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 verplant.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 # include <linux/inet_diag.h>
78 # include <sys/socket.h>
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_SYS_SOCKET_H
92 # include <sys/socket.h>
93 #endif
94 #if HAVE_NET_IF_H
95 # include <net/if.h>
96 #endif
98 # include <net/route.h>
99 # include <netinet/in.h>
100 # include <netinet/in_systm.h>
101 # include <netinet/ip.h>
102 # include <netinet/ip6.h>
103 # include <netinet/in_pcb.h>
104 # include <netinet/ip_var.h>
105 # include <netinet/tcp.h>
106 # include <netinet/tcpip.h>
107 # include <netinet/tcp_seq.h>
108 # include <netinet/tcp_var.h>
109 /* #endif HAVE_SYSCTLBYNAME */
111 /* This is for OpenBSD and NetBSD. */
112 #elif HAVE_LIBKVM_NLIST
113 # include <sys/queue.h>
114 # include <sys/socket.h>
115 # include <net/route.h>
116 # include <netinet/in.h>
117 # include <netinet/in_systm.h>
118 # include <netinet/ip.h>
119 # include <netinet/ip_var.h>
120 # include <netinet/in_pcb.h>
121 # include <netinet/tcp.h>
122 # include <netinet/tcp_timer.h>
123 # include <netinet/tcp_var.h>
124 # include <netdb.h>
125 # include <arpa/inet.h>
126 # if !defined(HAVE_BSD_NLIST_H) || !HAVE_BSD_NLIST_H
127 # include <nlist.h>
128 # else /* HAVE_BSD_NLIST_H */
129 # include <bsd/nlist.h>
130 # endif
131 # include <kvm.h>
132 /* #endif HAVE_LIBKVM_NLIST */
134 #elif KERNEL_AIX
135 # include <arpa/inet.h>
136 # include <sys/socketvar.h>
137 #endif /* KERNEL_AIX */
139 #if KERNEL_LINUX
140 struct nlreq {
141 struct nlmsghdr nlh;
142 struct inet_diag_req r;
143 };
145 static const char *tcp_state[] =
146 {
147 "", /* 0 */
148 "ESTABLISHED",
149 "SYN_SENT",
150 "SYN_RECV",
151 "FIN_WAIT1",
152 "FIN_WAIT2",
153 "TIME_WAIT",
154 "CLOSED",
155 "CLOSE_WAIT",
156 "LAST_ACK",
157 "LISTEN", /* 10 */
158 "CLOSING"
159 };
161 # define TCP_STATE_LISTEN 10
162 # define TCP_STATE_MIN 1
163 # define TCP_STATE_MAX 11
164 /* #endif KERNEL_LINUX */
166 #elif HAVE_SYSCTLBYNAME
167 static const char *tcp_state[] =
168 {
169 "CLOSED",
170 "LISTEN",
171 "SYN_SENT",
172 "SYN_RECV",
173 "ESTABLISHED",
174 "CLOSE_WAIT",
175 "FIN_WAIT1",
176 "CLOSING",
177 "LAST_ACK",
178 "FIN_WAIT2",
179 "TIME_WAIT"
180 };
182 # define TCP_STATE_LISTEN 1
183 # define TCP_STATE_MIN 0
184 # define TCP_STATE_MAX 10
185 /* #endif HAVE_SYSCTLBYNAME */
187 #elif HAVE_LIBKVM_NLIST
188 static const char *tcp_state[] =
189 {
190 "CLOSED",
191 "LISTEN",
192 "SYN_SENT",
193 "SYN_RECV",
194 "ESTABLISHED",
195 "CLOSE_WAIT",
196 "FIN_WAIT1",
197 "CLOSING",
198 "LAST_ACK",
199 "FIN_WAIT2",
200 "TIME_WAIT"
201 };
203 static kvm_t *kvmd;
204 static u_long inpcbtable_off = 0;
205 struct inpcbtable *inpcbtable_ptr = NULL;
207 # define TCP_STATE_LISTEN 1
208 # define TCP_STATE_MIN 1
209 # define TCP_STATE_MAX 10
210 /* #endif HAVE_LIBKVM_NLIST */
212 #elif KERNEL_AIX
213 static const char *tcp_state[] =
214 {
215 "CLOSED",
216 "LISTEN",
217 "SYN_SENT",
218 "SYN_RCVD",
219 "ESTABLISHED",
220 "CLOSE_WAIT",
221 "FIN_WAIT_1",
222 "CLOSING",
223 "LAST_ACK",
224 "FIN_WAIT_2",
