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/*
* configfile.c
*
* Methods for accessing the PPTPD config file and searching for
* PPTPD keywords.
*
* $Id: configfile.c,v 1.2 2004/04/22 10:48:16 quozl Exp $
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "defaults.h"
#include "configfile.h"
#include "our_syslog.h"
/* Local function prototypes */
static FILE *open_config_file(char *filename);
static void close_config_file(FILE * file);
/*
* read_config_file
*
* This method opens up the file specified by 'filename' and searches
* through the file for 'keyword'. If 'keyword' is found any string
* following it is stored in 'value'.
*
* args: filename (IN) - config filename
* keyword (IN) - word to search for in config file
* value (OUT) - value of keyword
*
* retn: -1 on error, 0 if keyword not found, 1 on value success
*/
int read_config_file(char *filename, char *keyword, char *value)
{
FILE *in;
int len = 0, keyword_len = 0;
int foundit = 0;
char *buff_ptr;
char buffer[MAX_CONFIG_STRING_SIZE];
*value = '\0';
buff_ptr = buffer;
keyword_len = strlen(keyword);
in = open_config_file(filename);
if (in == NULL) {
/* Couldn't find config file, or permission denied */
return -1;
}
while ((fgets(buffer, MAX_CONFIG_STRING_SIZE - 1, in)) != NULL) {
/* ignore long lines */
if (buffer[(len = strlen(buffer)) - 1] != '\n') {
syslog(LOG_ERR, "Long config file line ignored.");
do
if (!fgets(buffer, MAX_CONFIG_STRING_SIZE - 1, in)) break;
while (buffer[strlen(buffer) - 1] != '\n');
continue;
}
len--; /* For the NL at the end */
while (--len >= 0)
if (buffer[len] != ' ' && buffer[len] != '\t')
break;
len++;
buffer[len] = '\0';
buff_ptr = buffer;
/* Short-circuit blank lines and comments */
if (!len || *buff_ptr == '#')
continue;
/* Non-blank lines starting with a space are an error */
if (*buff_ptr == ' ' || *buff_ptr == '\t') {
syslog(LOG_ERR, "Config file line starts with a space: %s", buff_ptr);
continue;
}
/* At this point we have a line trimmed for trailing spaces. */
/* Now we need to check if the keyword matches, and if so */
/* then get the value (if any). */
/* Check if it's the right keyword */
do {
if (*buff_ptr == ' ' || *buff_ptr == '\t')
break;
} while (*++buff_ptr);
len = buff_ptr - buffer;
if (len == keyword_len && !strncmp(buffer, keyword, len)) {
foundit++;
break;
}
}
close_config_file(in);
if (foundit) {
/* Right keyword, now get the value (if any) */
do {
if (*buff_ptr != ' ' && *buff_ptr != '\t')
break;
} while (*++buff_ptr);
strcpy(value, buff_ptr);
return 1;
} else {
/* didn't find it - better luck next time */
return 0;
}
}
/*
* open_config_file
*
* Opens up the PPTPD config file for reading.
*
* args: filename - the config filename (eg. '/etc/pptpd.conf')
*
* retn: NULL on error, file descriptor on success
*
*/
static FILE *open_config_file(char *filename)
{
FILE *in;
static int first = 1;
if ((in = fopen(filename, "r")) == NULL) {
/* Couldn't open config file */
if (first) {
perror(filename);
first = 0;
}
return NULL;
}
return in;
}
/*
* close_config_file
*
* Closes the PPTPD config file descriptor
*
*/
static void close_config_file(FILE * in)
{
fclose(in);
}
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