULL, &sanitizer, &sanitized_text, false);
/* No autocomplete if sanitized text is a token error or token end */
if (tk == VSH_TK_ERROR)
goto error;
tk = parser.getNextArg(NULL, &parser, &const_tkdata, false);
if (tk == VSH_TK_ERROR)
goto error;
/* Free-ing purposes */
tkdata = const_tkdata;
/* Skip leading space */
virSkipSpaces((const char**)&tkdata);
/* Handle ';'s */
while (tk == VSH_TK_SUBCMD_END) {
tk = parser.getNextArg(NULL, &parser, &const_tkdata, false);
tkdata = const_tkdata;
}
/* Skip trailing space after ;*/
virSkipSpaces((const char**)&tkdata);
cmd_exists = false;
opts_filled = false;
non_bool_opt_exists = false;
data_complete = false;
const_opts_need_arg = 0;
const_opts_required = 0;
const_opts_seen = 0;
opt_index = 0;
cmd = NULL;
opt = NULL;
/* Parse till text to be auto-completed is reached */
while (STRNEQ(tkdata, sanitized_text)) {
if (!cmd) {
if (!(cmd = vshCmddefSearch(tkdata)))
goto error;
if (cmd->flags & VSH_CMD_FLAG_ALIAS)
cmd = vshCmddefSearch(cmd->alias);
cmd_exists = true;
if (vshCmddefOptParse(cmd, &const_opts_need_arg,
&const_opts_required) < 0)
goto error;
opts_seen = const_opts_seen;
opts_filled = true;
} else if (tkdata[0] == '-' && tkdata[1] == '-' &&
c_isalnum(tkdata[2])) {
/* Command retrieved successfully, move to options */
optstr = strchr(tkdata + 2, '=');
opt_index = 0;
if (optstr) {
*optstr = '\0';
optstr = vshStrdup(NULL, optstr + 1);
}
if (!(opt = vshCmddefGetOption(NULL, cmd, tkdata + 2,
&opts_seen, &opt_index,
&optstr, false))) {
/* Parsing failed wrt autocomplete */
VIR_FREE(optstr);
goto error;
}
opts_seen = const_opts_seen;
opt_exists = true;
VIR_FREE(const_tkdata);
if (opt->type != VSH_OT_BOOL) {
non_bool_opt_exists = true;
/* Opt exists and check for option data */
if (optstr) {
const_tkdata = optstr;
tkdata = const_tkdata;
} else {
VIR_FREE(const_tkdata);
tk = parser.getNextArg(NULL, &parser, &const_tkdata,
false);
if (tk == VSH_TK_ERROR)
goto error;
tkdata = const_tkdata;
virSkipSpaces((const char **)&tkdata);
}
if (STREQ(tkdata, sanitized_text)) {
/* auto-complete non-bool option arg */
data_complete = true;
break;
}
non_bool_opt_exists = false;
} else {
tkdata = NULL;
/* opt type is BOOL */
if (optstr) {
VIR_FREE(optstr);
goto error;
}
}
} else if (!opt_exists) {
/* No -- option provided and some other token given
* Try to find the default option.
*/
if (!(opt = vshCmddefGetData(cmd, &const_opts_need_arg,
&const_opts_seen))
|| opt->type == VSH_OT_BOOL)
goto error;
opt_exists = true;
opts_seen = const_opts_seen;
} else {
/* In every other case, return NULL */
goto error;
}
VIR_FREE(const_tkdata);
tk = parser.getNextArg(NULL, &parser, &const_tkdata, false);
if (tk == VSH_TK_ERROR)
goto error;
while (tk == VSH_TK_SUBCMD_END) {
cmd = NULL;
cmd_exists = false;
opts_filled = false;
opt = NULL;
non_bool_opt_exists = false;
tk = parser.getNextArg(NULL, &parser, &const_tkdata, false);
}
tkdata = const_tkdata;
virSkipSpaces((const char**)&tkdata);
}
VIR_FREE(const_tkdata);
}
if (!cmd_exists) {
res = vshReadlineCommandGenerator(sanitized_text, state);
} else if (opts_filled && !non_bool_opt_exists) {
res = vshReadlineOptionsGenerator(sanitized_text, state, cmd);
} else if (non_bool_opt_exists && data_complete && opt && opt->completer) {
if (!completed_list)
completed_list = opt->completer(autoCompleteOpaque,
opt->completer_flags);
if (completed_list) {
while ((completed_name = completed_list[completed_list_index])) {
completed_list_index++;
if (!STRPREFIX(completed_name, sanitized_text))
continue;
res = vshStrdup(NULL, completed_name);
return res;
}
res = NULL;
virStringListFree(completed_list);
completed_list_index = 0;
}
}
if (!res) {
VIR_FREE(sanitized_text);
VIR_FREE(ctext);
}
return res;
error:
VIR_FREE(const_tkdata);
VIR_FREE(sanitized_text);
VIR_FREE(ctext);
return NULL;
}
static char **
vshReadlineCompletion(const char *text,
int start ATTRIBUTE_UNUSED,
int end ATTRIBUTE_UNUSED)
{
char **matches = (char **) NULL;
matches = rl_completion_matches(text, vshReadlineParse);
return matches;
}
# define HISTSIZE_MAX 500000
static int
vshReadlineInit(vshControl *ctl)
{
char *userdir = NULL;
int max_history = 500;
int ret = -1;
char *histsize_env = NULL;
const char *histsize_str = NULL;
/* Opaque data for autocomplete callbacks. */
autoCompleteOpaque = ctl;
/* Allow conditional parsing of the ~/.inputrc file.
