Rewrite of main loop impl, start of FileIn/FileOut support.

[libguestfs.git] / daemon / daemon.h

diff --git a/daemon/daemon.h b/daemon/daemon.h
index 42d7727..ca71265 100644 (file)
--- a/daemon/daemon.h
+++ b/daemon/daemon.h
@@ -20,48 +20,110 @@
 #define GUESTFSD_DAEMON_H
 
 #include <stdarg.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
 #include <rpc/types.h>
 #include <rpc/xdr.h>
 
-/* in guestfsd.c */
-extern void xwrite (int sock, const void *buf, size_t len);
-extern void xread (int sock, void *buf, size_t len);
-extern int count_strings (char **argv);
+#include "../src/guestfs_protocol.h"
+
+/*-- in guestfsd.c --*/
+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 * 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 commandv (char **stdoutput, char **stderror,
+                    char * const* const argv);
 
-/* in proto.c */
+/*-- 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_lvm_int_pv_list *parse_command_line_pvs (void);
+extern guestfs_lvm_int_vg_list *parse_command_line_vgs (void);
+extern guestfs_lvm_int_lv_list *parse_command_line_lvs (void);
 
-/* in proto.c */
+/*-- in proto.c --*/
 extern void main_loop (int sock);
+
+/* ordinary daemon functions use these to indicate errors */
 extern void reply_with_error (const char *fs, ...);
 extern void reply_with_perror (const char *fs, ...);
+
+/* daemon functions that return files (FileOut) should call
+ * reply, then send_file for each FileOut parameter.
+ */
+#if 0
+extern void send_file ();
+#endif
+
+/* only call this if there is a FileOut parameter */
 extern void reply (xdrproc_t xdrp, char *ret);
 
-#define NEED_ROOT                                                      \
+/* Helper for functions that need a root filesystem mounted. */
+#define NEED_ROOT(errcode)                                             \
   do {                                                                 \
     if (!root_mounted) {                                               \
       reply_with_error ("%s: you must call 'mount' first to mount the root filesystem", __func__); \
-      return -1;                                                       \
+      return (errcode);                                                        \
     }                                                                  \
   }                                                                    \
   while (0)
 
+/* Helper for functions that need an argument ("path") that is absolute. */
+#define ABS_PATH(path,errcode)                                         \
+  do {                                                                 \
+    if ((path)[0] != '/') {                                            \
+      reply_with_error ("%s: path must start with a / character", __func__); \
+      return (errcode);                                                        \
+    }                                                                  \
+  } while (0)
+
+/* Helper for functions that need an argument ("path") that is a device. */
+#define IS_DEVICE(path,errcode)                                                \
+  do {                                                                 \
+    struct stat statbuf;                                               \
+    if (strncmp ((path), "/dev/", 5) != 0) {                           \
+      reply_with_error ("%s: %s: expecting a device name", __func__, (path)); \
+      return (errcode);                                                        \
+    }                                                                  \
+    if (stat ((path), &statbuf) == -1) {                               \
+      reply_with_perror ("%s: %s", __func__, (path));                  \
+      return (errcode);                                                        \
+    }                                                                  \
+  } 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) CHROOT_OUT does not affect errno.
  */
 #define CHROOT_IN chroot ("/sysroot");
-#define CHROOT_OUT chroot (".");
+#define CHROOT_OUT \
+  do { int old_errno = errno; chroot ("."); errno = old_errno; } while (0)
+
+/* Marks functions which are not implemented. */
+#define XXX_NOT_IMPL(errcode)                                          \
+  do {                                                                 \
+    reply_with_error ("%s: function not implemented", __func__);       \
+    return (errcode);                                                  \
+  }                                                                    \
+  while (0)
 
 #endif /* GUESTFSD_DAEMON_H */