2 * collectd - src/tcpconns.c
3 * Copyright (C) 2007 Florian octo Forster
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.
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.
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
19 * Florian octo Forster <octo at verplant.org>
23 * Code within `__OpenBSD__' blocks is provided under the following license:
25 * $collectd: parts of tcpconns.c, 2008/08/08 03:48:30 Michael Stapelberg $
26 * $OpenBSD: inet.c,v 1.100 2007/06/19 05:28:30 ray Exp $
27 * $NetBSD: inet.c,v 1.14 1995/10/03 21:42:37 thorpej Exp $
29 * Copyright (c) 1983, 1988, 1993
30 * The Regents of the University of California. All rights reserved.
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. Neither the name of the University nor the names of its contributors
41 * may be used to endorse or promote products derived from this software
42 * without specific prior written permission.
44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 #if !KERNEL_LINUX && !HAVE_SYSCTLBYNAME && !__OpenBSD__
62 # error "No applicable input method."
66 /* #endif KERNEL_LINUX */
68 #elif HAVE_SYSCTLBYNAME
69 # include <sys/socketvar.h>
70 # include <sys/sysctl.h>
72 /* Some includes needed for compiling on FreeBSD */
75 # include <sys/types.h>
78 # include <sys/socket.h>
84 # include <net/route.h>
85 # include <netinet/in.h>
86 # include <netinet/in_systm.h>
87 # include <netinet/ip.h>
88 # include <netinet/ip6.h>
89 # include <netinet/in_pcb.h>
90 # include <netinet/ip_var.h>
91 # include <netinet/tcp.h>
92 # include <netinet/tcpip.h>
93 # include <netinet/tcp_seq.h>
94 # include <netinet/tcp_var.h>
95 /* #endif HAVE_SYSCTLBYNAME */
98 # include <sys/queue.h>
99 # include <sys/socket.h>
100 # include <net/route.h>
101 # include <netinet/in.h>
102 # include <netinet/in_systm.h>
103 # include <netinet/ip.h>
104 # include <netinet/in_pcb.h>
105 # include <netinet/tcp.h>
106 # include <netinet/tcp_timer.h>
107 # include <netinet/tcp_var.h>
109 # include <arpa/inet.h>
112 #endif /* __OpenBSD__ */
115 static const char *tcp_state[] =
131 # define TCP_STATE_LISTEN 10
132 # define TCP_STATE_MIN 1
133 # define TCP_STATE_MAX 11
134 /* #endif KERNEL_LINUX */
136 #elif HAVE_SYSCTLBYNAME
137 static const char *tcp_state[] =
152 # define TCP_STATE_LISTEN 1
153 # define TCP_STATE_MIN 0
154 # define TCP_STATE_MAX 10
155 /* #endif HAVE_SYSCTLBYNAME */
158 static const char *tcp_state[] =
174 static u_long inpcbtable_off = 0;
175 struct inpcbtable *inpcbtable_ptr = NULL;
178 static struct nlist nl[] = { /* {{{ */
203 #define N_IGMPSTAT 12
205 #define N_MRTPROTO 13
209 #define N_MFCHASHTBL 15
224 #define N_ETHERIPSTAT 23
228 #define N_ICMP6STAT 25
230 #define N_PIM6STAT 26
232 #define N_MRT6PROTO 27
234 #define N_MRT6STAT 28
236 #define N_MF6CTABLE 29
238 #define N_MIF6TABLE 30
244 #define N_IPCOMPSTAT 33
246 #define N_RIP6STAT 34
248 #define N_CARPSTAT 35
250 #define N_RAWIPTABLE 36
252 #define N_RAWIP6TABLE 37
253 { "_rawin6pcbtable" },
254 #define N_PFSYNCSTAT 38
258 #define N_AF2RTAFIDX 40
260 #define N_RTBLIDMAX 41
266 }; /* }}} struct nlist nl[] */
269 # define TCP_STATE_LISTEN 1
270 # define TCP_STATE_MIN 1
271 # define TCP_STATE_MAX 10
272 #endif /* __OpenBSD__ */
274 #define PORT_COLLECT_LOCAL 0x01
275 #define PORT_COLLECT_REMOTE 0x02
276 #define PORT_IS_LISTENING 0x04
278 typedef struct port_entry_s
282 uint32_t count_local[TCP_STATE_MAX + 1];
283 uint32_t count_remote[TCP_STATE_MAX + 1];
284 struct port_entry_s *next;
287 static const char *config_keys[] =
293 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
295 static int port_collect_listening = 0;
296 static port_entry_t *port_list_head = NULL;
298 static void conn_submit_port_entry (port_entry_t *pe)
301 value_list_t vl = VALUE_LIST_INIT;
306 vl.time = time (NULL);
307 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
308 sstrncpy (vl.plugin, "tcpconns", sizeof (vl.plugin));
309 sstrncpy (vl.type, "tcp_connections", sizeof (vl.type));
311 if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
312 || (pe->flags & PORT_COLLECT_LOCAL))
314 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
315 "%hu-local", pe->port);
317 for (i = 1; i <= TCP_STATE_MAX; i++)
319 vl.values[0].gauge = pe->count_local[i];
