idmap.c for ldap caching and configuration

struct idmap_context contains configuration data (struct idmap_config), a cache for users, and a cache for groups.  idmap_context is declared in idmap.c, and only available as an opaque pointer (nfs41_idmapper) elsewhere.  similarly, Winldap.h is only included by idmap.c, and not needed elsewhere

nfs41_idmap_create() allocates the idmap_context, loads the configuration from file, and calls ldap_init().  it does not call ldap_connect(); we'll still be able to start the daemon if ldap isn't configured, or the ldap server is down.  calling ldap_connect() is optional, as any ldap operation that requires a connection will establish it internally.  this behavior, along with the LDAP_OPT_AUTO_RECONNECT option (defaults to on), means that we shouldn't have to maintain a separate connection for each thread

nfs41_idmap_*() functions return windows errors codes.  LDAP_RETCODEs are mapped to windows errors with LdapMapErrorToWin32()

the user and group caches share a common generic interface in struct idmap_cache, which uses a linked list for storage, and protects access with a SRWLOCK.  expiration of cache entries can be adjusted by the config option 'cache_ttl'

struct config_option g_options[] is a table of available config options and their default values.  this patch adds a 'ms-nfs41-idmap.conf' file with all possible options set to default values, and commented out.  the daemon expects to find this file under c:\etc\, and won't start if it can't be opened or parsed

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>

build.vc10/daemon.vcxproj

@@ -105,7 +105,7 @@
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;wldap32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <TargetMachine>MachineX86</TargetMachine>
@@ -131,7 +131,7 @@
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;kernel32.lib;advapi32.lib;shell32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;wldap32.lib;kernel32.lib;advapi32.lib;shell32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <TargetMachine>MachineX64</TargetMachine>
@@ -154,7 +154,7 @@
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;wldap32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <OptimizeReferences>true</OptimizeReferences>
@@ -182,7 +182,7 @@
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>ws2_32.lib;iphlpapi.lib;wldap32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <OptimizeReferences>true</OptimizeReferences>
@@ -195,6 +195,7 @@
     <ClCompile Include="..\daemon\callback_server.c" />
     <ClCompile Include="..\daemon\daemon_debug.c" />
     <ClCompile Include="..\daemon\getattr.c" />
+    <ClCompile Include="..\daemon\idmap.c" />
     <ClCompile Include="..\daemon\lock.c" />
     <ClCompile Include="..\daemon\lookup.c" />
     <ClCompile Include="..\daemon\mount.c" />
@@ -227,6 +228,7 @@
   <ItemGroup>
     <ClInclude Include="..\daemon\daemon_debug.h" />
     <ClInclude Include="..\daemon\from_kernel.h" />
+    <ClInclude Include="..\daemon\idmap.h" />
     <ClInclude Include="..\daemon\list.h" />
     <ClInclude Include="..\daemon\name_cache.h" />
     <ClInclude Include="..\daemon\nfs41.h" />

build.vc10/daemon.vcxproj.filters

@@ -110,6 +110,9 @@
     <ClCompile Include="..\daemon\symlink.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\daemon\idmap.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\daemon\daemon_debug.h">
@@ -160,6 +163,9 @@
     <ClInclude Include="..\daemon\service.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\daemon\idmap.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\daemon\sources">

daemon/idmap.h

@@ -0,0 +1,69 @@
+/* Copyright (c) 2010
+ * The Regents of the University of Michigan
+ * All Rights Reserved
+ *
+ * Permission is granted to use, copy and redistribute this software
+ * for noncommercial education and research purposes, so long as no
+ * fee is charged, and so long as the name of the University of Michigan
+ * is not used in any advertising or publicity pertaining to the use
+ * or distribution of this software without specific, written prior
+ * authorization.  Permission to modify or otherwise create derivative
+ * works of this software is not granted.
+ *
+ * This software is provided as is, without representation or warranty
+ * of any kind either express or implied, including without limitation
+ * the implied warranties of merchantability, fitness for a particular
+ * purpose, or noninfringement.  The Regents of the University of
+ * Michigan shall not be liable for any damages, including special,
+ * indirect, incidental, or consequential damages, with respect to any
+ * claim arising out of or in connection with the use of the software,
+ * even if it has been or is hereafter advised of the possibility of
+ * such damages.
+ */
+
+#ifndef IDMAP_H
+#define IDMAP_H
+
+#include "nfs41_types.h"
+
+
+/* idmap.c */
+typedef struct idmap_context nfs41_idmapper;
+
+int nfs41_idmap_create(
+    nfs41_idmapper **context_out);
+
+void nfs41_idmap_free(
+    nfs41_idmapper *context);
+
+
+int nfs41_idmap_name_to_ids(
+    nfs41_idmapper *context,
+    const char *username,
+    uid_t *uid_out,
+    gid_t *gid_out);
+
+int nfs41_idmap_uid_to_name(
+    nfs41_idmapper *context,
+    uid_t uid,
+    char *name_out,
+    size_t len);
+
+int nfs41_idmap_principal_to_ids(
+    nfs41_idmapper *context,
+    const char *principal,
+    uid_t *uid_out,
+    gid_t *gid_out);
+
+int nfs41_idmap_group_to_gid(
+    nfs41_idmapper *context,
+    const char *name,
+    gid_t *gid_out);
+
+int nfs41_idmap_gid_to_group(
+    nfs41_idmapper *context,
+    gid_t gid,
+    char *name_out,
+    size_t len);
+
+#endif /* !IDMAP_H */

daemon/sources

@@ -5,7 +5,7 @@ SOURCES=nfs41_daemon.c daemon_debug.c nfs41_ops.c nfs41_compound.c nfs41_xdr.c \
 	mount.c open.c readwrite.c lock.c readdir.c getattr.c setattr.c upcall.c \
 	nfs41_rpc.c util.c pnfs_layout.c pnfs_device.c pnfs_debug.c pnfs_io.c \
 	name_cache.c namespace.c rbtree.c volume.c callback_server.c callback_xdr.c \
-	service.c symlink.c
+	service.c symlink.c idmap.c
 UMTYPE=console
 USE_LIBCMT=1
 #USE_MSVCRT=1

ms-nfs41-idmap.conf

@@ -0,0 +1,20 @@
+# ldap server information
+#ldap_hostname="localhost"
+#ldap_port="389"
+#ldap_version="3"
+#ldap_timeout="5"
+
+# ldap schema information
+#ldap_base="cn=localhost"
+
+#ldap_class_users="user"
+#ldap_class_groups="group"
+
+#ldap_attr_username="cn"
+#ldap_attr_groupname="cn"
+#ldap_attr_gssAuthName="gssAuthName"
+#ldap_attr_uidNumber="uidNumber"
+#ldap_attr_gidNumber="gidNumber"
+
+# caching configuration
+#cache_ttl="60"