1 /**
2 * collectd - src/tcpconns.c
3 * Copyright (C) 2007,2008 Florian octo Forster
4 * Copyright (C) 2008 Michael Stapelberg
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Author:
20 * Florian octo Forster <octo at collectd.org>
21 * Michael Stapelberg <michael+git at stapelberg.de>
22 **/
24 /**
25 * Code within `HAVE_LIBKVM_NLIST' blocks is provided under the following
26 * license:
27 *
28 * $collectd: parts of tcpconns.c, 2008/08/08 03:48:30 Michael Stapelberg $
29 * $OpenBSD: inet.c,v 1.100 2007/06/19 05:28:30 ray Exp $
30 * $NetBSD: inet.c,v 1.14 1995/10/03 21:42:37 thorpej Exp $
31 *
32 * Copyright (c) 1983, 1988, 1993
33 * The Regents of the University of California. All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the University nor the names of its contributors
44 * may be used to endorse or promote products derived from this software
45 * without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57 * SUCH DAMAGE.
58 */
60 #include "collectd.h"
62 #include "common.h"
63 #include "plugin.h"
65 #if defined(__OpenBSD__) || defined(__NetBSD__)
66 #undef HAVE_SYSCTLBYNAME /* force HAVE_LIBKVM_NLIST path */
67 #endif
69 #if !KERNEL_LINUX && !HAVE_SYSCTLBYNAME && !HAVE_LIBKVM_NLIST && !KERNEL_AIX
70 # error "No applicable input method."
71 #endif
73 #if KERNEL_LINUX
74 # include <asm/types.h>
75 # include <linux/netlink.h>
76 #if HAVE_LINUX_INET_DIAG_H
77 # include <linux/inet_diag.h>
78 #endif
79 # include <arpa/inet.h>
80 /* #endif KERNEL_LINUX */
82 #elif HAVE_SYSCTLBYNAME
83 # include <sys/socketvar.h>
84 # include <sys/sysctl.h>
86 /* Some includes needed for compiling on FreeBSD */
87 #include <sys/time.h>
88 #if HAVE_SYS_TYPES_H
89 # include <sys/types.h>
90 #endif
91 #if HAVE_NET_IF_H
92 # include <net/if.h>
93 #endif
95 # include <net/route.h>
96 # include <netinet/in.h>
97 # include <netinet/in_systm.h>
98 # include <netinet/ip.h>
99 # include <netinet/ip6.h>
100 # include <netinet/in_pcb.h>
101 # include <netinet/ip_var.h>
102 # include <netinet/tcp.h>
103 # include <netinet/tcpip.h>
104 # include <netinet/tcp_seq.h>
105 # include <netinet/tcp_var.h>
106 /* #endif HAVE_SYSCTLBYNAME */
108 /* This is for OpenBSD and NetBSD. */
109 #elif HAVE_LIBKVM_NLIST
110 # include <sys/queue.h>
111 # include <net/route.h>
112 # include <netinet/in.h>
113 # include <netinet/in_systm.h>
114 # include <netinet/ip.h>
115 # include <netinet/ip_var.h>
116 # include <netinet/in_pcb.h>
117 # include <netinet/tcp.h>
118 # include <netinet/tcp_timer.h>
119 # include <netinet/tcp_var.h>
120 # include <netdb.h>
121 # include <arpa/inet.h>
122 # if !defined(HAVE_BSD_NLIST_H) || !HAVE_BSD_NLIST_H
123 # include <nlist.h>
124 # else /* HAVE_BSD_NLIST_H */
125 # include <bsd/nlist.h>
126 # endif
127 # include <kvm.h>
128 /* #endif HAVE_LIBKVM_NLIST */
130 #elif KERNEL_AIX
131 # include <arpa/inet.h>
132 # include <sys/socketvar.h>
133 #endif /* KERNEL_AIX */
135 #if KERNEL_LINUX
136 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
137 struct nlreq {
138 struct nlmsghdr nlh;
