Infrastructure for modularizing protocol analyzers.

There's now a new directory "src/protocols/", and the plan is for each
protocol analyzer to eventually have its own subdirectory in there
that contains everything it defines (C++/pac/bif). The infrastructure
to make that happen is in place, and two analyzers have been
converted to the new model, HTTP and SSL; there's no further
HTTP/SSL-specific code anywhere else in the core anymore (I believe :-)

Further changes:

    - -N lists available plugins, -NN lists more details on what these
      plugins provide (analyzers, bif elements). (The latter does not
      work for analyzers that haven't been converted yet).

    - *.bif.bro files now go into scripts/base/bif/; and
      scripts/base/bif/plugins/ for bif files provided by plugins.

    - I've factored out the bifcl/binpac CMake magic from
      src/CMakeLists.txt to cmake/{BifCl,Binpac}

    - There's a new cmake/BroPlugin that contains magic to allow
      plugins to have a simple CMakeLists.txt. The hope is that
      eventually the same CMakeLists.txt can be used for compiling a
      plugin either statically or dynamically.

    - bifcl has a new option -c that changes the code it generates so
      that it can be used with a plugin.

TODOs:
    - "make install" is probably broken.
    - Broxygen is probably broken for plugin-defined events.
    - event groups are broken (do we want to keep them?)

src/builtin-func.y

@@ -15,6 +15,7 @@ using namespace std;
 
 extern int line_number;
 extern char* input_filename;
+extern char* plugin;
 
 #define print_line_directive(fp) fprintf(fp, "\n#line %d \"%s\"\n", line_number, input_filename)
 
@@ -265,6 +266,15 @@ void print_event_c_body(FILE *fp)
 	fprintf(fp, "\t} // event generation\n");
 	//fprintf(fp, "%s // end namespace\n", decl.generate_c_namespace_end.c_str());
 	}
+
+void record_bif_item(const char* id, int type)
+	{
+	if ( ! plugin )
+		return;
+
+	fprintf(fp_func_init, "\tbifs.push_back(std::make_pair(\"%s\", %d));\n", id, type);
+	}
+
 %}
 
 %token TOK_LPP TOK_RPP TOK_LPB TOK_RPB TOK_LPPB TOK_RPPB TOK_VAR_ARG
@@ -304,21 +314,6 @@ definitions:	definitions definition opt_ws
 			}
 	|	opt_ws
 			{
-			int n = 1024 + strlen(input_filename);
-			char auto_gen_comment[n];
-
-			snprintf(auto_gen_comment, n,
-				"This file was automatically generated by bifcl from %s.",
-				input_filename);
-
-			fprintf(fp_bro_init, "# %s\n\n", auto_gen_comment);
-			fprintf(fp_func_def, "// %s\n\n", auto_gen_comment);
-			fprintf(fp_func_h, "// %s\n\n", auto_gen_comment);
-			fprintf(fp_func_init, "// %s\n\n", auto_gen_comment);
-			fprintf(fp_netvar_def, "// %s\n\n", auto_gen_comment);
-			fprintf(fp_netvar_h, "// %s\n\n", auto_gen_comment);
-			fprintf(fp_netvar_init, "// %s\n\n", auto_gen_comment);
-
 			fprintf(fp_bro_init, "%s", $1);
 			fprintf(fp_bro_init, "export {\n");
 			}
@@ -362,6 +357,8 @@ type_def:	TOK_TYPE opt_ws TOK_ID opt_ws ':' opt_ws type_def_types opt_ws ';'
 				"\t%s = internal_type(\"%s\")->As%sType();\n",
 				decl.c_fullname.c_str(), decl.bro_fullname.c_str(),
 				type_name.c_str());
+
+			record_bif_item(decl.bro_fullname.c_str(), 5);
 			}
 	;
 
@@ -402,6 +399,8 @@ enum_def:	enum_def_1 enum_list TOK_RPB
 			fprintf(fp_netvar_init,
 				"\t%s = internal_type(\"%s\")->AsEnumType();\n",
 				decl.c_fullname.c_str(), decl.bro_fullname.c_str());
+
+			record_bif_item(decl.bro_fullname.c_str(), 5);
 			}
 	;
 
@@ -456,6 +455,8 @@ const_def:	TOK_CONST opt_ws TOK_ID opt_ws ':' opt_ws TOK_ID opt_ws ';'
 			fprintf(fp_netvar_init, "\t%s = internal_const_val(\"%s\")%s;\n",
 				decl.c_fullname.c_str(), decl.bro_fullname.c_str(),
 				accessor);
+
+			record_bif_item(decl.bro_fullname.c_str(), 3);
 			}
 
 
@@ -545,6 +546,8 @@ head_1:		TOK_ID opt_ws arg_begin
 				fprintf(fp_func_def,
 					"Val* %s(Frame* frame, val_list* %s)",
 					decl.c_fullname.c_str(), arg_list_name);
+
+				record_bif_item(decl.bro_fullname.c_str(), 1);
 				}
 			else if ( definition_type == EVENT_DEF )
 				{
@@ -561,6 +564,8 @@ head_1:		TOK_ID opt_ws arg_begin
 					"\t%s = internal_handler(\"%s\");\n",
 					decl.c_fullname.c_str(), decl.bro_fullname.c_str());
 
+				record_bif_item(decl.bro_fullname.c_str(), 2);
+
 				// C++ prototypes of bro_event_* functions will
 				// be generated later.
 				}