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libnfc/libnfc/conf.c
xaqq 17ed36a7a5 Drop PCRE dependency. 
The config file is now manually parsed instead of using regex.
While this is less beautifull, it allows us to drop PCRE
as a dependency on Windows.
2015-07-22 15:47:36 +02:00

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/*-
* Free/Libre Near Field Communication (NFC) library
*
* Libnfc historical contributors:
* Copyright (C) 2009 Roel Verdult
* Copyright (C) 2009-2013 Romuald Conty
* Copyright (C) 2010-2012 Romain Tartière
* Copyright (C) 2010-2013 Philippe Teuwen
* Copyright (C) 2012-2013 Ludovic Rousseau
* See AUTHORS file for a more comprehensive list of contributors.
* Additional contributors of this file:
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif // HAVE_CONFIG_H
#include "conf.h"
#ifdef CONFFILES
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <nfc/nfc.h>
#include "nfc-internal.h"
#include "log.h"
#define LOG_CATEGORY "libnfc.config"
#define LOG_GROUP NFC_LOG_GROUP_CONFIG
#ifndef LIBNFC_SYSCONFDIR
// If this define does not already exists, we build it using SYSCONFDIR
#ifndef SYSCONFDIR
#error "SYSCONFDIR is not defined but required."
#endif // SYSCONFDIR
#define LIBNFC_SYSCONFDIR SYSCONFDIR"/nfc"
#endif // LIBNFC_SYSCONFDIR
#define LIBNFC_CONFFILE LIBNFC_SYSCONFDIR"/libnfc.conf"
#define LIBNFC_DEVICECONFDIR LIBNFC_SYSCONFDIR"/devices.d"
static int
escaped_value(const char line[BUFSIZ], int i, char **value)
{
if (line[i] != '"')
goto FAIL;
i++;
if (line[i] == 0 || line[i] == '\n')
goto FAIL;
int c = 0;
while (line[i] && line[i] != '"') {
i++;
c++;
}
if (line[i] != '"')
goto FAIL;
*value = malloc(c + 1);
if (!*value)
goto FAIL;
memset(*value, 0, c + 1);
memcpy(*value, &line[i - c], c);
i++;
while (line[i] && isspace(line[i]))
i++;
if (line[i] != 0 && line[i] != '\n')
goto FAIL;
return 0;
FAIL:
free(*value);
*value = NULL;
return -1;
}
static int
non_escaped_value(const char line[BUFSIZ], int i, char **value)
{
int c = 0;
while (line[i] && !isspace(line[i])) {
i++;
c++;
}
*value = malloc(c + 1);
if (!*value)
goto FAIL;
memset(*value, 0, c + 1);
memcpy(*value, &line[i - c], c);
i++;
while (line[i] && isspace(line[i]))
i++;
if (line[i] != 0)
goto FAIL;
return 0;
FAIL:
free(*value);
*value = NULL;
return -1;
}
static int
parse_line(const char line[BUFSIZ], char **key, char **value)
{
*key = NULL;
*value = NULL;
int i = 0;
int c = 0;
// optional initial spaces
while (isspace(line[i]))
i++;
if (line[i] == 0 || line[i] == '\n')
return -1;
// key
while (isalnum(line[i]) || line[i] == '_' || line[i] == '.') {
i++;
c++;
}
if (c == 0 || line[i] == 0 || line[i] == '\n') // key is empty
return -1;
*key = malloc(c + 1);
if (!*key)
return -1;
memset(*key, 0, c + 1);
memcpy(*key, &line[i - c], c);
// space before '='
while (isspace(line[i]))
i++;
if (line[i] != '=')
return -1;
i++;
if (line[i] == 0 || line[i] == '\n')
return -1;
// space after '='
while (isspace(line[i]))
i++;
if (line[i] == 0 || line[i] == '\n')
return -1;
if (escaped_value(line, i, value) == 0)
return 0;
else if (non_escaped_value(line, i, value) == 0)
return 0;
// Extracting key or value failed
free(*key);
*key = NULL;
free(*value);
*value = NULL;
return -1;
}
static bool
conf_parse_file(const char *filename,
void (*conf_keyvalue)(void *data, const char *key, const char *value),
void *data)
{
FILE *f = fopen(filename, "r");
if (!f) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_INFO, "Unable to open file: %s", filename);
return false;
}
char line[BUFSIZ];
int lineno = 0;
while (fgets(line, BUFSIZ, f) != NULL) {
lineno++;
switch (line[0]) {
case '#':
case '\n':
break;
default: {
char *key;
char *value;
if (parse_line(line, &key, &value) == 0) {
conf_keyvalue(data, key, value);
free(key);
free(value);
} else {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Parse error on line #%d: %s", lineno, line);
}
}
}
}
return false;
}
static void