139 struct inet_diag_req r;
140 };
141 #endif
143 static const char *tcp_state[] =
144 {
145 "", /* 0 */
146 "ESTABLISHED",
147 "SYN_SENT",
148 "SYN_RECV",
149 "FIN_WAIT1",
150 "FIN_WAIT2",
151 "TIME_WAIT",
152 "CLOSED",
153 "CLOSE_WAIT",
154 "LAST_ACK",
155 "LISTEN", /* 10 */
156 "CLOSING"
157 };
159 # define TCP_STATE_LISTEN 10
160 # define TCP_STATE_MIN 1
161 # define TCP_STATE_MAX 11
162 /* #endif KERNEL_LINUX */
164 #elif HAVE_SYSCTLBYNAME
165 static const char *tcp_state[] =
166 {
167 "CLOSED",
168 "LISTEN",
169 "SYN_SENT",
170 "SYN_RECV",
171 "ESTABLISHED",
172 "CLOSE_WAIT",
173 "FIN_WAIT1",
174 "CLOSING",
175 "LAST_ACK",
176 "FIN_WAIT2",
177 "TIME_WAIT"
178 };
180 # define TCP_STATE_LISTEN 1
181 # define TCP_STATE_MIN 0
182 # define TCP_STATE_MAX 10
183 /* #endif HAVE_SYSCTLBYNAME */
185 #elif HAVE_LIBKVM_NLIST
186 static const char *tcp_state[] =
187 {
188 "CLOSED",
189 "LISTEN",
190 "SYN_SENT",
191 "SYN_RECV",
192 "ESTABLISHED",
193 "CLOSE_WAIT",
194 "FIN_WAIT1",
195 "CLOSING",
196 "LAST_ACK",
197 "FIN_WAIT2",
198 "TIME_WAIT"
199 };
201 static kvm_t *kvmd;
202 static u_long inpcbtable_off = 0;
203 struct inpcbtable *inpcbtable_ptr = NULL;
205 # define TCP_STATE_LISTEN 1
206 # define TCP_STATE_MIN 1
207 # define TCP_STATE_MAX 10
208 /* #endif HAVE_LIBKVM_NLIST */
210 #elif KERNEL_AIX
211 static const char *tcp_state[] =
212 {
213 "CLOSED",
214 "LISTEN",
215 "SYN_SENT",
216 "SYN_RECV",
217 "ESTABLISHED",
218 "CLOSE_WAIT",
219 "FIN_WAIT1",
220 "CLOSING",
221 "LAST_ACK",
222 "FIN_WAIT2",
223 "TIME_WAIT"
224 };
226 # define TCP_STATE_LISTEN 1
227 # define TCP_STATE_MIN 0
228 # define TCP_STATE_MAX 10
230 struct netinfo_conn {
231 uint32_t unknow1[2];
232 uint16_t dstport;
233 uint16_t unknow2;
234 struct in6_addr dstaddr;
235 uint16_t srcport;
236 uint16_t unknow3;
237 struct in6_addr srcaddr;
238 uint32_t unknow4[36];
239 uint16_t tcp_state;
240 uint16_t unknow5[7];
241 };
243 struct netinfo_header {
244 unsigned int proto;
245 unsigned int size;
246 };
248 # define NETINFO_TCP 3
249 extern int netinfo (int proto, void *data, int *size, int n);
250 #endif /* KERNEL_AIX */
252 #define PORT_COLLECT_LOCAL 0x01
253 #define PORT_COLLECT_REMOTE 0x02
254 #define PORT_IS_LISTENING 0x04
256 typedef struct port_entry_s
257 {
258 uint16_t port;
259 uint16_t flags;
260 uint32_t count_local[TCP_STATE_MAX + 1];
261 uint32_t count_remote[TCP_STATE_MAX + 1];
262 struct port_entry_s *next;
263 } port_entry_t;
265 static const char *config_keys[] =
266 {
267 "ListeningPorts",
268 "LocalPort",
269 "RemotePort",
270 "AllPortsSummary"
271 };
272 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
274 static int port_collect_listening = 0;
275 static int port_collect_total = 0;
276 static port_entry_t *port_list_head = NULL;
277 static uint32_t count_total[TCP_STATE_MAX + 1];
279 #if KERNEL_LINUX
280 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
281 /* This depends on linux inet_diag_req because if this structure is missing,
282 * sequence_number is useless and we get a compilation warning.
