Correct test for native largefiles. We need big unsigned long as well

ChangeLog

@@ -12,6 +12,9 @@ Version NEXT
 	  inetd to work correctly using fspd socket activation.
 	fspd exits with err 8 if can't write pidfile after forking
 	add error exit 9 if fspd can't send back reply to client
+	correct check for native largefiles. Because we are using unsigned
+	  long internaly as pointer to offset for portability, we have to
+	  be sure that usingned long is 8 or more bytes long
 
 Version 2.8.1b29 - 24 Aug 2019
 	added scons command line argument without-fspscan=yes for building

SConstruct

@@ -84,7 +84,8 @@ conf = Configure(env,{'checkForCCOption':checkForCCOption,
 		      'checkForBuildingServer':checkForBuildingServer,
 		      'checkForBuildingFspscan':checkForBuildingFspscan,
 		      'checkDSSSLProcessor':checkDSSSLProcessor,
-		      'findDocbookStylesheets':findDocbookStylesheets
+		      'findDocbookStylesheets':findDocbookStylesheets,
+		      'checkForLargeFiles':enableLargeFiles
 	 	      })
 if not conf.CheckCC(): Exit(1)
 # check for CC options
@@ -143,7 +144,7 @@ if conf.CheckCHeader('utmpx.h'):
     conf.env.Append(CPPFLAGS = '-DHAVE_UTMPX_H')    
 if not conf.CheckType("union semun", "#include <sys/types.h>\n#include <sys/ipc.h>\n#include <sys/sem.h>",'c'):
        conf.env.Append(CPPFLAGS = "-D_SEM_SEMUN_UNDEFINED=1")
-enableLargeFiles(conf)
+conf.checkForLargeFiles(conf)
 conf.checkForLockingType(conf)
 if conf.checkReliableSignals():
     conf.env.Append(CPPFLAGS = '-DRELIABLE_SIGNALS')

TODO

@@ -12,7 +12,6 @@ TESTSUITE NEEDED:
 Write a simple FSP protocol test suite using one
   of its client libraries (Java, C, Python, Perl)
 automatic test for remote buffer overflows
-Test if >2GB files but <4GB works correctly with and without --disable-largefile
 
 POSSIBLE SECURITY BUG:
 symlink to FILE can escape from FSP root directory. OLD known problem.

site_scons/largefiles.py

@@ -1,16 +1,17 @@
 #
 # SCons Largefile enablement
 #
-# Version 1.2
-# 16-Aug-2019
+# Version 1.3
+# 06-Jun-2020
 #
 
-def enableLargeFiles(conf):
+def enableLargeFiles(check,conf):
     """Tries to enable 64-bit off_t on linux platform"""
     fseeko=conf.CheckFunc('fseeko')
     if fseeko:
         conf.env.Append(CPPFLAGS = '-DHAVE_FSEEKO')
     offt=conf.CheckTypeSize('off_t','#include <stdio.h>\n#include <sys/types.h>')
+    ulong=conf.CheckTypeSize('unsigned long')
     if offt<8 and offt>0:
         flags=conf.env.Dictionary()['CPPFLAGS']
         conf.env.Append(CPPFLAGS='-D_FILE_OFFSET_BITS=64')
@@ -22,9 +23,10 @@ def enableLargeFiles(conf):
          #set default value to 4
          offt=4
     conf.env.Append(CPPFLAGS = '-DSIZEOF_OFF_T='+str(offt))
-    if fseeko and int(offt)>=8:
+    check.Message("Checking if we have native large files ...")
+    if fseeko and int(offt)>=8 and int(ulong)>=8:
        conf.env.Append(CPPFLAGS = '-DNATIVE_LARGEFILES')
        rc=True
     else:
        rc=False
-    return rc
+    check.Result(rc)