conf_keyvalue_context(void *data, const char *key, const char *value)
{
nfc_context *context = (nfc_context *)data;
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "key: [%s], value: [%s]", key, value);
if (strcmp(key, "allow_autoscan") == 0) {
string_as_boolean(value, &(context->allow_autoscan));
} else if (strcmp(key, "allow_intrusive_scan") == 0) {
string_as_boolean(value, &(context->allow_intrusive_scan));
} else if (strcmp(key, "log_level") == 0) {
context->log_level = atoi(value);
} else if (strcmp(key, "device.name") == 0) {
if ((context->user_defined_device_count == 0) || strcmp(context->user_defined_devices[context->user_defined_device_count - 1].name, "") != 0) {
if (context->user_defined_device_count >= MAX_USER_DEFINED_DEVICES) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Configuration exceeded maximum user-defined devices.");
return;
}
context->user_defined_device_count++;
}
strncpy(context->user_defined_devices[context->user_defined_device_count - 1].name, value, DEVICE_NAME_LENGTH - 1);
context->user_defined_devices[context->user_defined_device_count - 1].name[DEVICE_NAME_LENGTH - 1] = '\0';
} else if (strcmp(key, "device.connstring") == 0) {
if ((context->user_defined_device_count == 0) || strcmp(context->user_defined_devices[context->user_defined_device_count - 1].connstring, "") != 0) {
if (context->user_defined_device_count >= MAX_USER_DEFINED_DEVICES) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Configuration exceeded maximum user-defined devices.");
return;
}
context->user_defined_device_count++;
}
strncpy(context->user_defined_devices[context->user_defined_device_count - 1].connstring, value, NFC_BUFSIZE_CONNSTRING - 1);
context->user_defined_devices[context->user_defined_device_count - 1].connstring[NFC_BUFSIZE_CONNSTRING - 1] = '\0';
} else if (strcmp(key, "device.optional") == 0) {
if ((context->user_defined_device_count == 0) || context->user_defined_devices[context->user_defined_device_count - 1].optional) {
if (context->user_defined_device_count >= MAX_USER_DEFINED_DEVICES) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Configuration exceeded maximum user-defined devices.");
return;
}
context->user_defined_device_count++;
}
if ((strcmp(value, "true") == 0) || (strcmp(value, "True") == 0) || (strcmp(value, "1") == 0)) //optional
context->user_defined_devices[context->user_defined_device_count - 1].optional = true;
} else {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_INFO, "Unknown key in config line: %s = %s", key, value);
}
}
static void
conf_keyvalue_device(void *data, const char *key, const char *value)
{
char newkey[BUFSIZ];
sprintf(newkey, "device.%s", key);
conf_keyvalue_context(data, newkey, value);
}
static void
conf_devices_load(const char *dirname, nfc_context *context)
{
DIR *d = opendir(dirname);
if (!d) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Unable to open directory: %s", dirname);
} else {
struct dirent *de;
#ifdef WIN32
while ((de = readdir(d)) != NULL) {
#else
struct dirent entry;
struct dirent *result;
while ((readdir_r(d, &entry, &result) == 0) && (result != NULL)) {
de = &entry;
#endif
// FIXME add a way to sort devices
if (de->d_name[0] != '.') {
const size_t filename_len = strlen(de->d_name);
const size_t extension_len = strlen(".conf");
if ((filename_len > extension_len) &&
(strncmp(".conf", de->d_name + (filename_len - extension_len), extension_len) == 0)) {
char filename[BUFSIZ] = LIBNFC_DEVICECONFDIR"/";
strcat(filename, de->d_name);
struct stat s;
if (stat(filename, &s) == -1) {
perror("stat");
continue;
}
if (S_ISREG(s.st_mode)) {
conf_parse_file(filename, conf_keyvalue_device, context);
}
}
}
}
closedir(d);
}
}
void
conf_load(nfc_context *context)
{
conf_parse_file(LIBNFC_CONFFILE, conf_keyvalue_context, context);
conf_devices_load(LIBNFC_DEVICECONFDIR, context);
}
#endif // CONFFILES
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