283 */
284 static uint32_t sequence_number = 0;
285 #endif
287 static enum
288 {
289 SRC_DUNNO,
290 SRC_NETLINK,
291 SRC_PROC
292 } linux_source = SRC_DUNNO;
293 #endif
295 static void conn_prepare_vl (value_list_t *vl, value_t *values)
296 {
297 vl->values = values;
298 vl->values_len = 1;
299 sstrncpy (vl->host, hostname_g, sizeof (vl->host));
300 sstrncpy (vl->plugin, "tcpconns", sizeof (vl->plugin));
301 sstrncpy (vl->type, "tcp_connections", sizeof (vl->type));
302 }
304 static void conn_submit_port_entry (port_entry_t *pe)
305 {
306 value_t values[1];
307 value_list_t vl = VALUE_LIST_INIT;
309 conn_prepare_vl (&vl, values);
311 if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
312 || (pe->flags & PORT_COLLECT_LOCAL))
313 {
314 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
315 "%"PRIu16"-local", pe->port);
317 for (int i = 1; i <= TCP_STATE_MAX; i++)
318 {
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);
324 }
325 }
327 if (pe->flags & PORT_COLLECT_REMOTE)
328 {
329 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
330 "%"PRIu16"-remote", pe->port);
332 for (int i = 1; i <= TCP_STATE_MAX; i++)
333 {
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);
339 }
340 }
341 } /* void conn_submit */
343 static void conn_submit_port_total (void)
344 {
345 value_t values[1];
346 value_list_t vl = VALUE_LIST_INIT;
348 conn_prepare_vl (&vl, values);
350 sstrncpy (vl.plugin_instance, "all", sizeof (vl.plugin_instance));
352 for (int i = 1; i <= TCP_STATE_MAX; i++)
353 {
354 vl.values[0].gauge = count_total[i];
356 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
358 plugin_dispatch_values (&vl);
359 }
360 }
362 static void conn_submit_all (void)
363 {
364 if (port_collect_total)
365 conn_submit_port_total ();
367 for (port_entry_t *pe = port_list_head; pe != NULL; pe = pe->next)
368 conn_submit_port_entry (pe);
369 } /* void conn_submit_all */
371 static port_entry_t *conn_get_port_entry (uint16_t port, int create)
372 {
373 port_entry_t *ret;
375 ret = port_list_head;
376 while (ret != NULL)
377 {
378 if (ret->port == port)
379 break;
380 ret = ret->next;
381 }
383 if ((ret == NULL) && (create != 0))
384 {
385 ret = calloc (1, sizeof (*ret));
386 if (ret == NULL)
387 return (NULL);
389 ret->port = port;
390 ret->next = port_list_head;
391 port_list_head = ret;
392 }
394 return (ret);
395 } /* port_entry_t *conn_get_port_entry */
397 /* Removes ports that were added automatically due to the `ListeningPorts'
398 * setting but which are no longer listening. */
399 static void conn_reset_port_entry (void)
400 {
401 port_entry_t *prev = NULL;
402 port_entry_t *pe = port_list_head;
404 memset (&count_total, '\0', sizeof(count_total));
406 while (pe != NULL)
407 {
408 /* If this entry was created while reading the files (ant not when handling
409 * the configuration) remove it now. */
410 if ((pe->flags & (PORT_COLLECT_LOCAL
411 | PORT_COLLECT_REMOTE
412 | PORT_IS_LISTENING)) == 0)
413 {
414 port_entry_t *next = pe->next;
416 DEBUG ("tcpconns plugin: Removing temporary entry "
417 "for listening port %"PRIu16, pe->port);
419 if (prev == NULL)
420 port_list_head = next;
421 else
422 prev->next = next;
424 sfree (pe);
425 pe = next;
427 continue;
428 }
430 memset (pe->count_local, '\0', sizeof (pe->count_local));
431 memset (pe->count_remote, '\0', sizeof (pe->count_remote));
432 pe->flags &= ~PORT_IS_LISTENING;
434 prev = pe;
435 pe = pe->next;
436 }
437 } /* void conn_reset_port_entry */
439 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
440 {
441 port_entry_t *pe = NULL;
443 if ((state > TCP_STATE_MAX)
444 #if TCP_STATE_MIN > 0
445 || (state < TCP_STATE_MIN)
446 #endif
447 )
448 {
449 NOTICE ("tcpconns plugin: Ignoring connection with "
450 "unknown state 0x%02"PRIx8".", state);
451 return (-1);
452 }
454 count_total[state]++;
456 /* Listening sockets */
457 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
458 {
459 pe = conn_get_port_entry (port_local, 1 /* create */);
460 if (pe != NULL)
461 pe->flags |= PORT_IS_LISTENING;
462 }
464 DEBUG ("tcpconns plugin: Connection %"PRIu16" <-> %"PRIu16" (%s)",
465 port_local, port_remote, tcp_state[state]);
467 pe = conn_get_port_entry (port_local, 0 /* no create */);
468 if (pe != NULL)
469 pe->count_local[state]++;
471 pe = conn_get_port_entry (port_remote, 0 /* no create */);
472 if (pe != NULL)
473 pe->count_remote[state]++;
475 return (0);
476 } /* int conn_handle_ports */
478 #if KERNEL_LINUX
479 /* Returns zero on success, less than zero on socket error and greater than
480 * zero on other errors. */
481 static int conn_read_netlink (void)
482 {
483 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
484 int fd;
485 struct inet_diag_msg *r;
486 char buf[8192];
488 /* If this fails, it's likely a permission problem. We'll fall back to
489 * reading this information from files below. */
490 fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
491 if (fd < 0)
492 {
493 ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
494 "NETLINK_INET_DIAG) failed: %s",
495 sstrerror (errno, buf, sizeof (buf)));
496 return (-1);
497 }
499 struct sockaddr_nl nladdr = {
500 .nl_family = AF_NETLINK
501 };
503 struct nlreq req = {
504 .nlh.nlmsg_len = sizeof(req),
505 .nlh.nlmsg_type = TCPDIAG_GETSOCK,
506 /* NLM_F_ROOT: return the complete table instead of a single entry.
507 * NLM_F_MATCH: return all entries matching criteria (not implemented)
508 * NLM_F_REQUEST: must be set on all request messages */
509 .nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST,
510 .nlh.nlmsg_pid = 0,
511 /* The sequence_number is used to track our messages. Since netlink is not
512 * reliable, we don't want to end up with a corrupt or incomplete old
513 * message in case the system is/was out of memory. */
514 .nlh.nlmsg_seq = ++sequence_number,
515 .r.idiag_family = AF_INET,
516 .r.idiag_states = 0xfff,
517 .r.idiag_ext = 0
518 };
520 struct iovec iov = {
521 .iov_base = &req,
522 .iov_len = sizeof(req)
523 };
525 struct msghdr msg = {
526 .msg_name = (void*)&nladdr,
527 .msg_namelen = sizeof(nladdr),
528 .msg_iov = &iov,
529 .msg_iovlen = 1
530 };
532 if (sendmsg (fd, &msg, 0) < 0)
533 {
534 ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
535 sstrerror (errno, buf, sizeof (buf)));
536 close (fd);
537 return (-1);
538 }
540 iov.iov_base = buf;
541 iov.iov_len = sizeof(buf);
543 while (1)
544 {
545 int status;
546 struct nlmsghdr *h;
548 memset(&msg, 0, sizeof(msg));
549 msg.msg_name = (void*)&nladdr;
550 msg.msg_namelen = sizeof(nladdr);
551 msg.msg_iov = &iov;
552 msg.msg_iovlen = 1;
554 status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
555 if (status < 0)
556 {
557 if ((errno == EINTR) || (errno == EAGAIN))
558 continue;
560 ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
561 sstrerror (errno, buf, sizeof (buf)));
562 close (fd);
563 return (-1);
564 }
565 else if (status == 0)
566 {
567 close (fd);
568 DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
569 "reply from netlink socket.");
570 return (0);
571 }
573 h = (struct nlmsghdr*)buf;
574 while (NLMSG_OK(h, status))
575 {
576 if (h->nlmsg_seq != sequence_number)
577 {
578 h = NLMSG_NEXT(h, status);
579 continue;
580 }
582 if (h->nlmsg_type == NLMSG_DONE)
583 {
584 close (fd);
585 return (0);
586 }
587 else if (h->nlmsg_type == NLMSG_ERROR)
588 {
589 struct nlmsgerr *msg_error;
591 msg_error = NLMSG_DATA(h);
592 WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
593 msg_error->error);
595 close (fd);
596 return (1);
597 }
599 r = NLMSG_DATA(h);
601 /* This code does not (need to) distinguish between IPv4 and IPv6. */
602 conn_handle_ports (ntohs(r->id.idiag_sport),
603 ntohs(r->id.idiag_dport),
604 r->idiag_state);
606 h = NLMSG_NEXT(h, status);
607 } /* while (NLMSG_OK) */
608 } /* while (1) */
610 /* Not reached because the while() loop above handles the exit condition. */
611 return (0);
612 #else
613 return (1);
614 #endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
615 } /* int conn_read_netlink */
617 static int conn_handle_line (char *buffer)
618 {
619 char *fields[32];
620 int fields_len;
622 char *endptr;
624 char *port_local_str;
625 char *port_remote_str;
626 uint16_t port_local;
627 uint16_t port_remote;
629 uint8_t state;
631 int buffer_len = strlen (buffer);
633 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
634 buffer[--buffer_len] = '\0';
635 if (buffer_len <= 0)
636 return (-1);
638 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
639 if (fields_len < 12)
640 {
641 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
642 return (-1);
643 }
645 port_local_str = strchr (fields[1], ':');
646 port_remote_str = strchr (fields[2], ':');
648 if ((port_local_str == NULL) || (port_remote_str == NULL))
649 return (-1);
650 port_local_str++;
651 port_remote_str++;
652 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
653 return (-1);
655 endptr = NULL;
656 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
657 if ((endptr == NULL) || (*endptr != '\0'))
658 return (-1);
660 endptr = NULL;
661 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
662 if ((endptr == NULL) || (*endptr != '\0'))
663 return (-1);
665 endptr = NULL;
666 state = (uint8_t) strtol (fields[3], &endptr, 16);
667 if ((endptr == NULL) || (*endptr != '\0'))
668 return (-1);
670 return (conn_handle_ports (port_local, port_remote, state));
671 } /* int conn_handle_line */
673 static int conn_read_file (const char *file)
674 {
675 FILE *fh;
676 char buffer[1024];
678 fh = fopen (file, "r");
679 if (fh == NULL)
680 return (-1);
682 while (fgets (buffer, sizeof (buffer), fh) != NULL)
683 {
684 conn_handle_line (buffer);
685 } /* while (fgets) */
687 fclose (fh);
689 return (0);
690 } /* int conn_read_file */
691 /* #endif KERNEL_LINUX */
693 #elif HAVE_SYSCTLBYNAME
694 /* #endif HAVE_SYSCTLBYNAME */
696 #elif HAVE_LIBKVM_NLIST
697 #endif /* HAVE_LIBKVM_NLIST */
699 static int conn_config (const char *key, const char *value)
700 {
701 if (strcasecmp (key, "ListeningPorts") == 0)
702 {
703 if (IS_TRUE (value))
704 port_collect_listening = 1;
705 else
706 port_collect_listening = 0;
707 }
708 else if ((strcasecmp (key, "LocalPort") == 0)
709 || (strcasecmp (key, "RemotePort") == 0))
710 {
711 port_entry_t *pe;
712 int port = atoi (value);
714 if ((port < 1) || (port > 65535))
715 {
716 ERROR ("tcpconns plugin: Invalid port: %i", port);
717 return (1);
718 }
720 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
721 if (pe == NULL)
722 {
723 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
724 return (1);
725 }
727 if (strcasecmp (key, "LocalPort") == 0)
728 pe->flags |= PORT_COLLECT_LOCAL;
729 else
730 pe->flags |= PORT_COLLECT_REMOTE;
731 }
732 else if (strcasecmp (key, "AllPortsSummary") == 0)
733 {
734 if (IS_TRUE (value))
735 port_collect_total = 1;
736 else
737 port_collect_total = 0;
738 }
739 else
740 {
741 return (-1);
742 }
744 return (0);
745 } /* int conn_config */
747 #if KERNEL_LINUX
748 static int conn_init (void)
749 {
750 if (port_collect_total == 0 && port_list_head == NULL)
751 port_collect_listening = 1;
753 return (0);
754 } /* int conn_init */
756 static int conn_read (void)
757 {
758 int status;
760 conn_reset_port_entry ();
762 if (linux_source == SRC_NETLINK)
763 {
764 status = conn_read_netlink ();
765 }
766 else if (linux_source == SRC_PROC)
767 {
768 int errors_num = 0;
770 if (conn_read_file ("/proc/net/tcp") != 0)
771 errors_num++;
772 if (conn_read_file ("/proc/net/tcp6") != 0)
773 errors_num++;
775 if (errors_num < 2)
776 status = 0;
777 else
778 status = ENOENT;
779 }
780 else /* if (linux_source == SRC_DUNNO) */
781 {
782 /* Try to use netlink for getting this data, it is _much_ faster on systems
783 * with a large amount of connections. */
784 status = conn_read_netlink ();
785 if (status == 0)
786 {
787 INFO ("tcpconns plugin: Reading from netlink succeeded. "
788 "Will use the netlink method from now on.");
789 linux_source = SRC_NETLINK;
790 }
791 else
792 {
793 INFO ("tcpconns plugin: Reading from netlink failed. "
794 "Will read from /proc from now on.");
795 linux_source = SRC_PROC;
797 /* return success here to avoid the "plugin failed" message. */
798 return (0);
799 }
800 }
802 if (status == 0)
803 conn_submit_all ();
804 else
805 return (status);
807 return (0);
808 } /* int conn_read */
809 /* #endif KERNEL_LINUX */
811 #elif HAVE_SYSCTLBYNAME
812 static int conn_read (void)
813 {
814 int status;
815 char *buffer;
816 size_t buffer_len;;
818 struct xinpgen *in_orig;
819 struct xinpgen *in_ptr;
821 conn_reset_port_entry ();
823 buffer_len = 0;
824 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
825 if (status < 0)
826 {
827 ERROR ("tcpconns plugin: sysctlbyname failed.");
828 return (-1);
829 }
831 buffer = malloc (buffer_len);
832 if (buffer == NULL)
833 {
834 ERROR ("tcpconns plugin: malloc failed.");
835 return (-1);
836 }
838 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
839 if (status < 0)
840 {
841 ERROR ("tcpconns plugin: sysctlbyname failed.");
842 sfree (buffer);
843 return (-1);
844 }
846 if (buffer_len <= sizeof (struct xinpgen))
847 {
848 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
849 sfree (buffer);
850 return (-1);
851 }
853 in_orig = (struct xinpgen *) buffer;
854 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
855 in_ptr->xig_len > sizeof (struct xinpgen);
856 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
857 {
858 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
859 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
860 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
862 /* Ignore non-TCP sockets */
863 if (so->xso_protocol != IPPROTO_TCP)
864 continue;
866 /* Ignore PCBs which were freed during copyout. */
867 if (inp->inp_gencnt > in_orig->xig_gen)
868 continue;
870 if (((inp->inp_vflag & INP_IPV4) == 0)
871 && ((inp->inp_vflag & INP_IPV6) == 0))
872 continue;
874 conn_handle_ports (ntohs (inp->inp_lport), ntohs (inp->inp_fport),
875 tp->t_state);
876 } /* for (in_ptr) */
878 in_orig = NULL;
879 in_ptr = NULL;
880 sfree (buffer);
882 conn_submit_all ();
884 return (0);
885 } /* int conn_read */
886 /* #endif HAVE_SYSCTLBYNAME */
888 #elif HAVE_LIBKVM_NLIST
889 static int kread (u_long addr, void *buf, int size)
890 {
891 int status;
893 status = kvm_read (kvmd, addr, buf, size);
894 if (status != size)
895 {
896 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
897 status, size, kvm_geterr (kvmd));
898 return (-1);
899 }
900 return (0);
901 } /* int kread */
903 static int conn_init (void)
904 {
905 char buf[_POSIX2_LINE_MAX];
906 struct nlist nl[] =
907 {
908 #define N_TCBTABLE 0
909 { "_tcbtable" },
910 { "" }
911 };
912 int status;
914 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
915 if (kvmd == NULL)
916 {
917 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
918 return (-1);
919 }
921 status = kvm_nlist (kvmd, nl);
922 if (status < 0)
923 {
924 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
925 return (-1);
926 }
928 if (nl[N_TCBTABLE].n_type == 0)
929 {
930 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
931 "N_TCBTABLE is invalid.");
932 return (-1);
933 }
935 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
936 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
938 return (0);
939 } /* int conn_init */
941 static int conn_read (void)
942 {
943 struct inpcbtable table;
944 #if !defined(__OpenBSD__) && (defined(__NetBSD_Version__) && __NetBSD_Version__ <= 699002700)
945 struct inpcb *head;
946 #endif
947 struct inpcb *next;
948 struct inpcb inpcb;
949 struct tcpcb tcpcb;
950 int status;
952 conn_reset_port_entry ();
954 /* Read the pcbtable from the kernel */
955 status = kread (inpcbtable_off, &table, sizeof (table));
956 if (status != 0)
957 return (-1);
959 #if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
960 /* inpt_queue is a TAILQ on OpenBSD */
961 /* Get the first pcb */
962 next = (struct inpcb *)TAILQ_FIRST (&table.inpt_queue);
963 while (next)
964 #else
965 /* Get the `head' pcb */
966 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
967 /* Get the first pcb */
968 next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
970 while (next != head)
971 #endif
972 {
973 /* Read the pcb pointed to by `next' into `inpcb' */
974 status = kread ((u_long) next, &inpcb, sizeof (inpcb));
975 if (status != 0)
976 return (-1);
978 /* Advance `next' */
979 #if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
980 /* inpt_queue is a TAILQ on OpenBSD */
981 next = (struct inpcb *)TAILQ_NEXT (&inpcb, inp_queue);
982 #else
983 next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
984 #endif
986 /* Ignore sockets, that are not connected. */
987 #ifdef __NetBSD__
988 if (inpcb.inp_af == AF_INET6)
989 continue; /* XXX see netbsd/src/usr.bin/netstat/inet6.c */
990 #else
991 if (!(inpcb.inp_flags & INP_IPV6)
992 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
993 continue;
994 if ((inpcb.inp_flags & INP_IPV6)
995 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
996 continue;
997 #endif
999 status = kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
1000 if (status != 0)
1001 return (-1);
1002 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
1003 } /* while (next != head) */
1005 conn_submit_all ();
1007 return (0);
1008 }
1009 /* #endif HAVE_LIBKVM_NLIST */
1011 #elif KERNEL_AIX
1013 static int conn_read (void)
1014 {
1015 int size;
1016 int nconn;
1017 void *data;
1018 struct netinfo_header *header;
1019 struct netinfo_conn *conn;
1021 conn_reset_port_entry ();
1023 size = netinfo(NETINFO_TCP, 0, 0, 0);
1024 if (size < 0)
1025 {
1026 ERROR ("tcpconns plugin: netinfo failed return: %i", size);
1027 return (-1);
1028 }
1030 if (size == 0)
1031 return (0);
1033 if ((size - sizeof (struct netinfo_header)) % sizeof (struct netinfo_conn))
1034 {
1035 ERROR ("tcpconns plugin: invalid buffer size");
1036 return (-1);
1037 }
1039 data = malloc(size);
1040 if (data == NULL)
1041 {
1042 ERROR ("tcpconns plugin: malloc failed");
1043 return (-1);
1044 }
1046 if (netinfo(NETINFO_TCP, data, &size, 0) < 0)
1047 {
1048 ERROR ("tcpconns plugin: netinfo failed");
1049 free(data);
1050 return (-1);
1051 }
1053 header = (struct netinfo_header *)data;
1054 nconn = header->size;
1055 conn = (struct netinfo_conn *)(data + sizeof(struct netinfo_header));
1057 for (int i = 0; i < nconn; conn++, i++)
1058 {
1059 conn_handle_ports (conn->srcport, conn->dstport, conn->tcp_state);
1060 }
1062 free(data);
1064 conn_submit_all ();
1066 return (0);
1067 }
1068 #endif /* KERNEL_AIX */
1070 void module_register (void)
1071 {
1072 plugin_register_config ("tcpconns", conn_config,
1073 config_keys, config_keys_num);
1074 #if KERNEL_LINUX
1075 plugin_register_init ("tcpconns", conn_init);
1076 #elif HAVE_SYSCTLBYNAME
1077 /* no initialization */
1078 #elif HAVE_LIBKVM_NLIST
1079 plugin_register_init ("tcpconns", conn_init);
1080 #elif KERNEL_AIX
1081 /* no initialization */
1082 #endif
1083 plugin_register_read ("tcpconns", conn_read);
1084 } /* void module_register */
1086 /*
1087 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :
1088 */