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 prev = pe;
413 pe = pe->next;
414 }
415 } /* void conn_reset_port_entry */
417 static int conn_handle_ports (uint16_t port_local, uint16_t port_remote, uint8_t state)
418 {
419 port_entry_t *pe = NULL;
421 if ((state > TCP_STATE_MAX)
422 #if TCP_STATE_MIN > 0
423 || (state < TCP_STATE_MIN)
424 #endif
425 )
426 {
427 NOTICE ("tcpconns plugin: Ignoring connection with "
428 "unknown state 0x%02"PRIx8".", state);
429 return (-1);
430 }
432 /* Listening sockets */
433 if ((state == TCP_STATE_LISTEN) && (port_collect_listening != 0))
434 {
435 pe = conn_get_port_entry (port_local, 1 /* create */);
436 if (pe != NULL)
437 pe->flags |= PORT_IS_LISTENING;
438 }
440 DEBUG ("tcpconns plugin: Connection %"PRIu16" <-> %"PRIu16" (%s)",
441 port_local, port_remote, tcp_state[state]);
443 pe = conn_get_port_entry (port_local, 0 /* no create */);
444 if (pe != NULL)
445 pe->count_local[state]++;
447 pe = conn_get_port_entry (port_remote, 0 /* no create */);
448 if (pe != NULL)
449 pe->count_remote[state]++;
451 return (0);
452 } /* int conn_handle_ports */
454 #if KERNEL_LINUX
455 /* Returns zero on success, less than zero on socket error and greater than
456 * zero on other errors. */
457 static int conn_read_netlink (void)
458 {
459 #if HAVE_STRUCT_LINUX_INET_DIAG_REQ
460 int fd;
461 struct sockaddr_nl nladdr;
462 struct nlreq req;
463 struct msghdr msg;
464 struct iovec iov;
465 struct inet_diag_msg *r;
466 char buf[8192];
468 /* If this fails, it's likely a permission problem. We'll fall back to
469 * reading this information from files below. */
470 fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG);
471 if (fd < 0)
472 {
473 ERROR ("tcpconns plugin: conn_read_netlink: socket(AF_NETLINK, SOCK_RAW, "
474 "NETLINK_INET_DIAG) failed: %s",
475 sstrerror (errno, buf, sizeof (buf)));
476 return (-1);
477 }
479 memset(&nladdr, 0, sizeof(nladdr));
480 nladdr.nl_family = AF_NETLINK;
482 memset(&req, 0, sizeof(req));
483 req.nlh.nlmsg_len = sizeof(req);
484 req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
485 /* NLM_F_ROOT: return the complete table instead of a single entry.
486 * NLM_F_MATCH: return all entries matching criteria (not implemented)
487 * NLM_F_REQUEST: must be set on all request messages */
488 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
489 req.nlh.nlmsg_pid = 0;
490 /* The sequence_number is used to track our messages. Since netlink is not
491 * reliable, we don't want to end up with a corrupt or incomplete old
492 * message in case the system is/was out of memory. */
493 req.nlh.nlmsg_seq = ++sequence_number;
494 req.r.idiag_family = AF_INET;
495 req.r.idiag_states = 0xfff;
496 req.r.idiag_ext = 0;
498 memset(&iov, 0, sizeof(iov));
499 iov.iov_base = &req;
500 iov.iov_len = sizeof(req);
502 memset(&msg, 0, sizeof(msg));
503 msg.msg_name = (void*)&nladdr;
504 msg.msg_namelen = sizeof(nladdr);
505 msg.msg_iov = &iov;
506 msg.msg_iovlen = 1;
508 if (sendmsg (fd, &msg, 0) < 0)
509 {
510 ERROR ("tcpconns plugin: conn_read_netlink: sendmsg(2) failed: %s",
511 sstrerror (errno, buf, sizeof (buf)));
