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%{
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "asn1parser.h"
#include "asn1p_y.h"
int asn1p_lex(void);
void asn1p_lexer_hack_push_opaque_state(void); /* Used in .y */
void asn1p_lexer_hack_enable_with_syntax(void); /* Used in .y */
void asn1p_lexer_hack_push_encoding_control(void); /* Used in .y */
#define YY_FATAL_ERROR(msg) do { \
fprintf(stderr, \
"lexer error at line %d, " \
"text \"%s\"\n", \
yylineno, yytext); \
exit(1); \
} while(0)
int asn1p_lexer_pedantic_1990 = 0;
int asn1p_lexer_types_year = 0;
int asn1p_lexer_constructs_year = 0;
static int _check_dashes(char *ptr);
static asn1_integer_t asn1p_atoi(char *ptr); /* errno is either 0 or ERANGE */
/*
* Check that the type is defined in the year of the standard choosen.
*/
#define TYPE_LIFETIME(fyr, lyr) \
(!asn1p_lexer_types_year \
|| (fyr && fyr <= asn1p_lexer_types_year) \
|| (lyr && lyr > asn1p_lexer_types_year))
/*
* Check the the construction (or concept, i.e. CLASS) is defined in
* a given year.
*/
#define CONSTRUCT_LIFETIME(fyr, lyr) \
(!asn1p_lexer_constructs_year \
|| (fyr && fyr <= asn1p_lexer_constructs_year) \
|| (lyr && lyr > asn1p_lexer_constructs_year))
/*
* Make sure that the label is compliant with the naming rules.
*/
#define CHECK_DASHES do { \
if(_check_dashes(yytext)) { \
fprintf(stderr, \
"%s: Identifier format invalid: " \
"Improper dash location\n", yytext); \
return -1; \
} } while(0)
/*
* Append quoted string.
*/
#define QAPPEND(text, tlen) do { \
char *prev_text = asn1p_lval.tv_opaque.buf; \
int prev_len = asn1p_lval.tv_opaque.len; \
char *p; \
\
p = malloc((tlen) + prev_len + 1); \
if(p == NULL) return -1; \
\
if(prev_text) memcpy(p, prev_text, prev_len); \
memcpy(p + prev_len, text, tlen); \
p[prev_len + (tlen)] = '\0'; \
\
free(asn1p_lval.tv_opaque.buf); \
asn1p_lval.tv_opaque.buf = p; \
asn1p_lval.tv_opaque.len = (tlen) + prev_len; \
} while(0)
%}
%option never-interactive
%option noinput
%option noyywrap stack
/* Performance penalty is OK */
%option yylineno
/* Controlled from within application */
%option debug
%pointer
%x dash_comment
%x cpp_comment
%x quoted
%x opaque
%x encoding_control
%x with_syntax
/* Newline */
NL [\r\v\f\n]
/* White-space */
WSP [\t\r\v\f\n ]
%%
"--" yy_push_state(dash_comment);
<dash_comment>{
{NL} yy_pop_state();
-- yy_pop_state(); /* End of comment */
- /* Eat single dash */
[^\r\v\f\n-]+ /* Eat */
}
<INITIAL,cpp_comment>"/*" yy_push_state(cpp_comment);
<cpp_comment>{
[^*/] /* Eat */
"*/" yy_pop_state();
. /* Eat */
}
/*
* This is state is being set from corresponding .y module when
* higher-level data is necessary to make proper parsing of the
* underlying data. Thus, we enter the <opaque> state and save
* everything for later processing.
