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libvirt/tools/vsh.h
Peter Krempa d18e78c246 vsh: Introduce helper to parse --bandwidth 
Historically we've used 'unsigned long' and allowed wrapping of negative
numbers for bandwidth values. Add a helper that will simplify adding
support for scaled integers and support for byte granularity while
keeping the compatibility with the older approach.
2016-03-29 15:47:40 +02:00

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/*
* vsh.h: 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>
*/
#ifndef VSH_H
# define VSH_H
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <stdarg.h>
# include <unistd.h>
# include <sys/stat.h>
# include <termios.h>
# include "internal.h"
# include "virerror.h"
# include "virthread.h"
# define VIR_FROM_THIS VIR_FROM_NONE
# define GETTIMEOFDAY(T) gettimeofday(T, NULL)
# define VSH_MAX_XML_FILE (10*1024*1024)
# define VSH_MATCH(FLAG) (flags & (FLAG))
/**
* The log configuration
*/
# define MSG_BUFFER 4096
# define DIR_MODE (S_IWUSR | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) /* 0755 */
# define FILE_MODE (S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH) /* 0644 */
# define LOCK_MODE (S_IWUSR | S_IRUSR) /* 0600 */
# define LVL_DEBUG "DEBUG"
# define LVL_INFO "INFO"
# define LVL_NOTICE "NOTICE"
# define LVL_WARNING "WARNING"
# define LVL_ERROR "ERROR"
/**
* vshErrorLevel:
*
* Indicates the level of a log message
*/
typedef enum {
VSH_ERR_DEBUG = 0,
VSH_ERR_INFO,
VSH_ERR_NOTICE,
VSH_ERR_WARNING,
VSH_ERR_ERROR
} vshErrorLevel;
# define VSH_DEBUG_DEFAULT VSH_ERR_ERROR
/*
* virsh command line grammar:
*
* command_line = <command>\n | <command>; <command>; ...
*
* command = <keyword> <option> [--] <data>
*
* option = <bool_option> | <int_option> | <string_option>
* data = <string>
*
* bool_option = --optionname
* int_option = --optionname <number> | --optionname=<number>
* string_option = --optionname <string> | --optionname=<string>
*
* keyword = [a-zA-Z][a-zA-Z-]*
* number = [0-9]+
* string = ('[^']*'|"([^\\"]|\\.)*"|([^ \t\n\\'"]|\\.))+
*
*/
/*
* vshCmdOptType - command option type
*/
typedef enum {
VSH_OT_BOOL, /* optional boolean option */
VSH_OT_STRING, /* optional string option */
VSH_OT_INT, /* optional or mandatory int option */
VSH_OT_DATA, /* string data (as non-option) */
VSH_OT_ARGV, /* remaining arguments */
VSH_OT_ALIAS, /* alternate spelling for a later argument */
} vshCmdOptType;
/*
* Command Option Flags
*/
enum {
VSH_OFLAG_NONE = 0, /* without flags */
VSH_OFLAG_REQ = (1 << 0), /* option required */
VSH_OFLAG_EMPTY_OK = (1 << 1), /* empty string option allowed */
VSH_OFLAG_REQ_OPT = (1 << 2), /* --optionname required */
};
/* forward declarations */
typedef struct _vshClientHooks vshClientHooks;
typedef struct _vshCmd vshCmd;
typedef struct _vshCmdDef vshCmdDef;
typedef struct _vshCmdGrp vshCmdGrp;
typedef struct _vshCmdInfo vshCmdInfo;
typedef struct _vshCmdOpt vshCmdOpt;
typedef struct _vshCmdOptDef vshCmdOptDef;
typedef struct _vshControl vshControl;
typedef char **(*vshCompleter)(unsigned int flags);
/*
* vshCmdInfo -- name/value pair for information about command
*
* Commands should have at least the following names:
* "help" - short description of command
* "desc" - description of command, or empty string
*/
struct _vshCmdInfo {
const char *name; /* name of information, or NULL for list end */
const char *data; /* non-NULL information */
};
/*
* vshCmdOptDef - command option definition
*/
struct _vshCmdOptDef {
const char *name; /* the name of option, or NULL for list end */
vshCmdOptType type; /* option type */
unsigned int flags; /* flags */
const char *help; /* non-NULL help string; or for VSH_OT_ALIAS
* the name of a later public option */
vshCompleter completer; /* option completer */
unsigned int completer_flags; /* option completer flags */
};
/*
* vshCmdOpt - command options
*
* After parsing a command, all arguments to the command have been
* collected into a list of these objects.