512 close (fd);
513 return (-1);
514 }
516 iov.iov_base = buf;
517 iov.iov_len = sizeof(buf);
519 while (1)
520 {
521 int status;
522 struct nlmsghdr *h;
524 memset(&msg, 0, sizeof(msg));
525 msg.msg_name = (void*)&nladdr;
526 msg.msg_namelen = sizeof(nladdr);
527 msg.msg_iov = &iov;
528 msg.msg_iovlen = 1;
530 status = recvmsg(fd, (void *) &msg, /* flags = */ 0);
531 if (status < 0)
532 {
533 if ((errno == EINTR) || (errno == EAGAIN))
534 continue;
536 ERROR ("tcpconns plugin: conn_read_netlink: recvmsg(2) failed: %s",
537 sstrerror (errno, buf, sizeof (buf)));
538 close (fd);
539 return (-1);
540 }
541 else if (status == 0)
542 {
543 close (fd);
544 DEBUG ("tcpconns plugin: conn_read_netlink: Unexpected zero-sized "
545 "reply from netlink socket.");
546 return (0);
547 }
549 h = (struct nlmsghdr*)buf;
550 while (NLMSG_OK(h, status))
551 {
552 if (h->nlmsg_seq != sequence_number)
553 {
554 h = NLMSG_NEXT(h, status);
555 continue;
556 }
558 if (h->nlmsg_type == NLMSG_DONE)
559 {
560 close (fd);
561 return (0);
562 }
563 else if (h->nlmsg_type == NLMSG_ERROR)
564 {
565 struct nlmsgerr *msg_error;
567 msg_error = NLMSG_DATA(h);
568 WARNING ("tcpconns plugin: conn_read_netlink: Received error %i.",
569 msg_error->error);
571 close (fd);
572 return (1);
573 }
575 r = NLMSG_DATA(h);
577 /* This code does not (need to) distinguish between IPv4 and IPv6. */
578 conn_handle_ports (ntohs(r->id.idiag_sport),
579 ntohs(r->id.idiag_dport),
580 r->idiag_state);
582 h = NLMSG_NEXT(h, status);
583 } /* while (NLMSG_OK) */
584 } /* while (1) */
586 /* Not reached because the while() loop above handles the exit condition. */
587 return (0);
588 #else
589 return (1);
590 #endif /* HAVE_STRUCT_LINUX_INET_DIAG_REQ */
591 } /* int conn_read_netlink */
593 static int conn_handle_line (char *buffer)
594 {
595 char *fields[32];
596 int fields_len;
598 char *endptr;
600 char *port_local_str;
601 char *port_remote_str;
602 uint16_t port_local;
603 uint16_t port_remote;
605 uint8_t state;
607 int buffer_len = strlen (buffer);
609 while ((buffer_len > 0) && (buffer[buffer_len - 1] < 32))
610 buffer[--buffer_len] = '\0';
611 if (buffer_len <= 0)
612 return (-1);
614 fields_len = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
615 if (fields_len < 12)
616 {
617 DEBUG ("tcpconns plugin: Got %i fields, expected at least 12.", fields_len);
618 return (-1);
619 }
621 port_local_str = strchr (fields[1], ':');
622 port_remote_str = strchr (fields[2], ':');
624 if ((port_local_str == NULL) || (port_remote_str == NULL))
625 return (-1);
626 port_local_str++;
627 port_remote_str++;
628 if ((*port_local_str == '\0') || (*port_remote_str == '\0'))
629 return (-1);
631 endptr = NULL;
632 port_local = (uint16_t) strtol (port_local_str, &endptr, 16);
633 if ((endptr == NULL) || (*endptr != '\0'))
634 return (-1);
636 endptr = NULL;
637 port_remote = (uint16_t) strtol (port_remote_str, &endptr, 16);
638 if ((endptr == NULL) || (*endptr != '\0'))
639 return (-1);
641 endptr = NULL;
642 state = (uint8_t) strtol (fields[3], &endptr, 16);
643 if ((endptr == NULL) || (*endptr != '\0'))