*/
<opaque>{
"{" {
yy_push_state(opaque);
asn1p_lval.tv_opaque.buf = strdup(yytext);
asn1p_lval.tv_opaque.len = yyleng;
return TOK_opaque;
}
"}" {
yy_pop_state();
asn1p_lval.tv_opaque.buf = strdup(yytext);
asn1p_lval.tv_opaque.len = yyleng;
return TOK_opaque;
}
[^{}:=]+ {
asn1p_lval.tv_opaque.buf = strdup(yytext);
asn1p_lval.tv_opaque.len = yyleng;
return TOK_opaque;
}
"::=" {
fprintf(stderr,
"ASN.1 Parser syncronization failure: "
"\"%s\" at line %d must not appear "
"inside value definition\n",
yytext, yylineno);
return -1;
}
[:=] {
asn1p_lval.tv_opaque.buf = strdup(yytext);
asn1p_lval.tv_opaque.len = yyleng;
return TOK_opaque;
}
}
\"[^\"]* {
asn1p_lval.tv_opaque.buf = 0;
asn1p_lval.tv_opaque.len = 0;
QAPPEND(yytext+1, yyleng-1);
yy_push_state(quoted);
}
<quoted>{
\"\" { QAPPEND(yytext, yyleng-1); } /* Add a single quote */
[^\"]+ { QAPPEND(yytext, yyleng); }
\" {
yy_pop_state();
/* Do not append last quote:
// QAPPEND(yytext, yyleng); */
if(asn1p_lexer_pedantic_1990
&& strchr(yytext, '\n')) {
fprintf(stderr, "%s: "
"Newlines are prohibited by ASN.1:1990\n",
asn1p_lval.tv_opaque.buf);
return -1;
}
return TOK_cstring;
}
}
<encoding_control>{
ENCODING-CONTROL {
const char *s = "ENCODING-CONTROL";
const char *p = s + sizeof("ENCODING-CONTROL") - 2;
for(; p >= s; p--) unput(*p);
yy_pop_state();
}
END unput('D'); unput('N'); unput('E'); yy_pop_state();
[^{} \t\r\v\f\n]+
[[:alnum:]]+
. /* Eat everything else */
"\n"
}
'[0-9A-F \t\r\v\f\n]+'H {
/* " \t\r\n" weren't allowed in ASN.1:1990. */
asn1p_lval.tv_str = yytext;
return TOK_hstring;
}
'[01 \t\r\v\f\n]+'B {
/* " \t\r\n" weren't allowed in ASN.1:1990. */
asn1p_lval.tv_str = strdup(yytext);
return TOK_bstring;
}
-[1-9][0-9]* {
asn1p_lval.a_int = asn1p_atoi(yytext);
if(errno == ERANGE)
return -1;
return TOK_number_negative;
}
[1-9][0-9]* {
asn1p_lval.a_int = asn1p_atoi(yytext);
if(errno == ERANGE)
return -1;
return TOK_number;
}
"0" {
asn1p_lval.a_int = asn1p_atoi(yytext);
if(errno == ERANGE)
return -1;
return TOK_number;
}
/*
* Tags
*/
\[(UNIVERSAL[ \t\r\v\f\n]+|APPLICATION[ \t\r\v\f\n]+|PRIVATE[ \t\r\v\f\n]+)?[0-9]+\] {
char *p;
memset(&asn1p_lval.a_tag, 0, sizeof(asn1p_lval.a_tag));
switch(yytext[1]) {
case 'U':
asn1p_lval.a_tag.tag_class = TC_UNIVERSAL;
p = yytext + sizeof("UNIVERSAL") + 1;
break;
case 'A':
asn1p_lval.a_tag.tag_class = TC_APPLICATION;
p = yytext + sizeof("APPLICATION") + 1;
break;
case 'P':
asn1p_lval.a_tag.tag_class = TC_PRIVATE;
p = yytext + sizeof("PRIVATE") + 1;
break;
default:
assert(yytext[1] >= '0' && yytext[1] <= '9');
asn1p_lval.a_tag.tag_class = TC_CONTEXT_SPECIFIC;
p = yytext + 1;
break;
}
asn1p_lval.a_tag.tag_value = asn1p_atoi(p);
if(*p == '0' && asn1p_lval.a_tag.tag_value) {
fprintf(stderr,
"Tag value at line %d "
"cannot start with zero "
"and have multiple digits: \"%s\"\n",
yylineno, yytext);
return -1;
}
return TOK_tag;
}
\[[A-Z]+[ \t\r\v\f\n]+[0-9]+\] {
fprintf(stderr,
"Unsupported tag syntax at line %d: \"%s\"\n",
yylineno, yytext);
return -1;
}
ABSENT return TOK_ABSENT;
/*
ABSTRACT-SYNTAX return TOK_ABSTRACT_SYNTAX;
*/
ALL return TOK_ALL;
ANY {
/* Appeared in 1990, removed in 1997 */
if(TYPE_LIFETIME(1990, 1997))
return TOK_ANY;
fprintf(stderr, "Keyword \"%s\" at line %d "
"is obsolete\n", yytext, yylineno);
REJECT;
}
APPLICATION return TOK_APPLICATION;
