bmsd/rdconfig.c

/*****************************************************************************
 * Copyright (C) 2017-2018
 *   
 * Michiel Broek <mbroek at mbse dot eu>
 *
 * This file is part of the bms (Brewery Management System)
 *
 * This 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 2, or (at your option) any
 * later version.
 *
 * bms 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 ThermFerm; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *****************************************************************************/

#include "bms.h"
#include "xutil.h"
#include "futil.h"
#include "rdconfig.h"


static char	*mypath;
static char	*k, *v;
static int	linecnt = 0;

extern int	debug;
extern char	*Private_Path;


sys_config	Config;


static int getstr(char **);
static int getint(char **);


key_list keytab[] = {
    {(char *)"bms_name",		getstr,		(char **)&Config.bms_name},
    {(char *)"bms_uuid",		getstr,		(char **)&Config.bms_uuid},
    {(char *)"mysql_host",		getstr,		(char **)&Config.mysql_host},
    {(char *)"mysql_port",		getint,		(char **)&Config.mysql_port},
    {(char *)"mysql_user",		getstr,		(char **)&Config.mysql_user},
    {(char *)"mysql_pass",		getstr,		(char **)&Config.mysql_pass},
    {(char *)"mysql_database",		getstr,		(char **)&Config.mysql_database},
    {(char *)"mqtt_host",		getstr,		(char **)&Config.mqtt_host},
    {(char *)"mqtt_port",		getint,		(char **)&Config.mqtt_port},
    {(char *)"mqtt_user",		getstr,		(char **)&Config.mqtt_user},
    {(char *)"mqtt_pass",		getstr,		(char **)&Config.mqtt_pass},
    {NULL,				NULL,		NULL}
};


/*
 * Kill configuration data
 */
void killconfig(void)
{
    if (Config.bms_name)
	free(Config.bms_name);
    Config.bms_name = NULL;
    if (Config.bms_uuid)
	free(Config.bms_uuid);
    Config.bms_uuid = NULL;

    if (Config.mysql_host)
	free(Config.mysql_host);
    Config.mysql_host = NULL;
    Config.mysql_port = 3306;
    if (Config.mysql_user)
	free(Config.mysql_user);
    Config.mysql_user = NULL;
    if (Config.mysql_pass)
	free(Config.mysql_pass);
    Config.mysql_pass = NULL;
    if (Config.mysql_database)
	free(Config.mysql_database);
    Config.mysql_database = NULL;

    if (Config.mqtt_host)
	free(Config.mqtt_host);
    Config.mqtt_host = NULL;
    Config.mqtt_port = 1883;
    if (Config.mqtt_user)
	free(Config.mqtt_user);
    Config.mqtt_user = NULL;
    if (Config.mqtt_pass)
	free(Config.mqtt_pass);
    Config.mqtt_pass = NULL;
}


int wrconfig(void)
{
    FILE	*fp;

    if (mypath)
	free(mypath);
    mypath = xstrcpy(Private_Path);
    mypath = xstrcat(mypath, (char *)"/bms.config");
    if (mkdirs(mypath, 0755) == FALSE)
	return 1;

    if ((fp = fopen(mypath, "w")) == NULL) {
	syslog(LOG_NOTICE, "[rdconfig] could not rewrite %s", mypath);
	return 1;
    }

    fprintf(fp, "# Configuration file for BMS %s\n", VERSION);
    fprintf(fp, "#\n");
    if (Config.bms_name)
	fprintf(fp, "bms_name              %s\n", Config.bms_name);
    if (Config.bms_uuid)
	fprintf(fp, "bms_uuid              %s\n", Config.bms_uuid);
    fprintf(fp, "#\n");

    if (Config.mysql_host)
	fprintf(fp, "mysql_host            %s\n", Config.mysql_host);
    fprintf(fp, "mysql_port            %d\n", Config.mysql_port);
    if (Config.mysql_user)
	fprintf(fp, "mysql_user            %s\n", Config.mysql_user);
    else
	fprintf(fp, "#mysql_user            <username>\n");
    if (Config.mysql_pass)
	fprintf(fp, "mysql_pass             %s\n", Config.mysql_pass);
    else
    	fprintf(fp, "#mysql_pass             <passwd>\n");
    if (Config.mysql_database)
	fprintf(fp, "mysql_database        %s\n", Config.mysql_database);
    else
	fprintf(fp, "#mysql_database        <dbname>\n");
    fprintf(fp, "#\n");