225 "TIME_WAIT"
226 };
228 # define TCP_STATE_LISTEN 1
229 # define TCP_STATE_MIN 0
230 # define TCP_STATE_MAX 10
232 struct netinfo_conn {
233 uint32_t unknow1[2];
234 uint16_t dstport;
235 uint16_t unknow2;
236 struct in6_addr dstaddr;
237 uint16_t srcport;
238 uint16_t unknow3;
239 struct in6_addr srcaddr;
240 uint32_t unknow4[36];
241 uint16_t tcp_state;
242 uint16_t unknow5[7];
243 };
245 struct netinfo_header {
246 unsigned int proto;
247 unsigned int size;
248 };
250 # define NETINFO_TCP 3
251 extern int netinfo (int proto, void *data, int *size, int n);
252 #endif /* KERNEL_AIX */
254 #define PORT_COLLECT_LOCAL 0x01
255 #define PORT_COLLECT_REMOTE 0x02
256 #define PORT_IS_LISTENING 0x04
258 typedef struct port_entry_s
259 {
260 uint16_t port;
261 uint16_t flags;
262 uint32_t count_local[TCP_STATE_MAX + 1];
263 uint32_t count_remote[TCP_STATE_MAX + 1];
264 struct port_entry_s *next;
265 } port_entry_t;
267 static const char *config_keys[] =
268 {
269 "ListeningPorts",
270 "LocalPort",
271 "RemotePort"
272 };
273 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
275 static int port_collect_listening = 0;
276 static port_entry_t *port_list_head = NULL;
278 #if KERNEL_LINUX
279 static uint32_t sequence_number = 0;
281 enum
282 {
283 SRC_DUNNO,
284 SRC_NETLINK,
285 SRC_PROC
286 } linux_source = SRC_DUNNO;
287 #endif
289 static void conn_submit_port_entry (port_entry_t *pe)
290 {
291 value_t values[1];
292 value_list_t vl = VALUE_LIST_INIT;
293 int i;
295 vl.values = values;
296 vl.values_len = 1;
297 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
298 sstrncpy (vl.plugin, "tcpconns", sizeof (vl.plugin));
299 sstrncpy (vl.type, "tcp_connections", sizeof (vl.type));
301 if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
302 || (pe->flags & PORT_COLLECT_LOCAL))
303 {
304 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
305 "%"PRIu16"-local", pe->port);
307 for (i = 1; i <= TCP_STATE_MAX; i++)
308 {
309 vl.values[0].gauge = pe->count_local[i];
311 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
313 plugin_dispatch_values (&vl);
314 }
315 }
317 if (pe->flags & PORT_COLLECT_REMOTE)
318 {
319 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
320 "%"PRIu16"-remote", pe->port);
322 for (i = 1; i <= TCP_STATE_MAX; i++)
323 {
324 vl.values[0].gauge = pe->count_remote[i];
326 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
328 plugin_dispatch_values (&vl);
329 }
330 }
331 } /* void conn_submit */
333 static void conn_submit_all (void)
334 {
335 port_entry_t *pe;
337 for (pe = port_list_head; pe != NULL; pe = pe->next)
338 conn_submit_port_entry (pe);
339 } /* void conn_submit_all */
341 static port_entry_t *conn_get_port_entry (uint16_t port, int create)
342 {
343 port_entry_t *ret;
345 ret = port_list_head;
346 while (ret != NULL)
347 {
348 if (ret->port == port)
349 break;
350 ret = ret->next;
351 }
353 if ((ret == NULL) && (create != 0))
354 {
355 ret = (port_entry_t *) malloc (sizeof (port_entry_t));
356 if (ret == NULL)
357 return (NULL);
358 memset (ret, '\0', sizeof (port_entry_t));
360 ret->port = port;
361 ret->next = port_list_head;
362 port_list_head = ret;
363 }
365 return (ret);
366 } /* port_entry_t *conn_get_port_entry */
368 /* Removes ports that were added automatically due to the `ListeningPorts'
369 * setting but which are no longer listening. */
370 static void conn_reset_port_entry (void)
371 {
372 port_entry_t *prev = NULL;
373 port_entry_t *pe = port_list_head;
375 while (pe != NULL)
376 {
377 /* If this entry was created while reading the files (ant not when handling
378 * the configuration) remove it now. */
379 if ((pe->flags & (PORT_COLLECT_LOCAL
380 | PORT_COLLECT_REMOTE
381 | PORT_IS_LISTENING)) == 0)
382 {
383 port_entry_t *next = pe->next;
385 DEBUG ("tcpconns plugin: Removing temporary entry "
386 "for listening port %"PRIu16, pe->port);
388 if (prev == NULL)
389 port_list_head = next;
390 else
391 prev->next = next;
393 sfree (pe);
394 pe = next;
396 continue;
397 }
399 memset (pe->count_local, '\0', sizeof (pe->count_local));
400 memset (pe->count_remote, '\0', sizeof (pe->count_remote));
401 pe->flags &= ~PORT_IS_LISTENING;
403 pe = pe->next;
404 }
405 } /* void conn_reset_port_entry */
407 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
408 {
409 port_entry_t *pe = NULL;
411 if ((state > TCP_STATE_MAX)
412 #if TCP_STATE_MIN > 0
413 || (state < TCP_STATE_MIN)
414 #endif
415 )
416 {
417 NOTICE ("tcpconns plugin: Ignoring connection with "
418 "unknown state 0x%02"PRIx8".", state);
419 return (-1);
420 }
422 /* Listening sockets */
423 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
424 {
425 pe = conn_get_port_entry (port_local, 1 /* create */);
426 if (pe != NULL)
427 pe->flags |= PORT_IS_LISTENING;
428 }
430 DEBUG ("tcpconns plugin: Connection %"PRIu16" <-> %"PRIu16" (%s)",
431 port_local, port_remote, tcp_state[state]);
433 pe = conn_get_port_entry (port_local, 0 /* no create */);
434 if (pe != NULL)
435 pe->count_local[state]++;
437 pe = conn_get_port_entry (port_remote, 0 /* no create */);
438 if (pe != NULL)
439 pe->count_remote[state]++;
441 return (0);
442 } /* int conn_handle_ports */
444 #if KERNEL_LINUX
445 /* Returns zero on success, less than zero on socket error and greater than
446 * zero on other errors. */
447 static int conn_read_netlink (void)
448 {
449 int fd;
450 struct sockaddr_nl nladdr;
451 struct nlreq req;
452 struct msghdr msg;
453 struct iovec iov;
454 struct inet_diag_msg *r;
455 char buf[8192];
457 /* If this fails, it's likely a permission problem. We'll fall back to
458 * reading this information from files below. */
459 fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
460 if (fd < 0)
461 {
462 ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
463 "NETLINK_INET_DIAG) failed: %s",
464 sstrerror (errno, buf, sizeof (buf)));
465 return (-1);
466 }
468 memset(&nladdr, 0, sizeof(nladdr));
469 nladdr.nl_family = AF_NETLINK;
471 memset(&req, 0, sizeof(req));
472 req.nlh.nlmsg_len = sizeof(req);
473 req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
474 /* NLM_F_ROOT: return the complete table instead of a single entry.
