summaryrefslogtreecommitdiff
path: root/common/lexer.c
blob: 329881f045178563ee11a672385ddce09aeebbae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
/*
 * 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);
	*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;
}