644 return (-1);
646 return (conn_handle_ports (port_local, port_remote, state));
647 } /* int conn_handle_line */
649 static int conn_read_file (const char *file)
650 {
651 FILE *fh;
652 char buffer[1024];
654 fh = fopen (file, "r");
655 if (fh == NULL)
656 return (-1);
658 while (fgets (buffer, sizeof (buffer), fh) != NULL)
659 {
660 conn_handle_line (buffer);
661 } /* while (fgets) */
663 fclose (fh);
665 return (0);
666 } /* int conn_read_file */
667 /* #endif KERNEL_LINUX */
669 #elif HAVE_SYSCTLBYNAME
670 /* #endif HAVE_SYSCTLBYNAME */
672 #elif HAVE_LIBKVM_NLIST
673 #endif /* HAVE_LIBKVM_NLIST */
675 static int conn_config (const char *key, const char *value)
676 {
677 if (strcasecmp (key, "ListeningPorts") == 0)
678 {
679 if (IS_TRUE (value))
680 port_collect_listening = 1;
681 else
682 port_collect_listening = 0;
683 }
684 else if ((strcasecmp (key, "LocalPort") == 0)
685 || (strcasecmp (key, "RemotePort") == 0))
686 {
687 port_entry_t *pe;
688 int port = atoi (value);
690 if ((port < 1) || (port > 65535))
691 {
692 ERROR ("tcpconns plugin: Invalid port: %i", port);
693 return (1);
694 }
696 pe = conn_get_port_entry ((uint16_t) port, 1 /* create */);
697 if (pe == NULL)
698 {
699 ERROR ("tcpconns plugin: conn_get_port_entry failed.");
700 return (1);
701 }
703 if (strcasecmp (key, "LocalPort") == 0)
704 pe->flags |= PORT_COLLECT_LOCAL;
705 else
706 pe->flags |= PORT_COLLECT_REMOTE;
707 }
708 else
709 {
710 return (-1);
711 }
713 return (0);
714 } /* int conn_config */
716 #if KERNEL_LINUX
717 static int conn_init (void)
718 {
719 if (port_list_head == NULL)
720 port_collect_listening = 1;
722 return (0);
723 } /* int conn_init */
725 static int conn_read (void)
726 {
727 int status;
729 conn_reset_port_entry ();
731 if (linux_source == SRC_NETLINK)
732 {
733 status = conn_read_netlink ();
734 }
735 else if (linux_source == SRC_PROC)
736 {
737 int errors_num = 0;
739 if (conn_read_file ("/proc/net/tcp") != 0)
740 errors_num++;
741 if (conn_read_file ("/proc/net/tcp6") != 0)
742 errors_num++;
744 if (errors_num < 2)
745 status = 0;
746 else
747 status = ENOENT;
748 }
749 else /* if (linux_source == SRC_DUNNO) */
750 {
751 /* Try to use netlink for getting this data, it is _much_ faster on systems
752 * with a large amount of connections. */
753 status = conn_read_netlink ();
754 if (status == 0)
755 {
756 INFO ("tcpconns plugin: Reading from netlink succeeded. "
757 "Will use the netlink method from now on.");
758 linux_source = SRC_NETLINK;
759 }
760 else
761 {
762 INFO ("tcpconns plugin: Reading from netlink failed. "
763 "Will read from /proc from now on.");
764 linux_source = SRC_PROC;
766 /* return success here to avoid the "plugin failed" message. */
767 return (0);
768 }
769 }
771 if (status == 0)
772 conn_submit_all ();
773 else
774 return (status);
776 return (0);
777 } /* int conn_read */
778 /* #endif KERNEL_LINUX */
780 #elif HAVE_SYSCTLBYNAME
781 static int conn_read (void)
782 {
783 int status;
784 char *buffer;
785 size_t buffer_len;;
787 struct xinpgen *in_orig;
788 struct xinpgen *in_ptr;
790 conn_reset_port_entry ();
