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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef GUESTFSD_DAEMON_H
#define GUESTFSD_DAEMON_H
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "../src/guestfs_protocol.h"
/*-- in guestfsd.c --*/
extern int verbose;
extern const char *sysroot;
extern int sysroot_len;
extern char *sysroot_path (const char *path);
extern int xwrite (int sock, const void *buf, size_t len)
__attribute__((__warn_unused_result__));
extern int xread (int sock, void *buf, size_t len)
__attribute__((__warn_unused_result__));
extern int add_string (char ***argv, int *size, int *alloc, const char *str);
extern int count_strings (char *const *argv);
extern void sort_strings (char **argv, int len);
extern void free_strings (char **argv);
extern void free_stringslen (char **argv, int len);
#define command(out,err,name,...) commandf((out),(err),0,(name),__VA_ARGS__)
#define commandr(out,err,name,...) commandrf((out),(err),0,(name),__VA_ARGS__)
#define commandv(out,err,argv) commandvf((out),(err),0,(argv))
#define commandrv(out,err,argv) commandrvf((out),(err),0,(argv))
#define COMMAND_FLAG_FOLD_STDOUT_ON_STDERR 1
extern int commandf (char **stdoutput, char **stderror, int flags,
const char *name, ...);
extern int commandrf (char **stdoutput, char **stderror, int flags,
const char *name, ...);
extern int commandvf (char **stdoutput, char **stderror, int flags,
char const *const *argv);
extern int commandrvf (char **stdoutput, char **stderror, int flags,
char const* const *argv);
extern char **split_lines (char *str);
extern int device_name_translation (char *device, const char *func);
extern void udev_settle (void);
/* This just stops gcc from giving a warning about our custom
* printf formatters %Q and %R. See HACKING file for more
* info about these.
*/
static inline int
asprintf_nowarn (char **strp, const char *fmt, ...)
{
int r;
va_list args;
va_start (args, fmt);
r = vasprintf (strp, fmt, args);
va_end (args);
return r;
}
/*-- in names.c (auto-generated) --*/
extern const char *function_names[];
/*-- in proto.c --*/
extern int proc_nr;
extern int serial;
/*-- in mount.c --*/
extern int root_mounted;
/*-- in stubs.c (auto-generated) --*/
extern void dispatch_incoming_message (XDR *);
extern guestfs_int_lvm_pv_list *parse_command_line_pvs (void);
extern guestfs_int_lvm_vg_list *parse_command_line_vgs (void);
extern guestfs_int_lvm_lv_list *parse_command_line_lvs (void);
/*-- in proto.c --*/
extern void main_loop (int sock) __attribute__((noreturn));
/* ordinary daemon functions use these to indicate errors */
extern void reply_with_error (const char *fs, ...)
__attribute__((format (printf,1,2)));
extern void reply_with_perror (const char *fs, ...)
__attribute__((format (printf,1,2)));
/* daemon functions that receive files (FileIn) should call
* receive_file for each FileIn parameter.
*/
typedef int (*receive_cb) (void *opaque, const void *buf, int len);
extern int receive_file (receive_cb cb, void *opaque);
/* daemon functions that receive files (FileIn) can call this
* to cancel incoming transfers (eg. if there is a local error),
* but they MUST then call reply_with_error or reply_with_perror.
*/
extern void cancel_receive (void);
/* daemon functions that return files (FileOut) should call
* reply, then send_file_* for each FileOut parameter.
* Note max write size if GUESTFS_MAX_CHUNK_SIZE.
*/
extern int send_file_write (const void *buf, int len);
extern int send_file_end (int cancel);
/* only call this if there is a FileOut parameter */
extern void reply (xdrproc_t xdrp, char *ret);
/* Helper for functions that need a root filesystem mounted.
* NB. Cannot be used for FileIn functions.
*/
#define NEED_ROOT(fail_stmt) \
do { \
if (!root_mounted) { \
reply_with_error ("%s: you must call 'mount' first to mount the root filesystem", __func__); \
fail_stmt; \
} \
} \
while (0)
/* Helper for functions that need an argument ("path") that is absolute.
* NB. Cannot be used for FileIn functions.
*/
#define ABS_PATH(path,fail_stmt) \
do { \
if ((path)[0] != '/') { \
reply_with_error ("%s: path must start with a / character", __func__); \
fail_stmt; \
} \
} while (0)
/* All functions that need an argument that is a device or partition name
* must call this macro. It checks that the device exists and does
* device name translation (described in the guestfs(3) manpage).
* Note that the "path" argument may be modified.
*
* NB. Cannot be used for FileIn functions.
*/
#define RESOLVE_DEVICE(path,fail_stmt) \
do { \
if (STRNEQLEN ((path), "/dev/", 5)) { \
reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \
fail_stmt; \
} \
if (device_name_translation ((path), __func__) == -1) \
fail_stmt; \
} while (0)
/* Helper for functions which need either an absolute path in the
* mounted filesystem, OR a /dev/ device which exists.
*
* NB. Cannot be used for FileIn functions.
*
* NB #2: Functions which mix filenames and device paths should be
* avoided, and existing functions should be deprecated. This is
* because we intend in future to make device parameters a distinct
* type from filenames.
*/
#define REQUIRE_ROOT_OR_RESOLVE_DEVICE(path,fail_stmt) \
do { \
if (STREQLEN ((path), "/dev/", 5)) \
RESOLVE_DEVICE ((path), fail_stmt); \
else { \
NEED_ROOT (fail_stmt); \
ABS_PATH ((path),fail_stmt); \
} \
} while (0)
/* NB:
* (1) You must match CHROOT_IN and CHROOT_OUT even along error paths.
* (2) You must not change directory! cwd must always be "/", otherwise
* we can't escape our own chroot.
* (3) All paths specified must be absolute.
* (4) Neither macro affects errno.
*/
#define CHROOT_IN \
do { \
int __old_errno = errno; \
if (chroot (sysroot) == -1) \
perror ("CHROOT_IN: sysroot"); \
errno = __old_errno; \
} while (0)
#define CHROOT_OUT \
do { \
int __old_errno = errno; \
if (chroot (".") == -1) \
perror ("CHROOT_OUT: ."); \
errno = __old_errno; \
} while (0)
/* Marks functions which are not implemented.
* NB. Cannot be used for FileIn functions.
*/
#define XXX_NOT_IMPL(errcode) \
do { \
reply_with_error ("%s: function not implemented", __func__); \
return (errcode); \
} \
while (0)
#ifndef __attribute__
# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
# define __attribute__(x) /* empty */
# endif
#endif
#ifndef ATTRIBUTE_UNUSED
# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#endif
#define STREQ(a,b) (strcmp((a),(b)) == 0)
#define STRCASEEQ(a,b) (strcasecmp((a),(b)) == 0)
#define STRNEQ(a,b) (strcmp((a),(b)) != 0)
#define STRCASENEQ(a,b) (strcasecmp((a),(b)) != 0)
#define STREQLEN(a,b,n) (strncmp((a),(b),(n)) == 0)
#define STRCASEEQLEN(a,b,n) (strncasecmp((a),(b),(n)) == 0)
#define STRNEQLEN(a,b,n) (strncmp((a),(b),(n)) != 0)
#define STRCASENEQLEN(a,b,n) (strncasecmp((a),(b),(n)) != 0)
#define STRPREFIX(a,b) (strncmp((a),(b),strlen((b))) == 0)
#endif /* GUESTFSD_DAEMON_H */
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