Experimental support for PCRE-sljit enable via --enable-pcre-sljit

configure.in

@@ -290,6 +290,39 @@ AC_INIT(configure.in)
     echo
    fi
 
+    #enable suppot for PCRE-sljit http://sljit.sourceforge.net/pcre.html
+    AC_ARG_ENABLE(pcre-sljit,
+           AS_HELP_STRING([--enable-pcre-sljit], [Enable experimental support for PCRE-sljit]),,[enable_pcre_sljit=no])
+    AS_IF([test "x$enable_pcre_sljit" = "xyes"], [
+           AC_MSG_CHECKING(for PCRE sljit support)
+           AC_TRY_COMPILE([ #include <pcre.h> ],
+             [ const char* regexstr = "(a|b|c|d)";
+             pcre *re;
+             const char *error;
+             pcre_extra *extra;
+             int err_offset;
+             re = pcre_compile(regexstr,0, &error, &err_offset,NULL);
+             extra = pcre_study(re, PCRE_STUDY_JIT_COMPILE, &error);
+             if (!(extra->flags & PCRE_EXTRA_EXECUTABLE_FUNC)) {
+                 printf("\nJIT compiler does not support: %s\n", regexstr);
+             }
+             return 0;],
+           [ pcre_sljit_available=yes ], [:]
+           )
+           if test "$pcre_sljit_available" = "yes"; then
+            AC_MSG_RESULT(yes)
+            CFLAGS="${CFLAGS} -D_PCRE_HAVE_SLJIT"
+           else
+            AC_MSG_RESULT(no)
+            echo
+            echo "   Error! --enable-pcre-sljit set but PCRE_STUDY_JIT_COMPILE not found"
+            echo "   Make sure you use pcre found here "
+            echo "   http://sljit.sourceforge.net/pcre.html"
+            echo
+            exit 1
+           fi
+
+    ])
 #libyaml
     AC_ARG_WITH(libyaml_includes,
             [  --with-libyaml-includes=DIR  libyaml include directory],
@@ -897,4 +930,5 @@ Suricata Configuration:
   GCC Profile enabled:      ${enable_gccprofile}
   Unified native time:      ${enable_unified_native_timeval}
   Non-bundled htp:          ${enable_non_bundled_htp}
+  PCRE sljit:               ${enable_pcre_sljit}
 "

src/detect-pcre.c

@@ -876,12 +876,22 @@ DetectPcreData *DetectPcreParse (char *regexstr)
         SCLogError(SC_ERR_PCRE_COMPILE, "pcre compile of \"%s\" failed at offset %" PRId32 ": %s", regexstr, eo, eb);
         goto error;
     }
-
+#ifdef PCRE_HAVE_SLJIT
+    pd->sd = pcre_study(pd->re, PCRE_STUDY_JIT_COMPILE, &eb);
+    if(eb != NULL)  {
+        SCLogError(SC_ERR_PCRE_STUDY, "pcre study failed : %s", eb);
+        goto error;
+    }
+    if (!(pd->sd->flags & PCRE_EXTRA_EXECUTABLE_FUNC)) {
+        SCLogWarning(SC_ERR_PCRE_STUDY, "JIT compiler does not support: %s", regexstr);
+    }
+#else
     pd->sd = pcre_study(pd->re, 0, &eb);
     if(eb != NULL)  {
         SCLogError(SC_ERR_PCRE_STUDY, "pcre study failed : %s", eb);
         goto error;
     }
+#endif /*PCRE_HAVE_SLJIT*/
 
     if(pd->sd == NULL)
         pd->sd = (pcre_extra *) SCCalloc(1,sizeof(pcre_extra));

src/suricata.c

@@ -431,6 +431,9 @@ void SCPrintBuildInfo(void) {
 #endif
 #ifdef HAVE_HTP_URI_NORMALIZE_HOOK
     strlcat(features, "HAVE_HTP_URI_NORMALIZE_HOOK ", sizeof(features));
+#endif
+#ifdef PCRE_HAVE_SLJIT
+    strlcat(features, "PCRE_SLJIT ", sizeof(features));
 #endif
     if (strlen(features) == 0) {
         strlcat(features, "none", sizeof(features));