/* 
 * ftphelper
 *
 * Copyright (C) 2012 Jonathan McCrohan
 *
 * 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/>.
 */

// gcc ftphelper.c -o ftphelper `pkg-config --libs --cflags libconfig`

#ifndef VERSION_STRING
#define VERSION_STRING "[undefined version]"
#endif

#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <string.h>
#include <libconfig.h>

char *mac_address() {
	int s;
	struct ifreq ifr;

	s = socket(PF_INET, SOCK_DGRAM, 0);
	memset(&ifr, 0x00, sizeof(ifr));
	strcpy(ifr.ifr_name, "eth0");
	ioctl(s, SIOCGIFHWADDR, &ifr);
	close(s);

	static char mac_address[12];
	sprintf(mac_address, "%.2X%.2X%.2X%.2X%.2X%.2X",
			(unsigned char) ifr.ifr_hwaddr.sa_data[0],
			(unsigned char) ifr.ifr_hwaddr.sa_data[1],
			(unsigned char) ifr.ifr_hwaddr.sa_data[2],
			(unsigned char) ifr.ifr_hwaddr.sa_data[3],
			(unsigned char) ifr.ifr_hwaddr.sa_data[4],
			(unsigned char) ifr.ifr_hwaddr.sa_data[5]);

	return mac_address;
}

int main(int argc, char *argv[]) {

	if (argc == 1) {
		return 0;
	}

	if (strcmp(argv[1], "--mac") == 0) {
		printf("%s", mac_address());
		return 0;
	}

	const char *configfile = "/etc/ftpupload.cfg";
	config_t cfg;
	const char *ftp_server;
	const char *ftp_username;
	const char *ftp_password;
	const char *ftp_directory;

	config_init(&cfg);

	if (!config_read_file(&cfg, configfile)) {
		fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
				config_error_line(&cfg), config_error_text(&cfg));
		config_destroy(&cfg);
		fprintf(stderr, "Unable to find configfile.\n");
		return 1;
	}

	if (!(config_lookup_string(&cfg, "ftp.server", &ftp_server)
			&& config_lookup_string(&cfg, "ftp.username", &ftp_username)
			&& config_lookup_string(&cfg, "ftp.password", &ftp_password)
			&& config_lookup_string(&cfg, "ftp.directory", &ftp_directory))) {
		fprintf(stderr,
				"Incomplete ftp configuration. Check configuration file.\n");
		return 1;
	}

	if (strcmp(argv[1], "--server") == 0) {
		printf("%s", ftp_server);
		return 0;
	}
	if (strcmp(argv[1], "--username") == 0) {
		printf("%s", ftp_username);
		return 0;
	}
	if (strcmp(argv[1], "--password") == 0) {
		printf("%s", ftp_password);
		return 0;
	}
	if (strcmp(argv[1], "--directory") == 0) {
		printf("%s", ftp_directory);
		return 0;
	}
	if (strcmp(argv[1], "--version") == 0) {
		printf("%s", VERSION_STRING);
		return 0;
	}
}