    if (Config.mqtt_host)
	fprintf(fp, "mqtt_host             %s\n", Config.mqtt_host);
    fprintf(fp, "mqtt_port             %d\n", Config.mqtt_port);
    if (Config.mqtt_user)
	fprintf(fp, "mqtt_user             %s\n", Config.mqtt_user);
    else
	fprintf(fp, "#mqtt_user             <username>\n");
    if (Config.mqtt_pass)
	fprintf(fp, "mqtt_pass             %s\n", Config.mqtt_pass);
    else
	fprintf(fp, "#mqtt_pwd              <passwd>\n");

    fprintf(fp, "#\n");
    fprintf(fp, "# End of generated configuration\n");
    fclose(fp);
    free(mypath);
    mypath = NULL;
    return 0;
}


int rdconfig(void)
{
    FILE    	*fp;
    uuid_t	uu;
    char	buf[256], *p;
    int		i, rc = 0;

    if (mypath)
	free(mypath);
    mypath = xstrcpy(Private_Path);
    mypath = xstrcat(mypath, (char *)"/bms.config");

    killconfig();

    if (debug)
	fprintf(stdout, "[rdconfig] reading %s\n", mypath);

    if ((fp = fopen(mypath, "r")) == NULL) {
	syslog(LOG_NOTICE, "[rdconfig] cannot open %s", mypath);
	Config.bms_name = xstrcpy((char *)"My Brewery");
	Config.bms_uuid = malloc(37);
	uuid_generate(uu);
	uuid_unparse(uu, Config.bms_uuid);
	Config.mysql_port = 3306;
	Config.mysql_host = xstrcpy((char *)"localhost");
	Config.mqtt_port = 1883;
	Config.mqtt_host = xstrcpy((char *)"localhost");
	return wrconfig();
    }

    linecnt = 0;
    while (fgets(buf, sizeof(buf) -1, fp)) {
	linecnt++;
	if (*(p = buf + strlen(buf) -1) != '\n') {
	    syslog(LOG_NOTICE, "[rdconfig] %s(%d): \"%s\" - line too long", mypath, linecnt, buf);
	    rc = 1;
	    break;
	}
	*p-- = '\0';
	while ((p >= buf) && isspace(*p))
	    *p-- = '\0';
	k = buf;
	while (*k && isspace(*k))
	    k++;
	p = k;
	while (*p && !isspace(*p))
	    p++;
	*p++='\0';
	v = p;
	while (*v && isspace(*v)) 
	    v++;

	if ((*k == '\0') || (*k == '#')) {
	    continue;
	}

	for (i = 0; keytab[i].key; i++)
	    if (strcasecmp(k,keytab[i].key) == 0)
		break;

	if (keytab[i].key == NULL) {
	    syslog(LOG_NOTICE, "[rdconfig] %s(%d): %s %s - unknown keyword", mypath, linecnt, S(k), S(v));
	    rc = 1;
	    break;
	} else if ((keytab[i].prc(keytab[i].dest))) {
	    rc = 1;
	    break;
	}
    }
    fclose(fp);

    free(mypath);
    mypath = NULL;

    return rc;
}


static int getstr(char **dest)
{
    if (debug)
    	fprintf(stdout, "[rdconfig] getstr: %s(%d): %s %s\n", mypath, linecnt, S(k), S(v));

    *dest = xstrcpy(v);
    return 0;
}


static int getint(char **dest)
{
    if (debug)
    	fprintf(stdout, "[rdconfig] getint: %s(%d): %s %s\n", mypath, linecnt, k, v);

    if (strspn(v,"0123456789") != strlen(v)) 
        syslog(LOG_NOTICE, "[rdconfig] %s(%d): %s %s - bad numeric", mypath, linecnt, S(k), S(v));
    else 
        *((int*)dest)=atoi(v);
    return 0;
}