792 buffer_len = 0;
793 status = sysctlbyname ("net.inet.tcp.pcblist", NULL, &buffer_len, 0, 0);
794 if (status < 0)
795 {
796 ERROR ("tcpconns plugin: sysctlbyname failed.");
797 return (-1);
798 }
800 buffer = (char *) malloc (buffer_len);
801 if (buffer == NULL)
802 {
803 ERROR ("tcpconns plugin: malloc failed.");
804 return (-1);
805 }
807 status = sysctlbyname ("net.inet.tcp.pcblist", buffer, &buffer_len, 0, 0);
808 if (status < 0)
809 {
810 ERROR ("tcpconns plugin: sysctlbyname failed.");
811 sfree (buffer);
812 return (-1);
813 }
815 if (buffer_len <= sizeof (struct xinpgen))
816 {
817 ERROR ("tcpconns plugin: (buffer_len <= sizeof (struct xinpgen))");
818 sfree (buffer);
819 return (-1);
820 }
822 in_orig = (struct xinpgen *) buffer;
823 for (in_ptr = (struct xinpgen *) (((char *) in_orig) + in_orig->xig_len);
824 in_ptr->xig_len > sizeof (struct xinpgen);
825 in_ptr = (struct xinpgen *) (((char *) in_ptr) + in_ptr->xig_len))
826 {
827 struct tcpcb *tp = &((struct xtcpcb *) in_ptr)->xt_tp;
828 struct inpcb *inp = &((struct xtcpcb *) in_ptr)->xt_inp;
829 struct xsocket *so = &((struct xtcpcb *) in_ptr)->xt_socket;
831 /* Ignore non-TCP sockets */
832 if (so->xso_protocol != IPPROTO_TCP)
833 continue;
835 /* Ignore PCBs which were freed during copyout. */
836 if (inp->inp_gencnt > in_orig->xig_gen)
837 continue;
839 if (((inp->inp_vflag & INP_IPV4) == 0)
840 && ((inp->inp_vflag & INP_IPV6) == 0))
841 continue;
843 conn_handle_ports (ntohs (inp->inp_lport), ntohs (inp->inp_fport),
844 tp->t_state);
845 } /* for (in_ptr) */
847 in_orig = NULL;
848 in_ptr = NULL;
849 sfree (buffer);
851 conn_submit_all ();
853 return (0);
854 } /* int conn_read */
855 /* #endif HAVE_SYSCTLBYNAME */
857 #elif HAVE_LIBKVM_NLIST
858 static int kread (u_long addr, void *buf, int size)
859 {
860 int status;
862 status = kvm_read (kvmd, addr, buf, size);
863 if (status != size)
864 {
865 ERROR ("tcpconns plugin: kvm_read failed (got %i, expected %i): %s\n",
866 status, size, kvm_geterr (kvmd));
867 return (-1);
868 }
869 return (0);
870 } /* int kread */
872 static int conn_init (void)
873 {
874 char buf[_POSIX2_LINE_MAX];
875 struct nlist nl[] =
876 {
877 #define N_TCBTABLE 0
878 { "_tcbtable" },
879 { "" }
880 };
881 int status;
883 kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
884 if (kvmd == NULL)
885 {
886 ERROR ("tcpconns plugin: kvm_openfiles failed: %s", buf);
887 return (-1);
888 }
890 status = kvm_nlist (kvmd, nl);
891 if (status < 0)
892 {
893 ERROR ("tcpconns plugin: kvm_nlist failed with status %i.", status);
894 return (-1);
895 }
897 if (nl[N_TCBTABLE].n_type == 0)
898 {
899 ERROR ("tcpconns plugin: Error looking up kernel's namelist: "
900 "N_TCBTABLE is invalid.");
901 return (-1);
902 }
904 inpcbtable_off = (u_long) nl[N_TCBTABLE].n_value;
905 inpcbtable_ptr = (struct inpcbtable *) nl[N_TCBTABLE].n_value;
907 return (0);
908 } /* int conn_init */
910 static int conn_read (void)
911 {
912 struct inpcbtable table;
913 struct inpcb *head;
914 struct inpcb *next;
915 struct inpcb inpcb;
916 struct tcpcb tcpcb;
917 int status;
919 conn_reset_port_entry ();
