%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_PreParse_scanner_state_t *"
/*
* The language we're scanning is case-insensitive.
*/
%option caseless
/*
* Prefix scanner routines with "Dtd_PreParse_" rather than "yy", so this
* scanner can coexist with other scanners.
*/
%option prefix="Dtd_PreParse_"
%option outfile="dtd_preparse.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_preparse.l
*
* an XML dissector for wireshark
*
* DTD Preparser - import a dtd file into a GString
* including files, removing comments
* and resolving %entities;
*
* 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 <errno.h>
#include <stdio.h>
#include "dtd.h"
#include <wsutil/file_util.h>
/*
* Disable diagnostics in the code generated by Flex.
*/
DIAG_OFF_FLEX()
#define ECHO g_string_append(yyextra->current,yytext);
struct _dtd_preparse_scanner_state {
const char* dtd_dirname;
const char* filename;
unsigned linenum;
GString* error;
GHashTable* entities;
GString* current;
GString* output;
char* entity_name;
};
static const char* replace_entity(Dtd_PreParse_scanner_state_t* state, char* s);
#define YY_USER_INIT { \
BEGIN OUTSIDE; \
}
/*
* 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_PreParse_alloc(size, yyscanner) (void *)malloc(size)
#define Dtd_PreParse_realloc(ptr, size, yyscanner) (void *)realloc((char *)(ptr), (size))
#define Dtd_PreParse_free(ptr, yyscanner) free((char *)ptr)
%}
xmlpi_start "<?"
xmlpi_stop "?>"
xmlpi_chars .
comment_start "<!--"
comment_stop "-->"
special_start "<!"
special_stop ">"
entity_start "<!"[[:blank:]\n]*entity[[:blank:]\n]*"%"
system SYSTEM
filename [^"]+
name [A-Za-z][-:A-Za-z0-9_\.]*
quote "\""
percent [%]
escaped_quote "\\\""
non_quote [^"%]+
avoid_editor_bug ["]
entity [%&][A-Za-z][-A-Za-z0-9_]*;
whitespace [[blank:]]+
newline \n
%START OUTSIDE IN_COMMENT IN_ENTITY NAMED_ENTITY IN_QUOTE ENTITY_DONE XMLPI
%%
{entity} if (yyextra->current) g_string_append_printf(yyextra->current,"%s\n%s\n",replace_entity(yyextra, yytext),dtd_location(yyextra));
{whitespace} if (yyextra->current) g_string_append(yyextra->current," ");
<OUTSIDE>{xmlpi_start} { g_string_append(yyextra->current,yytext); BEGIN XMLPI; }
<XMLPI>{xmlpi_chars} { g_string_append(yyextra->current,yytext); }
<XMLPI>{newline} { g_string_append(yyextra->current,yytext); }
<XMLPI>{xmlpi_stop} { g_string_append(yyextra->current,yytext); BEGIN OUTSIDE; }
<OUTSIDE>{comment_start} { yyextra->current = NULL; BEGIN IN_COMMENT; }
<IN_COMMENT>[^-]? |
<IN_COMMENT>[-] ;
<IN_COMMENT>{comment_stop} { yyextra->current = yyextra->output; BEGIN OUTSIDE; }
{newline} {
yyextra->linenum++;
if (yyextra->current) g_string_append_printf(yyextra->current,"%s\n",dtd_location(yyextra));
}
<OUTSIDE>{entity_start} { BEGIN IN_ENTITY; }
<IN_ENTITY>{name} { yyextra->entity_name = ws_strdup_printf("%%%s;",yytext); BEGIN NAMED_ENTITY; }
<NAMED_ENTITY>{quote} { yyextra->current = g_string_new(dtd_location(yyextra)); BEGIN IN_QUOTE; }
<IN_QUOTE>{quote} { g_hash_table_insert(yyextra->entities,yyextra->entity_name,yyextra->current); BEGIN ENTITY_DONE; }
<IN_QUOTE>{percent} |
<IN_QUOTE>{non_quote} |
<IN_QUOTE>{escaped_quote} g_string_append(yyextra->current,yytext);
<NAMED_ENTITY>{system} {
g_string_append_printf(yyextra->error,"at %s:%u: file inclusion is not supported!", yyextra->filename, yyextra->linenum);
yyterminate();
}
<ENTITY_DONE>{special_stop} { yyextra->current = yyextra->output; g_string_append(yyextra->current,"\n"); BEGIN OUTSIDE; }
%%
/*
* Turn diagnostics back on, so we check the code that we've written.
*/
DIAG_ON_FLEX()
static const char* replace_entity(Dtd_PreParse_scanner_state_t* state, char* entity) {
GString* replacement;
*entity = '%';
replacement = (GString*)g_hash_table_lookup(state->entities,entity);
if (replacement) {
return replacement->str;
} else {
g_string_append_printf(state->error,"dtd_preparse: in file '%s': entity %s does not exists\n", state->filename, entity);
return "";
}
}
const char* dtd_location(Dtd_PreParse_scanner_state_t* state) {
static char* loc = NULL;
g_free(loc);
if (!state) return NULL;
loc = ws_strdup_printf("<? wireshark:location %s:%u ?>", state->filename, state->linenum);
return loc;
}
static gboolean free_gstring_hash_items(void *k,void *v,void *p _U_) {
g_free(k);
g_string_free((GString*)v,true);
return true;
}
extern GString* dtd_preparse(const char* dname,const char* fname, GString* err) {
char* fullname = ws_strdup_printf("%s%c%s",dname,G_DIR_SEPARATOR,fname);
FILE *in;
yyscan_t scanner;
Dtd_PreParse_scanner_state_t state;
in = ws_fopen(fullname,"r");
if (!in) {
if (err)
g_string_append_printf(err, "Could not open file: '%s', error: %s",fullname,g_strerror(errno));
g_free(fullname);
return NULL;
}
if (Dtd_PreParse_lex_init(&scanner) != 0) {
if (err)
g_string_append_printf(err, "Can't initialize scanner: %s",
strerror(errno));
fclose(in);
g_free(fullname);
return NULL;
}
Dtd_PreParse_set_in(in, scanner);
state.dtd_dirname = dname;
state.filename = fname;
state.linenum = 1;
state.error = err;
state.entities = g_hash_table_new(g_str_hash,g_str_equal);
state.current = state.output = g_string_new(dtd_location(&state));
state.entity_name = NULL;
/* Associate the state with the scanner */
Dtd_PreParse_set_extra(&state, scanner);
Dtd_PreParse_lex(scanner);
Dtd_PreParse_lex_destroy(scanner);
fclose(in);
g_hash_table_foreach_remove(state.entities,free_gstring_hash_items,NULL);
g_hash_table_destroy(state.entities);
g_free(fullname);
return state.output;
}