conky/src/hddtemp.c

#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;

	*dev = strdup(buf1);
	if (ret >= 2)
		*addr = strdup(buf2);
	else
		*addr = strdup("127.0.0.1");

	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;
}