1 /* apcupsd.c: conky module for APC UPS daemon monitoring
3 * Copyright (C) 2009 Jaromir Smrcek <jaromir.smrcek@zoner.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
25 #include <netinet/in.h>
31 // encapsulated recv()
33 static int net_recv_ex(int sock, void *buf, int size, struct timeval *tv)
39 // wait for some data to be read
44 res = select(sock + 1, &fds, NULL, NULL, tv);
45 } while (res < 0 && errno == EINTR);
46 if (res < 0) return 0;
49 errno = ETIMEDOUT; // select was succesfull, errno is now 0
53 // socket ready, read the data
56 res = recv(sock, (char*)buf, size, 0);
57 } while (res < 0 && errno == EINTR);
58 if (res < 0) return 0;
69 // read whole buffer or fail
71 static int net_recv(int sock, void* buf, int size) {
76 struct timeval tv = { 0, 250000 };
79 len = net_recv_ex(sock, (char*)buf + off, todo, &tv);
88 // get one response line
90 static int get_line(int sock, char line[], short linesize) {
92 // get the line length
94 if (!net_recv(sock, &sz, sizeof(sz))) return -1;
99 while (sz > linesize) {
100 // this is just a hack (being lazy), this should not happen anyway
101 net_recv(sock, line, linesize);
104 if (!net_recv(sock, line, sz)) return 0;
109 #define FILL(NAME,FIELD,FIRST) \
110 if (!strncmp(NAME, line, sizeof(NAME)-1)) { \
111 strncpy(apc->items[FIELD], line+11, APCUPSD_MAXSTR); \
112 /* remove trailing newline and assure termination */ \
113 apc->items[FIELD][len-11 > APCUPSD_MAXSTR ? APCUPSD_MAXSTR : len-12] = 0; \
116 for (c = apc->items[FIELD]; *c; ++c) \
117 if (*c == ' ' && c > apc->items[FIELD]+2) { \
125 // fills in the data received from a socket
127 static int fill_items(int sock, PAPCUPSD_S apc) {
131 while ((len = get_line(sock, line, sizeof(line)))) {
132 // fill the right types in
133 FILL("UPSNAME", APCUPSD_NAME, FALSE);
134 FILL("MODEL", APCUPSD_MODEL, FALSE);
135 FILL("UPSMODE", APCUPSD_UPSMODE, FALSE);
136 FILL("CABLE", APCUPSD_CABLE, FALSE);
137 FILL("STATUS", APCUPSD_STATUS, FALSE);
138 FILL("LINEV", APCUPSD_LINEV, TRUE);
139 FILL("LOADPCT", APCUPSD_LOAD, TRUE);
140 FILL("BCHARGE", APCUPSD_CHARGE, TRUE);
141 FILL("TIMELEFT", APCUPSD_TIMELEFT, TRUE);
142 FILL("ITEMP", APCUPSD_TEMP, TRUE);
143 FILL("LASTXFER", APCUPSD_LASTXFER, FALSE);
150 // Conky update function for apcupsd data
152 void update_apcupsd(void) {
158 for (i = 0; i < _APCUPSD_COUNT; ++i)
159 memcpy(apc.items[i], "N/A", 4); // including \0
162 struct hostent* he = 0;
163 struct sockaddr_in addr;
165 #ifdef HAVE_GETHOSTBYNAME_R
166 struct hostent he_mem;
171 // connect to apcupsd daemon
173 sock = socket(AF_INET, SOCK_STREAM, 0);
178 #ifdef HAVE_GETHOSTBYNAME_R
179 if (gethostbyname_r(info.apcupsd.host, &he_mem, hostbuff, sizeof(hostbuff), &he, &he_errno)) {
180 ERR("APCUPSD gethostbyname_r: %s", hstrerror(h_errno));
183 #else /* HAVE_GETHOSTBYNAME_R */
184 he = gethostbyname(info.apcupsd.host);
186 herror("gethostbyname");
189 #endif /* HAVE_GETHOSTBYNAME_R */
191 memset(&addr, 0, sizeof(addr));
192 addr.sin_family = AF_INET;
193 addr.sin_port = info.apcupsd.port;
194 memcpy(&addr.sin_addr, he->h_addr, he->h_length);
195 if (connect(sock, (struct sockaddr*)&addr, sizeof(struct sockaddr)) < 0) {
196 // no error reporting, the daemon is probably not running
201 // send status request - "status" - 6B
204 // no waiting to become writeable is really needed
205 if (send(sock, &sz, sizeof(sz), 0) != sizeof(sz) || send(sock, "status", 6, 0) != 6) {
211 // read the lines of output and put them into the info structure
213 if (!fill_items(sock, &apc)) break;
220 // "atomically" copy the data into working set
222 memcpy(info.apcupsd.items, apc.items, sizeof(info.apcupsd.items));
227 // fills in the N/A strings and default host:port
229 void init_apcupsd(void) {
232 for (i = 0; i < _APCUPSD_COUNT; ++i)
233 memcpy(info.apcupsd.items[i], "N/A", 4); // including \0
234 memcpy(info.apcupsd.host, "localhost", 10);
235 info.apcupsd.port = htons(3551);