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"
61 #include "common.h"
62 #include "plugin.h"
64 #if defined(__OpenBSD__) || defined(__NetBSD__)
65 #undef HAVE_SYSCTLBYNAME /* force HAVE_LIBKVM_NLIST path */
66 #endif
68 #if !KERNEL_LINUX && !HAVE_SYSCTLBYNAME && !HAVE_LIBKVM_NLIST && !KERNEL_AIX
69 # error "No applicable input method."
70 #endif
72 #if KERNEL_LINUX
73 # include <asm/types.h>
74 /* sys/socket.h is necessary to compile when using netlink on older systems. */
75 # include <sys/socket.h>
76 # include <linux/netlink.h>
77 #if HAVE_LINUX_INET_DIAG_H
78 # include <linux/inet_diag.h>
79 #endif
80 # include <sys/socket.h>
81 # include <arpa/inet.h>
82 /* #endif KERNEL_LINUX */
84 #elif HAVE_SYSCTLBYNAME
85 # include <sys/socketvar.h>
86 # include <sys/sysctl.h>
88 /* Some includes needed for compiling on FreeBSD */
89 #include <sys/time.h>
90 #if HAVE_SYS_TYPES_H
91 # include <sys/types.h>
92 #endif
93 #if HAVE_SYS_SOCKET_H
94 # include <sys/socket.h>
95 #endif
96 #if HAVE_NET_IF_H
97 # include <net/if.h>
98 #endif
100 # include <net/route.h>
101 # include <netinet/in.h>
102 # include <netinet/in_systm.h>
103 # include <netinet/ip.h>
104 # include <netinet/ip6.h>
105 # include <netinet/in_pcb.h>
106 # include <netinet/ip_var.h>
107 # include <netinet/tcp.h>
108 # include <netinet/tcpip.h>
109 # include <netinet/tcp_seq.h>
110 # include <netinet/tcp_var.h>
111 /* #endif HAVE_SYSCTLBYNAME */
113 /* This is for OpenBSD and NetBSD. */
114 #elif HAVE_LIBKVM_NLIST
115 # include <sys/queue.h>
116 # include <sys/socket.h>
117 # include <net/route.h>
118 # include <netinet/in.h>
119 # include <netinet/in_systm.h>
120 # include <netinet/ip.h>
121 # include <netinet/ip_var.h>
122 # include <netinet/in_pcb.h>
123 # include <netinet/tcp.h>
124 # include <netinet/tcp_timer.h>
125 # include <netinet/tcp_var.h>
126 # include <netdb.h>
127 # include <arpa/inet.h>
128 # if !defined(HAVE_BSD_NLIST_H) || !HAVE_BSD_NLIST_H
129 # include <nlist.h>
130 # else /* HAVE_BSD_NLIST_H */
131 # include <bsd/nlist.h>
132 # endif
133 # include <kvm.h>
134 /* #endif HAVE_LIBKVM_NLIST */
136 #elif KERNEL_AIX
137 # include <arpa/inet.h>
138 # include <sys/socketvar.h>
139 #endif /* KERNEL_AIX */
141 #if KERNEL_LINUX
142 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
143 struct nlreq {
144 struct nlmsghdr nlh;
145 struct inet_diag_req r;
146 };
147 #endif
149 static const char *tcp_state[] =
150 {
151 "", /* 0 */
152 "ESTABLISHED",
153 "SYN_SENT",
154 "SYN_RECV",
155 "FIN_WAIT1",
156 "FIN_WAIT2",
157 "TIME_WAIT",
158 "CLOSED",
159 "CLOSE_WAIT",
160 "LAST_ACK",
161 "LISTEN", /* 10 */
162 "CLOSING"
163 };
165 # define TCP_STATE_LISTEN 10
166 # define TCP_STATE_MIN 1
