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/* configparser.c - Read and parse config files
*
* This code is based on the fragments from the eurephia project.
*
* GPLv2 Copyright (C) 2009
* David Sommerseth <davids@redhat.com>
*
* 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; version 2
* of the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/**
* @file configparser.c
* @author David Sommerseth <davids@redhat.com>
* @date 2009-10-01
*
* @brief Config file parser
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <assert.h>
#include <eurephia_nullsafe.h>
#include <eurephia_values.h>
#include <configparser.h>
#include <log.h>
/**
* Parse one single configuration line into a eurephiaVALUES key/value pair. It will also ignore
* comment lines, and also remove the comments on the line of the configuration line so that only
* the key/value information is extracted.
*
* @param line Input configuration line
*
* @return eurephiaVALUES pointer containing the parsed result. On error or if no valid config
* line was found, NULL is returned.
*/
static inline eurephiaVALUES *parse_config_line(LogContext *log, const char *line) {
char *cp = NULL, *key = NULL, *val = NULL, *ptr = NULL;;
eurephiaVALUES *ret = NULL;
if( *line == '#' ) {
return NULL;
}
cp = strdup(line);
key = cp;
val = strpbrk(cp, "=:");
if( val == NULL ) {
free_nullsafe(cp);
return NULL;
}
*val = '\0'; val++;
// Discard comments at the end of a line
if( (ptr = strpbrk(val, "#")) != NULL ) {
*ptr = '\0';
}
// Left trim
while( ((*key == 0x20) || (*key == 0x0A) || (*key == 0x0D)) ) {
key++;
}
while( ((*val == 0x20) || (*val == 0x0A) || (*val == 0x0D)) ) {
val++;
}
// Right trim
ptr = key + strlen_nullsafe(key) - 1;
while( ((*ptr == 0x20) || (*ptr == 0x0A) || (*ptr == 0x0D)) && (ptr > key) ) {
ptr--;
}
ptr++;
*ptr = '\0';
ptr = val + strlen_nullsafe(val) - 1;
while( ((*ptr == 0x20) || (*ptr == 0x0A) || (*ptr == 0x0D)) && (ptr > val) ) {
ptr--;
}
ptr++;
*ptr = '\0';
// Put key/value into a eurephiaVALUES struct and return it
ret = eCreate_value_space(log, 20);
ret->key = strdup(key);
ret->val = strdup(val);
free_nullsafe(cp);
return ret;
}
static inline eurephiaVALUES *default_cfg_values(LogContext *log, eurephiaVALUES *prgargs) {
eurephiaVALUES *cfg = NULL, *ptr = NULL;
cfg = eCreate_value_space(log, 20);
eAdd_value(cfg, "datadir", "/var/lib/rteval");
eAdd_value(cfg, "xsltpath", "/usr/share/rteval");
eAdd_value(cfg, "db_server", "localhost");
eAdd_value(cfg, "db_port", "5432");
eAdd_value(cfg, "database", "rteval");
eAdd_value(cfg, "db_username", "rtevparser");
eAdd_value(cfg, "db_password", "rtevaldb_parser");
eAdd_value(cfg, "reportdir", "/var/lib/rteval/reports");
eAdd_value(cfg, "max_report_size", "2097152"); // 2MB
// Copy over the arguments to the config, update existing settings
for( ptr = prgargs; ptr; ptr = ptr->next ) {
eUpdate_value(cfg, ptr->key, ptr->val, 1);
}
return cfg;
}
/**
* Parses a section of a config file and puts it into an eurephiaVALUES key/value stack
*
* @param log Initialised log context
* @param prgargs Parsed command line arguments (see parse_arguments())
* @param section Section to read from the config file
*
* @return Returns a pointer to an eurephiaVALUES stack containing the configuration on success,
* otherwise NULL.
*/
eurephiaVALUES *read_config(LogContext *log, eurephiaVALUES *prgargs, const char *section) {
FILE *fp = NULL;
char *buf = NULL, *sectmatch = NULL, *cfgname = NULL;
int sectfound = 0;
eurephiaVALUES *cfg = NULL;
struct stat fi;
cfgname = eGet_value(prgargs, "configfile");
if( stat(cfgname, &fi) == -1 ) {
writelog(log, LOG_EMERG, "Could not open the config file: %s", cfgname);
return NULL;
}
if( (fp = fopen(cfgname, "r")) == NULL ) {
writelog(log, LOG_EMERG, "Could not open the config file: %s", cfgname);
return NULL;
}
buf = (char *) malloc_nullsafe(log, fi.st_size+2);
sectmatch = (char *) malloc_nullsafe(log, strlen_nullsafe(section)+4);
sprintf(sectmatch, "[%s]", section);
cfg = default_cfg_values(log, prgargs);
writelog(log, LOG_DEBUG, "Reading config file: %s", cfgname);
while( fgets(buf, fi.st_size, fp) != NULL ) {
if( strncmp(buf, "[", 1) == 0 ) {
sectfound = (!sectfound && (strncmp(buf, sectmatch, strlen(sectmatch)) == 0));
continue;
}
if( sectfound ) {
eurephiaVALUES *prm = parse_config_line(log, buf);
if( prm != NULL ) {
cfg = eUpdate_valuestruct(cfg, prm, 1);
}
}
};
free_nullsafe(buf);
free_nullsafe(sectmatch);
fclose(fp); fp = NULL;
return cfg;
}
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