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7636bc714a5fe5ecdde9e3b63e234686731a098f
1 /******************************************************************************
2 *
3 * Nagios check_icmp plugin
4 *
5 * License: GPL
6 * Copyright (c) 2005-2007 nagios-plugins team
7 *
8 * Original Author : Andreas Ericsson <ae@op5.se>
9 *
10 * Last Modified: $Date$
11 *
12 * Description:
13 *
14 * This file contains the check_icmp plugin
15 *
16 * Relevant RFC's: 792 (ICMP), 791 (IP)
17 *
18 * This program was modeled somewhat after the check_icmp program,
19 * which was in turn a hack of fping (www.fping.org) but has been
20 * completely rewritten since to generate higher precision rta values,
21 * and support several different modes as well as setting ttl to control.
22 * redundant routes. The only remainders of fping is currently a few
23 * function names.
24 *
25 * License Information:
26 *
27 * This program is free software; you can redistribute it and/or modify
28 * it under the terms of the GNU General Public License as published by
29 * the Free Software Foundation; either version 2 of the License, or
30 * (at your option) any later version.
31 *
32 * This program is distributed in the hope that it will be useful,
33 * but WITHOUT ANY WARRANTY; without even the implied warranty of
34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
35 * GNU General Public License for more details.
36 *
37 * You should have received a copy of the GNU General Public License
38 * along with this program; if not, write to the Free Software
39 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
40 *
41 * $Id$
42 *
43 *****************************************************************************/
45 /* progname may change */
46 /* char *progname = "check_icmp"; */
47 char *progname;
48 const char *revision = "$Revision$";
49 const char *copyright = "2005-2007";
50 const char *email = "nagiosplug-devel@lists.sourceforge.net";
52 /** nagios plugins basic includes */
53 #include "common.h"
54 #include "netutils.h"
55 #include "utils.h"
57 #include <sys/time.h>
58 #include <sys/types.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <stdarg.h>
62 #include <unistd.h>
63 #include <stddef.h>
64 #include <errno.h>
65 #include <string.h>
66 #include <ctype.h>
67 #include <netdb.h>
68 #include <sys/socket.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/in.h>
71 #include <netinet/ip.h>
72 #include <netinet/ip_icmp.h>
73 #include <arpa/inet.h>
74 #include <signal.h>
77 /** sometimes undefined system macros (quite a few, actually) **/
78 #ifndef MAXTTL
79 # define MAXTTL 255
80 #endif
81 #ifndef INADDR_NONE
82 # define INADDR_NONE 0xffffffU
83 #endif
85 #ifndef SOL_IP
86 #define SOL_IP 0
87 #endif
89 /* we bundle these in one #ifndef, since they're all from BSD
90 * Put individual #ifndef's around those that bother you */
91 #ifndef ICMP_UNREACH_NET_UNKNOWN
92 # define ICMP_UNREACH_NET_UNKNOWN 6
93 # define ICMP_UNREACH_HOST_UNKNOWN 7
94 # define ICMP_UNREACH_ISOLATED 8
95 # define ICMP_UNREACH_NET_PROHIB 9
96 # define ICMP_UNREACH_HOST_PROHIB 10
97 # define ICMP_UNREACH_TOSNET 11
98 # define ICMP_UNREACH_TOSHOST 12
99 #endif
100 /* tru64 has the ones above, but not these */
101 #ifndef ICMP_UNREACH_FILTER_PROHIB
102 # define ICMP_UNREACH_FILTER_PROHIB 13
103 # define ICMP_UNREACH_HOST_PRECEDENCE 14
104 # define ICMP_UNREACH_PRECEDENCE_CUTOFF 15
105 #endif
108 typedef unsigned short range_t; /* type for get_range() -- unimplemented */
110 typedef struct rta_host {
111 unsigned short id; /* id in **table, and icmp pkts */
112 char *name; /* arg used for adding this host */
113 char *msg; /* icmp error message, if any */
114 struct sockaddr_in saddr_in; /* the address of this host */
115 struct in_addr error_addr; /* stores address of error replies */
116 unsigned long long time_waited; /* total time waited, in usecs */
117 unsigned int icmp_sent, icmp_recv, icmp_lost; /* counters */
118 unsigned char icmp_type, icmp_code; /* type and code from errors */
119 unsigned short flags; /* control/status flags */
120 double rta; /* measured RTA */
121 unsigned char pl; /* measured packet loss */
122 struct rta_host *next; /* linked list */
123 } rta_host;
125 #define FLAG_LOST_CAUSE 0x01 /* decidedly dead target. */
127 /* threshold structure. all values are maximum allowed, exclusive */
128 typedef struct threshold {
129 unsigned char pl; /* max allowed packet loss in percent */
130 unsigned int rta; /* roundtrip time average, microseconds */
131 } threshold;
133 /* the data structure */
134 typedef struct icmp_ping_data {
135 struct timeval stime; /* timestamp (saved in protocol struct as well) */
136 unsigned short ping_id;
137 } icmp_ping_data;
139 /* the different modes of this program are as follows:
140 * MODE_RTA: send all packets no matter what (mimic check_icmp and check_ping)
141 * MODE_HOSTCHECK: Return immediately upon any sign of life
142 * In addition, sends packets to ALL addresses assigned
143 * to this host (as returned by gethostbyname() or
144 * gethostbyaddr() and expects one host only to be checked at
145 * a time. Therefore, any packet response what so ever will
146 * count as a sign of life, even when received outside
147 * crit.rta limit. Do not misspell any additional IP's.
