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">