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 #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_RCVD",
223 "ESTABLISHED",
224 "CLOSE_WAIT",
225 "FIN_WAIT_1",
226 "CLOSING",
227 "LAST_ACK",
228 "FIN_WAIT_2",
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 };
277 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
279 static int port_collect_listening = 0;
280 static port_entry_t *port_list_head = NULL;
282 #if KERNEL_LINUX
283 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
284 /* This depends on linux inet_diag_req because if this structure is missing,
285 * sequence_number is useless and we get a compilation warning.
286 */
287 static uint32_t sequence_number = 0;
288 #endif
290 enum
291 {
292 SRC_DUNNO,
293 SRC_NETLINK,
294 SRC_PROC
295 } linux_source = SRC_DUNNO;
296 #endif
298 static void conn_submit_port_entry (port_entry_t *pe)
299 {
300 value_t values[1];
301 value_list_t vl = VALUE_LIST_INIT;
302 int i;
304 vl.values = values;
305 vl.values_len = 1;
306 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
307 sstrncpy (vl.plugin, "tcpconns", sizeof (vl.plugin));
308 sstrncpy (vl.type, "tcp_connections", sizeof (vl.type));
310 if (((port_collect_listening != 0) && (pe->flags & PORT_IS_LISTENING))
311 || (pe->flags & PORT_COLLECT_LOCAL))
312 {
313 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
314 "%"PRIu16"-local", pe->port);
316 for (i = 1; i <= TCP_STATE_MAX; i++)
317 {
318 vl.values[0].gauge = pe->count_local[i];
320 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
322 plugin_dispatch_values (&vl);
323 }
324 }
326 if (pe->flags & PORT_COLLECT_REMOTE)
327 {
328 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
329 "%"PRIu16"-remote", pe->port);
331 for (i = 1; i <= TCP_STATE_MAX; i++)
332 {
333 vl.values[0].gauge = pe->count_remote[i];
335 sstrncpy (vl.type_instance, tcp_state[i], sizeof (vl.type_instance));
337 plugin_dispatch_values (&vl);
338 }
339 }
340 } /* void conn_submit */
342 static void conn_submit_all (void)
343 {
344 port_entry_t *pe;
346 for (pe = port_list_head; pe != NULL; pe = pe->next)
347 conn_submit_port_entry (pe);
348 } /* void conn_submit_all */
350 static port_entry_t *conn_get_port_entry (uint16_t port, int create)
351 {
352 port_entry_t *ret;
354 ret = port_list_head;
355 while (ret != NULL)
356 {
357 if (ret->port == port)
358 break;
359 ret = ret->next;
360 }
362 if ((ret == NULL) && (create != 0))
363 {
364 ret = (port_entry_t *) malloc (sizeof (port_entry_t));
365 if (ret == NULL)
366 return (NULL);
367 memset (ret, '\0', sizeof (port_entry_t));
369 ret->port = port;
370 ret->next = port_list_head;
371 port_list_head = ret;
372 }
374 return (ret);
375 } /* port_entry_t *conn_get_port_entry */
377 /* Removes ports that were added automatically due to the `ListeningPorts'
378 * setting but which are no longer listening. */
379 static void conn_reset_port_entry (void)
380 {
381 port_entry_t *prev = NULL;
382 port_entry_t *pe = port_list_head;
384 while (pe != NULL)
385 {
386 /* If this entry was created while reading the files (ant not when handling
387 * the configuration) remove it now. */
388 if ((pe->flags & (PORT_COLLECT_LOCAL
389 | PORT_COLLECT_REMOTE
390 | PORT_IS_LISTENING)) == 0)
391 {
392 port_entry_t *next = pe->next;
394 DEBUG ("tcpconns plugin: Removing temporary entry "
395 "for listening port %"PRIu16, pe->port);
397 if (prev == NULL)
398 port_list_head = next;
399 else
400 prev->next = next;
402 sfree (pe);
403 pe = next;
405 continue;
406 }
408 memset (pe->count_local, '\0', sizeof (pe->count_local));
409 memset (pe->count_remote, '\0', sizeof (pe->count_remote));
410 pe->flags &= ~PORT_IS_LISTENING;
412 pe = pe->next;
413 }
414 } /* void conn_reset_port_entry */