167 # define TCP_STATE_MAX 11
168 /* #endif KERNEL_LINUX */
170 #elif HAVE_SYSCTLBYNAME
171 static const char *tcp_state[] =
172 {
173 "CLOSED",
174 "LISTEN",
175 "SYN_SENT",
176 "SYN_RECV",
177 "ESTABLISHED",
178 "CLOSE_WAIT",
179 "FIN_WAIT1",
180 "CLOSING",
181 "LAST_ACK",
182 "FIN_WAIT2",
183 "TIME_WAIT"
184 };
186 # define TCP_STATE_LISTEN 1
187 # define TCP_STATE_MIN 0
188 # define TCP_STATE_MAX 10
189 /* #endif HAVE_SYSCTLBYNAME */
191 #elif HAVE_LIBKVM_NLIST
192 static const char *tcp_state[] =
193 {
194 "CLOSED",
195 "LISTEN",
196 "SYN_SENT",
197 "SYN_RECV",
198 "ESTABLISHED",
199 "CLOSE_WAIT",
200 "FIN_WAIT1",
201 "CLOSING",
202 "LAST_ACK",
203 "FIN_WAIT2",
204 "TIME_WAIT"
205 };
207 static kvm_t *kvmd;
208 static u_long inpcbtable_off = 0;
209 struct inpcbtable *inpcbtable_ptr = NULL;
211 # define TCP_STATE_LISTEN 1
212 # define TCP_STATE_MIN 1
213 # define TCP_STATE_MAX 10
214 /* #endif HAVE_LIBKVM_NLIST */
216 #elif KERNEL_AIX
217 static const char *tcp_state[] =
218 {
219 "CLOSED",
220 "LISTEN",
221 "SYN_SENT",
222 "SYN_RECV",
223 "ESTABLISHED",
224 "CLOSE_WAIT",
225 "FIN_WAIT1",
226 "CLOSING",
227 "LAST_ACK",
228 "FIN_WAIT2",
229 "TIME_WAIT"
230 };
232 # define TCP_STATE_LISTEN 1
233 # define TCP_STATE_MIN 0
234 # define TCP_STATE_MAX 10
236 struct netinfo_conn {
237 uint32_t unknow1[2];
238 uint16_t dstport;
239 uint16_t unknow2;
240 struct in6_addr dstaddr;
241 uint16_t srcport;
242 uint16_t unknow3;
243 struct in6_addr srcaddr;
244 uint32_t unknow4[36];
245 uint16_t tcp_state;
246 uint16_t unknow5[7];
247 };
249 struct netinfo_header {
250 unsigned int proto;
251 unsigned int size;
252 };
254 # define NETINFO_TCP 3
255 extern int netinfo (int proto, void *data, int *size, int n);
256 #endif /* KERNEL_AIX */
258 #define PORT_COLLECT_LOCAL 0x01
259 #define PORT_COLLECT_REMOTE 0x02
260 #define PORT_IS_LISTENING 0x04
262 typedef struct port_entry_s
263 {
264 uint16_t port;
265 uint16_t flags;
266 uint32_t count_local[TCP_STATE_MAX + 1];
267 uint32_t count_remote[TCP_STATE_MAX + 1];
268 struct port_entry_s *next;
269 } port_entry_t;
271 static const char *config_keys[] =
272 {
273 "ListeningPorts",
274 "LocalPort",
275 "RemotePort",
276 "AllPortsSummary"
277 };
278 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
280 static int port_collect_listening = 0;
281 static int port_collect_total = 0;
282 static port_entry_t *port_list_head = NULL;
283 static uint32_t count_total[TCP_STATE_MAX + 1];
285 #if KERNEL_LINUX
286 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
287 /* This depends on linux inet_diag_req because if this structure is missing,
288 * sequence_number is useless and we get a compilation warning.