321 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
323 plugin_dispatch_values (&vl);
327 if (pe->flags & PORT_COLLECT_REMOTE)
329 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
330 "%hu-remote", pe->port);
332 for (i = 1; i <= TCP_STATE_MAX; i++)
334 vl.values[0].gauge = pe->count_remote[i];
336 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
338 plugin_dispatch_values (&vl);
341 } /* void conn_submit */
343 static void conn_submit_all (void)
347 for (pe = port_list_head; pe != NULL; pe = pe->next)
348 conn_submit_port_entry (pe);
349 } /* void conn_submit_all */
351 static port_entry_t *conn_get_port_entry (uint16_t port, int create)
355 ret = port_list_head;
358 if (ret->port == port)
363 if ((ret == NULL) && (create != 0))
365 ret = (port_entry_t *) malloc (sizeof (port_entry_t));
368 memset (ret, '\0', sizeof (port_entry_t));
371 ret->next = port_list_head;
372 port_list_head = ret;
376 } /* port_entry_t *conn_get_port_entry */
378 /* Removes ports that were added automatically due to the `ListeningPorts'
379 * setting but which are no longer listening. */
380 static void conn_reset_port_entry (void)
382 port_entry_t *prev = NULL;
383 port_entry_t *pe = port_list_head;
387 /* If this entry was created while reading the files (ant not when handling
388 * the configuration) remove it now. */
389 if ((pe->flags & (PORT_COLLECT_LOCAL
390 | PORT_COLLECT_REMOTE
391 | PORT_IS_LISTENING)) == 0)
393 port_entry_t *next = pe->next;
395 DEBUG ("tcpconns plugin: Removing temporary entry "
396 "for listening port %hu", pe->port);
399 port_list_head = next;
409 memset (pe->count_local, '\0', sizeof (pe->count_local));
410 memset (pe->count_remote, '\0', sizeof (pe->count_remote));
411 pe->flags &= ~PORT_IS_LISTENING;
415 } /* void conn_reset_port_entry */
417 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
419 port_entry_t *pe = NULL;
421 if ((state > TCP_STATE_MAX)
422 #if TCP_STATE_MIN > 0
423 || (state < TCP_STATE_MIN)
427 NOTICE ("tcpconns plugin: Ignoring connection with unknown state 0x%02x.",
432 /* Listening sockets */
433 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
435 pe = conn_get_port_entry (port_local, 1 /* create */);
437 pe->flags |= PORT_IS_LISTENING;
440 DEBUG ("tcpconns plugin: Connection %hu <-> %hu (%s)",
441 port_local, port_remote, tcp_state[state]);
443 pe = conn_get_port_entry (port_local, 0 /* no create */);
445 pe->count_local[state]++;
447 pe = conn_get_port_entry (port_remote, 0 /* no create */);
449 pe->count_remote[state]++;
452 } /* int conn_handle_ports */
455 static int conn_handle_line (char *buffer)
462 char *port_local_str;
463 char *port_remote_str;
465 uint16_t port_remote;
469 int buffer_len = strlen (buffer);
471 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
472 buffer[--buffer_len] = '\0';
476 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
479 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
483 port_local_str = strchr (fields[1], ':');
484 port_remote_str = strchr (fields[2], ':');
486 if ((port_local_str == NULL) || (port_remote_str == NULL))
490 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
494 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
495 if ((endptr == NULL) || (*endptr != '\0'))
499 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
500 if ((endptr == NULL) || (*endptr != '\0'))
504 state = (uint8_t) strtol (fields[3], &endptr, 16);
505 if ((endptr == NULL) || (*endptr != '\0'))
508 return (conn_handle_ports (port_local, port_remote, state));
509 } /* int conn_handle_line */
511 static int conn_read_file (const char *file)
516 fh = fopen (file, "r");
520 while (fgets (buffer, sizeof (buffer), fh) != NULL)
522 conn_handle_line (buffer);
523 } /* while (fgets) */
528 } /* int conn_read_file */
529 /* #endif KERNEL_LINUX */
531 #elif HAVE_SYSCTLBYNAME
532 /* #endif HAVE_SYSCTLBYNAME */
535 #endif /* __OpenBSD__ */
537 static int conn_config (const char *key, const char *value)
539 if (strcasecmp (key, "ListeningPorts") == 0)
541 if ((strcasecmp (value, "Yes") == 0)
542 || (strcasecmp (value, "True") == 0)
543 || (strcasecmp (value, "On") == 0))
544 port_collect_listening = 1;
546 port_collect_listening = 0;
548 else if ((strcasecmp (key, "LocalPort") == 0)
549 || (strcasecmp (key, "RemotePort") == 0))
