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libvirt/tools/vsh.c

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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 <sys/time.h>
#include "c-ctype.h"
#include <fcntl.h>
#include <time.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 "virfile.h"
#include "virthread.h"
#include "vircommand.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 */
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;
/* 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 (virGetLastErrorCode() == VIR_ERR_OK)
return;
vshSaveLibvirtError();
}
/*
* Reset libvirt error on graceful fallback paths
*/
void
vshResetLibvirtError(void)
{
virFreeError(last_error);
last_error = NULL;
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)
{
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) {
vshError(ctl, _("command '%s' has inconsistent alias"), cmd->name);
return -1;
}
cmd = vshCmddefSearch(cmd->alias);
}
/* 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 */
}
switch (opt->type) {
case VSH_OT_STRING:
case VSH_OT_BOOL:
if (opt->flags & VSH_OFLAG_REQ) {
vshError(ctl, _("command '%s' misused VSH_OFLAG_REQ"),
cmd->name);
return -1; /* neither bool nor string options can be mandatory */
}
break;
case VSH_OT_ALIAS: {
size_t j;
char *name = (char *)opt->help; /* cast away const */
char *p;
if (opt->flags || !opt->help) {
vshError(ctl, _("command '%s' has incorrect alias option"),
cmd->name);
return -1; /* alias options are tracked by the original name */
}
if ((p = strchr(name, '=')) &&
VIR_STRNDUP(name, name, p - name) < 0)
vshErrorOOM();
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) {
vshError(ctl, _("command '%s' has mismatched alias type"),
cmd->name);
return -1;
}
}
if (!cmd->opts[j].name) {
vshError(ctl, _("command '%s' has missing alias option"),
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, _("command '%s' does not list argv option last"),
cmd->name);
return -1; /* argv option must be listed last */
}
break;
case VSH_OT_DATA:
if (!(opt->flags & VSH_OFLAG_REQ)) {
vshError(ctl, _("command '%s' has non-required VSH_OT_DATA"),
cmd->name);
return -1; /* OT_DATA should always be required. */
}
break;
case VSH_OT_INT:
break;
}
}
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 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)
continue;
vshPrint(ctl, " %-30s %s\n", cmd->name,
_(vshCmddefGetInfo(cmd, "help")));
}
return true;
}
bool
vshCmddefHelp(vshControl *ctl, const vshCmdDef *def)
{
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 (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:
snprintf(buf, sizeof(buf), _("--%s <string>"), opt->name);
break;
case VSH_OT_DATA:
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;
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) 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 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) {
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 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, vshCmd **partial)
{
char *tkdata = NULL;
vshCmd *clast = NULL;
vshCmdOpt *first = NULL;
const vshCmdDef *cmd = NULL;
if (!partial) {
vshCommandFree(ctl->cmd);
ctl->cmd = NULL;
}
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) {
vshCommandFree(*partial);
*partial = 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 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 = vshStrdup(ctl, cmd->alias);
cmd = vshCmddefSearch(tkdata);
}
if (vshCmddefOptParse(cmd, &opts_need_arg,
&opts_required) < 0) {
if (!partial)
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, 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, true);
if (tk == VSH_TK_ERROR)
goto syntaxError;
if (tk != VSH_TK_ARG) {
if (partial) {
vshCmdOpt *arg = vshMalloc(ctl, sizeof(vshCmdOpt));
arg->def = opt;
arg->data = tkdata;
tkdata = NULL;
arg->next = NULL;
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 = 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;
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 = 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;
first = NULL;
if (!partial &&
vshCommandCheckOpts(ctl, c, opts_required, opts_seen) < 0) {
VIR_FREE(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 = vshMalloc(ctl, sizeof(*tmp));
tmp->opts = first;
tmp->def = cmd;
*partial = tmp;
} else {
vshCommandFree(ctl->cmd);
ctl->cmd = NULL;
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, 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;
int sz = 0;
char *p = parser->pos;
char *q = vshStrdup(ctl, 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++;
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, vshCmd **partial)
{
vshCommandParser parser;
if (cmdstr == NULL || *cmdstr == '\0')
return false;
parser.pos = cmdstr;
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
* 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 = getenv("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 = 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);
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
* -----------------
*/
/**
* vshReadlineCommandGenerator:
* @text: optional command prefix
*
* Generator function for command completion.
*
* Returns a string list of commands with @text prefix,
* NULL if there's no such command.
*/
static char **
vshReadlineCommandGenerator(const char *text)
{
size_t grp_list_index = 0, cmd_list_index = 0;
size_t len = strlen(text);
const char *name;
const vshCmdGrp *grp;
const vshCmdDef *cmds;
size_t ret_size = 0;
char **ret = NULL;
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)) {
if (VIR_REALLOC_N(ret, ret_size + 2) < 0) {
virStringListFree(ret);
return NULL;
}
ret[ret_size] = vshStrdup(NULL, name);
ret_size++;
/* Terminate the string list properly. */
ret[ret_size] = NULL;
}
}
} else {
cmd_list_index = 0;
grp_list_index++;
}
}
return ret;
}
static char **
vshReadlineOptionsGenerator(const char *text,
const vshCmdDef *cmd,
vshCmd *last)
{
size_t list_index = 0;
size_t len = strlen(text);
const char *name;
size_t ret_size = 0;
char **ret = NULL;
if (!cmd)
return NULL;
if (!cmd->opts)
return NULL;
while ((name = cmd->opts[list_index].name)) {
bool exists = false;
vshCmdOpt *opt = last->opts;
size_t name_len;
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;
}
while (opt) {
if (STREQ(opt->def->name, name) && opt->def->type != VSH_OT_ARGV) {
exists = true;
break;
}
opt = opt->next;
}
if (exists)
continue;
if (VIR_REALLOC_N(ret, ret_size + 2) < 0) {
virStringListFree(ret);
return NULL;
}
name_len = strlen(name);
ret[ret_size] = vshMalloc(NULL, name_len + 3);
snprintf(ret[ret_size], name_len + 3, "--%s", name);
ret_size++;
/* Terminate the string list properly. */
ret[ret_size] = NULL;
}
return ret;
}
static const vshCmdOptDef *
vshReadlineCommandFindOpt(const vshCmd *partial,
const char *text)
{
const vshCmd *tmp = partial;
while (tmp && tmp->next) {
if (tmp->def == tmp->next->def &&
!tmp->next->opts)
break;
tmp = tmp->next;
}
if (tmp && tmp->opts) {
const vshCmdOpt *opt = tmp->opts;
while (opt) {
if (STREQ_NULLABLE(opt->data, text) ||
STREQ_NULLABLE(opt->data, " "))
return opt->def;
opt = opt->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 -1;
list_len = virStringListLength((const char **) *list);
if (VIR_ALLOC_N(newList, list_len + 1) < 0)
return -1;
for (i = 0; i < list_len; i++) {
if (!STRPREFIX((*list)[i], text)) {
VIR_FREE((*list)[i]);
continue;
}
VIR_STEAL_PTR(newList[newList_len], (*list)[i]);
newList_len++;
}
ignore_value(VIR_REALLOC_N_QUIET(newList, newList_len + 1));
VIR_FREE(*list);
*list = newList;
return 0;
}
static char *
vshReadlineParse(const char *text, int state)
{
static vshCmd *partial;
static char **list;
static size_t list_index;
const vshCmdDef *cmd = NULL;
const vshCmdOptDef *opt = NULL;
char *ret = NULL;
if (!state) {
char *buf = vshStrdup(NULL, rl_line_buffer);
vshCommandFree(partial);
partial = NULL;
virStringListFree(list);
list = NULL;
list_index = 0;
*(buf + rl_point) = '\0';
vshCommandStringParse(NULL, buf, &partial);
VIR_FREE(buf);
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, text);
}
if (!list) {
if (!cmd) {
list = vshReadlineCommandGenerator(text);
} else {
if (!opt || (opt->type != VSH_OT_DATA &&
opt->type != VSH_OT_STRING &&
opt->type != VSH_OT_ARGV))
list = vshReadlineOptionsGenerator(text, cmd, partial);
if (opt && opt->completer) {
char **completer_list = opt->completer(autoCompleteOpaque,
partial,
opt->completer_flags);
/* For string list returned by completer we have to do
* filtering based on @text because completer returns all
* possible strings. */
if (completer_list &&
(vshCompleterFilter(&completer_list, text) < 0 ||
virStringListMerge(&list, &completer_list) < 0)) {
virStringListFree(completer_list);
goto cleanup;
}
}
}
}
if (list) {
ret = vshStrdup(NULL, list[list_index]);
list_index++;
}
if (ret &&
!rl_completion_quote_character) {
virBuffer buf = VIR_BUFFER_INITIALIZER;
virBufferEscapeShell(&buf, ret);
VIR_FREE(ret);
ret = virBufferContentAndReset(&buf);
}
cleanup:
if (!ret) {
vshCommandFree(partial);
partial = NULL;
virStringListFree(list);
list = NULL;
list_index = 0;
}
return ret;
}
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;
}
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)
{
char *userdir = NULL;
int max_history = 500;
int ret = -1;
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;
if (virAsprintf(&histsize_env, "%s_HISTSIZE", ctl->env_prefix) < 0)
goto cleanup;
/* 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 $%s value."), histsize_env);
goto cleanup;
} else if (max_history > HISTSIZE_MAX || max_history < 0) {
vshError(ctl, _("$%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 = 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;
}
}
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 = getenv(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 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)
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(ctl, 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;
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 = "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")
},
{.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;
bool err = 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;
if (vshCommandOptBool(cmd, "err"))
err = 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) {
if (err)
vshError(ctl, "%s", arg);
else
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,
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(ctl, def) < 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)
{
bool ret = false;
const vshClientHooks *hooks = ctl->hooks;
int stdin_fileno = STDIN_FILENO;
const char *arg = "";
const vshCmdOpt *opt = NULL;
char **matches = NULL, **iter;
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (vshCommandOptStringQuiet(ctl, cmd, "string", &arg) <= 0)
goto cleanup;
/* 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)))
goto cleanup;
while ((opt = vshCommandOptArgv(ctl, cmd, opt))) {
if (virBufferUse(&buf) != 0)
virBufferAddChar(&buf, ' ');
virBufferAddStr(&buf, opt->data);
arg = opt->data;
}
if (virBufferCheckError(&buf) < 0)
goto cleanup;
vshReadlineInit(ctl);
if (!(rl_line_buffer = virBufferContentAndReset(&buf)) &&
VIR_STRDUP(rl_line_buffer, "") < 0)
goto cleanup;
/* 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)))
goto cleanup;
for (iter = matches; *iter; iter++) {
if (iter == matches && matches[1])
continue;
printf("%s\n", *iter);
}
ret = true;
cleanup:
virBufferFreeAndReset(&buf);
virStringListFree(matches);
return ret;
}
#else /* !WITH_READLINE */
bool
cmdComplete(vshControl *ctl ATTRIBUTE_UNUSED,
const vshCmd *cmd ATTRIBUTE_UNUSED)
{
return false;
}
#endif /* !WITH_READLINE */
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