path: root/epan/dtd_parse.l

%top {
/* Include this before everything else, for various large-file definitions */
#include "config.h"
#include <wireshark.h>
}

/*
 * We want a reentrant scanner.
 */
%option reentrant

/*
 * We don't use input, so don't generate code for it.
 */
%option noinput

/*
 * We don't use unput, so don't generate code for it.
 */
%option nounput

/*
 * We don't read interactively from the terminal.
 */
%option never-interactive

/*
 * We want to stop processing when we get to the end of the input.
 */
%option noyywrap

/*
 * The type for the state we keep for a scanner.
 */
%option extra-type="Dtd_Parse_scanner_state_t *"

/*
 * Prefix scanner routines with "Dtd_Parse_" rather than "yy", so this scanner
 * can coexist with other scanners.
 */
%option prefix="Dtd_Parse_"

%option outfile="dtd_parse.c"

/*
 * We have to override the memory allocators so that we don't get
 * "unused argument" warnings from the yyscanner argument (which
 * we don't use, as we have a global memory allocator).
 *
 * We provide, as macros, our own versions of the routines generated by Flex,
 * which just call malloc()/realloc()/free() (as the Flex versions do),
 * discarding the extra argument.
 */
%option noyyalloc
%option noyyrealloc
%option noyyfree

%{

	/* dtd_parse.l
	* an XML dissector for Wireshark
	* lexical analyzer for DTDs
	*
	* Copyright 2004, Luis E. Garcia Ontanon <luis@ontanon.org>
	*
	* Wireshark - Network traffic analyzer
	* By Gerald Combs <gerald@wireshark.org>
	* Copyright 1998 Gerald Combs
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
	*/

#include <glib.h>
#include <string.h>

#include "dtd.h"
#include "dtd_grammar.h"
#include "dtd_parse.h"

/*
 * Disable diagnostics in the code generated by Flex.
 */
DIAG_OFF_FLEX()

	struct _proto_xmlpi_attr {
		const char* name;
		void (*act)(char*);
	};

	typedef struct {
		GString* input_string;
		size_t offsetx;
		size_t len;
		void* pParser;
		char* location;
		char* attr_name;
	} Dtd_Parse_scanner_state_t;

	static size_t my_yyinput(Dtd_Parse_scanner_state_t *state,char* buff,size_t size);

	static dtd_token_data_t* new_token(char*,char*);

	static dtd_build_data_t* build_data;

	static void set_proto_name (char* val) { g_free(build_data->proto_name); build_data->proto_name = g_strdup(val); }
	static void set_media_type (char* val) { g_free(build_data->media_type); build_data->media_type = g_strdup(val); }
	static void set_proto_root (char* val) { g_free(build_data->proto_root); build_data->proto_root = g_strdup(val); }
	static void set_description (char* val) { g_free(build_data->description); build_data->description = g_strdup(val); }
	static void set_recursive (char* val) { build_data->recursion = ( g_ascii_strcasecmp(val,"yes") == 0 ) ? true : false; }

#ifdef DEBUG_DTD_PARSER
#define DEBUG_DTD_TOKEN fprintf(stderr,"->%s (%i)%s\n",location,token_type,yytext)
#else
#define DEBUG_DTD_TOKEN
#endif

#define DTD_PARSE(token_type) \
	{   DEBUG_DTD_TOKEN; \
		DtdParse(yyextra->pParser, (token_type), new_token(yytext, yyextra->location), build_data); \
		if(build_data->error->len > 0) yyterminate(); \
	}


#define YY_INPUT(buff,result,max_size) ( (result) = my_yyinput(yyextra,(buff),(max_size)) )
#define YY_USER_INIT BEGIN DTD;

/*
 * Flex (v 2.5.35) uses this symbol to "exclude" unistd.h
 */
#ifdef _WIN32
#define YY_NO_UNISTD_H
#endif

/*
 * Sleazy hack to suppress compiler warnings in yy_fatal_error().
 */
#define YY_EXIT_FAILURE ((void)yyscanner, 2)

/*
 * Macros for the allocators, to discard the extra argument.
 */
#define Dtd_Parse_alloc(size, yyscanner)	(void *)malloc(size)
#define Dtd_Parse_realloc(ptr, size, yyscanner)	(void *)realloc((char *)(ptr), (size))
#define Dtd_Parse_free(ptr, yyscanner)		free((char *)ptr)

%}

comment_start "<!--"
comment_stop "-->"

start_xmlpi "<?"