552 int port = atoi (value);
554 if ((port < 1) || (port > 65535))
556 ERROR ("tcpconns plugin: Invalid port: %i", port);
560 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
563 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
567 if (strcasecmp (key, "LocalPort") == 0)
568 pe->flags |= PORT_COLLECT_LOCAL;
570 pe->flags |= PORT_COLLECT_REMOTE;
578 } /* int conn_config */
581 static int conn_init (void)
583 if (port_list_head == NULL)
584 port_collect_listening = 1;
587 } /* int conn_init */
589 static int conn_read (void)
593 conn_reset_port_entry ();
595 if (conn_read_file ("/proc/net/tcp") != 0)
597 if (conn_read_file ("/proc/net/tcp6") != 0)
606 ERROR ("tcpconns plugin: Neither /proc/net/tcp nor /proc/net/tcp6 "
612 } /* int conn_read */
613 /* #endif KERNEL_LINUX */
615 #elif HAVE_SYSCTLBYNAME
616 static int conn_read (void)
622 struct xinpgen *in_orig;
623 struct xinpgen *in_ptr;
625 conn_reset_port_entry ();
628 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
631 ERROR ("tcpconns plugin: sysctlbyname failed.");
635 buffer = (char *) malloc (buffer_len);
638 ERROR ("tcpconns plugin: malloc failed.");
642 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
645 ERROR ("tcpconns plugin: sysctlbyname failed.");
650 if (buffer_len <= sizeof (struct xinpgen))
652 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
657 in_orig = (struct xinpgen *) buffer;
658 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
659 in_ptr->xig_len > sizeof (struct xinpgen);
660 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
662 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
663 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
664 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
666 /* Ignore non-TCP sockets */
667 if (so->xso_protocol != IPPROTO_TCP)
670 /* Ignore PCBs which were freed during copyout. */
671 if (inp->inp_gencnt > in_orig->xig_gen)
674 if (((inp->inp_vflag & INP_IPV4) == 0)
675 && ((inp->inp_vflag & INP_IPV6) == 0))
678 conn_handle_ports (inp->inp_lport, inp->inp_fport, tp->t_state);
688 } /* int conn_read */
689 /* #endif HAVE_SYSCTLBYNAME */
692 static int kread (u_long addr, void *buf, int size)
696 status = kvm_read (kvmd, addr, buf, size);
699 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
700 status, size, kvm_geterr (kvmd));
706 static int conn_init (void)
708 char buf[_POSIX2_LINE_MAX];
717 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
720 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
724 status = kvm_nlist (kvmd, nl);
727 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
731 if (nl[N_TCBTABLE].n_type == 0)
733 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
734 "N_TCBTABLE is invalid.");
738 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
739 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
742 } /* int conn_init */
744 static int conn_read (void)
746 u_long off = nl[2].n_value;
747 struct inpcbtable table;
754 conn_reset_port_entry ();
756 /* Read the pcbtable from the kernel */
757 status = kread (inpcbtable_off, &table, sizeof (table));
761 /* Get the `head' pcb */
762 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
763 /* Get the first pcb */
764 next = CIRCLEQ_FIRST (&table.inpt_queue);
768 /* Read the pcb pointed to by `next' into `inpcb' */
769 kread ((u_long) next, &inpcb, sizeof (inpcb));
772 next = CIRCLEQ_NEXT (&inpcb, inp_queue);
774 /* Ignore sockets, that are not connected. */
775 if (!(inpcb.inp_flags & INP_IPV6)
776 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
778 if ((inpcb.inp_flags & INP_IPV6)
779 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
782 kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
783 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
784 } /* while (next != head) */
790 #endif /* __OpenBSD__ */
792 void module_register (void)
794 plugin_register_config ("tcpconns", conn_config,
795 config_keys, config_keys_num);
797 plugin_register_init ("tcpconns", conn_init);
798 #elif HAVE_SYSCTLBYNAME
799 /* no initialization */
801 plugin_register_init ("tcpconns", conn_init);
803 plugin_register_read ("tcpconns", conn_read);
804 } /* void module_register */
807 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :