1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 #ifndef GUESTFSD_DAEMON_H
20 #define GUESTFSD_DAEMON_H
27 #include <rpc/types.h>
30 #include "../src/guestfs_protocol.h"
32 /*-- in guestfsd.c --*/
35 extern const char *sysroot;
36 extern int sysroot_len;
38 extern char *sysroot_path (const char *path);
40 extern int xwrite (int sock, const void *buf, size_t len)
41 __attribute__((__warn_unused_result__));
42 extern int xread (int sock, void *buf, size_t len)
43 __attribute__((__warn_unused_result__));
45 extern int add_string (char ***argv, int *size, int *alloc, const char *str);
46 extern int count_strings (char *const *argv);
47 extern void sort_strings (char **argv, int len);
48 extern void free_strings (char **argv);
49 extern void free_stringslen (char **argv, int len);
51 #define command(out,err,name,...) commandf((out),(err),0,(name),__VA_ARGS__)
52 #define commandr(out,err,name,...) commandrf((out),(err),0,(name),__VA_ARGS__)
53 #define commandv(out,err,argv) commandvf((out),(err),0,(argv))
54 #define commandrv(out,err,argv) commandrvf((out),(err),0,(argv))
56 #define COMMAND_FLAG_FOLD_STDOUT_ON_STDERR 1
58 extern int commandf (char **stdoutput, char **stderror, int flags,
59 const char *name, ...);
60 extern int commandrf (char **stdoutput, char **stderror, int flags,
61 const char *name, ...);
62 extern int commandvf (char **stdoutput, char **stderror, int flags,
63 char const *const *argv);
64 extern int commandrvf (char **stdoutput, char **stderror, int flags,
65 char const* const *argv);
67 extern char **split_lines (char *str);
69 extern void trim (char *str);
71 extern int device_name_translation (char *device, const char *func);
73 extern void udev_settle (void);
75 /* This just stops gcc from giving a warning about our custom
76 * printf formatters %Q and %R. See HACKING file for more
80 asprintf_nowarn (char **strp, const char *fmt, ...)
86 r = vasprintf (strp, fmt, args);
91 /*-- in names.c (auto-generated) --*/
92 extern const char *function_names[];
99 extern int root_mounted;
101 /*-- in stubs.c (auto-generated) --*/
102 extern void dispatch_incoming_message (XDR *);
103 extern guestfs_int_lvm_pv_list *parse_command_line_pvs (void);
104 extern guestfs_int_lvm_vg_list *parse_command_line_vgs (void);
105 extern guestfs_int_lvm_lv_list *parse_command_line_lvs (void);
107 /*-- in optgroups.c (auto-generated) --*/
109 const char *group; /* Name of the optional group. */
110 int (*available) (void); /* Function to test availability. */
112 extern struct optgroup optgroups[];
115 /* Use this as a replacement for sync(2). */
116 extern int sync_disks (void);
119 extern void main_loop (int sock) __attribute__((noreturn));
121 /* ordinary daemon functions use these to indicate errors
122 * NB: you don't need to prefix the string with the current command,
123 * it is added automatically by the client-side RPC stubs.
125 extern void reply_with_error (const char *fs, ...)
126 __attribute__((format (printf,1,2)));
127 extern void reply_with_perror_errno (int err, const char *fs, ...)
128 __attribute__((format (printf,2,3)));
129 #define reply_with_perror(...) reply_with_perror_errno(errno, __VA_ARGS__)
131 /* daemon functions that receive files (FileIn) should call
132 * receive_file for each FileIn parameter.
134 typedef int (*receive_cb) (void *opaque, const void *buf, int len);
135 extern int receive_file (receive_cb cb, void *opaque);
137 /* daemon functions that receive files (FileIn) can call this
138 * to cancel incoming transfers (eg. if there is a local error),
139 * but they MUST then call reply_with_*.
141 extern void cancel_receive (void);
143 /* daemon functions that return files (FileOut) should call
144 * reply, then send_file_* for each FileOut parameter.
145 * Note max write size if GUESTFS_MAX_CHUNK_SIZE.