AUTOMATIC return TOK_AUTOMATIC;
BEGIN return TOK_BEGIN;
BIT return TOK_BIT;
BMPString {
if(TYPE_LIFETIME(1994, 0))
return TOK_BMPString;
REJECT;
}
BOOLEAN return TOK_BOOLEAN;
BY return TOK_BY;
CHARACTER return TOK_CHARACTER;
CHOICE return TOK_CHOICE;
CLASS return TOK_CLASS;
COMPONENT return TOK_COMPONENT;
COMPONENTS return TOK_COMPONENTS;
CONSRAINED return TOK_CONSTRAINED;
CONTAINING return TOK_CONTAINING;
DEFAULT return TOK_DEFAULT;
DEFINED {
/* Appeared in 1990, removed in 1997 */
if(TYPE_LIFETIME(1990, 1997))
return TOK_DEFINED;
fprintf(stderr, "Keyword \"%s\" at line %d "
"is obsolete\n", yytext, yylineno);
/* Deprecated since */
REJECT;
}
DEFINITIONS return TOK_DEFINITIONS;
EMBEDDED return TOK_EMBEDDED;
ENCODED return TOK_ENCODED;
ENCODING-CONTROL return TOK_ENCODING_CONTROL;
END return TOK_END;
ENUMERATED return TOK_ENUMERATED;
EXCEPT return TOK_EXCEPT;
EXPLICIT return TOK_EXPLICIT;
EXPORTS return TOK_EXPORTS;
EXTENSIBILITY return TOK_EXTENSIBILITY;
EXTERNAL return TOK_EXTERNAL;
FALSE return TOK_FALSE;
FROM return TOK_FROM;
GeneralizedTime return TOK_GeneralizedTime;
GeneralString return TOK_GeneralString;
GraphicString return TOK_GraphicString;
IA5String return TOK_IA5String;
IDENTIFIER return TOK_IDENTIFIER;
IMPLICIT return TOK_IMPLICIT;
IMPLIED return TOK_IMPLIED;
IMPORTS return TOK_IMPORTS;
INCLUDES return TOK_INCLUDES;
INSTANCE return TOK_INSTANCE;
INSTRUCTIONS return TOK_INSTRUCTIONS;
INTEGER return TOK_INTEGER;
INTERSECTION return TOK_INTERSECTION;
ISO646String return TOK_ISO646String;
MAX return TOK_MAX;
MIN return TOK_MIN;
MINUS-INFINITY return TOK_MINUS_INFINITY;
NULL return TOK_NULL;
NumericString return TOK_NumericString;
OBJECT return TOK_OBJECT;
ObjectDescriptor return TOK_ObjectDescriptor;
OCTET return TOK_OCTET;
OF return TOK_OF;
OPTIONAL return TOK_OPTIONAL;
PATTERN return TOK_PATTERN;
PDV return TOK_PDV;
PLUS-INFINITY return TOK_PLUS_INFINITY;
PRESENT return TOK_PRESENT;
PrintableString return TOK_PrintableString;
PRIVATE return TOK_PRIVATE;
REAL return TOK_REAL;
RELATIVE-OID return TOK_RELATIVE_OID;
SEQUENCE return TOK_SEQUENCE;
SET return TOK_SET;
SIZE return TOK_SIZE;
STRING return TOK_STRING;
SYNTAX return TOK_SYNTAX;
T61String return TOK_T61String;
TAGS return TOK_TAGS;
TeletexString return TOK_TeletexString;
TRUE return TOK_TRUE;
TYPE-IDENTIFIER return TOK_TYPE_IDENTIFIER;
UNION return TOK_UNION;
UNIQUE return TOK_UNIQUE;
UNIVERSAL return TOK_UNIVERSAL;
UniversalString {
if(TYPE_LIFETIME(1994, 0))
return TOK_UniversalString;
REJECT;
}
UTCTime return TOK_UTCTime;
UTF8String {
if(TYPE_LIFETIME(1994, 0))
return TOK_UTF8String;
REJECT;
}
VideotexString return TOK_VideotexString;
VisibleString return TOK_VisibleString;
WITH return TOK_WITH;
<INITIAL,with_syntax>&[A-Z][A-Za-z0-9-]* {
CHECK_DASHES;
asn1p_lval.tv_str = strdup(yytext);
return TOK_typefieldreference;
}
<INITIAL,with_syntax>&[a-z][a-zA-Z0-9-]* {
CHECK_DASHES;
asn1p_lval.tv_str = strdup(yytext);
return TOK_valuefieldreference;
}
[a-z][a-zA-Z0-9-]* {
CHECK_DASHES;
asn1p_lval.tv_str = strdup(yytext);
return TOK_identifier;
}
/*
* objectclassreference
*/
[A-Z][A-Z0-9-]* {
CHECK_DASHES;
asn1p_lval.tv_str = strdup(yytext);
return TOK_capitalreference;
}
/*
* typereference, modulereference
* NOTE: TOK_objectclassreference must be combined
* with this token to produce true typereference.
*/
[A-Z][A-Za-z0-9-]* {
CHECK_DASHES;
asn1p_lval.tv_str = strdup(yytext);
return TOK_typereference;
}
"::=" return TOK_PPEQ;
"..." return TOK_ThreeDots;
".." return TOK_TwoDots;
[(){},;:|!.&@\[\]] return yytext[0];
{WSP}+ /* Ignore whitespace */
[^A-Za-z0-9:=,{}<.@()[]'\"|&^*;!-] {
if(TYPE_LIFETIME(1994, 0))
fprintf(stderr, "ERROR: ");
fprintf(stderr,
"Symbol '%c' at line %d is prohibited "
"by ASN.1:1994 and ASN.1:1997\n",
yytext[0], yylineno);
if(TYPE_LIFETIME(1994, 0))
return -1;
}
<with_syntax>{
[^&{} \t\r\v\f\n]+ {
asn1p_lval.tv_opaque.buf = strdup(yytext);
asn1p_lval.tv_opaque.len = yyleng;
return TOK_opaque;
}
{WSP}+ {
asn1p_lval.tv_opaque.buf = strdup(yytext);
asn1p_lval.tv_opaque.len = yyleng;
return TOK_opaque;
}
"}" {
yy_pop_state();
return '}';
}
}
[|^] return yytext[0]; /* Union, Intersection */
<*>. {
fprintf(stderr,
"Unexpected token at line %d: \"%s\"\n",
yylineno, yytext);
while(YYSTATE != INITIAL)
yy_pop_state();
if(0) {
yy_top_state(); /* Just to use this function. */
yy_fatal_error("Parse error");
}
return -1;
}
<*><<EOF>> {
while(YYSTATE != INITIAL)
yy_pop_state();
yyterminate();
}
%%
/*
* Very dirty but wonderful hack allowing to rule states from within .y file.
*/
void asn1p_lexer_hack_push_opaque_state() { yy_push_state(opaque); }
/*
* Another hack which disables recognizing some tokens when inside WITH SYNTAX.
*/
void asn1p_lexer_hack_enable_with_syntax() { yy_push_state(with_syntax); }
/* Yet another */
void asn1p_lexer_hack_push_encoding_control() {
yy_push_state(encoding_control);
}
/*
* Check that a token does not end with dash and does not contain
* several dashes in succession.
* "Name", "Type-Id", "T-y-p-e-i-d" are OK
* "end-", "vustom--value" are INVALID
*/
static int
_check_dashes(char *ptr) {
int prev_dash = 0;
assert(*ptr != '-');
for(;; ptr++) {
switch(*ptr) {
case '-':
if(prev_dash++) /* No double dashes */
return -1;
continue;
case '\0':
if(prev_dash) /* No dashes at the end */
return -1;
break;
default:
prev_dash = 0;
continue;
}
break;
}
return 0;
}
static asn1_integer_t
asn1p_atoi(char *ptr) {
asn1_integer_t value;
errno = 0; /* Clear the error code */
if(sizeof(value) <= sizeof(int)) {
value = strtol(ptr, 0, 10);
} else {
#ifdef HAVE_STRTOIMAX
value = strtoimax(ptr, 0, 10);
#elif HAVE_STRTOLL
value = strtoll(ptr, 0, 10);
#else
value = strtol(ptr, 0, 10);
#endif
}
if(errno == ERANGE) {
fprintf(stderr,
"Value \"%s\" at line %d is too large "
"for this compiler! Please contact the vendor.",
ptr, yylineno);
errno = ERANGE; /* Restore potentially clobbered errno */
}
return value;
}
|