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/* Authors: Rob Crittenden <rcritten@redhat.com>
*
* Copyright (C) 2009 Red Hat
* see file 'COPYING' for use and warranty information
*
* This program is free software you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* Simple and INI-style file reader.
*
* usage is:
* char * data = read_config_file("/path/to/something.conf")
* char * entry = get_config_entry(data, "section", "mykey")
*
* caller must free data and entry.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include "config.h"
#include "ipa-client-common.h"
char *
read_config_file(const char *filename)
{
int fd;
struct stat st;
char *data, *dest;
size_t left;
fd = open(filename, O_RDONLY);
if (fd == -1) {
fprintf(stderr, _("cannot open configuration file %s\n"), filename);
return NULL;
}
/* stat() the file so we know the size and can pre-allocate the right
* amount of memory. */
if (fstat(fd, &st) == -1) {
fprintf(stderr, _("cannot stat() configuration file %s\n"), filename);
return NULL;
}
left = st.st_size;
data = malloc(st.st_size + 1);
if (data == NULL) {
fprintf(stderr, _("out of memory\n"));
return NULL;
}
dest = data;
while (left != 0) {
ssize_t res;
res = read(fd, dest, left);
if (res == 0)
break;
if (res < 0) {
fprintf(stderr, _("read error\n"));
close(fd);
free(dest);
return NULL;
}
dest += res;
left -= res;
}
close(fd);
*dest = 0;
return data;
}
char *
get_config_entry(char * in_data, const char *section, const char *key)
{
char *ptr = NULL, *p, *tmp;
char *line;
int in_section = 0;
char * data;
if (NULL == in_data)
return NULL;
else
data = strdup(in_data);
for (line = strtok_r(data, "\n", &ptr); line != NULL;
line = strtok_r(NULL, "\n", &ptr)) {
/* Skip initial whitespace. */
while (isspace((unsigned char)*line) && (*line != '\0'))
line++;
/* If it's a comment, bail. */
if (*line == '#') {
continue;
}
/* If it's the beginning of a section, process it and clear the key
* and value values. */
if (*line == '[') {
line++;
p = strchr(line, ']');
if (p) {
tmp = strndup(line, p - line);
if (in_section) {
/* We exited the matching section without a match */
free(data);
return NULL;
}
if (strcmp(section, tmp) == 0) {
free(tmp);
in_section = 1;
continue;
}
}
} /* [ */
p = strchr(line, '=');
if (p != NULL && in_section) {
/* Trim any trailing whitespace off the key name. */
while (p != line && isspace((unsigned char)p[-1]))
p--;
/* Save the key. */
tmp = strndup(line, p - line);
if (strcmp(key, tmp) != 0) {
free(tmp);
} else {
free(tmp);
/* Skip over any whitespace after the equal sign. */
line = strchr(line, '=');
line++;
while (isspace((unsigned char)*line) && (*line != '\0'))
line++;
/* Trim off any trailing whitespace. */
p = strchr(line, '\0');
while (p != line && isspace((unsigned char)p[-1]))
p--;
/* Save the value. */
tmp = strndup(line, p - line);
free(data);
return tmp;
}
}
}
free(data);
return NULL;
}
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