/* Conky, a system monitor, based on torsmo
 *
 * Any original torsmo code is licensed under the BSD license
 *
 * All code written since the fork of torsmo is licensed under the GPL
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
 * Copyright (c) 2005-2008 Brenden Matthews, Philip Kovacs, et. al.
 *	(see AUTHORS)
 * All rights reserved.
 *
 * 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/>.
 *
 * $Id$ */

#include "conky.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define BUFLEN 512
#define PORT 7634

char buf[BUFLEN];

int scan_hddtemp(const char *arg, char **dev, char **addr, int *port)
{
	char buf1[32], buf2[64];
	int n, ret;

	ret = sscanf(arg, "%31s %63s %d", buf1, buf2, &n);

	if (ret < 1) {
		return -1;
	}

	if (strncmp(buf1, "/dev/", 5)) {
		strncpy(buf1 + 5, buf1, 32 - 5);
		strncpy(buf1, "/dev/", 5);
	}
	*dev = strndup(buf1, text_buffer_size);

	if (ret >= 2) {
		*addr = strndup(buf2, text_buffer_size);
	} else {
		*addr = strndup("127.0.0.1", text_buffer_size);
	}

	if (ret == 3) {
		*port = n;
	} else {
		*port = PORT;
	}

	return 0;
}

char *get_hddtemp_info(char *dev, char *hostaddr, int port, char *unit)
{
	int sockfd = 0;
	struct hostent *he;
	struct sockaddr_in addr;
	struct timeval tv;
	fd_set rfds;
	int len, i, devlen = strlen(dev);
	char sep;
	char *p, *out, *r = NULL;

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		return NULL;
	}

	he = gethostbyname(hostaddr);
	if (!he) {
		perror("gethostbyname");
		goto out;
	}

	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr = *((struct in_addr *) he->h_addr);
	memset(&(addr.sin_zero), 0, 8);

	if (connect(sockfd, (struct sockaddr *) &addr,
			sizeof(struct sockaddr)) == -1) {
		perror("connect");
		goto out;
	}

	FD_ZERO(&rfds);
	FD_SET(sockfd, &rfds);

	/* We're going to wait up to a quarter a second to see whether there's
	 * any data available. Polling with timeout set to 0 doesn't seem to work
	 * with hddtemp. */
	tv.tv_sec = 0;
	tv.tv_usec = 250000;

	i = select(sockfd + 1, &rfds, NULL, NULL, &tv);
	if (i == -1) {
		if (errno == EINTR) {	/* silently ignore interrupted system call */
			goto out;
		} else {
			perror("select");
		}
	}

	/* No data available */
	if (i <= 0) {
		goto out;
	}

	p = buf;
	len = 0;
	do {
		i = recv(sockfd, p, BUFLEN - (p - buf), 0);
		if (i < 0) {
			perror("recv");
			goto out;
		}
		len += i;
		p += i;
	} while (i > 0 && p < buf + BUFLEN - 1);

	if (len < 2) {
		goto out;
	}

	buf[len] = 0;

	/* The first character read is the separator. */
	sep = buf[0];
	p = buf + 1;

	while (*p) {
		if (!strncmp(p, dev, devlen)) {
			p += devlen + 1;
			p = strchr(p, sep);
			if (!p) {
				goto out;
			}
			p++;
			out = p;
			p = strchr(p, sep);
			if (!p) {
				goto out;
			}
			*p = '\0';
			p++;
			*unit = *p;
			if (!strncmp(out, "NA", 2)) {
				strcpy(buf, "N/A");
				r = buf;
			} else {
				r = out;
			}
			goto out;
		} else {
			for (i = 0; i < 5; i++) {
				p = strchr(p, sep);
				if (!p) {
					goto out;
				}
				p++;
			}
		}
	}
out:
	close(sockfd);
	return r;
}