*/
struct _vshCmdOpt {
const vshCmdOptDef *def; /* non-NULL pointer to option definition */
char *data; /* allocated data, or NULL for bool option */
vshCmdOpt *next;
};
/*
* Command Usage Flags
*/
enum {
VSH_CMD_FLAG_NOCONNECT = (1 << 0), /* no prior connection needed */
VSH_CMD_FLAG_ALIAS = (1 << 1), /* command is an alias */
};
/*
* vshCmdDef - command definition
*/
struct _vshCmdDef {
const char *name; /* name of command, or NULL for list end */
bool (*handler) (vshControl *, const vshCmd *); /* command handler */
const vshCmdOptDef *opts; /* definition of command options */
const vshCmdInfo *info; /* details about command */
unsigned int flags; /* bitwise OR of VSH_CMD_FLAG */
};
/*
* vshCmd - parsed command
*/
struct _vshCmd {
const vshCmdDef *def; /* command definition */
vshCmdOpt *opts; /* list of command arguments */
vshCmd *next; /* next command */
};
/*
* vshControl
*/
struct _vshControl {
const char *name; /* hardcoded name of the binary that cannot
* be changed without recompilation compared
* to program name */
char *connname; /* connection name */
char *progname; /* program name */
vshCmd *cmd; /* the current command */
char *cmdstr; /* string with command */
bool imode; /* interactive mode? */
bool quiet; /* quiet mode */
bool timing; /* print timing info? */
int debug; /* print debug messages? */
char *logfile; /* log file name */
int log_fd; /* log file descriptor */
char *historydir; /* readline history directory name */
char *historyfile; /* readline history file name */
virThread eventLoop;
virMutex lock;
bool eventLoopStarted;
bool quit;
int eventPipe[2]; /* Write-to-self pipe to end waiting for an
* event to occur */
int eventTimerId; /* id of event loop timeout registration */
int keepalive_interval; /* Client keepalive interval */
int keepalive_count; /* Client keepalive count */
# ifndef WIN32
struct termios termattr; /* settings of the tty terminal */
# endif
bool istty; /* is the terminal a tty */
const vshClientHooks *hooks;/* mandatory client specific hooks */
void *privData; /* client specific data */
};
typedef void *
(*vshConnectionHook)(vshControl *ctl);
struct _vshClientHooks {
vshConnectionHook connHandler;
};
struct _vshCmdGrp {
const char *name; /* name of group, or NULL for list end */
const char *keyword; /* help keyword */
const vshCmdDef *commands;
};
void vshError(vshControl *ctl, const char *format, ...)
