1 /**
2 * collectd - src/ipvs.c (based on ipvsadm and libipvs)
3 * Copyright (C) 1997 Steven Clarke <steven@monmouth.demon.co.uk>
4 * Copyright (C) 1998-2004 Wensong Zhang <wensong@linuxvirtualserver.org>
5 * Copyright (C) 2003-2004 Peter Kese <peter.kese@ijs.si>
6 * Copyright (C) 2007 Sebastian Harl
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; only version 2 of the License is applicable.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 * Authors:
22 * Sebastian Harl <sh at tokkee.org>
23 **/
25 /*
26 * This plugin collects statistics about IPVS connections. It requires Linux
27 * kernels >= 2.6.
28 *
29 * See http://www.linuxvirtualserver.org/software/index.html for more
30 * information about IPVS.
31 */
33 #include "collectd.h"
34 #include "plugin.h"
35 #include "common.h"
37 #if HAVE_ARPA_INET_H
38 # include <arpa/inet.h>
39 #endif /* HAVE_ARPA_INET_H */
40 #if HAVE_SYS_SOCKET_H
41 # include <sys/socket.h>
42 #endif /* HAVE_SYS_SOCKET_H */
43 #if HAVE_NETINET_IN_H
44 # include <netinet/in.h>
45 #endif /* HAVE_NETINET_IN_H */
47 /* this can probably only be found in the kernel sources */
48 #if HAVE_LINUX_IP_VS_H
49 # include <linux/ip_vs.h>
50 #elif HAVE_NET_IP_VS_H
51 # include <net/ip_vs.h>
52 #elif HAVE_IP_VS_H
53 # include <ip_vs.h>
54 #endif /* HAVE_IP_VS_H */
56 #define log_err(...) ERROR ("ipvs: " __VA_ARGS__)
57 #define log_info(...) INFO ("ipvs: " __VA_ARGS__)
59 /*
60 * private variables
61 */
62 static int sockfd = -1;
64 /*
65 * libipvs API
66 */
67 static struct ip_vs_get_services *ipvs_get_services (void)
68 {
69 struct ip_vs_getinfo ipvs_info;
70 struct ip_vs_get_services *ret;
72 socklen_t len;
74 len = sizeof (ipvs_info);
76 if (0 != getsockopt (sockfd, IPPROTO_IP, IP_VS_SO_GET_INFO,
77 (void *)&ipvs_info, &len)) {
78 char errbuf[1024];
79 log_err ("ip_vs_get_services: getsockopt() failed: %s",
80 sstrerror (errno, errbuf, sizeof (errbuf)));
81 return NULL;
82 }
84 len = sizeof (*ret) +
85 sizeof (struct ip_vs_service_entry) * ipvs_info.num_services;
87 if (NULL == (ret = malloc (len))) {
88 log_err ("ipvs_get_services: Out of memory.");
89 exit (3);
90 }
92 ret->num_services = ipvs_info.num_services;
94 if (0 != getsockopt (sockfd, IPPROTO_IP, IP_VS_SO_GET_SERVICES,
95 (void *)ret, &len)) {
96 char errbuf[1024];
97 log_err ("ipvs_get_services: getsockopt failed: %s",
98 sstrerror (errno, errbuf, sizeof (errbuf)));
100 free(ret);
101 return NULL;
102 }
103 return ret;
104 } /* ipvs_get_services */
106 static struct ip_vs_get_dests *ipvs_get_dests (struct ip_vs_service_entry *se)
107 {
108 struct ip_vs_get_dests *ret;
109 socklen_t len;
111 len = sizeof (*ret) + sizeof (struct ip_vs_dest_entry) * se->num_dests;
113 if (NULL == (ret = malloc (len))) {
114 log_err ("ipvs_get_dests: Out of memory.");
115 exit (3);
116 }
118 ret->fwmark = se->fwmark;
119 ret->protocol = se->protocol;
120 ret->addr = se->addr;
121 ret->port = se->port;
122 ret->num_dests = se->num_dests;