147 extern int send_file_write (const void *buf, int len);
148 extern int send_file_end (int cancel);
150 /* only call this if there is a FileOut parameter */
151 extern void reply (xdrproc_t xdrp, char *ret);
153 /* Helper for functions that need a root filesystem mounted.
154 * NB. Cannot be used for FileIn functions.
156 #define NEED_ROOT(fail_stmt) \
158 if (!root_mounted) { \
159 reply_with_error ("%s: you must call 'mount' first to mount the root filesystem", __func__); \
165 /* Helper for functions that need an argument ("path") that is absolute.
166 * NB. Cannot be used for FileIn functions.
168 #define ABS_PATH(path,fail_stmt) \
170 if ((path)[0] != '/') { \
171 reply_with_error ("%s: path must start with a / character", __func__); \
176 /* All functions that need an argument that is a device or partition name
177 * must call this macro. It checks that the device exists and does
178 * device name translation (described in the guestfs(3) manpage).
179 * Note that the "path" argument may be modified.
181 * NB. Cannot be used for FileIn functions.
183 #define RESOLVE_DEVICE(path,fail_stmt) \
185 if (STRNEQLEN ((path), "/dev/", 5)) { \
186 reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \
189 if (device_name_translation ((path), __func__) == -1) \
193 /* Helper for functions which need either an absolute path in the
194 * mounted filesystem, OR a /dev/ device which exists.
196 * NB. Cannot be used for FileIn functions.
198 * NB #2: Functions which mix filenames and device paths should be
199 * avoided, and existing functions should be deprecated. This is
200 * because we intend in future to make device parameters a distinct
201 * type from filenames.
203 #define REQUIRE_ROOT_OR_RESOLVE_DEVICE(path,fail_stmt) \
205 if (STREQLEN ((path), "/dev/", 5)) \
206 RESOLVE_DEVICE ((path), fail_stmt); \
208 NEED_ROOT (fail_stmt); \
209 ABS_PATH ((path),fail_stmt); \
214 * (1) You must match CHROOT_IN and CHROOT_OUT even along error paths.
215 * (2) You must not change directory! cwd must always be "/", otherwise
216 * we can't escape our own chroot.
217 * (3) All paths specified must be absolute.
218 * (4) Neither macro affects errno.
222 int __old_errno = errno; \
223 if (chroot (sysroot) == -1) \
224 perror ("CHROOT_IN: sysroot"); \
225 errno = __old_errno; \
229 int __old_errno = errno; \
230 if (chroot (".") == -1) \
231 perror ("CHROOT_OUT: ."); \
232 errno = __old_errno; \
235 /* Marks functions which are not implemented.
236 * NB. Cannot be used for FileIn functions.
238 #define XXX_NOT_IMPL(errcode) \
240 reply_with_error ("%s: function not implemented", __func__); \
245 /* Marks functions which are not available.
246 * NB. Cannot be used for FileIn functions.
248 #define NOT_AVAILABLE(errcode) \
250 reply_with_error ("%s: function not available", __func__); \
255 #ifndef __attribute__
256 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
257 # define __attribute__(x) /* empty */
261 #ifndef ATTRIBUTE_UNUSED
262 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
265 #define STREQ(a,b) (strcmp((a),(b)) == 0)
266 #define STRCASEEQ(a,b) (strcasecmp((a),(b)) == 0)
267 #define STRNEQ(a,b) (strcmp((a),(b)) != 0)
268 #define STRCASENEQ(a,b) (strcasecmp((a),(b)) != 0)
269 #define STREQLEN(a,b,n) (strncmp((a),(b),(n)) == 0)
270 #define STRCASEEQLEN(a,b,n) (strncasecmp((a),(b),(n)) == 0)
271 #define STRNEQLEN(a,b,n) (strncmp((a),(b),(n)) != 0)
272 #define STRCASENEQLEN(a,b,n) (strncasecmp((a),(b),(n)) != 0)
273 #define STRPREFIX(a,b) (strncmp((a),(b),strlen((b))) == 0)
275 #endif /* GUESTFSD_DAEMON_H */