921 /* Read the pcbtable from the kernel */
922 status = kread (inpcbtable_off, &table, sizeof (table));
923 if (status != 0)
924 return (-1);
926 /* Get the `head' pcb */
927 head = (struct inpcb *) &(inpcbtable_ptr->inpt_queue);
928 /* Get the first pcb */
929 next = (struct inpcb *)CIRCLEQ_FIRST (&table.inpt_queue);
931 while (next != head)
932 {
933 /* Read the pcb pointed to by `next' into `inpcb' */
934 status = kread ((u_long) next, &inpcb, sizeof (inpcb));
935 if (status != 0)
936 return (-1);
938 /* Advance `next' */
939 next = (struct inpcb *)CIRCLEQ_NEXT (&inpcb, inp_queue);
941 /* Ignore sockets, that are not connected. */
942 #ifdef __NetBSD__
943 if (inpcb.inp_af == AF_INET6)
944 continue; /* XXX see netbsd/src/usr.bin/netstat/inet6.c */
945 #else
946 if (!(inpcb.inp_flags & INP_IPV6)
947 && (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY))
948 continue;
949 if ((inpcb.inp_flags & INP_IPV6)
950 && IN6_IS_ADDR_UNSPECIFIED (&inpcb.inp_laddr6))
951 continue;
952 #endif
954 status = kread ((u_long) inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
955 if (status != 0)
956 return (-1);
957 conn_handle_ports (ntohs(inpcb.inp_lport), ntohs(inpcb.inp_fport), tcpcb.t_state);
958 } /* while (next != head) */
960 conn_submit_all ();
962 return (0);
963 }
964 /* #endif HAVE_LIBKVM_NLIST */
966 #elif KERNEL_AIX
968 static int conn_read (void)
969 {
970 int size;
971 int i;
972 int nconn;
973 void *data;
974 struct netinfo_header *header;
975 struct netinfo_conn *conn;
977 conn_reset_port_entry ();
979 size = netinfo(NETINFO_TCP, 0, 0, 0);
980 if (size < 0)
981 {
982 ERROR ("tcpconns plugin: netinfo failed return: %i", size);
983 return (-1);
984 }
986 if (size == 0)
987 return (0);
989 if ((size - sizeof (struct netinfo_header)) % sizeof (struct netinfo_conn))
990 {
991 ERROR ("tcpconns plugin: invalid buffer size");
992 return (-1);
993 }
995 data = malloc(size);
996 if (data == NULL)
997 {
998 ERROR ("tcpconns plugin: malloc failed");
999 return (-1);
1000 }
1002 if (netinfo(NETINFO_TCP, data, &size, 0) < 0)
1003 {
1004 ERROR ("tcpconns plugin: netinfo failed");
1005 free(data);
1006 return (-1);
1007 }
1009 header = (struct netinfo_header *)data;
1010 nconn = header->size;
1011 conn = (struct netinfo_conn *)(data + sizeof(struct netinfo_header));
1013 for (i=0; i < nconn; conn++, i++)
1014 {
1015 conn_handle_ports (conn->srcport, conn->dstport, conn->tcp_state);
1016 }
1018 free(data);
1020 conn_submit_all ();
1022 return (0);
1023 }
1024 #endif /* KERNEL_AIX */
1026 void module_register (void)
1027 {
1028 plugin_register_config ("tcpconns", conn_config,
1029 config_keys, config_keys_num);
1030 #if KERNEL_LINUX
1031 plugin_register_init ("tcpconns", conn_init);
1032 #elif HAVE_SYSCTLBYNAME
1033 /* no initialization */
1034 #elif HAVE_LIBKVM_NLIST
1035 plugin_register_init ("tcpconns", conn_init);
1036 #elif KERNEL_AIX
1037 /* no initialization */
1038 #endif
1039 plugin_register_read ("tcpconns", conn_read);
1040 } /* void module_register */
1042 /*
1043 * vim: set shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker :
1044 */