416 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
417 {
418 port_entry_t *pe = NULL;
420 if ((state > TCP_STATE_MAX)
421 #if TCP_STATE_MIN > 0
422 || (state < TCP_STATE_MIN)
423 #endif
424 )
425 {
426 NOTICE ("tcpconns plugin: Ignoring connection with "
427 "unknown state 0x%02"PRIx8".", state);
428 return (-1);
429 }
431 /* Listening sockets */
432 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
433 {
434 pe = conn_get_port_entry (port_local, 1 /* create */);
435 if (pe != NULL)
436 pe->flags |= PORT_IS_LISTENING;
437 }
439 DEBUG ("tcpconns plugin: Connection %"PRIu16" <-> %"PRIu16" (%s)",
440 port_local, port_remote, tcp_state[state]);
442 pe = conn_get_port_entry (port_local, 0 /* no create */);
443 if (pe != NULL)
444 pe->count_local[state]++;
446 pe = conn_get_port_entry (port_remote, 0 /* no create */);
447 if (pe != NULL)
448 pe->count_remote[state]++;
450 return (0);
451 } /* int conn_handle_ports */
453 #if KERNEL_LINUX
454 /* Returns zero on success, less than zero on socket error and greater than
455 * zero on other errors. */
456 static int conn_read_netlink (void)
457 {
458 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
459 int fd;
460 struct sockaddr_nl nladdr;
461 struct nlreq req;
462 struct msghdr msg;
463 struct iovec iov;
464 struct inet_diag_msg *r;
465 char buf[8192];
467 /* If this fails, it's likely a permission problem. We'll fall back to
468 * reading this information from files below. */
469 fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
470 if (fd < 0)
471 {
472 ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
473 "NETLINK_INET_DIAG) failed: %s",
474 sstrerror (errno, buf, sizeof (buf)));
475 return (-1);
476 }
478 memset(&nladdr, 0, sizeof(nladdr));
479 nladdr.nl_family = AF_NETLINK;
481 memset(&req, 0, sizeof(req));
482 req.nlh.nlmsg_len = sizeof(req);
483 req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
484 /* NLM_F_ROOT: return the complete table instead of a single entry.
485 * NLM_F_MATCH: return all entries matching criteria (not implemented)
486 * NLM_F_REQUEST: must be set on all request messages */
487 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
488 req.nlh.nlmsg_pid = 0;
489 /* The sequence_number is used to track our messages. Since netlink is not
490 * reliable, we don't want to end up with a corrupt or incomplete old
491 * message in case the system is/was out of memory. */
492 req.nlh.nlmsg_seq = ++sequence_number;
493 req.r.idiag_family = AF_INET;
494 req.r.idiag_states = 0xfff;
495 req.r.idiag_ext = 0;
497 memset(&iov, 0, sizeof(iov));
498 iov.iov_base = &req;
499 iov.iov_len = sizeof(req);
501 memset(&msg, 0, sizeof(msg));
502 msg.msg_name = (void*)&nladdr;
503 msg.msg_namelen = sizeof(nladdr);
504 msg.msg_iov = &iov;
505 msg.msg_iovlen = 1;
507 if (sendmsg (fd, &msg, 0) < 0)
508 {
509 ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
510 sstrerror (errno, buf, sizeof (buf)));
511 close (fd);
512 return (-1);
513 }
515 iov.iov_base = buf;
516 iov.iov_len = sizeof(buf);
518 while (1)
519 {
520 int status;
521 struct nlmsghdr *h;
523 memset(&msg, 0, sizeof(msg));
524 msg.msg_name = (void*)&nladdr;
525 msg.msg_namelen = sizeof(nladdr);
526 msg.msg_iov = &iov;
527 msg.msg_iovlen = 1;
529 status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
530 if (status < 0)
531 {
532 if ((errno == EINTR) || (errno == EAGAIN))
533 continue;
535 ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
536 sstrerror (errno, buf, sizeof (buf)));
537 close (fd);
538 return (-1);
539 }
540 else if (status == 0)
541 {
542 close (fd);
543 DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
544 "reply from netlink socket.");
545 return (0);
546 }
548 h = (struct nlmsghdr*)buf;
549 while (NLMSG_OK(h, status))
