/*
* Copyright (c) 2005 Stefan Walter
* Copyright (c) 2011 Collabora Ltd.
* Copyright (c) 2013 Red Hat Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
* * Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and
* the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*
* CONTRIBUTORS
* Stef Walter <stefw@redhat.com>
*/
#include "config.h"
#define P11_DEBUG_FLAG P11_DEBUG_CONF
#include "debug.h"
#include "lexer.h"
#include "message.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void
p11_lexer_init (p11_lexer *lexer,
const char *filename,
const char *data,
size_t length)
{
return_if_fail (lexer != NULL);
memset (lexer, 0, sizeof (p11_lexer));
lexer->at = data;
lexer->remaining = length;
return_if_fail (filename != NULL);
lexer->filename = strdup (filename);
return_if_fail (lexer->filename != NULL);
}
static void
clear_state (p11_lexer *lexer)
{
switch (lexer->tok_type) {
case TOK_FIELD:
free (lexer->tok.field.name);
free (lexer->tok.field.value);
break;
case TOK_SECTION:
free (lexer->tok.section.name);
break;
case TOK_PEM:
case TOK_EOF:
break;
}
memset (&lexer->tok, 0, sizeof (lexer->tok));
lexer->tok_type = TOK_EOF;
lexer->complained = false;
}
bool
p11_lexer_next (p11_lexer *lexer,
bool *failed)
{
const char *colon;
const char *value;
const char *line;
const char *end;
const char *pos;
char *part;
return_val_if_fail (lexer != NULL, false);
clear_state (lexer);
if (failed)
*failed = false;
/* Go through lines and process them */
while (lexer->remaining != 0) {
assert (lexer->remaining > 0);
/* Is this line the start of a PEM block? */
if (strncmp (lexer->at, "-----BEGIN ", 11) == 0) {
pos = strnstr (lexer->at, "\n-----END ", lexer->remaining);
if (pos != NULL) {
end = memchr (pos + 1, '\n', lexer->remaining - (pos - lexer->at) - 1);
if (end)
end += 1;
else
end = lexer->at + lexer->remaining;
lexer->tok_type = TOK_PEM;
lexer->tok.pem.begin = lexer->at;
lexer->tok.pem.length = end - lexer->at;
assert (end - lexer->at <= lexer->remaining);
lexer->remaining -= (end - lexer->at);
lexer->at = end;
return true;
}
p11_lexer_msg (lexer, "invalid pem block: no ending line");
if (failed)
*failed = true;
return false;
}
line = lexer->at;
end = memchr (lexer->at, '\n', lexer->remaining);
if (end == NULL) {
end = lexer->at + lexer->remaining;
lexer->remaining = 0;
lexer->at = end;
} else {
assert ((end - lexer->at) + 1 <= lexer->remaining);
lexer->remaining -= (end - lexer->at) + 1;
lexer->at = end + 1;
}
/* Strip whitespace from line */
while (line != end && isspace (line[0]))
++line;
while (line != end && isspace (*(end - 1)))
--end;
/* Empty lines / comments at start */
if (line == end || line[0] == '#')
continue;
/* Is the the a section ? */
if (line[0] == '[') {
if (*(end - 1) != ']') {
part = strndup (line, end - line);
p11_lexer_msg (lexer, "invalid section header: missing braces");
free (part);
if (failed)
*failed = true;
return false;
}
lexer->tok_type = TOK_SECTION;
lexer->tok.section.name = strndup (line + 1, (end - line) - 2);
return_val_if_fail (lexer->tok.section.name != NULL, false);
return true;
}
/* Look for the break between name: value on the same line */
colon = memchr (line, ':', end - line);
if (!colon) {
part = strndup (line, end - line);
p11_lexer_msg (lexer, "invalid field line: no colon");
free (part);
if (failed)
*failed = true;
return false;
}
/* Strip whitespace from name and value */
value = colon + 1;
while (value != end && isspace (value[0]))
++value;
while (line != colon && isspace (*(colon - 1)))
--colon;
lexer->tok_type = TOK_FIELD;
lexer->tok.field.name = strndup (line, colon - line);
lexer->tok.field.value = strndup (value, end - value);
return_val_if_fail (lexer->tok.field.name && lexer->tok.field.value, false);
return true;
}
return false;
}
void
p11_lexer_done (p11_lexer *lexer)
{
return_if_fail (lexer != NULL);
clear_state (lexer);
free (lexer->filename);
memset (lexer, 0, sizeof (p11_lexer));
}
void
p11_lexer_msg (p11_lexer *lexer,
const char *msg)
{
return_if_fail (lexer != NULL);
if (lexer->complained)
return;
switch (lexer->tok_type) {
case TOK_FIELD:
p11_message ("%s: %s: %s", lexer->filename,
lexer->tok.field.name, msg);
break;
case TOK_SECTION:
p11_message ("%s: [%s]: %s", lexer->filename,
lexer->tok.section.name, msg);
break;
case TOK_PEM:
p11_message ("%s: BEGIN ...: %s", lexer->filename, msg);
break;
default:
p11_message ("%s: %s", lexer->filename, msg);
break;
}
lexer->complained = true;
}