289 */
290 static uint32_t sequence_number = 0;
291 #endif
293 enum
294 {
295 SRC_DUNNO,
296 SRC_NETLINK,
297 SRC_PROC
298 } linux_source = SRC_DUNNO;
299 #endif
301 static void conn_prepare_vl (value_list_t *vl, value_t *values)
302 {
303 vl->values = values;
304 vl->values_len = 1;
305 sstrncpy (vl->host, hostname_g, sizeof (vl->host));
306 sstrncpy (vl->plugin, "tcpconns", sizeof (vl->plugin));
307 sstrncpy (vl->type, "tcp_connections", sizeof (vl->type));
308 }
310 static void conn_submit_port_entry (port_entry_t *pe)
311 {
312 value_t values[1];
313 value_list_t vl = VALUE_LIST_INIT;
314 int i;
316 conn_prepare_vl (&vl, values);
318 if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
319 || (pe->flags & PORT_COLLECT_LOCAL))
320 {
321 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
322 "%"PRIu16"-local", pe->port);
324 for (i = 1; i <= TCP_STATE_MAX; i++)
325 {
326 vl.values[0].gauge = pe->count_local[i];
328 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
330 plugin_dispatch_values (&vl);
331 }
332 }
334 if (pe->flags & PORT_COLLECT_REMOTE)
335 {
336 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
337 "%"PRIu16"-remote", pe->port);
339 for (i = 1; i <= TCP_STATE_MAX; i++)
340 {
341 vl.values[0].gauge = pe->count_remote[i];
343 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
345 plugin_dispatch_values (&vl);
346 }
347 }
348 } /* void conn_submit */
350 static void conn_submit_port_total (void)
351 {
352 value_t values[1];
353 value_list_t vl = VALUE_LIST_INIT;
354 int i;
356 conn_prepare_vl (&vl, values);
358 sstrncpy (vl.plugin_instance, "all", sizeof (vl.plugin_instance));
360 for (i = 1; i <= TCP_STATE_MAX; i++)
361 {
362 vl.values[0].gauge = count_total[i];
364 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
366 plugin_dispatch_values (&vl);
367 }
368 }
370 static void conn_submit_all (void)
371 {
372 port_entry_t *pe;
374 if (port_collect_total)
375 conn_submit_port_total ();
377 for (pe = port_list_head; pe != NULL; pe = pe->next)
378 conn_submit_port_entry (pe);
379 } /* void conn_submit_all */
381 static port_entry_t *conn_get_port_entry (uint16_t port, int create)
382 {
383 port_entry_t *ret;
385 ret = port_list_head;
386 while (ret != NULL)
387 {
388 if (ret->port == port)
389 break;
390 ret = ret->next;
391 }
393 if ((ret == NULL) && (create != 0))
394 {
395 ret = (port_entry_t *) malloc (sizeof (port_entry_t));
396 if (ret == NULL)
397 return (NULL);
398 memset (ret, '\0', sizeof (port_entry_t));
400 ret->port = port;
401 ret->next = port_list_head;
402 port_list_head = ret;
403 }
405 return (ret);
406 } /* port_entry_t *conn_get_port_entry */
408 /* Removes ports that were added automatically due to the `ListeningPorts'
409 * setting but which are no longer listening. */
410 static void conn_reset_port_entry (void)
411 {
412 port_entry_t *prev = NULL;
413 port_entry_t *pe = port_list_head;
415 memset (&count_total, '\0', sizeof(count_total));
417 while (pe != NULL)
418 {
419 /* If this entry was created while reading the files (ant not when handling
420 * the configuration) remove it now. */
421 if ((pe->flags & (PORT_COLLECT_LOCAL
422 | PORT_COLLECT_REMOTE
423 | PORT_IS_LISTENING)) == 0)
424 {
425 port_entry_t *next = pe->next;
427 DEBUG ("tcpconns plugin: Removing temporary entry "
428 "for listening port %"PRIu16, pe->port);
430 if (prev == NULL)
431 port_list_head = next;
432 else
433 prev->next = next;
435 sfree (pe);
436 pe = next;
438 continue;
439 }
441 memset (pe->count_local, '\0', sizeof (pe->count_local));
442 memset (pe->count_remote, '\0', sizeof (pe->count_remote));
443 pe->flags &= ~PORT_IS_LISTENING;
445 prev = pe;
446 pe = pe->next;
447 }
448 } /* void conn_reset_port_entry */
450 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
451 {
452 port_entry_t *pe = NULL;
454 if ((state > TCP_STATE_MAX)
455 #if TCP_STATE_MIN > 0
456 || (state < TCP_STATE_MIN)
457 #endif
458 )
459 {
460 NOTICE ("tcpconns plugin: Ignoring connection with "
461 "unknown state 0x%02"PRIx8".", state);
462 return (-1);
463 }
465 count_total[state]++;
467 /* Listening sockets */
468 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
469 {
470 pe = conn_get_port_entry (port_local, 1 /* create */);
471 if (pe != NULL)
472 pe->flags |= PORT_IS_LISTENING;
473 }
475 DEBUG ("tcpconns plugin: Connection %"PRIu16" <-> %"PRIu16" (%s)",
476 port_local, port_remote, tcp_state[state]);
478 pe = conn_get_port_entry (port_local, 0 /* no create */);
479 if (pe != NULL)
480 pe->count_local[state]++;
482 pe = conn_get_port_entry (port_remote, 0 /* no create */);
483 if (pe != NULL)
484 pe->count_remote[state]++;
486 return (0);
487 } /* int conn_handle_ports */
489 #if KERNEL_LINUX
490 /* Returns zero on success, less than zero on socket error and greater than
491 * zero on other errors. */
492 static int conn_read_netlink (void)
493 {
494 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
495 int fd;
496 struct sockaddr_nl nladdr;
497 struct nlreq req;
498 struct msghdr msg;
499 struct iovec iov;
500 struct inet_diag_msg *r;
501 char buf[8192];
503 /* If this fails, it's likely a permission problem. We'll fall back to
504 * reading this information from files below. */
505 fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
506 if (fd < 0)
507 {
508 ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
509 "NETLINK_INET_DIAG) failed: %s",
510 sstrerror (errno, buf, sizeof (buf)));
511 return (-1);
512 }
514 memset(&nladdr, 0, sizeof(nladdr));
515 nladdr.nl_family = AF_NETLINK;
517 memset(&req, 0, sizeof(req));
518 req.nlh.nlmsg_len = sizeof(req);
519 req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
520 /* NLM_F_ROOT: return the complete table instead of a single entry.
521 * NLM_F_MATCH: return all entries matching criteria (not implemented)
522 * NLM_F_REQUEST: must be set on all request messages */
523 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
524 req.nlh.nlmsg_pid = 0;
525 /* The sequence_number is used to track our messages. Since netlink is not
526 * reliable, we don't want to end up with a corrupt or incomplete old
527 * message in case the system is/was out of memory. */
528 req.nlh.nlmsg_seq = ++sequence_number;
529 req.r.idiag_family = AF_INET;
530 req.r.idiag_states = 0xfff;
531 req.r.idiag_ext = 0;
533 memset(&iov, 0, sizeof(iov));
534 iov.iov_base = &req;
535 iov.iov_len = sizeof(req);
537 memset(&msg, 0, sizeof(msg));
538 msg.msg_name = (void*)&nladdr;
539 msg.msg_namelen = sizeof(nladdr);
540 msg.msg_iov = &iov;
541 msg.msg_iovlen = 1;
543 if (sendmsg (fd, &msg, 0) < 0)
544 {
545 ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
546 sstrerror (errno, buf, sizeof (buf)));
547 close (fd);
548 return (-1);
549 }
551 iov.iov_base = buf;
552 iov.iov_len = sizeof(buf);
554 while (1)
555 {
556 int status;
557 struct nlmsghdr *h;
559 memset(&msg, 0, sizeof(msg));
560 msg.msg_name = (void*)&nladdr;
561 msg.msg_namelen = sizeof(nladdr);
562 msg.msg_iov = &iov;
563 msg.msg_iovlen = 1;
565 status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
566 if (status < 0)
567 {
568 if ((errno == EINTR) || (errno == EAGAIN))
569 continue;
571 ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
572 sstrerror (errno, buf, sizeof (buf)));
573 close (fd);
574 return (-1);
575 }
576 else if (status == 0)
577 {
578 close (fd);
579 DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
580 "reply from netlink socket.");
581 return (0);
582 }
584 h = (struct nlmsghdr*)buf;
585 while (NLMSG_OK(h, status))
586 {
587 if (h->nlmsg_seq != sequence_number)
588 {
589 h = NLMSG_NEXT(h, status);
590 continue;
591 }
593 if (h->nlmsg_type == NLMSG_DONE)
594 {
595 close (fd);
596 return (0);
597 }
598 else if (h->nlmsg_type == NLMSG_ERROR)
599 {
600 struct nlmsgerr *msg_error;
602 msg_error = NLMSG_DATA(h);
603 WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
604 msg_error->error);
606 close (fd);
607 return (1);
608 }
610 r = NLMSG_DATA(h);
612 /* This code does not (need to) distinguish between IPv4 and IPv6. */
613 conn_handle_ports (ntohs(r->id.idiag_sport),
614 ntohs(r->id.idiag_dport),
615 r->idiag_state);
617 h = NLMSG_NEXT(h, status);
618 } /* while (NLMSG_OK) */
619 } /* while (1) */
621 /* Not reached because the while() loop above handles the exit condition. */
622 return (0);
623 #else
624 return (1);
625 #endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
626 } /* int conn_read_netlink */
628 static int conn_handle_line (char *buffer)
629 {
630 char *fields[32];
631 int fields_len;
633 char *endptr;
635 char *port_local_str;
636 char *port_remote_str;
637 uint16_t port_local;
638 uint16_t port_remote;
640 uint8_t state;
642 int buffer_len = strlen (buffer);
644 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
645 buffer[--buffer_len] = '\0';
646 if (buffer_len <= 0)
647 return (-1);
649 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
650 if (fields_len < 12)
651 {
652 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
653 return (-1);
654 }
656 port_local_str = strchr (fields[1], ':');
657 port_remote_str = strchr (fields[2], ':');
659 if ((port_local_str == NULL) || (port_remote_str == NULL))
660 return (-1);
661 port_local_str++;
662 port_remote_str++;
663 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
664 return (-1);
666 endptr = NULL;
667 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
668 if ((endptr == NULL) || (*endptr != '\0'))
669 return (-1);
671 endptr = NULL;
672 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
673 if ((endptr == NULL) || (*endptr != '\0'))
674 return (-1);
676 endptr = NULL;
677 state = (uint8_t) strtol (fields[3], &endptr, 16);
678 if ((endptr == NULL) || (*endptr != '\0'))
679 return (-1);
681 return (conn_handle_ports (port_local, port_remote, state));
682 } /* int conn_handle_line */
684 static int conn_read_file (const char *file)
685 {
686 FILE *fh;
687 char buffer[1024];
689 fh = fopen (file, "r");
690 if (fh == NULL)
691 return (-1);
693 while (fgets (buffer, sizeof (buffer), fh) != NULL)
694 {
695 conn_handle_line (buffer);
696 } /* while (fgets) */
698 fclose (fh);
700 return (0);
701 } /* int conn_read_file */
702 /* #endif KERNEL_LINUX */
704 #elif HAVE_SYSCTLBYNAME
705 /* #endif HAVE_SYSCTLBYNAME */
707 #elif HAVE_LIBKVM_NLIST
708 #endif /* HAVE_LIBKVM_NLIST */
710 static int conn_config (const char *key, const char *value)
711 {
712 if (strcasecmp (key, "ListeningPorts") == 0)
713 {
714 if (IS_TRUE (value))
715 port_collect_listening = 1;
716 else
717 port_collect_listening = 0;
718 }
719 else if ((strcasecmp (key, "LocalPort") == 0)
720 || (strcasecmp (key, "RemotePort") == 0))
721 {
722 port_entry_t *pe;
723 int port = atoi (value);
725 if ((port < 1) || (port > 65535))
726 {
727 ERROR ("tcpconns plugin: Invalid port: %i", port);
728 return (1);
729 }
731 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
732 if (pe == NULL)
733 {
734 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
735 return (1);
736 }
738 if (strcasecmp (key, "LocalPort") == 0)
739 pe->flags |= PORT_COLLECT_LOCAL;
740 else
741 pe->flags |= PORT_COLLECT_REMOTE;
742 }
743 else if (strcasecmp (key, "AllPortsSummary") == 0)
744 {
745 if (IS_TRUE (value))
746 port_collect_total = 1;
747 else
748 port_collect_total = 0;
749 }
750 else
751 {
752 return (-1);
753 }
755 return (0);
756 } /* int conn_config */
758 #if KERNEL_LINUX
759 static int conn_init (void)
760 {
761 if (port_collect_total == 0 && port_list_head == NULL)
762 port_collect_listening = 1;
764 return (0);
765 } /* int conn_init */
767 static int conn_read (void)
768 {
769 int status;
771 conn_reset_port_entry ();
773 if (linux_source == SRC_NETLINK)
774 {
775 status = conn_read_netlink ();
776 }
777 else if (linux_source == SRC_PROC)
778 {
779 int errors_num = 0;
781 if (conn_read_file ("/proc/net/tcp") != 0)
782 errors_num++;
783 if (conn_read_file ("/proc/net/tcp6") != 0)
784 errors_num++;
786 if (errors_num < 2)
787 status = 0;
788 else
789 status = ENOENT;
790 }
791 else /* if (linux_source == SRC_DUNNO) */
792 {
793 /* Try to use netlink for getting this data, it is _much_ faster on systems
794 * with a large amount of connections. */
795 status = conn_read_netlink ();
796 if (status == 0)
797 {
798 INFO ("tcpconns plugin: Reading from netlink succeeded. "
799 "Will use the netlink method from now on.");
800 linux_source = SRC_NETLINK;
801 }
802 else
803 {
804 INFO ("tcpconns plugin: Reading from netlink failed. "
805 "Will read from /proc from now on.");
806 linux_source = SRC_PROC;
808 /* return success here to avoid the "plugin failed" message. */
809 return (0);
810 }
811 }
813 if (status == 0)
814 conn_submit_all ();
815 else
816 return (status);
818 return (0);
819 } /* int conn_read */
820 /* #endif KERNEL_LINUX */
822 #elif HAVE_SYSCTLBYNAME
823 static int conn_read (void)
824 {
825 int status;
826 char *buffer;
827 size_t buffer_len;;
829 struct xinpgen *in_orig;
830 struct xinpgen *in_ptr;
832 conn_reset_port_entry ();
834 buffer_len = 0;
835 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
836 if (status < 0)
837 {
838 ERROR ("tcpconns plugin: sysctlbyname failed.");
839 return (-1);
840 }
842 buffer = (char *) malloc (buffer_len);
843 if (buffer == NULL)
844 {
845 ERROR ("tcpconns plugin: malloc failed.");
846 return (-1);
847 }
849 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
850 if (status < 0)
851 {
852 ERROR ("tcpconns plugin: sysctlbyname failed.");
853 sfree (buffer);
854 return (-1);
855 }
857 if (buffer_len <= sizeof (struct xinpgen))
858 {
859 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
860 sfree (buffer);
861 return (-1);
862 }
864 in_orig = (struct xinpgen *) buffer;
865 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
866 in_ptr->xig_len > sizeof (struct xinpgen);
867 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
868 {
869 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
870 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
871 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
873 /* Ignore non-TCP sockets */
874 if (so->xso_protocol != IPPROTO_TCP)
875 continue;
877 /* Ignore PCBs which were freed during copyout. */
878 if (inp->inp_gencnt > in_orig->xig_gen)
879 continue;
881 if (((inp->inp_vflag & INP_IPV4) == 0)
882 && ((inp->inp_vflag & INP_IPV6) == 0))
883 continue;
885 conn_handle_ports (ntohs (inp->inp_lport), ntohs (inp->inp_fport),
886 tp->t_state);
887 } /* for (in_ptr) */
889 in_orig = NULL;
890 in_ptr = NULL;
891 sfree (buffer);
893 conn_submit_all ();
895 return (0);
896 } /* int conn_read */
897 /* #endif HAVE_SYSCTLBYNAME */
899 #elif HAVE_LIBKVM_NLIST
900 static int kread (u_long addr, void *buf, int size)
901 {
902 int status;
904 status = kvm_read (kvmd, addr, buf, size);
905 if (status != size)
906 {
907 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
908 status, size, kvm_geterr (kvmd));
909 return (-1);
910 }
911 return (0);
912 } /* int kread */
914 static int conn_init (void)
915 {
916 char buf[_POSIX2_LINE_MAX];
917 struct nlist nl[] =
918 {
919 #define N_TCBTABLE 0
920 { "_tcbtable" },
921 { "" }
922 };
923 int status;
925 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
926 if (kvmd == NULL)
927 {
928 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
929 return (-1);
930 }
932 status = kvm_nlist (kvmd, nl);
933 if (status < 0)
934 {
935 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
936 return (-1);
937 }
939 if (nl[N_TCBTABLE].n_type == 0)
940 {
941 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
942 "N_TCBTABLE is invalid.");
943 return (-1);
944 }
946 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
947 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
949 return (0);
950 } /* int conn_init */
952 static int conn_read (void)
953 {
954 struct inpcbtable table;
955 #if !defined(__OpenBSD__) && (defined(__NetBSD_Version__) && __NetBSD_Version__ <= 699002700)
956 struct inpcb *head;
957 #endif
958 struct inpcb *next;
959 struct inpcb inpcb;
960 struct tcpcb tcpcb;
961 int status;
963 conn_reset_port_entry ();
965 /* Read the pcbtable from the kernel */
966 status = kread (inpcbtable_off, &table, sizeof (table));
967 if (status != 0)
968 return (-1);
970 #if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
971 /* inpt_queue is a TAILQ on OpenBSD */
972 /* Get the first pcb */
973 next = (struct inpcb *)TAILQ_FIRST (&table.inpt_queue);
974 while (next)
975 #else
976 /* Get the `head' pcb */
977 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
978 /* Get the first pcb */
979 next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
981 while (next != head)
982 #endif
983 {
984 /* Read the pcb pointed to by `next' into `inpcb' */
985 status = kread ((u_long) next, &inpcb, sizeof (inpcb));
986 if (status != 0)
987 return (-1);
989 /* Advance `next' */
990 #if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
991 /* inpt_queue is a TAILQ on OpenBSD */
992 next = (struct inpcb *)TAILQ_NEXT (&inpcb, inp_queue);
993 #else
994 next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
995 #endif
997 /* Ignore sockets, that are not connected. */
998 #ifdef __NetBSD__
999 if (inpcb.inp_af == AF_INET6)
1000 continue; /* XXX see netbsd/src/usr.bin/netstat/inet6.c */
1001 #else
1002 if (!(inpcb.inp_flags & INP_IPV6)
1003 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
1004 continue;
1005 if ((inpcb.inp_flags & INP_IPV6)
1006 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
1007 continue;
1008 #endif
1010 status = kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
1011 if (status != 0)
1012 return (-1);
1013 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
1014 } /* while (next != head) */
1016 conn_submit_all ();
1018 return (0);
1019 }
1020 /* #endif HAVE_LIBKVM_NLIST */
1022 #elif KERNEL_AIX
1024 static int conn_read (void)
1025 {
1026 int size;
1027 int i;
1028 int nconn;
1029 void *data;
1030 struct netinfo_header *header;
1031 struct netinfo_conn *conn;
1033 conn_reset_port_entry ();
1035 size = netinfo(NETINFO_TCP, 0, 0, 0);
1036 if (size < 0)
1037 {
1038 ERROR ("tcpconns plugin: netinfo failed return: %i", size);
1039 return (-1);
1040 }
1042 if (size == 0)
1043 return (0);
1045 if ((size - sizeof (struct netinfo_header)) % sizeof (struct netinfo_conn))
1046 {
1047 ERROR ("tcpconns plugin: invalid buffer size");
1048 return (-1);
1049 }
1051 data = malloc(size);
1052 if (data == NULL)
1053 {
1054 ERROR ("tcpconns plugin: malloc failed");
1055 return (-1);
1056 }
1058 if (netinfo(NETINFO_TCP, data, &size, 0) < 0)
1059 {
1060 ERROR ("tcpconns plugin: netinfo failed");
1061 free(data);
1062 return (-1);
1063 }
1065 header = (struct netinfo_header *)data;
1066 nconn = header->size;
1067 conn = (struct netinfo_conn *)(data + sizeof(struct netinfo_header));
1069 for (i=0; i < nconn; conn++, i++)
1070 {
1071 conn_handle_ports (conn->srcport, conn->dstport, conn->tcp_state);
1072 }
1074 free(data);
1076 conn_submit_all ();
1078 return (0);
1079 }
1080 #endif /* KERNEL_AIX */
1082 void module_register (void)
1083 {
1084 plugin_register_config ("tcpconns", conn_config,
1085 config_keys, config_keys_num);
1086 #if KERNEL_LINUX
1087 plugin_register_init ("tcpconns", conn_init);
1088 #elif HAVE_SYSCTLBYNAME
1089 /* no initialization */
1090 #elif HAVE_LIBKVM_NLIST
1091 plugin_register_init ("tcpconns", conn_init);
1092 #elif KERNEL_AIX
1093 /* no initialization */
1094 #endif
1095 plugin_register_read ("tcpconns", conn_read);
1096 } /* void module_register */
1098 /*
1099 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :
1100 */