475 * NLM_F_MATCH: return all entries matching criteria (not implemented)
476 * NLM_F_REQUEST: must be set on all request messages */
477 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
478 req.nlh.nlmsg_pid = 0;
479 /* The sequence_number is used to track our messages. Since netlink is not
480 * reliable, we don't want to end up with a corrupt or incomplete old
481 * message in case the system is/was out of memory. */
482 req.nlh.nlmsg_seq = ++sequence_number;
483 req.r.idiag_family = AF_INET;
484 req.r.idiag_states = 0xfff;
485 req.r.idiag_ext = 0;
487 memset(&iov, 0, sizeof(iov));
488 iov.iov_base = &req;
489 iov.iov_len = sizeof(req);
491 memset(&msg, 0, sizeof(msg));
492 msg.msg_name = (void*)&nladdr;
493 msg.msg_namelen = sizeof(nladdr);
494 msg.msg_iov = &iov;
495 msg.msg_iovlen = 1;
497 if (sendmsg (fd, &msg, 0) < 0)
498 {
499 ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
500 sstrerror (errno, buf, sizeof (buf)));
501 close (fd);
502 return (-1);
503 }
505 iov.iov_base = buf;
506 iov.iov_len = sizeof(buf);
508 while (1)
509 {
510 int status;
511 struct nlmsghdr *h;
513 memset(&msg, 0, sizeof(msg));
514 msg.msg_name = (void*)&nladdr;
515 msg.msg_namelen = sizeof(nladdr);
516 msg.msg_iov = &iov;
517 msg.msg_iovlen = 1;
519 status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
520 if (status < 0)
521 {
522 if ((errno == EINTR) || (errno == EAGAIN))
523 continue;
525 ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
526 sstrerror (errno, buf, sizeof (buf)));
527 close (fd);
528 return (-1);
529 }
530 else if (status == 0)
531 {
532 close (fd);
533 DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
534 "reply from netlink socket.");
535 return (0);
536 }
538 h = (struct nlmsghdr*)buf;
539 while (NLMSG_OK(h, status))
540 {
541 if (h->nlmsg_seq != sequence_number)
542 {
543 h = NLMSG_NEXT(h, status);
544 continue;
545 }
547 if (h->nlmsg_type == NLMSG_DONE)
548 {
549 close (fd);
550 return (0);
551 }
552 else if (h->nlmsg_type == NLMSG_ERROR)
553 {
554 struct nlmsgerr *msg_error;
556 msg_error = NLMSG_DATA(h);
557 WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
558 msg_error->error);
560 close (fd);
561 return (1);
562 }
564 r = NLMSG_DATA(h);
566 /* This code does not (need to) distinguish between IPv4 and IPv6. */
567 conn_handle_ports (ntohs(r->id.idiag_sport),
568 ntohs(r->id.idiag_dport),
569 r->idiag_state);
571 h = NLMSG_NEXT(h, status);
572 } /* while (NLMSG_OK) */
573 } /* while (1) */
575 /* Not reached because the while() loop above handles the exit condition. */
576 return (0);
577 } /* int conn_read_netlink */
579 static int conn_handle_line (char *buffer)
580 {
581 char *fields[32];
582 int fields_len;
584 char *endptr;
586 char *port_local_str;
587 char *port_remote_str;
588 uint16_t port_local;
589 uint16_t port_remote;
591 uint8_t state;
593 int buffer_len = strlen (buffer);
595 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
596 buffer[--buffer_len] = '\0';
597 if (buffer_len <= 0)
598 return (-1);
600 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
601 if (fields_len < 12)
602 {
603 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
604 return (-1);
605 }
607 port_local_str = strchr (fields[1], ':');
608 port_remote_str = strchr (fields[2], ':');
610 if ((port_local_str == NULL) || (port_remote_str == NULL))
611 return (-1);
612 port_local_str++;
613 port_remote_str++;
614 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
615 return (-1);
617 endptr = NULL;
618 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
619 if ((endptr == NULL) || (*endptr != '\0'))
620 return (-1);
622 endptr = NULL;
623 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
624 if ((endptr == NULL) || (*endptr != '\0'))
625 return (-1);
627 endptr = NULL;
628 state = (uint8_t) strtol (fields[3], &endptr, 16);
629 if ((endptr == NULL) || (*endptr != '\0'))
630 return (-1);
632 return (conn_handle_ports (port_local, port_remote, state));
633 } /* int conn_handle_line */
635 static int conn_read_file (const char *file)
636 {
637 FILE *fh;
638 char buffer[1024];
640 fh = fopen (file, "r");
641 if (fh == NULL)
642 return (-1);
644 while (fgets (buffer, sizeof (buffer), fh) != NULL)
645 {
646 conn_handle_line (buffer);
647 } /* while (fgets) */
649 fclose (fh);
