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 pe = pe->next;
446 }
447 } /* void conn_reset_port_entry */
449 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
450 {
451 port_entry_t *pe = NULL;
453 if ((state > TCP_STATE_MAX)
454 #if TCP_STATE_MIN > 0
455 || (state < TCP_STATE_MIN)
456 #endif
457 )
458 {
459 NOTICE ("tcpconns plugin: Ignoring connection with "
460 "unknown state 0x%02"PRIx8".", state);
461 return (-1);
462 }
464 count_total[state]++;
466 /* Listening sockets */
467 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
468 {
469 pe = conn_get_port_entry (port_local, 1 /* create */);
470 if (pe != NULL)
471 pe->flags |= PORT_IS_LISTENING;
472 }
474 DEBUG ("tcpconns plugin: Connection %"PRIu16" <-> %"PRIu16" (%s)",
475 port_local, port_remote, tcp_state[state]);
477 pe = conn_get_port_entry (port_local, 0 /* no create */);
478 if (pe != NULL)
479 pe->count_local[state]++;
481 pe = conn_get_port_entry (port_remote, 0 /* no create */);
482 if (pe != NULL)
483 pe->count_remote[state]++;
485 return (0);
486 } /* int conn_handle_ports */
488 #if KERNEL_LINUX
489 /* Returns zero on success, less than zero on socket error and greater than
490 * zero on other errors. */
491 static int conn_read_netlink (void)
492 {
493 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
494 int fd;
495 struct sockaddr_nl nladdr;
496 struct nlreq req;
497 struct msghdr msg;
498 struct iovec iov;
499 struct inet_diag_msg *r;
500 char buf[8192];
502 /* If this fails, it's likely a permission problem. We'll fall back to
503 * reading this information from files below. */
504 fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
505 if (fd < 0)
506 {
507 ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
508 "NETLINK_INET_DIAG) failed: %s",
509 sstrerror (errno, buf, sizeof (buf)));
510 return (-1);
511 }
513 memset(&nladdr, 0, sizeof(nladdr));
514 nladdr.nl_family = AF_NETLINK;
516 memset(&req, 0, sizeof(req));
517 req.nlh.nlmsg_len = sizeof(req);
518 req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
519 /* NLM_F_ROOT: return the complete table instead of a single entry.
520 * NLM_F_MATCH: return all entries matching criteria (not implemented)
521 * NLM_F_REQUEST: must be set on all request messages */
522 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
523 req.nlh.nlmsg_pid = 0;
524 /* The sequence_number is used to track our messages. Since netlink is not
525 * reliable, we don't want to end up with a corrupt or incomplete old
526 * message in case the system is/was out of memory. */
527 req.nlh.nlmsg_seq = ++sequence_number;
528 req.r.idiag_family = AF_INET;
529 req.r.idiag_states = 0xfff;
530 req.r.idiag_ext = 0;
532 memset(&iov, 0, sizeof(iov));
533 iov.iov_base = &req;
534 iov.iov_len = sizeof(req);
536 memset(&msg, 0, sizeof(msg));
537 msg.msg_name = (void*)&nladdr;
538 msg.msg_namelen = sizeof(nladdr);
539 msg.msg_iov = &iov;
540 msg.msg_iovlen = 1;
542 if (sendmsg (fd, &msg, 0) < 0)
543 {
544 ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
545 sstrerror (errno, buf, sizeof (buf)));
546 close (fd);
547 return (-1);
548 }
550 iov.iov_base = buf;
551 iov.iov_len = sizeof(buf);
553 while (1)
554 {
555 int status;
556 struct nlmsghdr *h;
558 memset(&msg, 0, sizeof(msg));
559 msg.msg_name = (void*)&nladdr;
560 msg.msg_namelen = sizeof(nladdr);
561 msg.msg_iov = &iov;
562 msg.msg_iovlen = 1;
564 status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
565 if (status < 0)
566 {
567 if ((errno == EINTR) || (errno == EAGAIN))
568 continue;
570 ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
571 sstrerror (errno, buf, sizeof (buf)));
572 close (fd);
573 return (-1);
574 }
575 else if (status == 0)
576 {
577 close (fd);
578 DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
579 "reply from netlink socket.");
580 return (0);
581 }
583 h = (struct nlmsghdr*)buf;
584 while (NLMSG_OK(h, status))
585 {
586 if (h->nlmsg_seq != sequence_number)
587 {
588 h = NLMSG_NEXT(h, status);
589 continue;
590 }
592 if (h->nlmsg_type == NLMSG_DONE)
593 {
594 close (fd);
595 return (0);
596 }
597 else if (h->nlmsg_type == NLMSG_ERROR)
598 {
599 struct nlmsgerr *msg_error;
601 msg_error = NLMSG_DATA(h);
602 WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
603 msg_error->error);
605 close (fd);
606 return (1);
607 }
609 r = NLMSG_DATA(h);
611 /* This code does not (need to) distinguish between IPv4 and IPv6. */
612 conn_handle_ports (ntohs(r->id.idiag_sport),
613 ntohs(r->id.idiag_dport),
614 r->idiag_state);
616 h = NLMSG_NEXT(h, status);
617 } /* while (NLMSG_OK) */
618 } /* while (1) */
620 /* Not reached because the while() loop above handles the exit condition. */
621 return (0);
622 #else
623 return (1);
624 #endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
625 } /* int conn_read_netlink */
627 static int conn_handle_line (char *buffer)
628 {
629 char *fields[32];
630 int fields_len;
632 char *endptr;
634 char *port_local_str;
635 char *port_remote_str;
636 uint16_t port_local;
637 uint16_t port_remote;
639 uint8_t state;
641 int buffer_len = strlen (buffer);
643 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
644 buffer[--buffer_len] = '\0';
645 if (buffer_len <= 0)
646 return (-1);
648 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
649 if (fields_len < 12)
650 {
651 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
652 return (-1);
653 }
655 port_local_str = strchr (fields[1], ':');
656 port_remote_str = strchr (fields[2], ':');
658 if ((port_local_str == NULL) || (port_remote_str == NULL))
659 return (-1);
660 port_local_str++;
661 port_remote_str++;
662 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
663 return (-1);
665 endptr = NULL;
666 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
667 if ((endptr == NULL) || (*endptr != '\0'))
668 return (-1);
670 endptr = NULL;
671 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
672 if ((endptr == NULL) || (*endptr != '\0'))
673 return (-1);
675 endptr = NULL;
676 state = (uint8_t) strtol (fields[3], &endptr, 16);
677 if ((endptr == NULL) || (*endptr != '\0'))
678 return (-1);
680 return (conn_handle_ports (port_local, port_remote, state));
681 } /* int conn_handle_line */
683 static int conn_read_file (const char *file)
684 {
685 FILE *fh;
686 char buffer[1024];
688 fh = fopen (file, "r");
689 if (fh == NULL)
690 return (-1);
692 while (fgets (buffer, sizeof (buffer), fh) != NULL)
693 {
694 conn_handle_line (buffer);
695 } /* while (fgets) */
697 fclose (fh);
699 return (0);
700 } /* int conn_read_file */
701 /* #endif KERNEL_LINUX */
703 #elif HAVE_SYSCTLBYNAME
704 /* #endif HAVE_SYSCTLBYNAME */
706 #elif HAVE_LIBKVM_NLIST
707 #endif /* HAVE_LIBKVM_NLIST */
709 static int conn_config (const char *key, const char *value)
710 {
711 if (strcasecmp (key, "ListeningPorts") == 0)
712 {
713 if (IS_TRUE (value))
714 port_collect_listening = 1;
715 else
716 port_collect_listening = 0;
717 }
718 else if ((strcasecmp (key, "LocalPort") == 0)
719 || (strcasecmp (key, "RemotePort") == 0))
720 {
721 port_entry_t *pe;
722 int port = atoi (value);
724 if ((port < 1) || (port > 65535))
725 {
726 ERROR ("tcpconns plugin: Invalid port: %i", port);
727 return (1);
728 }
730 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
731 if (pe == NULL)
732 {
733 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
734 return (1);
735 }
737 if (strcasecmp (key, "LocalPort") == 0)
738 pe->flags |= PORT_COLLECT_LOCAL;
739 else
740 pe->flags |= PORT_COLLECT_REMOTE;
741 }
742 else if (strcasecmp (key, "AllPortsSummary") == 0)
743 {
744 if (IS_TRUE (value))
745 port_collect_total = 1;
746 else
747 port_collect_total = 0;
748 }
749 else
750 {
751 return (-1);
752 }
754 return (0);
755 } /* int conn_config */
757 #if KERNEL_LINUX
758 static int conn_init (void)
759 {
760 if (port_collect_total == 0 && port_list_head == NULL)
761 port_collect_listening = 1;
763 return (0);
764 } /* int conn_init */
