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/*
* config.c - blkid.conf routines
*
* Copyright (C) 2009 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/types.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <stdint.h>
#include <stdarg.h>
#include "blkidP.h"
#include "env.h"
static int parse_evaluate(struct blkid_config *conf, char *s)
{
while(s && *s) {
char *sep;
if (conf->nevals >= __BLKID_EVAL_LAST)
goto err;
sep = strchr(s, ',');
if (sep)
*sep = '\0';
if (strcmp(s, "udev") == 0)
conf->eval[conf->nevals] = BLKID_EVAL_UDEV;
else if (strcmp(s, "scan") == 0)
conf->eval[conf->nevals] = BLKID_EVAL_SCAN;
else
goto err;
conf->nevals++;
if (sep)
s = sep + 1;
else
break;
}
return 0;
err:
DBG(CONFIG, ul_debug(
"config file: unknown evaluation method '%s'.", s));
return -1;
}
static int parse_next(FILE *fd, struct blkid_config *conf)
{
char buf[BUFSIZ];
char *s;
/* read the next non-blank non-comment line */
do {
if (fgets (buf, sizeof(buf), fd) == NULL)
return feof(fd) ? 0 : -1;
s = strchr (buf, '\n');
if (!s) {
/* Missing final newline? Otherwise extremely */
/* long line - assume file was corrupted */
if (feof(fd))
s = strchr (buf, '\0');
else {
DBG(CONFIG, ul_debug(
"config file: missing newline at line '%s'.",
buf));
return -1;
}
}
*s = '\0';
if (--s >= buf && *s == '\r')
*s = '\0';
s = buf;
while (*s == ' ' || *s == '\t') /* skip space */
s++;
} while (*s == '\0' || *s == '#');
if (!strncmp(s, "SEND_UEVENT=", 12)) {
s += 12;
if (*s && !strcasecmp(s, "yes"))
conf->uevent = TRUE;
else if (*s)
conf->uevent = FALSE;
} else if (!strncmp(s, "CACHE_FILE=", 11)) {
s += 11;
free(conf->cachefile);
if (*s)
conf->cachefile = strdup(s);
else
conf->cachefile = NULL;
} else if (!strncmp(s, "EVALUATE=", 9)) {
s += 9;
if (*s && parse_evaluate(conf, s) == -1)
return -1;
} else {
DBG(CONFIG, ul_debug(
"config file: unknown option '%s'.", s));
return -1;
}
return 0;
}
/* return real config data or built-in default */
struct blkid_config *blkid_read_config(const char *filename)
{
struct blkid_config *conf;
FILE *f;
if (!filename)
filename = safe_getenv("BLKID_CONF");
if (!filename)
filename = BLKID_CONFIG_FILE;
conf = calloc(1, sizeof(*conf));
if (!conf)
return NULL;
conf->uevent = -1;
DBG(CONFIG, ul_debug("reading config file: %s.", filename));
f = fopen(filename, "r" UL_CLOEXECSTR);
if (!f) {
DBG(CONFIG, ul_debug("%s: does not exist, using built-in default", filename));
goto dflt;
}
while (!feof(f)) {
if (parse_next(f, conf)) {
DBG(CONFIG, ul_debug("%s: parse error", filename));
goto err;
}
}
dflt:
if (!conf->nevals) {
conf->eval[0] = BLKID_EVAL_UDEV;
conf->eval[1] = BLKID_EVAL_SCAN;
conf->nevals = 2;
}
if (!conf->cachefile)
conf->cachefile = strdup(BLKID_CACHE_FILE);
if (conf->uevent == -1)
conf->uevent = TRUE;
if (f)
fclose(f);
return conf;
err:
free(conf);
fclose(f);
return NULL;
}
void blkid_free_config(struct blkid_config *conf)
{
if (!conf)
return;
free(conf->cachefile);
free(conf);
}
#ifdef TEST_PROGRAM
/*
* usage: tst_config [<filename>]
*/
int main(int argc, char *argv[])
{
int i;
struct blkid_config *conf;
char *filename = NULL;
blkid_init_debug(BLKID_DEBUG_ALL);
if (argc == 2)
filename = argv[1];
conf = blkid_read_config(filename);
if (!conf)
return EXIT_FAILURE;
printf("EVALUATE: ");
for (i = 0; i < conf->nevals; i++)
printf("%s ", conf->eval[i] == BLKID_EVAL_UDEV ? "udev" : "scan");
printf("\n");
printf("SEND UEVENT: %s\n", conf->uevent ? "TRUE" : "FALSE");
printf("CACHE_FILE: %s\n", conf->cachefile);
blkid_free_config(conf);
return EXIT_SUCCESS;
}
#endif
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