7d6e7997e0fc3fba9f2a05c91802e98e40c9da1d
1 /**
2 * collectd - src/tcpconns.c
3 * Copyright (C) 2007 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Author:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
26 #if !KERNEL_LINUX
27 # error "No applicable input method."
28 #endif
30 #define PORT_COLLECT_LOCAL 0x01
31 #define PORT_COLLECT_REMOTE 0x02
32 #define PORT_IS_LISTENING 0x04
34 typedef struct port_entry_s
35 {
36 uint16_t port;
37 uint16_t flags;
38 uint32_t count_local;
39 uint32_t count_remote;
40 struct port_entry_s *next;
41 } port_entry_t;
43 static const char *config_keys[] =
44 {
45 "ListeningPorts",
46 "LocalPort",
47 "RemotePort"
48 };
49 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
51 static int port_collect_listening = 0;
52 static port_entry_t *port_list_head = NULL;
54 static void conn_submit_port_entry (port_entry_t *pe)
55 {
56 value_t values[1];
57 value_list_t vl = VALUE_LIST_INIT;
59 vl.values = values;
60 vl.values_len = 1;
61 vl.time = time (NULL);
62 strcpy (vl.host, hostname_g);
63 strcpy (vl.plugin, "tcpconns");
64 snprintf (vl.type_instance, sizeof (vl.type_instance), "%hu", pe->port);
65 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
67 if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
68 || (pe->flags & PORT_COLLECT_LOCAL))
69 {
70 values[0].gauge = pe->count_local;
71 strcpy (vl.plugin_instance, "local");
72 plugin_dispatch_values ("tcp_connections", &vl);
73 }
74 if (pe->flags & PORT_COLLECT_REMOTE)
75 {
76 values[0].gauge = pe->count_remote;
77 strcpy (vl.plugin_instance, "remote");
78 plugin_dispatch_values ("tcp_connections", &vl);
79 }
80 } /* void conn_submit */
82 static void conn_submit_all (void)
83 {
84 port_entry_t *pe;
86 for (pe = port_list_head; pe != NULL; pe = pe->next)
87 conn_submit_port_entry (pe);
88 } /* void conn_submit_all */
90 static port_entry_t *conn_get_port_entry (uint16_t port, int create)
91 {
92 port_entry_t *ret;
94 ret = port_list_head;
95 while (ret != NULL)
96 {
97 if (ret->port == port)
98 break;
99 ret = ret->next;
100 }
102 if ((ret == NULL) && (create != 0))
103 {
104 ret = (port_entry_t *) malloc (sizeof (port_entry_t));
105 if (ret == NULL)
106 return (NULL);
107 memset (ret, '\0', sizeof (port_entry_t));
109 ret->port = port;
110 ret->next = port_list_head;
111 port_list_head = ret;
112 }
114 return (ret);
115 } /* port_entry_t *conn_get_port_entry */
117 static void conn_reset_port_entry (void)
118 {
119 port_entry_t *prev = NULL;
120 port_entry_t *pe = port_list_head;
122 while (pe != NULL)
123 {
124 /* If this entry was created while reading the files (ant not when handling
125 * the configuration) remove it now. */
126 if ((pe->flags & (PORT_COLLECT_LOCAL | PORT_COLLECT_REMOTE)) == 0)
127 {
128 port_entry_t *next = pe->next;
130 DEBUG ("tcpconns plugin: Removing temporary entry "
131 "for listening port %hu", pe->port);
133 if (prev == NULL)
134 port_list_head = next;
135 else
136 prev->next = next;
138 sfree (pe);
139 pe = next;
141 continue;
142 }
144 pe->count_local = 0;
145 pe->count_remote = 0;
147 pe->flags &= ~PORT_IS_LISTENING;
149 pe = pe->next;
150 }
151 } /* void conn_reset_port_entry */
153 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
154 {
155 /* Listening sockets */
156 if ((state == 0x0a) && (port_collect_listening != 0))
157 {
158 port_entry_t *pe;
160 DEBUG ("tcpconns plugin: Adding listening port %hu", port_local);
162 pe = conn_get_port_entry (port_local, 1 /* create */);
163 if (pe != NULL)
164 {
165 pe->count_local++;
166 pe->flags |= PORT_IS_LISTENING;
167 }
168 }
169 /* Established connections */
170 else if (state == 0x01)
171 {
172 port_entry_t *pe;
174 DEBUG ("tcpconns plugin: Established connection %hu <-> %hu",
175 port_local, port_remote);
177 pe = conn_get_port_entry (port_local, 0 /* no create */);
178 if ((pe != NULL) && (pe->flags & PORT_COLLECT_LOCAL))
