X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Fdaemon.h;h=cbcab639621700413278c2b7eae495023ff69d04;hp=60e1982b86ad66c9a52c99722e92dc81b87ffdfd;hb=a4d2e6df0bbbd7dc9e5bf400e4e35efec0a18ff0;hpb=8e570870f577ff0c3db074f88924633b559af5d4 diff --git a/daemon/daemon.h b/daemon/daemon.h index 60e1982..cbcab63 100644 --- a/daemon/daemon.h +++ b/daemon/daemon.h @@ -20,51 +20,164 @@ #define GUESTFSD_DAEMON_H #include +#include +#include + #include #include -/* in guestfsd.c */ -extern void xwrite (int sock, const void *buf, size_t len); -extern void xread (int sock, void *buf, size_t len); +#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); +extern int xread (int sock, void *buf, size_t len); extern int add_string (char ***argv, int *size, int *alloc, const char *str); -extern int count_strings (char **argv); +extern int count_strings (char * const* const argv); extern void sort_strings (char **argv, int len); extern void free_strings (char **argv); extern void free_stringslen (char **argv, int len); extern int command (char **stdoutput, char **stderror, const char *name, ...); +extern int commandr (char **stdoutput, char **stderror, const char *name, ...); +extern int commandv (char **stdoutput, char **stderror, + char * const* const argv); +extern int commandrv (char **stdoutput, char **stderror, + 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 proto.c */ +/*-- in names.c (auto-generated) --*/ +extern const char *function_names[]; + +/*-- in proto.c --*/ extern int proc_nr; extern int serial; -/* in mount.c */ +/*-- in mount.c --*/ extern int root_mounted; -/* in stubs.c (auto-generated) */ +/*-- 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 */ +/*-- in proto.c --*/ extern void main_loop (int sock); -extern void reply_with_error (const char *fs, ...); -extern void reply_with_perror (const char *fs, ...); + +/* 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 void send_file_end (int cancel); + +/* only call this if there is a FileOut parameter */ extern void reply (xdrproc_t xdrp, char *ret); -#define NEED_ROOT(errcode) \ +/* 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__); \ - return (errcode); \ + fail_stmt; \ } \ } \ while (0) -#define ABS_PATH(path,errcode) \ +/* 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__); \ - return (errcode); \ + 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 (strncmp ((path), "/dev/", 5) != 0) { \ + 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 (strncmp ((path), "/dev/", 5) == 0) \ + RESOLVE_DEVICE ((path), fail_stmt); \ + else { \ + NEED_ROOT (fail_stmt); \ + ABS_PATH ((path),fail_stmt); \ } \ } while (0) @@ -73,8 +186,41 @@ extern void reply (xdrproc_t xdrp, char *ret); * (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 CHROOT_IN chroot ("/sysroot"); -#define CHROOT_OUT chroot ("."); +#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 #endif /* GUESTFSD_DAEMON_H */