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
25 #include <sys/types.h>
28 #include <rpc/types.h>
31 #include "../src/guestfs_protocol.h"
33 /*-- in guestfsd.c --*/
34 extern int xwrite (int sock, const void *buf, size_t len);
35 extern int xread (int sock, void *buf, size_t len);
37 extern int add_string (char ***argv, int *size, int *alloc, const char *str);
38 extern int count_strings (char * const* const argv);
39 extern void sort_strings (char **argv, int len);
40 extern void free_strings (char **argv);
41 extern void free_stringslen (char **argv, int len);
43 extern int command (char **stdoutput, char **stderror, const char *name, ...);
44 extern int commandv (char **stdoutput, char **stderror,
45 char * const* const argv);
47 extern int shell_quote (char *out, int len, const char *in);
56 extern int root_mounted;
58 /*-- in stubs.c (auto-generated) --*/
59 extern void dispatch_incoming_message (XDR *);
60 extern guestfs_lvm_int_pv_list *parse_command_line_pvs (void);
61 extern guestfs_lvm_int_vg_list *parse_command_line_vgs (void);
62 extern guestfs_lvm_int_lv_list *parse_command_line_lvs (void);
65 extern void main_loop (int sock);
67 /* ordinary daemon functions use these to indicate errors */
68 extern void reply_with_error (const char *fs, ...)
69 __attribute__((format (printf,1,2)));
70 extern void reply_with_perror (const char *fs, ...)
71 __attribute__((format (printf,1,2)));
73 /* daemon functions that receive files (FileIn) should call
74 * receive_file for each FileIn parameter.
76 typedef int (*receive_cb) (void *opaque, const void *buf, int len);
77 extern int receive_file (receive_cb cb, void *opaque);
79 /* daemon functions that receive files (FileIn) can call this
80 * to cancel incoming transfers (eg. if there is a local error),
81 * but they MUST then call reply_with_error or reply_with_perror.
83 extern void cancel_receive (void);
85 /* daemon functions that return files (FileOut) should call
86 * reply, then send_file_* for each FileOut parameter.
87 * Note max write size if GUESTFS_MAX_CHUNK_SIZE.
89 extern int send_file_write (const void *buf, int len);
90 extern void send_file_end (int cancel);
92 /* only call this if there is a FileOut parameter */
93 extern void reply (xdrproc_t xdrp, char *ret);
95 /* Append to existing string. If existing string is NULL then
96 * this creates a new string. This uses an "interesting" variation
100 #define catprintf(strp,fs,...) \
101 asprintf ((strp), "%s" fs, *(strp) ? *(strp) : "", __VA_ARGS__)
103 /* Helper for functions that need a root filesystem mounted.
104 * NB. Cannot be used for FileIn functions.
106 #define NEED_ROOT(errcode) \
108 if (!root_mounted) { \
109 reply_with_error ("%s: you must call 'mount' first to mount the root filesystem", __func__); \
115 /* Helper for functions that need an argument ("path") that is absolute.
116 * NB. Cannot be used for FileIn functions.
118 #define ABS_PATH(path,errcode) \
120 if ((path)[0] != '/') { \
121 reply_with_error ("%s: path must start with a / character", __func__); \
126 /* Helper for functions that need an argument ("path") that is a device.
127 * NB. Cannot be used for FileIn functions.
129 #define IS_DEVICE(path,errcode) \
131 struct stat statbuf; \
132 if (strncmp ((path), "/dev/", 5) != 0) { \
133 reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \
136 if (stat ((path), &statbuf) == -1) { \
137 reply_with_perror ("%s: %s", __func__, (path)); \
142 /* Helper for functions which need either an absolute path in the
143 * mounted filesystem, OR a /dev/ device which exists.
144 * NB. Cannot be used for FileIn functions.
146 #define NEED_ROOT_OR_IS_DEVICE(path,errcode) \
148 if (strncmp ((path), "/dev/", 5) == 0) \
149 IS_DEVICE ((path),(errcode)); \
151 NEED_ROOT ((errcode)); \
152 ABS_PATH ((path),(errcode)); \
157 * (1) You must match CHROOT_IN and CHROOT_OUT even along error paths.
158 * (2) You must not change directory! cwd must always be "/", otherwise
159 * we can't escape our own chroot.
160 * (3) All paths specified must be absolute.
161 * (4) CHROOT_OUT does not affect errno.
163 #define CHROOT_IN chroot ("/sysroot");
165 do { int old_errno = errno; chroot ("."); errno = old_errno; } while (0)
167 /* Marks functions which are not implemented.
168 * NB. Cannot be used for FileIn functions.
170 #define XXX_NOT_IMPL(errcode) \
172 reply_with_error ("%s: function not implemented", __func__); \
177 #endif /* GUESTFSD_DAEMON_H */