651 return (0);
652 } /* int conn_read_file */
653 /* #endif KERNEL_LINUX */
655 #elif HAVE_SYSCTLBYNAME
656 /* #endif HAVE_SYSCTLBYNAME */
658 #elif HAVE_LIBKVM_NLIST
659 #endif /* HAVE_LIBKVM_NLIST */
661 static int conn_config (const char *key, const char *value)
662 {
663 if (strcasecmp (key, "ListeningPorts") == 0)
664 {
665 if (IS_TRUE (value))
666 port_collect_listening = 1;
667 else
668 port_collect_listening = 0;
669 }
670 else if ((strcasecmp (key, "LocalPort") == 0)
671 || (strcasecmp (key, "RemotePort") == 0))
672 {
673 port_entry_t *pe;
674 int port = atoi (value);
676 if ((port < 1) || (port > 65535))
677 {
678 ERROR ("tcpconns plugin: Invalid port: %i", port);
679 return (1);
680 }
682 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
683 if (pe == NULL)
684 {
685 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
686 return (1);
687 }
689 if (strcasecmp (key, "LocalPort") == 0)
690 pe->flags |= PORT_COLLECT_LOCAL;
691 else
692 pe->flags |= PORT_COLLECT_REMOTE;
693 }
694 else
695 {
696 return (-1);
697 }
699 return (0);
700 } /* int conn_config */
702 #if KERNEL_LINUX
703 static int conn_init (void)
704 {
705 if (port_list_head == NULL)
706 port_collect_listening = 1;
708 return (0);
709 } /* int conn_init */
711 static int conn_read (void)
712 {
713 int status;
715 conn_reset_port_entry ();
717 if (linux_source == SRC_NETLINK)
718 {
719 status = conn_read_netlink ();
720 }
721 else if (linux_source == SRC_PROC)
722 {
723 int errors_num = 0;
725 if (conn_read_file ("/proc/net/tcp") != 0)
726 errors_num++;
727 if (conn_read_file ("/proc/net/tcp6") != 0)
728 errors_num++;
730 if (errors_num < 2)
731 status = 0;
732 else
733 status = ENOENT;
734 }
735 else /* if (linux_source == SRC_DUNNO) */
736 {
737 /* Try to use netlink for getting this data, it is _much_ faster on systems
738 * with a large amount of connections. */
739 status = conn_read_netlink ();
740 if (status == 0)
741 {
742 INFO ("tcpconns plugin: Reading from netlink succeeded. "
743 "Will use the netlink method from now on.");
744 linux_source = SRC_NETLINK;
745 }
746 else
747 {
748 INFO ("tcpconns plugin: Reading from netlink failed. "
749 "Will read from /proc from now on.");
750 linux_source = SRC_PROC;
752 /* return success here to avoid the "plugin failed" message. */
753 return (0);
754 }
755 }
757 if (status == 0)
758 conn_submit_all ();
759 else
760 return (status);
762 return (0);
763 } /* int conn_read */
764 /* #endif KERNEL_LINUX */
766 #elif HAVE_SYSCTLBYNAME
767 static int conn_read (void)
768 {
769 int status;
770 char *buffer;
771 size_t buffer_len;;
773 struct xinpgen *in_orig;
774 struct xinpgen *in_ptr;
776 conn_reset_port_entry ();
778 buffer_len = 0;
779 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
780 if (status < 0)
781 {
782 ERROR ("tcpconns plugin: sysctlbyname failed.");
783 return (-1);
784 }
786 buffer = (char *) malloc (buffer_len);
787 if (buffer == NULL)
788 {
789 ERROR ("tcpconns plugin: malloc failed.");
790 return (-1);
791 }
793 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
794 if (status < 0)
795 {
796 ERROR ("tcpconns plugin: sysctlbyname failed.");
797 sfree (buffer);
798 return (-1);
799 }
801 if (buffer_len <= sizeof (struct xinpgen))
802 {
803 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
804 sfree (buffer);
805 return (-1);
806 }
808 in_orig = (struct xinpgen *) buffer;
809 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
810 in_ptr->xig_len > sizeof (struct xinpgen);
811 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
812 {
813 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
814 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
815 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
817 /* Ignore non-TCP sockets */
818 if (so->xso_protocol != IPPROTO_TCP)
819 continue;
821 /* Ignore PCBs which were freed during copyout. */
822 if (inp->inp_gencnt > in_orig->xig_gen)
823 continue;
825 if (((inp->inp_vflag & INP_IPV4) == 0)
826 && ((inp->inp_vflag & INP_IPV6) == 0))
827 continue;
829 conn_handle_ports (ntohs (inp->inp_lport), ntohs (inp->inp_fport),
830 tp->t_state);
831 } /* for (in_ptr) */
833 in_orig = NULL;
834 in_ptr = NULL;
835 sfree (buffer);
837 conn_submit_all ();
839 return (0);
840 } /* int conn_read */
841 /* #endif HAVE_SYSCTLBYNAME */