766 static int conn_read (void)
767 {
768 int status;
770 conn_reset_port_entry ();
772 if (linux_source == SRC_NETLINK)
773 {
774 status = conn_read_netlink ();
775 }
776 else if (linux_source == SRC_PROC)
777 {
778 int errors_num = 0;
780 if (conn_read_file ("/proc/net/tcp") != 0)
781 errors_num++;
782 if (conn_read_file ("/proc/net/tcp6") != 0)
783 errors_num++;
785 if (errors_num < 2)
786 status = 0;
787 else
788 status = ENOENT;
789 }
790 else /* if (linux_source == SRC_DUNNO) */
791 {
792 /* Try to use netlink for getting this data, it is _much_ faster on systems
793 * with a large amount of connections. */
794 status = conn_read_netlink ();
795 if (status == 0)
796 {
797 INFO ("tcpconns plugin: Reading from netlink succeeded. "
798 "Will use the netlink method from now on.");
799 linux_source = SRC_NETLINK;
800 }
801 else
802 {
803 INFO ("tcpconns plugin: Reading from netlink failed. "
804 "Will read from /proc from now on.");
805 linux_source = SRC_PROC;
807 /* return success here to avoid the "plugin failed" message. */
808 return (0);
809 }
810 }
812 if (status == 0)
813 conn_submit_all ();
814 else
815 return (status);
817 return (0);
818 } /* int conn_read */
819 /* #endif KERNEL_LINUX */
821 #elif HAVE_SYSCTLBYNAME
822 static int conn_read (void)
823 {
824 int status;
825 char *buffer;
826 size_t buffer_len;;
828 struct xinpgen *in_orig;
829 struct xinpgen *in_ptr;
831 conn_reset_port_entry ();
833 buffer_len = 0;
834 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
835 if (status < 0)
836 {
837 ERROR ("tcpconns plugin: sysctlbyname failed.");
838 return (-1);
839 }
841 buffer = (char *) malloc (buffer_len);
842 if (buffer == NULL)
843 {
844 ERROR ("tcpconns plugin: malloc failed.");
845 return (-1);
846 }
848 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
849 if (status < 0)
850 {
851 ERROR ("tcpconns plugin: sysctlbyname failed.");
852 sfree (buffer);
853 return (-1);
854 }
856 if (buffer_len <= sizeof (struct xinpgen))
857 {
858 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
859 sfree (buffer);
860 return (-1);
861 }
863 in_orig = (struct xinpgen *) buffer;
864 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
865 in_ptr->xig_len > sizeof (struct xinpgen);
866 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
867 {
868 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
869 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
870 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
872 /* Ignore non-TCP sockets */
873 if (so->xso_protocol != IPPROTO_TCP)
874 continue;
876 /* Ignore PCBs which were freed during copyout. */
877 if (inp->inp_gencnt > in_orig->xig_gen)
878 continue;
880 if (((inp->inp_vflag & INP_IPV4) == 0)
881 && ((inp->inp_vflag & INP_IPV6) == 0))
882 continue;
884 conn_handle_ports (ntohs (inp->inp_lport), ntohs (inp->inp_fport),
885 tp->t_state);
886 } /* for (in_ptr) */
888 in_orig = NULL;
889 in_ptr = NULL;
890 sfree (buffer);
892 conn_submit_all ();
894 return (0);
895 } /* int conn_read */
896 /* #endif HAVE_SYSCTLBYNAME */
898 #elif HAVE_LIBKVM_NLIST
899 static int kread (u_long addr, void *buf, int size)
900 {
901 int status;
903 status = kvm_read (kvmd, addr, buf, size);
904 if (status != size)
905 {
906 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
907 status, size, kvm_geterr (kvmd));
908 return (-1);
909 }
910 return (0);
911 } /* int kread */
913 static int conn_init (void)
914 {
915 char buf[_POSIX2_LINE_MAX];
916 struct nlist nl[] =
917 {
918 #define N_TCBTABLE 0
919 { "_tcbtable" },
920 { "" }
921 };
922 int status;
924 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
925 if (kvmd == NULL)
926 {
927 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
928 return (-1);
929 }
931 status = kvm_nlist (kvmd, nl);
932 if (status < 0)
933 {
934 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
935 return (-1);
936 }
938 if (nl[N_TCBTABLE].n_type == 0)
939 {
940 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