124 if (0 != getsockopt (sockfd, IPPROTO_IP, IP_VS_SO_GET_DESTS,
125 (void *)ret, &len)) {
126 char errbuf[1024];
127 log_err ("ipvs_get_dests: getsockopt() failed: %s",
128 sstrerror (errno, errbuf, sizeof (errbuf)));
129 free (ret);
130 return NULL;
131 }
132 return ret;
133 } /* ip_vs_get_dests */
135 /*
136 * collectd plugin API and helper functions
137 */
138 static int cipvs_init (void)
139 {
140 struct ip_vs_getinfo ipvs_info;
142 socklen_t len;
144 if (-1 == (sockfd = socket (AF_INET, SOCK_RAW, IPPROTO_RAW))) {
145 char errbuf[1024];
146 log_err ("cipvs_init: socket() failed: %s",
147 sstrerror (errno, errbuf, sizeof (errbuf)));
148 return -1;
149 }
151 len = sizeof (ipvs_info);
153 if (0 != getsockopt (sockfd, IPPROTO_IP, IP_VS_SO_GET_INFO,
154 (void *)&ipvs_info, &len)) {
155 char errbuf[1024];
156 log_err ("cipvs_init: getsockopt() failed: %s",
157 sstrerror (errno, errbuf, sizeof (errbuf)));
158 close (sockfd);
159 sockfd = -1;
160 return -1;
161 }
163 /* we need IPVS >= 1.1.4 */
164 if (ipvs_info.version < ((1 << 16) + (1 << 8) + 4)) {
165 log_err ("cipvs_init: IPVS version too old (%d.%d.%d < %d.%d.%d)",
166 NVERSION (ipvs_info.version), 1, 1, 4);
167 close (sockfd);
168 sockfd = -1;
169 return -1;
170 }
171 else {
172 log_info ("Successfully connected to IPVS %d.%d.%d",
173 NVERSION (ipvs_info.version));
174 }
175 return 0;
176 } /* cipvs_init */
178 /*
179 * ipvs-<virtual IP>_{UDP,TCP}<port>/<type>-total
180 * ipvs-<virtual IP>_{UDP,TCP}<port>/<type>-<real IP>_<port>
181 */
183 /* plugin instance */
184 static int get_pi (struct ip_vs_service_entry *se, char *pi, size_t size)
185 {
186 struct in_addr addr;
187 int len = 0;
189 if ((NULL == se) || (NULL == pi))
190 return 0;
192 addr.s_addr = se->addr;
194 /* inet_ntoa() returns a pointer to a statically allocated buffer
195 * I hope non-glibc systems behave the same */
196 len = ssnprintf (pi, size, "%s_%s%u", inet_ntoa (addr),
197 (se->protocol == IPPROTO_TCP) ? "TCP" : "UDP",
198 ntohs (se->port));
200 if ((0 > len) || (size <= len)) {
201 log_err ("plugin instance truncated: %s", pi);
202 return -1;
203 }
204 return 0;
205 } /* get_pi */
207 /* type instance */
208 static int get_ti (struct ip_vs_dest_entry *de, char *ti, size_t size)
209 {
210 struct in_addr addr;
211 int len = 0;
213 if ((NULL == de) || (NULL == ti))
214 return 0;
216 addr.s_addr = de->addr;
218 /* inet_ntoa() returns a pointer to a statically allocated buffer
219 * I hope non-glibc systems behave the same */
220 len = ssnprintf (ti, size, "%s_%u", inet_ntoa (addr),
221 ntohs (de->port));
223 if ((0 > len) || (size <= len)) {
224 log_err ("type instance truncated: %s", ti);
225 return -1;
226 }
227 return 0;
228 } /* get_ti */
230 static void cipvs_submit_connections (char *pi, char *ti, derive_t value)
231 {
232 value_t values[1];
233 value_list_t vl = VALUE_LIST_INIT;
235 values[0].derive = value;
237 vl.values = values;
238 vl.values_len = 1;
