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-rw-r--r--plugin_hddtemp.c312
1 files changed, 312 insertions, 0 deletions
diff --git a/plugin_hddtemp.c b/plugin_hddtemp.c
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+/* $Id$
+ * $URL$
+ *
+ * plugin hddtemp
+ *
+ * Copyright (C) 2007 Scott Bronson <brons_lcd4linux@rinspin.com>
+ * Copyright (C) 2004, 2005, 2006, 2007, 2008 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux 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.
+ *
+ * LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/* Example:
+ * (I tried to put this info on the wiki but Akismet claimed it was spam)
+
+ Widget SmallHDDTemp {
+ class 'Text'
+ expression hddtemp('/dev/hda')
+ width 4
+ precision 1
+ align 'R'
+ update tick
+ }
+
+ hddtemp home page: http://www.guzu.net/linux/hddtemp.php
+
+ Quick Examples:
+ * hddtemp() -- return temperature of first drive (order is defined by the hddtemp daemon).
+ * hddtemp('/dev/hda') -- return temperature of /dev/hda on localhost.
+ * hddtemp('ST3400832A') -- return temperature of the drive with the given ID.
+ * hddtemp('burly', '') -- return temperature of the first drive on host burly.
+ * hddtemp('burly', 17634, '/dev/hda') -- return temperature of /dev/hda on burly connecting to the hddtemp daemon listening on port 17634.
+
+You can find out what drives are being monitored by running
+ telnet HOST PORT
+
+i.e.
+
+ $ telnet localhost 7634
+ Trying 127.0.0.1...
+ Connected to localhost.
+ Escape character is '^]'.
+ |/dev/hda|ST3400832A|53|C|Connection closed by foreign host.
+
+This tells me that /dev/hda is a Seagate ST3400832A running at an awfully
+toasty 53 degC.
+
+ */
+
+
+/*
+ * exported functions:
+ *
+ * int plugin_init_hddtemp (void)
+ * adds various functions
+ * void plugin_exit_hddtemp (void)
+ *
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+/* network specific includes */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+
+/* these should always be included */
+#include "debug.h"
+#include "plugin.h"
+#include "cfg.h"
+#include "thread.h"
+
+
+static int socket_open(const char *name, int port)
+{
+ struct sockaddr_in server;
+ struct hostent *host_info;
+ unsigned long addr;
+ int sock;
+
+ sock = socket(PF_INET, SOCK_STREAM, 0);
+ if (sock < 0) {
+ error("[hddtemp] failed to create socket: %s", strerror(errno));
+ return -1;
+ }
+
+ memset(&server, 0, sizeof(server));
+ if ((addr = inet_addr(name)) != INADDR_NONE) {
+ memcpy((char *) &server.sin_addr, &addr, sizeof(addr));
+ } else {
+ host_info = gethostbyname(name);
+ if (NULL == host_info) {
+ error("[hddtemp] Unknown server: %s", name);
+ return -1;
+ }
+ memcpy((char *) &server.sin_addr, host_info->h_addr, host_info->h_length);
+ }
+
+ server.sin_family = AF_INET;
+ server.sin_port = htons(port);
+
+ if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
+ error("[hddtemp] can't connect to server %s: %s", name, strerror(errno));
+ return -1;
+ }
+
+ return sock;
+}
+
+
+// replaces all null chars in a buffer with a given character.
+static void replace_nulls(char *buf, size_t len, char repl)
+{
+ char *end = buf + len;
+
+ while (buf < end) {
+ if (*buf == '\0') {
+ *buf = repl;
+ }
+
+ buf += 1;
+ }
+}
+
+
+static size_t hddtemp_read(int socket, char *buf, size_t bufsiz)
+{
+ size_t count = 0;
+ ssize_t len;
+
+ while (count < bufsiz) {
+ len = read(socket, buf + count, bufsiz - count);
+ if (len > 0) {
+ replace_nulls(buf + count, len, '@');
+ count += len;
+ } else if (len < 0) {
+ // an error!
+ error("[hddtemp] Couldn't read: %s", strerror(errno));
+ return -1;
+ } else {
+ // remote socket has closed
+ break;
+ }
+ }
+
+ // null-terminate the string
+ if (count < bufsiz) {
+ buf[count] = '\0';
+ } else {
+ buf[bufsiz - 1] = '\0';
+ }
+
+ return count;
+}
+
+
+static int hddtemp_connect(const char *host, int port, char *buf, size_t bufsiz)
+{
+ int sock, ret;
+
+ sock = socket_open(host, port);
+ if (sock < 0) {
+ error("[hddtemp] Error accessing %s:%d: %s", host, port, strerror(errno));
+ return -1;
+ }
+
+ ret = hddtemp_read(sock, buf, bufsiz);
+ close(sock);
+
+ return ret;
+}
+
+
+static char *hddtemp_fetch(char *buf, size_t bufsiz, const char *host, int port, const char *arg)
+{
+ char *line, *end;
+
+ // fetch a buffer of all hddtemps
+ if (!hddtemp_connect(host, port, buf, bufsiz)) {
+ return "err";
+ }
+ // find the line containing the user's specification
+ line = strstr(buf, arg);
+ if (!line) {
+ return "--";
+ }
+ // back up to the beginning of the line
+ while (line > buf && line[-1] != '\n') {
+ line--;
+ }
+
+ // quick sanity check -- each line begins with the separator
+ if (*line != '|') {
+ return "fmt1";
+ }
+ // |device|identifier|temp|units|
+ // skip 3 bars to find the start of the temperature
+ line = strchr(line + 1, '|');
+ if (line && line[0])
+ line = strchr(line + 1, '|');
+ if (!line || !line[0]) {
+ return "fmt2";
+ }
+ // set the next bar to '\0' to null-terminate temp
+ line += 1;
+ end = strchr(line, '|');
+ if (!end) {
+ return "fmt3";
+ }
+ *end = '\0';
+
+ return line;
+}
+
+
+#ifndef TEST
+
+static void hddtemp_call(RESULT * result, int argc, RESULT * argv[])
+{
+ char buf[4096];
+ const char *search = "";
+ const char *host = "localhost";
+ int port = 7634;
+ char *out;
+
+ switch (argc) {
+ case 0:
+ break;
+ case 1:
+ search = R2S(argv[0]);
+ break;
+ case 2:
+ host = R2S(argv[0]);
+ search = R2S(argv[1]);
+ default:
+ if (argv > 3) {
+ error("hddtemp(): too many parameters");
+ }
+ host = R2S(argv[0]);
+ port = (int) R2N(argv[1]);
+ search = R2S(argv[2]);
+ }
+
+ out = hddtemp_fetch(buf, sizeof(buf), host, port, search);
+ SetResult(&result, R_STRING, out);
+}
+
+
+int plugin_init_hddtemp(void)
+{
+ info("Adding hddtemp functions!");
+
+ AddFunction("hddtemp", -1, hddtemp_call);
+
+ return 0;
+}
+
+
+void plugin_exit_hddtemp(void)
+{
+}
+#endif
+
+
+
+#ifdef TEST
+// Add this to your makefile to make the test_hddtemp app:
+// test_hddtemp: plugin_hddtemp.c
+// gcc -Wall -Werror -g -DTEST plugin_hddtemp.c -o $@
+
+#include <stdarg.h>
+
+void message(const int level, const char *format, ...)
+{
+ va_list ap;
+
+ va_start(ap, format);
+ vprintf(format, ap);
+ putchar('\n');
+ va_end(ap);
+}
+
+int main(int argc, char **argv)
+{
+ char buf[4096];
+ char *out = hddtemp_fetch(buf, sizeof(buf), argv[1] ? argv[1] : "/dev/hda");
+ printf("OUTPUT: %s\n", out);
+ return 0;
+}
+#endif
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