941 "N_TCBTABLE is invalid.");
942 return (-1);
943 }
945 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
946 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
948 return (0);
949 } /* int conn_init */
951 static int conn_read (void)
952 {
953 struct inpcbtable table;
954 #if !defined(__OpenBSD__) && (defined(__NetBSD_Version__) && __NetBSD_Version__ <= 699002700)
955 struct inpcb *head;
956 #endif
957 struct inpcb *next;
958 struct inpcb inpcb;
959 struct tcpcb tcpcb;
960 int status;
962 conn_reset_port_entry ();
964 /* Read the pcbtable from the kernel */
965 status = kread (inpcbtable_off, &table, sizeof (table));
966 if (status != 0)
967 return (-1);
969 #if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
970 /* inpt_queue is a TAILQ on OpenBSD */
971 /* Get the first pcb */
972 next = (struct inpcb *)TAILQ_FIRST (&table.inpt_queue);
973 while (next)
974 #else
975 /* Get the `head' pcb */
976 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
977 /* Get the first pcb */
978 next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
980 while (next != head)
981 #endif
982 {
983 /* Read the pcb pointed to by `next' into `inpcb' */
984 kread ((u_long) next, &inpcb, sizeof (inpcb));
986 /* Advance `next' */
987 #if defined(__OpenBSD__) || (defined(__NetBSD_Version__) && __NetBSD_Version__ > 699002700)
988 /* inpt_queue is a TAILQ on OpenBSD */
989 next = (struct inpcb *)TAILQ_NEXT (&inpcb, inp_queue);
990 #else
991 next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
992 #endif
994 /* Ignore sockets, that are not connected. */
995 #ifdef __NetBSD__
996 if (inpcb.inp_af == AF_INET6)
997 continue; /* XXX see netbsd/src/usr.bin/netstat/inet6.c */
998 #else
999 if (!(inpcb.inp_flags & INP_IPV6)
1000 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
1001 continue;
1002 if ((inpcb.inp_flags & INP_IPV6)
1003 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
1004 continue;
1005 #endif
1007 kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
1008 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
1009 } /* while (next != head) */
1011 conn_submit_all ();
1013 return (0);
1014 }
1015 /* #endif HAVE_LIBKVM_NLIST */
1017 #elif KERNEL_AIX
1019 static int conn_read (void)
1020 {
1021 int size;
1022 int i;
1023 int nconn;
1024 void *data;
1025 struct netinfo_header *header;
1026 struct netinfo_conn *conn;
1028 conn_reset_port_entry ();
1030 size = netinfo(NETINFO_TCP, 0, 0, 0);
1031 if (size < 0)
1032 {
1033 ERROR ("tcpconns plugin: netinfo failed return: %i", size);
1034 return (-1);
1035 }
1037 if (size == 0)
1038 return (0);
1040 if ((size - sizeof (struct netinfo_header)) % sizeof (struct netinfo_conn))
1041 {
1042 ERROR ("tcpconns plugin: invalid buffer size");
1043 return (-1);
1044 }
1046 data = malloc(size);
1047 if (data == NULL)
1048 {
1049 ERROR ("tcpconns plugin: malloc failed");
1050 return (-1);
1051 }
1053 if (netinfo(NETINFO_TCP, data, &size, 0) < 0)
1054 {
1055 ERROR ("tcpconns plugin: netinfo failed");
1056 free(data);
1057 return (-1);
1058 }
1060 header = (struct netinfo_header *)data;
1061 nconn = header->size;
1062 conn = (struct netinfo_conn *)(data + sizeof(struct netinfo_header));
1064 for (i=0; i < nconn; conn++, i++)
1065 {
1066 conn_handle_ports (conn->srcport, conn->dstport, conn->tcp_state);
1067 }
1069 free(data);
1071 conn_submit_all ();
1073 return (0);
1074 }
1075 #endif /* KERNEL_AIX */
1077 void module_register (void)
1078 {
1079 plugin_register_config ("tcpconns", conn_config,
1080 config_keys, config_keys_num);
1081 #if KERNEL_LINUX
1082 plugin_register_init ("tcpconns", conn_init);
1083 #elif HAVE_SYSCTLBYNAME
1084 /* no initialization */
1085 #elif HAVE_LIBKVM_NLIST
1086 plugin_register_init ("tcpconns", conn_init);
1087 #elif KERNEL_AIX
1088 /* no initialization */
1089 #endif
1090 plugin_register_read ("tcpconns", conn_read);
1091 } /* void module_register */
1093 /*
1094 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :
1095 */