179 pe->count_local++;
181 pe = conn_get_port_entry (port_remote, 0 /* no create */);
182 if ((pe != NULL) && (pe->flags & PORT_COLLECT_REMOTE))
183 pe->count_remote++;
184 }
185 else
186 {
187 DEBUG ("tcpconns plugin: Ignoring unknown state 0x%x", state);
188 }
190 return (0);
191 } /* int conn_handle_ports */
193 static int conn_handle_line (char *buffer)
194 {
195 char *fields[32];
196 int fields_len;
198 char *endptr;
200 char *port_local_str;
201 char *port_remote_str;
202 uint16_t port_local;
203 uint16_t port_remote;
205 uint8_t state;
207 int buffer_len = strlen (buffer);
209 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
210 buffer[--buffer_len] = '\0';
211 if (buffer_len <= 0)
212 return (-1);
214 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
215 if (fields_len < 12)
216 {
217 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
218 return (-1);
219 }
221 port_local_str = strchr (fields[1], ':');
222 port_remote_str = strchr (fields[2], ':');
224 if ((port_local_str == NULL) || (port_remote_str == NULL))
225 return (-1);
226 port_local_str++;
227 port_remote_str++;
228 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
229 return (-1);
231 endptr = NULL;
232 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
233 if ((endptr == NULL) || (*endptr != '\0'))
234 return (-1);
236 endptr = NULL;
237 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
238 if ((endptr == NULL) || (*endptr != '\0'))
239 return (-1);
241 endptr = NULL;
242 state = (uint8_t) strtol (fields[3], &endptr, 16);
243 if ((endptr == NULL) || (*endptr != '\0'))
244 return (-1);
246 return (conn_handle_ports (port_local, port_remote, state));
247 } /* int conn_handle_line */
249 static int conn_read_file (const char *file)
250 {
251 FILE *fh;
252 char buffer[1024];
254 fh = fopen (file, "r");
255 if (fh == NULL)
256 {
257 char errbuf[1024];
258 ERROR ("tcpconns plugin: fopen (%s) failed: %s",
259 file, sstrerror (errno, errbuf, sizeof (errbuf)));
260 return (-1);
261 }
263 while (fgets (buffer, sizeof (buffer), fh) != NULL)
264 {
265 conn_handle_line (buffer);
266 } /* while (fgets) */
268 fclose (fh);
270 return (0);
271 } /* int conn_read_file */
273 static int conn_config (const char *key, const char *value)
274 {
275 if (strcasecmp (key, "ListeningPorts") == 0)
276 {
277 if ((strcasecmp (value, "Yes") == 0)
278 || (strcasecmp (value, "True") == 0)
279 || (strcasecmp (value, "On") == 0))
280 port_collect_listening = 1;
281 else
282 port_collect_listening = 0;
283 }
284 else if ((strcasecmp (key, "LocalPort") == 0)
285 || (strcasecmp (key, "RemotePort") == 0))
286 {
287 port_entry_t *pe;
288 int port = atoi (value);
290 if ((port < 1) || (port > 65535))
291 {
292 ERROR ("tcpconns plugin: Invalid port: %i", port);
293 return (1);
294 }
296 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
297 if (pe == NULL)
298 {
299 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
300 return (1);
301 }
303 if (strcasecmp (key, "LocalPort") == 0)
304 pe->flags |= PORT_COLLECT_LOCAL;
305 else
306 pe->flags |= PORT_COLLECT_REMOTE;
307 }
308 else
309 {
310 return (-1);
311 }
313 return (0);
314 } /* int conn_config */
316 static int conn_init (void)
317 {
318 if (port_list_head == NULL)
319 port_collect_listening = 1;
321 return (0);
322 } /* int conn_init */
324 static int conn_read (void)
325 {
326 conn_reset_port_entry ();
328 conn_read_file ("/proc/net/tcp");
329 conn_read_file ("/proc/net/tcp6");
331 conn_submit_all ();
333 return (0);
334 } /* int conn_read */
336 void module_register (void)
337 {
338 plugin_register_config ("tcpconns", conn_config,
339 config_keys, config_keys_num);
340 plugin_register_init ("tcpconns", conn_init);
341 plugin_register_read ("tcpconns", conn_read);
342 } /* void module_register */
344 /*
345 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 :
346 */