ATTRIBUTE_FMT_PRINTF(2, 3);
void vshOpenLogFile(vshControl *ctl);
void vshOutputLogFile(vshControl *ctl, int log_level, const char *format,
va_list ap)
ATTRIBUTE_FMT_PRINTF(3, 0);
void vshCloseLogFile(vshControl *ctl);
const char *vshCmddefGetInfo(const vshCmdDef *cmd, const char *info);
const vshCmdDef *vshCmddefSearch(const char *cmdname);
bool vshCmddefHelp(vshControl *ctl, const char *name);
const vshCmdGrp *vshCmdGrpSearch(const char *grpname);
bool vshCmdGrpHelp(vshControl *ctl, const char *name);
int vshCommandOptInt(vshControl *ctl, const vshCmd *cmd,
const char *name, int *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptUInt(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned int *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptUIntWrap(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned int *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptUL(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptULWrap(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptStringQuiet(vshControl *ctl, const vshCmd *cmd,
const char *name, const char **value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptStringReq(vshControl *ctl, const vshCmd *cmd,
const char *name, const char **value)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptLongLong(vshControl *ctl, const vshCmd *cmd,
const char *name, long long *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptULongLong(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long long *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptULongLongWrap(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long long *value)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshCommandOptScaledInt(vshControl *ctl, const vshCmd *cmd,
const char *name, unsigned long long *value,
int scale, unsigned long long max)
ATTRIBUTE_NONNULL(4) ATTRIBUTE_RETURN_CHECK;
int vshBlockJobOptionBandwidth(vshControl *ctl,
const vshCmd *cmd,
bool bytes,
unsigned long *bandwidth);
bool vshCommandOptBool(const vshCmd *cmd, const char *name);
bool vshCommandRun(vshControl *ctl, const vshCmd *cmd);
bool vshCommandStringParse(vshControl *ctl, char *cmdstr);
const vshCmdOpt *vshCommandOptArgv(vshControl *ctl, const vshCmd *cmd,
const vshCmdOpt *opt);
bool vshCommandArgvParse(vshControl *ctl, int nargs, char **argv);
int vshCommandOptTimeoutToMs(vshControl *ctl, const vshCmd *cmd, int *timeout);
void vshPrint(vshControl *ctl, const char *format, ...)
ATTRIBUTE_FMT_PRINTF(2, 3);
void vshPrintExtra(vshControl *ctl, const char *format, ...)
ATTRIBUTE_FMT_PRINTF(2, 3);
bool vshInit(vshControl *ctl, const vshCmdGrp *groups, const vshCmdDef *set);
bool vshInitReload(vshControl *ctl);
void vshDeinit(vshControl *ctl);
void vshDebug(vshControl *ctl, int level, const char *format, ...)
ATTRIBUTE_FMT_PRINTF(3, 4);
/* User visible sort, so we want locale-specific case comparison. */
# define vshStrcasecmp(S1, S2) strcasecmp(S1, S2)
int vshNameSorter(const void *a, const void *b);
virTypedParameterPtr vshFindTypedParamByName(const char *name,
virTypedParameterPtr list,
int count);
char *vshGetTypedParamValue(vshControl *ctl, virTypedParameterPtr item)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
double vshPrettyCapacity(unsigned long long val, const char **unit);
int vshStringToArray(const char *str, char ***array);
/* Given an index, return either the name of that device (non-NULL) or
* of its parent (NULL if a root). */
typedef const char * (*vshTreeLookup)(int devid, bool parent, void *opaque);
int vshTreePrint(vshControl *ctl, vshTreeLookup lookup, void *opaque,