550 {
551 if (h->nlmsg_seq != sequence_number)
552 {
553 h = NLMSG_NEXT(h, status);
554 continue;
555 }
557 if (h->nlmsg_type == NLMSG_DONE)
558 {
559 close (fd);
560 return (0);
561 }
562 else if (h->nlmsg_type == NLMSG_ERROR)
563 {
564 struct nlmsgerr *msg_error;
566 msg_error = NLMSG_DATA(h);
567 WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
568 msg_error->error);
570 close (fd);
571 return (1);
572 }
574 r = NLMSG_DATA(h);
576 /* This code does not (need to) distinguish between IPv4 and IPv6. */
577 conn_handle_ports (ntohs(r->id.idiag_sport),
578 ntohs(r->id.idiag_dport),
579 r->idiag_state);
581 h = NLMSG_NEXT(h, status);
582 } /* while (NLMSG_OK) */
583 } /* while (1) */
585 /* Not reached because the while() loop above handles the exit condition. */
586 return (0);
587 #else
588 return (1);
589 #endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
590 } /* int conn_read_netlink */
592 static int conn_handle_line (char *buffer)
593 {
594 char *fields[32];
595 int fields_len;
597 char *endptr;
599 char *port_local_str;
600 char *port_remote_str;
601 uint16_t port_local;
602 uint16_t port_remote;
604 uint8_t state;
606 int buffer_len = strlen (buffer);
608 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
609 buffer[--buffer_len] = '\0';
610 if (buffer_len <= 0)
611 return (-1);
613 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
614 if (fields_len < 12)
615 {
616 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
617 return (-1);
618 }
620 port_local_str = strchr (fields[1], ':');
621 port_remote_str = strchr (fields[2], ':');
623 if ((port_local_str == NULL) || (port_remote_str == NULL))
624 return (-1);
625 port_local_str++;
626 port_remote_str++;
627 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
628 return (-1);
630 endptr = NULL;
631 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
632 if ((endptr == NULL) || (*endptr != '\0'))
633 return (-1);
635 endptr = NULL;
636 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
637 if ((endptr == NULL) || (*endptr != '\0'))
638 return (-1);
640 endptr = NULL;
641 state = (uint8_t) strtol (fields[3], &endptr, 16);
642 if ((endptr == NULL) || (*endptr != '\0'))
643 return (-1);
645 return (conn_handle_ports (port_local, port_remote, state));
646 } /* int conn_handle_line */
648 static int conn_read_file (const char *file)
649 {
650 FILE *fh;
651 char buffer[1024];
653 fh = fopen (file, "r");
654 if (fh == NULL)
655 return (-1);
657 while (fgets (buffer, sizeof (buffer), fh) != NULL)
658 {
659 conn_handle_line (buffer);
660 } /* while (fgets) */
662 fclose (fh);
664 return (0);
665 } /* int conn_read_file */
666 /* #endif KERNEL_LINUX */
668 #elif HAVE_SYSCTLBYNAME
669 /* #endif HAVE_SYSCTLBYNAME */
671 #elif HAVE_LIBKVM_NLIST
672 #endif /* HAVE_LIBKVM_NLIST */
674 static int conn_config (const char *key, const char *value)
675 {
676 if (strcasecmp (key, "ListeningPorts") == 0)
677 {
678 if (IS_TRUE (value))
679 port_collect_listening = 1;
680 else
681 port_collect_listening = 0;
682 }
683 else if ((strcasecmp (key, "LocalPort") == 0)
684 || (strcasecmp (key, "RemotePort") == 0))
685 {
686 port_entry_t *pe;
687 int port = atoi (value);
689 if ((port < 1) || (port > 65535))
690 {
691 ERROR ("tcpconns plugin: Invalid port: %i", port);
692 return (1);
693 }
695 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
696 if (pe == NULL)
697 {
698 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
699 return (1);
700 }
702 if (strcasecmp (key, "LocalPort") == 0)
703 pe->flags |= PORT_COLLECT_LOCAL;
704 else
705 pe->flags |= PORT_COLLECT_REMOTE;
706 }
707 else
708 {
709 return (-1);
710 }
712 return (0);
713 } /* int conn_config */
715 #if KERNEL_LINUX
716 static int conn_init (void)