240 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
241 sstrncpy (vl.plugin, "ipvs", sizeof (vl.plugin));
242 sstrncpy (vl.plugin_instance, pi, sizeof (vl.plugin_instance));
243 sstrncpy (vl.type, "connections", sizeof (vl.type));
244 sstrncpy (vl.type_instance, (NULL != ti) ? ti : "total",
245 sizeof (vl.type_instance));
247 plugin_dispatch_values (&vl);
248 return;
249 } /* cipvs_submit_connections */
251 static void cipvs_submit_if (char *pi, char *t, char *ti,
252 derive_t rx, derive_t tx)
253 {
254 value_t values[2];
255 value_list_t vl = VALUE_LIST_INIT;
257 values[0].derive = rx;
258 values[1].derive = tx;
260 vl.values = values;
261 vl.values_len = 2;
263 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
264 sstrncpy (vl.plugin, "ipvs", sizeof (vl.plugin));
265 sstrncpy (vl.plugin_instance, pi, sizeof (vl.plugin_instance));
266 sstrncpy (vl.type, t, sizeof (vl.type));
267 sstrncpy (vl.type_instance, (NULL != ti) ? ti : "total",
268 sizeof (vl.type_instance));
270 plugin_dispatch_values (&vl);
271 return;
272 } /* cipvs_submit_if */
274 static void cipvs_submit_dest (char *pi, struct ip_vs_dest_entry *de) {
275 struct ip_vs_stats_user stats = de->stats;
277 char ti[DATA_MAX_NAME_LEN];
279 if (0 != get_ti (de, ti, sizeof (ti)))
280 return;
282 cipvs_submit_connections (pi, ti, stats.conns);
283 cipvs_submit_if (pi, "if_packets", ti, stats.inpkts, stats.outpkts);
284 cipvs_submit_if (pi, "if_octets", ti, stats.inbytes, stats.outbytes);
285 return;
286 } /* cipvs_submit_dest */
288 static void cipvs_submit_service (struct ip_vs_service_entry *se)
289 {
290 struct ip_vs_stats_user stats = se->stats;
291 struct ip_vs_get_dests *dests = ipvs_get_dests (se);
293 char pi[DATA_MAX_NAME_LEN];
295 int i = 0;
297 if (0 != get_pi (se, pi, sizeof (pi)))
298 return;
300 cipvs_submit_connections (pi, NULL, stats.conns);
301 cipvs_submit_if (pi, "if_packets", NULL, stats.inpkts, stats.outpkts);
302 cipvs_submit_if (pi, "if_octets", NULL, stats.inbytes, stats.outbytes);
304 for (i = 0; i < dests->num_dests; ++i)
305 cipvs_submit_dest (pi, &dests->entrytable[i]);
307 free (dests);
308 return;
309 } /* cipvs_submit_service */
311 static int cipvs_read (void)
312 {
313 struct ip_vs_get_services *services = NULL;
314 int i = 0;
316 if (sockfd < 0)
317 return (-1);
319 if (NULL == (services = ipvs_get_services ()))
320 return -1;
322 for (i = 0; i < services->num_services; ++i)
323 cipvs_submit_service (&services->entrytable[i]);
325 free (services);
326 return 0;
327 } /* cipvs_read */
329 static int cipvs_shutdown (void)
330 {
331 if (sockfd >= 0)
332 close (sockfd);
333 sockfd = -1;
335 return 0;
336 } /* cipvs_shutdown */
338 void module_register (void)
339 {
340 plugin_register_init ("ipvs", cipvs_init);
341 plugin_register_read ("ipvs", cipvs_read);
342 plugin_register_shutdown ("ipvs", cipvs_shutdown);
343 return;
344 } /* module_register */
346 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */