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
29 // encapsulated recv()
31 static int net_recv_ex(int sock, void *buf, int size, struct timeval *tv)
37 // wait for some data to be read
42 res = select(sock + 1, &fds, NULL, NULL, tv);
43 } while (res < 0 && errno == EINTR);
44 if (res < 0) return 0;
47 errno = ETIMEDOUT; // select was succesfull, errno is now 0
51 // socket ready, read the data
54 res = recv(sock, (char*)buf, size, 0);
55 } while (res < 0 && errno == EINTR);
56 if (res < 0) return 0;
67 // read whole buffer or fail
69 static int net_recv(int sock, void* buf, int size) {
74 struct timeval tv = { 0, 250000 };
77 len = net_recv_ex(sock, (char*)buf + off, todo, &tv);
86 // get one response line
88 static int get_line(int sock, char line[], short linesize) {
90 // get the line length
92 if (!net_recv(sock, &sz, sizeof(sz))) return -1;
97 while (sz > linesize) {
98 // this is just a hack (being lazy), this should not happen anyway
99 net_recv(sock, line, linesize);
102 if (!net_recv(sock, line, sz)) return 0;
107 #define FILL(NAME,FIELD,FIRST) \
108 if (!strncmp(NAME, line, sizeof(NAME)-1)) { \
109 strncpy(apc->items[FIELD], line+11, APCUPSD_MAXSTR); \
110 /* remove trailing newline and assure termination */ \
111 apc->items[FIELD][len-11 > APCUPSD_MAXSTR ? APCUPSD_MAXSTR : len-12] = 0; \
114 for (c = apc->items[FIELD]; *c; ++c) \
115 if (*c == ' ' && c > apc->items[FIELD]+2) { \
123 // fills in the data received from a socket
125 static int fill_items(int sock, PAPCUPSD_S apc) {
129 while ((len = get_line(sock, line, sizeof(line)))) {
130 // fill the right types in
131 FILL("UPSNAME", APCUPSD_NAME, FALSE);
132 FILL("MODEL", APCUPSD_MODEL, FALSE);
133 FILL("UPSMODE", APCUPSD_UPSMODE, FALSE);
134 FILL("CABLE", APCUPSD_CABLE, FALSE);
135 FILL("STATUS", APCUPSD_STATUS, FALSE);
136 FILL("LINEV", APCUPSD_LINEV, TRUE);
137 FILL("LOADPCT", APCUPSD_LOAD, TRUE);
138 FILL("BCHARGE", APCUPSD_CHARGE, TRUE);
139 FILL("TIMELEFT", APCUPSD_TIMELEFT, TRUE);
140 FILL("ITEMP", APCUPSD_TEMP, TRUE);
141 FILL("LASTXFER", APCUPSD_LASTXFER, FALSE);
148 // Conky update function for apcupsd data
150 void update_apcupsd(void) {
156 for (i = 0; i < _APCUPSD_COUNT; ++i)
157 memcpy(apc.items[i], "N/A", 4); // including \0
160 struct hostent* he = 0;
161 struct sockaddr_in addr;
163 #ifdef HAVE_GETHOSTBYNAME_R
164 struct hostent he_mem;
169 // connect to apcupsd daemon
171 sock = socket(AF_INET, SOCK_STREAM, 0);
176 #ifdef HAVE_GETHOSTBYNAME_R
177 if (gethostbyname_r(info.apcupsd.host, &he_mem, hostbuff, sizeof(hostbuff), &he, &he_errno)) {
178 ERR("APCUPSD gethostbyname_r: %s", hstrerror(h_errno));
181 #else /* HAVE_GETHOSTBYNAME_R */
182 he = gethostbyname(info.apcupsd.host);
184 herror("gethostbyname");
187 #endif /* HAVE_GETHOSTBYNAME_R */
189 memset(&addr, 0, sizeof(addr));
190 addr.sin_family = AF_INET;
191 addr.sin_port = info.apcupsd.port;
192 memcpy(&addr.sin_addr, he->h_addr, he->h_length);
193 if (connect(sock, (struct sockaddr*)&addr, sizeof(struct sockaddr)) < 0) {
194 // no error reporting, the daemon is probably not running
199 // send status request - "status" - 6B
202 // no waiting to become writeable is really needed
203 if (send(sock, &sz, sizeof(sz), 0) != sizeof(sz) || send(sock, "status", 6, 0) != 6) {
209 // read the lines of output and put them into the info structure
211 if (!fill_items(sock, &apc)) break;
218 // "atomically" copy the data into working set
220 memcpy(info.apcupsd.items, apc.items, sizeof(info.apcupsd.items));
225 // fills in the N/A strings and default host:port
227 void init_apcupsd(void) {
230 for (i = 0; i < _APCUPSD_COUNT; ++i)
231 memcpy(info.apcupsd.items[i], "N/A", 4); // including \0
232 memcpy(info.apcupsd.host, "localhost", 10);
233 info.apcupsd.port = htons(3551);