Initial checkin

1 files changed, 149 insertions, 0 deletions

diff --git a/usermux/usermux.c b/usermux/usermux.c
new file mode 100644
index 00000000..060fb411
--- /dev/null
+++ b/usermux/usermux.c
@@ -0,0 +1,149 @@
+/* Multiplexing filesystems by host
+
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include <unistd.h>
+#include <argp.h>
+#include <argz.h>
+#include <error.h>
+#include <sys/time.h>
+#include <hurd/paths.h>
+
+#include "usermux.h"
+
+int netfs_maxsymlinks = 25;
+
+volatile struct mapped_time_value *usermux_mapped_time;
+
+#define OPT_USER_PAT	1
+#define OPT_HOME_PAT	2
+#define OPT_UID_PAT	3
+
+/* Startup options.  */
+static const struct argp_option options[] =
+{
+  { "user-pattern", OPT_USER_PAT, "PAT", 0,
+    "The string to replace in the translator specification with the user name"
+    " (default `${user}')" },
+  { "home-pattern", OPT_HOME_PAT, "PAT", 0,
+    "The string to replace in the translator specification with the user's"
+    " home directory (default `${home}')" },
+  { "uid-pattern", OPT_UID_PAT, "PAT", 0,
+    "The string to replace in the translator specification with the uid"
+    " (default `${uid}')" },
+  { "clear-patterns", 'C', 0, 0,
+    "Reset all patterns to empty; this option may then be followed by options"
+    " to set specific patterns" },
+  { 0 }
+};
+static const char args_doc[] = "[TRANSLATOR [ARG...]]";
+static const char doc[] =
+  "A translator for invoking user-specific translators"
+  "\vThis translator appears like a directory in which user names can be"
+  " looked up, and will start TRANSLATOR to service each resulting node."
+  "  If no pattern occurs in the translator specification, the users's"
+  " home directory is appended to it instead; TRANSLATOR defaults to"
+  " " _HURD_SYMLINK ".";
+
+int
+main (int argc, char **argv)
+{
+  error_t err;
+  struct stat ul_stat;
+  mach_port_t bootstrap;
+  struct usermux mux =
+    { user_pat: "${user}", home_pat: "${home}", uid_pat: "${uid}" };
+  struct netnode root_nn = { mux: &mux };
+
+  error_t parse_opt (int key, char *arg, struct argp_state *state)
+    {
+      switch (key)
+	{
+	case OPT_USER_PAT: mux.user_pat = arg; break;
+	case OPT_HOME_PAT: mux.home_pat = arg; break;
+	case OPT_UID_PAT: mux.uid_pat = arg; break;
+	case 'C': bzero (&mux, sizeof mux); break;
+
+	case ARGP_KEY_NO_ARGS:
+	  bzero (&mux, sizeof mux); /* Default doesn't use them; be careful. */
+	  return argz_create_sep (_HURD_SYMLINK, 0,
+				  &mux.trans_template, &mux.trans_template_len);
+	case ARGP_KEY_ARGS:
+	  /* Steal the entire tail of arg vector for our own use.  */
+	  return argz_create (state->argv + state->next,
+			      &mux.trans_template, &mux.trans_template_len);
+
+	default:
+	  return ARGP_ERR_UNKNOWN;
+	}
+      return 0;
+    }
+  struct argp argp = { options, parse_opt, args_doc, doc };
+
+  /* Parse our command line arguments.  */
+  argp_parse (&argp, argc, argv, 0, 0, 0);
+    
+  task_get_bootstrap_port (mach_task_self (), &bootstrap);
+  netfs_init ();
+
+  /* Create the root node (some attributes initialized below).  */
+  netfs_root_node = netfs_make_node (&root_nn);
+  if (! netfs_root_node)
+    error (5, ENOMEM, "Cannot create root node");
+
+  err = maptime_map (0, 0, &usermux_maptime);
+  if (err)
+    error (6, err, "Cannot map time");
+
+  /* Handshake with the party trying to start the translator.  */
+  mux.underlying = netfs_startup (bootstrap, 0);
+
+  /* We inherit various attributes from the node underlying this translator. */
+  err = io_stat (mux.underlying, &ul_stat);
+  if (err)
+    error (7, err, "Cannot stat underlying node");
+
+  /* MUX.stat_template contains some fields that are inherited by all nodes
+     we create.  */
+  mux.stat_template.st_uid = ul_stat.st_uid;
+  mux.stat_template.st_gid = ul_stat.st_gid;
+  mux.stat_template.st_author = ul_stat.st_author;
+  mux.stat_template.st_fsid = getpid ();
+  mux.stat_template.st_nlink = 1;
+  mux.stat_template.st_fstype = FSTYPE_MISC;
+
+  /* We implement symlinks directly, and everything else as a real
+     translator.  */
+  if (strcmp (mux.trans_template, _HURD_SYMLINK) == 0)
+    mux.stat_template.st_mode = S_IFLNK | 0666;
+  else
+    mux.stat_template.st_mode = S_IFREG | S_IPTRANS | 0666;
+
+  /* Initialize the root node's stat information.  */
+  netfs_root_node->nn_stat = mux.stat_template;
+  netfs_root_node->nn_stat.st_ino = 2;
+  netfs_root_node->nn_stat.st_mode =
+    S_IFDIR | (ul_stat.st_mode & ~S_IFMT & ~S_ITRANS);
+
+  fshelp_touch (&netfs_root_node->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
+		usermux_maptime);
+  
+  for (;;)			/* ?? */
+    netfs_server_loop ();
+}