int num_devices, int devid);
/* error handling */
extern virErrorPtr last_error;
void vshErrorHandler(void *opaque, virErrorPtr error);
void vshReportError(vshControl *ctl);
void vshResetLibvirtError(void);
void vshSaveLibvirtError(void);
/* file handling */
char *vshEditWriteToTempFile(vshControl *ctl, const char *doc);
int vshEditFile(vshControl *ctl, const char *filename);
char *vshEditReadBackFile(vshControl *ctl, const char *filename);
int vshAskReedit(vshControl *ctl, const char *msg, bool relax_avail);
/* terminal modifications */
bool vshTTYIsInterruptCharacter(vshControl *ctl, const char chr);
int vshTTYDisableInterrupt(vshControl *ctl);
int vshTTYRestore(vshControl *ctl);
int vshTTYMakeRaw(vshControl *ctl, bool report_errors);
bool vshTTYAvailable(vshControl *ctl);
/* waiting for events */
enum {
VSH_EVENT_INTERRUPT,
VSH_EVENT_TIMEOUT,
VSH_EVENT_DONE,
};
void vshEventCleanup(vshControl *ctl);
void vshEventDone(vshControl *ctl);
void vshEventLoop(void *opaque);
int vshEventStart(vshControl *ctl, int timeout_ms);
void vshEventTimeout(int timer, void *opaque);
int vshEventWait(vshControl *ctl);
/* generic commands */
extern const vshCmdOptDef opts_help[];
extern const vshCmdInfo info_help[];
extern const vshCmdOptDef opts_cd[];
extern const vshCmdInfo info_cd[];
extern const vshCmdOptDef opts_echo[];
extern const vshCmdInfo info_echo[];
extern const vshCmdInfo info_pwd[];
extern const vshCmdInfo info_quit[];
bool cmdHelp(vshControl *ctl, const vshCmd *cmd);
bool cmdCd(vshControl *ctl, const vshCmd *cmd);
bool cmdEcho(vshControl *ctl, const vshCmd *cmd);
bool cmdPwd(vshControl *ctl, const vshCmd *cmd);
bool cmdQuit(vshControl *ctl, const vshCmd *cmd);
# define VSH_CMD_CD \
{ \
.name = "cd", \
.handler = cmdCd, \
.opts = opts_cd, \
.info = info_cd, \
.flags = VSH_CMD_FLAG_NOCONNECT \
}
# define VSH_CMD_ECHO \
{ \
.name = "echo", \
.handler = cmdEcho, \
.opts = opts_echo, \
.info = info_echo, \
.flags = VSH_CMD_FLAG_NOCONNECT \
}
# define VSH_CMD_EXIT \
{ \
.name = "exit", \
.handler = cmdQuit, \
.opts = NULL, \
.info = info_quit, \
.flags = VSH_CMD_FLAG_NOCONNECT \
}
# define VSH_CMD_HELP \
{ \
.name = "help", \
.handler = cmdHelp, \
.opts = opts_help, \
.info = info_help, \
.flags = VSH_CMD_FLAG_NOCONNECT \
}
# define VSH_CMD_PWD \
{ \
.name = "pwd", \
.handler = cmdPwd, \
.opts = NULL, \
.info = info_pwd, \
.flags = VSH_CMD_FLAG_NOCONNECT \
}
# define VSH_CMD_QUIT \
{ \
.name = "quit", \
.handler = cmdQuit, \
.opts = NULL, \
.info = info_quit, \
.flags = VSH_CMD_FLAG_NOCONNECT \
}
/* readline */
char * vshReadline(vshControl *ctl, const char *prompt);
/* allocation wrappers */
void *_vshMalloc(vshControl *ctl, size_t sz, const char *filename, int line);
# define vshMalloc(_ctl, _sz) _vshMalloc(_ctl, _sz, __FILE__, __LINE__)
void *_vshCalloc(vshControl *ctl, size_t nmemb, size_t sz,
const char *filename, int line);
# define vshCalloc(_ctl, _nmemb, _sz) \
_vshCalloc(_ctl, _nmemb, _sz, __FILE__, __LINE__)
char *_vshStrdup(vshControl *ctl, const char *s, const char *filename,
int line);
# define vshStrdup(_ctl, _s) _vshStrdup(_ctl, _s, __FILE__, __LINE__)
/* Poison the raw allocating identifiers in favor of our vsh variants. */
# undef malloc
# undef calloc
# undef realloc
# undef strdup
# define malloc use_vshMalloc_instead_of_malloc
# define calloc use_vshCalloc_instead_of_calloc
# define realloc use_vshRealloc_instead_of_realloc
# define strdup use_vshStrdup_instead_of_strdup
/* Macros to help dealing with mutually exclusive options. */
/* VSH_EXCLUSIVE_OPTIONS_EXPR:
*
* @NAME1: String containing the name of the option.