* Work around ancient readline 4.1 (hello Mac OS X),
* which declared it as 'char *' instead of 'const char *'.
*/
rl_readline_name = ctl->name;
/* Tell the completer that we want a crack first. */
rl_attempted_completion_function = vshReadlineCompletion;
rl_basic_word_break_characters = " \t\n\\`@$><=;|&{(";
if (virAsprintf(&histsize_env, "%s_HISTSIZE", ctl->env_prefix) < 0)
goto cleanup;
/* Limit the total size of the history buffer */
if ((histsize_str = virGetEnvBlockSUID(histsize_env))) {
if (virStrToLong_i(histsize_str, NULL, 10, &max_history) < 0) {
vshError(ctl, _("Bad $%s value."), histsize_env);
goto cleanup;
} else if (max_history > HISTSIZE_MAX || max_history < 0) {
vshError(ctl, _("$%s value should be between 0 "
"and %d"),
histsize_env, HISTSIZE_MAX);
goto cleanup;
}
}
stifle_history(max_history);
/* Prepare to read/write history from/to the
* $XDG_CACHE_HOME/virtshell/history file
*/
userdir = virGetUserCacheDirectory();
if (userdir == NULL) {
vshError(ctl, "%s", _("Could not determine home directory"));
goto cleanup;
}
if (virAsprintf(&ctl->historydir, "%s/%s", userdir, ctl->name) < 0) {
vshError(ctl, "%s", _("Out of memory"));
goto cleanup;
}
if (virAsprintf(&ctl->historyfile, "%s/history", ctl->historydir) < 0) {
vshError(ctl, "%s", _("Out of memory"));
goto cleanup;
}
read_history(ctl->historyfile);
ret = 0;
cleanup:
VIR_FREE(userdir);
VIR_FREE(histsize_env);
return ret;
}
static void
vshReadlineDeinit(vshControl *ctl)
{
if (ctl->historyfile != NULL) {
if (virFileMakePathWithMode(ctl->historydir, 0755) < 0 &&
errno != EEXIST) {
char ebuf[1024];
vshError(ctl, _("Failed to create '%s': %s"),
ctl->historydir, virStrerror(errno, ebuf, sizeof(ebuf)));
} else {
write_history(ctl->historyfile);
}
}
VIR_FREE(ctl->historydir);
VIR_FREE(ctl->historyfile);
}
char *
vshReadline(vshControl *ctl ATTRIBUTE_UNUSED, const char *prompt)
{
return readline(prompt);
}
#else /* !WITH_READLINE */
static int
vshReadlineInit(vshControl *ctl ATTRIBUTE_UNUSED)
{
/* empty */
return 0;
}
static void
vshReadlineDeinit(vshControl *ctl ATTRIBUTE_UNUSED)
{
/* empty */
}
char *
vshReadline(vshControl *ctl, const char *prompt)
{
char line[1024];
char *r;
int len;
fputs(prompt, 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 vshStrdup(ctl, r);
}
#endif /* !WITH_READLINE */
/*
* Initialize debug settings.
