[hurd] 23/31: startup: implement bits of the fs and io protocols

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 10218526abf4c7537642cf5c3d8955578d599402
Author: Justus Winter <address@hidden>
Date:   Sat Apr 23 17:52:33 2016 +0200

    startup: implement bits of the fs and io protocols
    
    * startup/Makefile: Build fs and io server with default
    implementations.
    (mung_msg_S.h): Tune regexp only to match the include guard.
    * startup/startup.c (mig_reply_setup): New function.
    (demuxer): Add new protocols.  Nicer implementation.
    (S_file_check_access): New function.
    (S_io_restrict_auth): Likewise.
---
 startup/Makefile  |   6 ++--
 startup/startup.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 101 insertions(+), 11 deletions(-)

diff --git a/startup/Makefile b/startup/Makefile
index ee2ecdd5..db062ad 100644
--- a/startup/Makefile
+++ b/startup/Makefile
@@ -21,15 +21,17 @@ makemode := server
 SRCS = startup.c
 OBJS = $(SRCS:.c=.o) \
        startupServer.o notifyServer.o startup_replyUser.o msgServer.o \
-       startup_notifyUser.o fsysServer.o
+       startup_notifyUser.o fsysServer.o fsServer.o ioServer.o
 target = startup
 HURDLIBS = shouldbeinlibc
 
 # startup does not use libports.  Disable the default payload to port
 # conversion.
 MIGSFLAGS="-DHURD_DEFAULT_PAYLOAD_TO_PORT=1"
+fsServer-CFLAGS="-DMIG_EOPNOTSUPP=EOPNOTSUPP"
+ioServer-CFLAGS="-DMIG_EOPNOTSUPP=EOPNOTSUPP"
 
 include ../Makeconf
 
 mung_msg_S.h: msg_S.h
-       sed 's/msg_server/mung_msg_server/' < $< > $@
+       sed 's/_msg_server/_mung_msg_server/' < $< > $@
diff --git a/startup/startup.c b/startup/startup.c
index 9c45f4b..97a1bab 100644
--- a/startup/startup.c
+++ b/startup/startup.c
@@ -51,12 +51,16 @@
 #include <version.h>
 #include <argp.h>
 #include <pids.h>
+#include <idvec.h>
 
 #include "startup_notify_U.h"
 #include "startup_reply_U.h"
 #include "startup_S.h"
 #include "notify_S.h"
 #include "mung_msg_S.h"
+#include "fsys_S.h"
+#include "fs_S.h"
+#include "io_S.h"
 
 /* host_reboot flags for when we crash.  */
 static int crash_flags = RB_AUTOBOOT;
@@ -498,19 +502,57 @@ run_for_real (char *filename, char *args, int arglen, 
mach_port_t ctty,
 
 /** Main program and setup **/
 
+/* XXX: The libc should provide this function.  */
+static void
+mig_reply_setup (
+       const mach_msg_header_t *in,
+       mach_msg_header_t       *out)
+{
+      static const mach_msg_type_t RetCodeType = {
+               /* msgt_name = */               MACH_MSG_TYPE_INTEGER_32,
+               /* msgt_size = */               32,
+               /* msgt_number = */             1,
+               /* msgt_inline = */             TRUE,
+               /* msgt_longform = */           FALSE,
+               /* msgt_deallocate = */         FALSE,
+               /* msgt_unused = */             0
+       };
+
+#define        InP     (in)
+#define        OutP    ((mig_reply_header_t *) out)
+      OutP->Head.msgh_bits =
+       MACH_MSGH_BITS(MACH_MSGH_BITS_REMOTE(InP->msgh_bits), 0);
+      OutP->Head.msgh_size = sizeof *OutP;
+      OutP->Head.msgh_remote_port = InP->msgh_remote_port;
+      OutP->Head.msgh_local_port = MACH_PORT_NULL;
+      OutP->Head.msgh_seqno = 0;
+      OutP->Head.msgh_id = InP->msgh_id + 100;
+      OutP->RetCodeType = RetCodeType;
+      OutP->RetCode = MIG_BAD_ID;
+#undef InP
+#undef OutP
+}
+
 static int
 demuxer (mach_msg_header_t *inp,
         mach_msg_header_t *outp)
 {
-  extern int notify_server (mach_msg_header_t *, mach_msg_header_t *);
-  extern int startup_server (mach_msg_header_t *, mach_msg_header_t *);
-  extern int msg_server (mach_msg_header_t *, mach_msg_header_t *);
-  extern int fsys_server (mach_msg_header_t *, mach_msg_header_t *);
-
-  return (notify_server (inp, outp) ||
-         msg_server (inp, outp) ||
-         fsys_server (inp, outp) ||
-         startup_server (inp, outp));
+  mig_routine_t routine;
+
+  mig_reply_setup (inp, outp);
+
+  if ((routine = notify_server_routine (inp)) ||
+      (routine = msg_server_routine (inp)) ||
+      (routine = fsys_server_routine (inp)) ||
+      (routine = fs_server_routine (inp)) ||
+      (routine = io_server_routine (inp)) ||
+      (routine = startup_server_routine (inp)))
+    {
+      (*routine) (inp, outp);
+      return TRUE;
+    }
+  else
+    return FALSE;
 }
 
 error_t
@@ -1703,3 +1745,49 @@ S_fsys_forward (mach_port_t server, mach_port_t 
requestor,
 {
   return EOPNOTSUPP;
 }
+
+error_t
+S_file_check_access (mach_port_t server,
+                     int *allowed)
+{
+  if (server != startup)
+    return EOPNOTSUPP;
+  *allowed = 0;
+  return 0;
+}
+
+error_t
+S_io_stat (mach_port_t server,
+           struct stat *st)
+{
+  if (server != startup)
+    return EOPNOTSUPP;
+
+  memset (st, 0, sizeof *st);
+
+  st->st_fstype = FSTYPE_MISC;
+  st->st_fsid = getpid ();
+  st->st_mode = S_IFCHR | S_IROOT;
+
+  return 0;
+}
+
+error_t
+S_io_restrict_auth (mach_port_t server,
+                    mach_port_t *newport,
+                    mach_msg_type_name_t *newporttype,
+                    uid_t *uids, size_t nuids,
+                    uid_t *gids, size_t ngids)
+{
+  struct idvec user = { uids, (unsigned) nuids, (unsigned) nuids };
+
+  if (server != startup)
+    return EOPNOTSUPP;
+
+  if (! idvec_contains (&user, 0))
+    return EPERM;
+
+  *newport = server;
+  *newporttype = MACH_MSG_TYPE_COPY_SEND;
+  return 0;
+}

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