* @EXPR1: Expression to validate the variable (boolean variable)
* @NAME2: String containing the name of the option.
* @EXPR2: Expression to validate the variable (boolean variable)
*
* Reject mutually exclusive command options in virsh. Use the
* provided expression to check the variables.
*
* This helper does an early return and therefore it has to be called
* before anything that would require cleanup.
*/
# define VSH_EXCLUSIVE_OPTIONS_EXPR(NAME1, EXPR1, NAME2, EXPR2) \
if ((EXPR1) && (EXPR2)) { \
vshError(ctl, _("Options --%s and --%s are mutually exclusive"), \
NAME1, NAME2); \
return false; \
}
/* VSH_EXCLUSIVE_OPTIONS:
*
* @NAME1: String containing the name of the option.
* @NAME2: String containing the name of the option.
*
* Reject mutually exclusive command options in virsh. Use the
* vshCommandOptBool call to request them.
*
* This helper does an early return and therefore it has to be called
* before anything that would require cleanup.
*/
# define VSH_EXCLUSIVE_OPTIONS(NAME1, NAME2) \
VSH_EXCLUSIVE_OPTIONS_EXPR(NAME1, vshCommandOptBool(cmd, NAME1), \
NAME2, vshCommandOptBool(cmd, NAME2))
/* VSH_EXCLUSIVE_OPTIONS_VAR:
*
* @VARNAME1: Boolean variable containing the value of the option of same name
* @VARNAME2: Boolean variable containing the value of the option of same name
*
* Reject mutually exclusive command options in virsh. Check in variables that
* contain the value and have same name as the option.
*
* This helper does an early return and therefore it has to be called
* before anything that would require cleanup.
*/
# define VSH_EXCLUSIVE_OPTIONS_VAR(VARNAME1, VARNAME2) \
VSH_EXCLUSIVE_OPTIONS_EXPR(#VARNAME1, VARNAME1, #VARNAME2, VARNAME2)
/* Macros to help dealing with required options. */
/* VSH_REQUIRE_OPTION_EXPR:
*
* @NAME1: String containing the name of the option.
* @EXPR1: Expression to validate the variable (boolean variable).
* @NAME2: String containing the name of required option.
* @EXPR2: Expression to validate the variable (boolean variable).
*
* Check if required command options in virsh was set. Use the
* provided expression to check the variables.
*
* This helper does an early return and therefore it has to be called
* before anything that would require cleanup.
*/
# define VSH_REQUIRE_OPTION_EXPR(NAME1, EXPR1, NAME2, EXPR2) \
do { \
if ((EXPR1) && !(EXPR2)) { \
vshError(ctl, _("Option --%s is required by option --%s"), \
NAME2, NAME1); \
return false; \
} \
} while (0)
/* VSH_REQUIRE_OPTION:
*
* @NAME1: String containing the name of the option.
* @NAME2: String containing the name of required option.
*
* Check if required command options in virsh was set. Use the
* vshCommandOptBool call to request them.
*
* This helper does an early return and therefore it has to be called
* before anything that would require cleanup.
*/
# define VSH_REQUIRE_OPTION(NAME1, NAME2) \
VSH_REQUIRE_OPTION_EXPR(NAME1, vshCommandOptBool(cmd, NAME1), \
NAME2, vshCommandOptBool(cmd, NAME2))
/* VSH_REQUIRE_OPTION_VAR:
*
* @VARNAME1: Boolean variable containing the value of the option of same name.
* @VARNAME2: Boolean variable containing the value of required option of
* same name.
*
* Check if required command options in virsh was set. Check in variables
* that contain the value and have same name as the option.
*
* This helper does an early return and therefore it has to be called
* before anything that would require cleanup.
*/
# define VSH_REQUIRE_OPTION_VAR(VARNAME1, VARNAME2) \
VSH_REQUIRE_OPTION_EXPR(#VARNAME1, VARNAME1, #VARNAME2, VARNAME2)
#endif /* VSH_H */
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