location_xmlpi "wireshark:location"
protocol_xmlpi "wireshark:protocol"

get_attr_quote =[:blank:]*["]
avoid_editor_bug ["]

get_location_xmlpi  [^[:blank:]]+

stop_xmlpi "?>"

notation_tag       "<!"[:blank:]*NOTATION

special_start  "<!"
special_stop   ">"
whitespace     [[:blank:]\r\n]+
newline        \n
attlist_kw     ATTLIST
doctype_kw     DOCTYPE
element_kw     ELEMENT

pcdata         #PCDATA
any            ANY
cdata          #CDATA

iD             ID
idref          IDREF
idrefs         IDREFS
nmtoken        NMTOKEN
nmtokens       NMTOKENS
entity         ENTITY
entities       ENTITIES
notation       NOTATION
cdata_t        CDATA

empty          EMPTY
defaulT        #DEFAULT
fixed          #FIXED
required       #REQUIRED
implied        #IMPLIED

star           "*"
question       "?"
plus           "+"
open_parens    "("
close_parens   ")"
open_bracket   "["
close_bracket  "]"
comma          ","
pipe           "|"
dquote         ["]

name           [A-Za-z0-9][-a-zA-Z0-9_]*
dquoted        ["][^\"]*["]
squoted        ['][^\']*[']

%START DTD XMLPI LOCATION DONE PROTOCOL GET_ATTR_QUOTE GET_ATTR_VAL GET_ATTR_CLOSE_QUOTE IN_COMMENT IN_NOTATION
%%

{whitespace}            ;


<DTD>{comment_start}		{ BEGIN IN_COMMENT; }
<IN_COMMENT>[^-]?				|
<IN_COMMENT>[-]					;
<IN_COMMENT>{comment_stop}		{ BEGIN DTD; }

<DTD>{notation_tag} { BEGIN IN_NOTATION; }
<IN_NOTATION>[^>]  ;
<IN_NOTATION>{special_stop} { BEGIN DTD; }

<DTD>{start_xmlpi}		{
	BEGIN XMLPI;
}

<XMLPI>{location_xmlpi} {
	BEGIN LOCATION;
}

<XMLPI>{protocol_xmlpi} {
	BEGIN PROTOCOL;
}

<XMLPI><.> ;
<XMLPI>{stop_xmlpi} BEGIN DTD;

<LOCATION>{get_location_xmlpi} {
	g_free(yyextra->location);
	yyextra->location = g_strdup(yytext);
	BEGIN DONE;
}

<DONE>{stop_xmlpi}  BEGIN DTD;

<PROTOCOL>{name} {
	yyextra->attr_name = g_ascii_strdown(yytext, -1);
	BEGIN GET_ATTR_QUOTE;
}

<GET_ATTR_QUOTE>{get_attr_quote} { BEGIN GET_ATTR_VAL; }

<GET_ATTR_QUOTE>. {
	g_string_append_printf(build_data->error,
					"error in wireshark:protocol xmpli at %s : could not find attribute value!",
					yyextra->location);
	yyterminate();
}

<GET_ATTR_VAL>[^"]+ {
	/*"*/
	struct _proto_xmlpi_attr* pa;
	bool got_it = false;
	static struct _proto_xmlpi_attr proto_attrs[] =
	{
		{ "proto_name", set_proto_name },
		{ "media", set_media_type },
		{ "root", set_proto_root },
		{ "description", set_description },
		{ "hierarchy", set_recursive },
		{NULL,NULL}
	};

	for(pa = proto_attrs; pa->name; pa++) {
		if (g_ascii_strcasecmp(yyextra->attr_name,pa->name) == 0) {
			pa->act(yytext);
			got_it = true;
			break;
		}
	}

	if (! got_it) {
		g_string_append_printf(build_data->error,
						"error in wireshark:protocol xmpli at %s : no such parameter %s!",
						yyextra->location, yyextra->attr_name);
		g_free(yyextra->attr_name);
		yyterminate();
	}

	g_free(yyextra->attr_name);

	BEGIN GET_ATTR_CLOSE_QUOTE;
}

<GET_ATTR_CLOSE_QUOTE>{dquote} { BEGIN PROTOCOL;}

<PROTOCOL>{stop_xmlpi} BEGIN DTD;

<DTD>{special_start}         { DTD_PARSE(TOKEN_TAG_START); }
<DTD>{special_stop}          { DTD_PARSE(TOKEN_TAG_STOP); }

<DTD>{attlist_kw}            { DTD_PARSE(TOKEN_ATTLIST_KW); }
<DTD>{element_kw}            { DTD_PARSE(TOKEN_ELEMENT_KW); }
<DTD>{doctype_kw}            { DTD_PARSE(TOKEN_DOCTYPE_KW); }

