--enable-gccprofile sets -pg flag detect presence of pcre recursion

configure.in

@@ -158,6 +158,17 @@ AC_INIT(configure.in)
         CFLAGS="${CFLAGS} ${SECCFLAGS}"
         LDFLAGS="${LDFLAGS} ${SECLDFLAGS}"
     fi
+
+#enable profile generation
+    AC_ARG_ENABLE(gccprofile,
+            [  --enable-gccprofile Enable gcc profile info i.e -pg flag is set],
+            [ enable_gccprofile=yes
+            ])
+
+    if test "$enable_gccprofile" = "yes"; then
+    CFLAGS="${CFLAGS} -pg"
+    fi
+
 #libpcre
     AC_ARG_WITH(libpcre_includes,
             [  --with-libpcre-includes=DIR  libpcre include directory],
@@ -187,6 +198,20 @@ AC_INIT(configure.in)
     exit 1
     fi
 
+   AC_TRY_COMPILE([ #include <pcre.h> ],
+   [ int eo; eo |= PCRE_EXTRA_MATCH_LIMIT_RECURSION; ],
+   [ pcre_match_limit_recursion_available=yes ], [:]
+   )
+   if test "$pcre_match_limit_recursion_available" != "yes"; then
+    CFLAGS="${CFLAGS} -DMISSING_PCRE_MATCH_RLIMIT"
+    echo
+    echo "   Warning! pcre extra opt PCRE_EXTRA_MATCH_LIMIT_RECURSION not found"
+    echo "   This could lead to potential DoS please upgrade to pcre >= 6.5"
+    echo "   Continuing for now...."
+    echo "   from www.pcre.org."
+    echo
+   fi
+
 #libyaml
     AC_ARG_WITH(libyaml_includes,
             [  --with-libyaml-includes=DIR  libyaml include directory],

src/detect-pcre.c

@@ -358,21 +358,21 @@ DetectPcreData *DetectPcreParse (char *regexstr)
                 pd->sd->match_limit = pcre_match_limit;
                 pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT;
             }
-
+#ifndef MISSING_PCRE_MATCH_RLIMIT
             if(pcre_match_limit_recursion >= -1)    {
                 pd->sd->match_limit_recursion = pcre_match_limit_recursion;
                 pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
             }
-
+#endif /* MISSING_PCRE_MATCH_RLIMIT */
         }
         else    {
 
             pd->sd->match_limit = MATCH_LIMIT_DEFAULT;
             pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT;
-
+#ifndef MISSING_PCRE_MATCH_RLIMIT
             pd->sd->match_limit_recursion = MATCH_LIMIT_DEFAULT;
             pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
-
+#endif /* MISSING_PCRE_MATCH_RLIMIT */
         }
 
     }