843 #elif HAVE_LIBKVM_NLIST
844 static int kread (u_long addr, void *buf, int size)
845 {
846 int status;
848 status = kvm_read (kvmd, addr, buf, size);
849 if (status != size)
850 {
851 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
852 status, size, kvm_geterr (kvmd));
853 return (-1);
854 }
855 return (0);
856 } /* int kread */
858 static int conn_init (void)
859 {
860 char buf[_POSIX2_LINE_MAX];
861 struct nlist nl[] =
862 {
863 #define N_TCBTABLE 0
864 { "_tcbtable" },
865 { "" }
866 };
867 int status;
869 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
870 if (kvmd == NULL)
871 {
872 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
873 return (-1);
874 }
876 status = kvm_nlist (kvmd, nl);
877 if (status < 0)
878 {
879 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
880 return (-1);
881 }
883 if (nl[N_TCBTABLE].n_type == 0)
884 {
885 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
886 "N_TCBTABLE is invalid.");
887 return (-1);
888 }
890 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
891 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
893 return (0);
894 } /* int conn_init */
896 static int conn_read (void)
897 {
898 struct inpcbtable table;
899 struct inpcb *head;
900 struct inpcb *next;
901 struct inpcb inpcb;
902 struct tcpcb tcpcb;
903 int status;
905 conn_reset_port_entry ();
907 /* Read the pcbtable from the kernel */
908 status = kread (inpcbtable_off, &table, sizeof (table));
909 if (status != 0)
910 return (-1);
912 /* Get the `head' pcb */
913 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
914 /* Get the first pcb */
915 next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
917 while (next != head)
918 {
919 /* Read the pcb pointed to by `next' into `inpcb' */
920 kread ((u_long) next, &inpcb, sizeof (inpcb));
922 /* Advance `next' */
923 next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
925 /* Ignore sockets, that are not connected. */
926 #ifdef __NetBSD__
927 if (inpcb.inp_af == AF_INET6)
928 continue; /* XXX see netbsd/src/usr.bin/netstat/inet6.c */
929 #else
930 if (!(inpcb.inp_flags & INP_IPV6)
931 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
932 continue;
933 if ((inpcb.inp_flags & INP_IPV6)
934 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
935 continue;
936 #endif
938 kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
939 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
940 } /* while (next != head) */
942 conn_submit_all ();
944 return (0);
945 }
946 /* #endif HAVE_LIBKVM_NLIST */
948 #elif KERNEL_AIX
950 static int conn_read (void)
951 {
952 int size;
953 int i;
954 int nconn;
955 void *data;
956 struct netinfo_header *header;
957 struct netinfo_conn *conn;
959 conn_reset_port_entry ();
961 size = netinfo(NETINFO_TCP, 0, 0, 0);
962 if (size < 0)
963 {
964 ERROR ("tcpconns plugin: netinfo failed return: %i", size);
965 return (-1);
966 }
968 if (size == 0)
969 return (0);
971 if ((size - sizeof (struct netinfo_header)) % sizeof (struct netinfo_conn))
972 {
973 ERROR ("tcpconns plugin: invalid buffer size");
974 return (-1);
975 }
977 data = malloc(size);
978 if (data == NULL)
979 {
980 ERROR ("tcpconns plugin: malloc failed");
981 return (-1);
982 }
984 if (netinfo(NETINFO_TCP, data, &size, 0) < 0)
985 {
986 ERROR ("tcpconns plugin: netinfo failed");
987 free(data);
988 return (-1);
989 }
991 header = (struct netinfo_header *)data;
992 nconn = header->size;
993 conn = (struct netinfo_conn *)(data + sizeof(struct netinfo_header));
995 for (i=0; i < nconn; conn++, i++)
996 {
997 conn_handle_ports (conn->srcport, conn->dstport, conn->tcp_state);
998 }
1000 free(data);
1002 conn_submit_all ();
1004 return (0);
1005 }
1006 #endif /* KERNEL_AIX */
1008 void module_register (void)
1009 {
1010 plugin_register_config ("tcpconns", conn_config,
1011 config_keys, config_keys_num);
1012 #if KERNEL_LINUX
1013 plugin_register_init ("tcpconns", conn_init);
1014 #elif HAVE_SYSCTLBYNAME
1015 /* no initialization */
1016 #elif HAVE_LIBKVM_NLIST
1017 plugin_register_init ("tcpconns", conn_init);
1018 #elif KERNEL_AIX
1019 /* no initialization */
1020 #endif
1021 plugin_register_read ("tcpconns", conn_read);
1022 } /* void module_register */
1024 /*
1025 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :
1026 */