<DTD>{pcdata}                { DTD_PARSE(TOKEN_ELEM_DATA); }
<DTD>{any}                   { DTD_PARSE(TOKEN_ELEM_DATA); }
<DTD>{cdata}                 { DTD_PARSE(TOKEN_ELEM_DATA); }
<DTD>{empty}				 { DTD_PARSE(TOKEN_EMPTY_KW); }

<DTD>{iD}			         { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{idref}                 { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{idrefs}                { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{nmtoken}               { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{nmtokens}              { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{entity}                { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{entities}              { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{notation}              { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{cdata_t}               { DTD_PARSE(TOKEN_ATT_TYPE); }
<DTD>{defaulT}               { DTD_PARSE(TOKEN_ATT_DEF_WITH_VALUE); }
<DTD>{fixed}                 { DTD_PARSE(TOKEN_ATT_DEF_WITH_VALUE); }
<DTD>{required}              { DTD_PARSE(TOKEN_ATT_DEF); }
<DTD>{implied}               { DTD_PARSE(TOKEN_ATT_DEF); }

<DTD>{star}                  { DTD_PARSE(TOKEN_STAR); }
<DTD>{question}              { DTD_PARSE(TOKEN_QUESTION); }
<DTD>{plus}                  { DTD_PARSE(TOKEN_PLUS); }
<DTD>{comma}                  { DTD_PARSE(TOKEN_COMMA); }
<DTD>{open_parens}           { DTD_PARSE(TOKEN_OPEN_PARENS); }
<DTD>{close_parens}          { DTD_PARSE(TOKEN_CLOSE_PARENS); }
<DTD>{open_bracket}          { DTD_PARSE(TOKEN_OPEN_BRACKET); }
<DTD>{close_bracket}         { DTD_PARSE(TOKEN_CLOSE_BRACKET); }
<DTD>{pipe}                  { DTD_PARSE(TOKEN_PIPE); }

<DTD>{dquoted}               |
<DTD>{squoted}               { DTD_PARSE(TOKEN_QUOTED); }
<DTD>{name}                  { DTD_PARSE(TOKEN_NAME); }

%%

/*
 * Turn diagnostics back on, so we check the code that we've written.
 */
DIAG_ON_FLEX()

static dtd_token_data_t* new_token(char* text, char* location) {
	dtd_token_data_t* t = g_new(dtd_token_data_t,1);

	t->text = g_strdup(text);
	t->location = g_strdup(location);

	return t;
}


static size_t my_yyinput(Dtd_Parse_scanner_state_t *state, char* buff, size_t size) {

	if (state->offsetx >= state->len) {
		return YY_NULL;
	} else if (state->offsetx + size <= state->len) {
		memcpy(buff, state->input_string->str + state->offsetx, size);
		state->offsetx += size;
		return size;
	} else {
		size = state->len - state->offsetx;
		memcpy(buff, state->input_string->str + state->offsetx, size);
		state->offsetx = state->len;
		return size;
	}
}

extern dtd_build_data_t* dtd_parse(GString* s) {
	yyscan_t scanner;
	Dtd_Parse_scanner_state_t state;

	if (Dtd_Parse_lex_init(&scanner) != 0) {
#ifdef DEBUG_DTD_PARSER
		fprintf(stderr, "Can't initialize scanner: %s\n",
		    strerror(errno));
#endif
		return NULL;
	}

	state.input_string = s;
	state.offsetx = 0;
	state.len = state.input_string->len;

	state.pParser = DtdParseAlloc(g_malloc);

#ifdef DEBUG_DTD_PARSER
	DtdParseTrace(stderr, ">>");
#endif

	build_data = g_new(dtd_build_data_t,1);

	build_data->proto_name = NULL;
	build_data->media_type = NULL;
	build_data->description = NULL;
	build_data->proto_root = NULL;
	build_data->recursion = false;

	build_data->elements = g_ptr_array_new();
	build_data->attributes = g_ptr_array_new();

	build_data->error = g_string_new("");

	state.location = NULL;
	state.attr_name = NULL;

	/* Associate the state with the scanner */
	Dtd_Parse_set_extra(&state, scanner);

	Dtd_Parse_lex(scanner);

	DtdParse(state.pParser, 0, NULL, build_data);

	Dtd_Parse_lex_destroy(scanner);

	g_free(state.location);

	DtdParseFree(state.pParser, g_free);

	return build_data;
}