717 {
718 if (port_list_head == NULL)
719 port_collect_listening = 1;
721 return (0);
722 } /* int conn_init */
724 static int conn_read (void)
725 {
726 int status;
728 conn_reset_port_entry ();
730 if (linux_source == SRC_NETLINK)
731 {
732 status = conn_read_netlink ();
733 }
734 else if (linux_source == SRC_PROC)
735 {
736 int errors_num = 0;
738 if (conn_read_file ("/proc/net/tcp") != 0)
739 errors_num++;
740 if (conn_read_file ("/proc/net/tcp6") != 0)
741 errors_num++;
743 if (errors_num < 2)
744 status = 0;
745 else
746 status = ENOENT;
747 }
748 else /* if (linux_source == SRC_DUNNO) */
749 {
750 /* Try to use netlink for getting this data, it is _much_ faster on systems
751 * with a large amount of connections. */
752 status = conn_read_netlink ();
753 if (status == 0)
754 {
755 INFO ("tcpconns plugin: Reading from netlink succeeded. "
756 "Will use the netlink method from now on.");
757 linux_source = SRC_NETLINK;
758 }
759 else
760 {
761 INFO ("tcpconns plugin: Reading from netlink failed. "
762 "Will read from /proc from now on.");
763 linux_source = SRC_PROC;
765 /* return success here to avoid the "plugin failed" message. */
766 return (0);
767 }
768 }
770 if (status == 0)
771 conn_submit_all ();
772 else
773 return (status);
775 return (0);
776 } /* int conn_read */
777 /* #endif KERNEL_LINUX */
779 #elif HAVE_SYSCTLBYNAME
780 static int conn_read (void)
781 {
782 int status;
783 char *buffer;
784 size_t buffer_len;;
786 struct xinpgen *in_orig;
787 struct xinpgen *in_ptr;
789 conn_reset_port_entry ();
791 buffer_len = 0;
792 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
793 if (status < 0)
794 {
795 ERROR ("tcpconns plugin: sysctlbyname failed.");
796 return (-1);
797 }
799 buffer = (char *) malloc (buffer_len);
800 if (buffer == NULL)
801 {
802 ERROR ("tcpconns plugin: malloc failed.");
803 return (-1);
804 }
806 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
807 if (status < 0)
808 {
809 ERROR ("tcpconns plugin: sysctlbyname failed.");
810 sfree (buffer);
811 return (-1);
812 }
814 if (buffer_len <= sizeof (struct xinpgen))
815 {
816 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
817 sfree (buffer);
818 return (-1);
819 }
821 in_orig = (struct xinpgen *) buffer;
822 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
823 in_ptr->xig_len > sizeof (struct xinpgen);
824 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
825 {
826 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
827 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
828 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
830 /* Ignore non-TCP sockets */
831 if (so->xso_protocol != IPPROTO_TCP)
832 continue;
834 /* Ignore PCBs which were freed during copyout. */
835 if (inp->inp_gencnt > in_orig->xig_gen)
836 continue;
838 if (((inp->inp_vflag & INP_IPV4) == 0)
839 && ((inp->inp_vflag & INP_IPV6) == 0))
840 continue;
842 conn_handle_ports (ntohs (inp->inp_lport), ntohs (inp->inp_fport),
843 tp->t_state);
844 } /* for (in_ptr) */
846 in_orig = NULL;
847 in_ptr = NULL;
848 sfree (buffer);
850 conn_submit_all ();
852 return (0);
853 } /* int conn_read */
854 /* #endif HAVE_SYSCTLBYNAME */
856 #elif HAVE_LIBKVM_NLIST
857 static int kread (u_long addr, void *buf, int size)
858 {
859 int status;
861 status = kvm_read (kvmd, addr, buf, size);
862 if (status != size)
863 {
864 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
865 status, size, kvm_geterr (kvmd));
866 return (-1);
867 }
868 return (0);
869 } /* int kread */
871 static int conn_init (void)
872 {
873 char buf[_POSIX2_LINE_MAX];
874 struct nlist nl[] =
875 {
876 #define N_TCBTABLE 0
877 { "_tcbtable" },
878 { "" }
879 };
880 int status;
882 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
883 if (kvmd == NULL)
884 {
885 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
886 return (-1);
887 }
889 status = kvm_nlist (kvmd, nl);
890 if (status < 0)
891 {
892 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
893 return (-1);
894 }
896 if (nl[N_TCBTABLE].n_type == 0)
897 {
898 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
899 "N_TCBTABLE is invalid.");
900 return (-1);
901 }
903 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
904 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
906 return (0);
907 } /* int conn_init */
909 static int conn_read (void)
910 {
911 struct inpcbtable table;
912 struct inpcb *head;
913 struct inpcb *next;
914 struct inpcb inpcb;
915 struct tcpcb tcpcb;
916 int status;
918 conn_reset_port_entry ();
920 /* Read the pcbtable from the kernel */
921 status = kread (inpcbtable_off, &table, sizeof (table));
922 if (status != 0)
923 return (-1);
925 /* Get the `head' pcb */
926 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
927 /* Get the first pcb */
928 next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
930 while (next != head)
931 {
932 /* Read the pcb pointed to by `next' into `inpcb' */
933 kread ((u_long) next, &inpcb, sizeof (inpcb));
935 /* Advance `next' */
936 next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
938 /* Ignore sockets, that are not connected. */
939 #ifdef __NetBSD__
940 if (inpcb.inp_af == AF_INET6)
941 continue; /* XXX see netbsd/src/usr.bin/netstat/inet6.c */
942 #else
943 if (!(inpcb.inp_flags & INP_IPV6)
944 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
945 continue;
946 if ((inpcb.inp_flags & INP_IPV6)
947 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
948 continue;
949 #endif
951 kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
952 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
953 } /* while (next != head) */
955 conn_submit_all ();
957 return (0);
958 }
959 /* #endif HAVE_LIBKVM_NLIST */
961 #elif KERNEL_AIX
963 static int conn_read (void)
964 {
965 int size;
966 int i;
967 int nconn;
968 void *data;
969 struct netinfo_header *header;
970 struct netinfo_conn *conn;
972 conn_reset_port_entry ();
974 size = netinfo(NETINFO_TCP, 0, 0, 0);
975 if (size < 0)
976 {
977 ERROR ("tcpconns plugin: netinfo failed return: %i", size);
978 return (-1);
979 }
981 if (size == 0)
982 return (0);
984 if ((size - sizeof (struct netinfo_header)) % sizeof (struct netinfo_conn))
985 {
986 ERROR ("tcpconns plugin: invalid buffer size");
987 return (-1);
988 }
990 data = malloc(size);
991 if (data == NULL)
992 {
993 ERROR ("tcpconns plugin: malloc failed");
994 return (-1);
995 }
997 if (netinfo(NETINFO_TCP, data, &size, 0) < 0)
998 {
999 ERROR ("tcpconns plugin: netinfo failed");
1000 free(data);
1001 return (-1);
1002 }
1004 header = (struct netinfo_header *)data;
1005 nconn = header->size;
1006 conn = (struct netinfo_conn *)(data + sizeof(struct netinfo_header));
1008 for (i=0; i < nconn; conn++, i++)
1009 {
1010 conn_handle_ports (conn->srcport, conn->dstport, conn->tcp_state);
1011 }
1013 free(data);
1015 conn_submit_all ();
1017 return (0);
1018 }
1019 #endif /* KERNEL_AIX */
1021 void module_register (void)
1022 {
1023 plugin_register_config ("tcpconns", conn_config,
1024 config_keys, config_keys_num);
1025 #if KERNEL_LINUX
1026 plugin_register_init ("tcpconns", conn_init);
1027 #elif HAVE_SYSCTLBYNAME
1028 /* no initialization */
1029 #elif HAVE_LIBKVM_NLIST
1030 plugin_register_init ("tcpconns", conn_init);
1031 #elif KERNEL_AIX
1032 /* no initialization */
1033 #endif
1034 plugin_register_read ("tcpconns", conn_read);
1035 } /* void module_register */
1037 /*
1038 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :
1039 */