*/
static int
vshInitDebug(vshControl *ctl)
{
const char *debugEnv;
char *env = NULL;
if (ctl->debug == VSH_DEBUG_DEFAULT) {
if (virAsprintf(&env, "%s_DEBUG", ctl->env_prefix) < 0)
return -1;
/* log level not set from commandline, check env variable */
debugEnv = virGetEnvAllowSUID(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;
}
}
VIR_FREE(env);
}
if (ctl->logfile == NULL) {
if (virAsprintf(&env, "%s_LOG_FILE", ctl->env_prefix) < 0)
return -1;
/* log file not set from cmdline */
debugEnv = virGetEnvBlockSUID(env);
if (debugEnv && *debugEnv) {
ctl->logfile = vshStrdup(ctl, debugEnv);
vshOpenLogFile(ctl);
}
VIR_FREE(env);
}
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
* -----------------------------------------------
*/
const vshCmdOptDef opts_help[] = {
{.name = "command",
.type = VSH_OT_STRING,
.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 char *name = NULL;
if (vshCommandOptStringQuiet(ctl, cmd, "command", &name) <= 0) {
const vshCmdGrp *grp;
const vshCmdDef *def;
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)
continue;
vshPrint(ctl, " %-30s %s\n", def->name,
_(vshCmddefGetInfo(def, "help")));
}
vshPrint(ctl, "\n");
}
return true;
}
if (vshCmddefSearch(name)) {
return vshCmddefHelp(ctl, name);
} else if (vshCmdGrpSearch(name)) {
return vshCmdGrpHelp(ctl, name);
} 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;
char *dir_malloced = NULL;
bool ret = true;
char ebuf[1024];
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"),
virStrerror(errno, ebuf, sizeof(ebuf)), dir);
ret = false;
}
VIR_FREE(dir_malloced);
return ret;
}
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 = "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")
},
{.name = "desc",
.data = N_("Echo back arguments, possibly with quoting.")
},
{.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 = false;
bool xml = false;
int count = 0;
const vshCmdOpt *opt = NULL;
char *arg;
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (vshCommandOptBool(cmd, "shell"))
shell = true;
if (vshCommandOptBool(cmd, "xml"))
xml = true;
while ((opt = vshCommandOptArgv(ctl, cmd, opt))) {
char *str;
virBuffer xmlbuf = VIR_BUFFER_INITIALIZER;
arg = opt->data;
if (count)
virBufferAddChar(&buf, ' ');
if (xml) {
virBufferEscapeString(&xmlbuf, "%s", arg);
if (virBufferError(&xmlbuf)) {
vshError(ctl, "%s", _("Failed to allocate XML buffer"));
return false;
}
str = virBufferContentAndReset(&xmlbuf);
} else {
str = vshStrdup(ctl, arg);
}
if (shell)
virBufferEscapeShell(&buf, str);
else
virBufferAdd(&buf, str, -1);
count++;
VIR_FREE(str);
}
if (virBufferError(&buf)) {
vshError(ctl, "%s", _("Failed to allocate XML buffer"));
return false;
}
arg = virBufferContentAndReset(&buf);
if (arg)
vshPrint(ctl, "%s", arg);
VIR_FREE(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 ATTRIBUTE_UNUSED)
{
char *cwd;
bool ret = true;
char ebuf[1024];
cwd = getcwd(NULL, 0);
if (!cwd) {
vshError(ctl, _("pwd: cannot get current directory: %s"),
virStrerror(errno, ebuf, sizeof(ebuf)));
ret = false;
} else {
vshPrint(ctl, _("%s\n"), cwd);
VIR_FREE(cwd);
}
return ret;
}
const vshCmdInfo info_quit[] = {
{.name = "help",
.data = N_("quit this interactive terminal")
},
{.name = "desc",
.data = ""
},
{.name = NULL}
};
bool
cmdQuit(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
{
ctl->imode = false;
return true;
}
/* -----------------
* Command self-test
* ----------------- */
const vshCmdInfo info_selftest[] = {
{.name = "help",
.data = N_("internal command for testing virt shells")
},
{.name = "desc",
.data = N_("internal use only")
},
{.name = NULL}
};
/* Prints help for every command.
* That runs vshCmddefOptParse which validates
* the per-command options structure. */
bool
cmdSelfTest(vshControl *ctl ATTRIBUTE_UNUSED,
const vshCmd *cmd ATTRIBUTE_UNUSED)
{
const vshCmdGrp *grp;
const vshCmdDef *def;
for (grp = cmdGroups; grp->name; grp++) {
for (def = grp->commands; def->name; def++) {
if (vshCmddefCheckInternals(def) < 0)
return false;
}
}
return true;
}
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