148 * MODE_ALL: Requires packets from ALL requested IP to return OK (default).
149 * MODE_ICMP: implement something similar to check_icmp (MODE_RTA without
150 * tcp and udp args does this)
151 */
152 #define MODE_RTA 0
153 #define MODE_HOSTCHECK 1
154 #define MODE_ALL 2
155 #define MODE_ICMP 3
157 /* the different ping types we can do
158 * TODO: investigate ARP ping as well */
159 #define HAVE_ICMP 1
160 #define HAVE_UDP 2
161 #define HAVE_TCP 4
162 #define HAVE_ARP 8
164 #define MIN_PING_DATA_SIZE sizeof(struct icmp_ping_data)
165 #define MAX_IP_PKT_SIZE 65536 /* (theoretical) max IP packet size */
166 #define IP_HDR_SIZE 20
167 #define MAX_PING_DATA (MAX_IP_PKT_SIZE - IP_HDR_SIZE - ICMP_MINLEN)
168 #define DEFAULT_PING_DATA_SIZE (MIN_PING_DATA_SIZE + 44)
170 /* various target states */
171 #define TSTATE_INACTIVE 0x01 /* don't ping this host anymore */
172 #define TSTATE_WAITING 0x02 /* unanswered packets on the wire */
173 #define TSTATE_ALIVE 0x04 /* target is alive (has answered something) */
174 #define TSTATE_UNREACH 0x08
176 /** prototypes **/
177 void print_help (void);
178 void print_usage (void);
179 static u_int get_timevar(const char *);
180 static u_int get_timevaldiff(struct timeval *, struct timeval *);
181 static int wait_for_reply(int, u_int);
182 static int recvfrom_wto(int, char *, unsigned int, struct sockaddr *, u_int *);
183 static int send_icmp_ping(int, struct rta_host *);
184 static int get_threshold(char *str, threshold *th);
185 static void run_checks(void);
186 static int add_target(char *);
187 static int add_target_ip(char *, struct in_addr *);
188 static int handle_random_icmp(struct icmp *, struct sockaddr_in *);
189 static unsigned short icmp_checksum(unsigned short *, int);
190 static void finish(int);
191 static void crash(const char *, ...);
193 /** external **/
194 extern int optind, opterr, optopt;
195 extern char *optarg;
196 extern char **environ;
198 /** global variables **/
199 static struct rta_host **table, *cursor, *list;
200 static threshold crit = {80, 500000}, warn = {40, 200000};
201 static int mode, protocols, sockets, debug = 0, timeout = 10;
202 static unsigned short icmp_pkt_size, icmp_data_size = DEFAULT_PING_DATA_SIZE;
203 static unsigned int icmp_sent = 0, icmp_recv = 0, icmp_lost = 0;
204 #define icmp_pkts_en_route (icmp_sent - (icmp_recv + icmp_lost))
205 static unsigned short targets_down = 0, targets = 0, packets = 0;
206 #define targets_alive (targets - targets_down)
207 static unsigned int retry_interval, pkt_interval, target_interval;
208 static int icmp_sock, tcp_sock, udp_sock, status = STATE_OK;
209 static pid_t pid;
210 static struct timezone tz;
211 static struct timeval prog_start;
212 static unsigned long long max_completion_time = 0;
213 static unsigned char ttl = 0; /* outgoing ttl */
214 static unsigned int warn_down = 1, crit_down = 1; /* host down threshold values */
215 static int min_hosts_alive = -1;
216 float pkt_backoff_factor = 1.5;
217 float target_backoff_factor = 1.5;
219 /** code start **/
220 static void
221 crash(const char *fmt, ...)
222 {
223 va_list ap;
225 printf("%s: ", progname);
227 va_start(ap, fmt);
228 vprintf(fmt, ap);
229 va_end(ap);
231 if(errno) printf(": %s", strerror(errno));
232 puts("");
234 exit(3);
235 }
238 static char *
239 get_icmp_error_msg(unsigned char icmp_type, unsigned char icmp_code)
240 {
241 char *msg = "unreachable";
243 if(debug > 1) printf("get_icmp_error_msg(%u, %u)\n", icmp_type, icmp_code);
244 switch(icmp_type) {
245 case ICMP_UNREACH:
246 switch(icmp_code) {
247 case ICMP_UNREACH_NET: msg = "Net unreachable"; break;
248 case ICMP_UNREACH_HOST: msg = "Host unreachable"; break;
249 case ICMP_UNREACH_PROTOCOL: msg = "Protocol unreachable (firewall?)"; break;
250 case ICMP_UNREACH_PORT: msg = "Port unreachable (firewall?)"; break;
251 case ICMP_UNREACH_NEEDFRAG: msg = "Fragmentation needed"; break;
252 case ICMP_UNREACH_SRCFAIL: msg = "Source route failed"; break;
253 case ICMP_UNREACH_ISOLATED: msg = "Source host isolated"; break;
254 case ICMP_UNREACH_NET_UNKNOWN: msg = "Unknown network"; break;
255 case ICMP_UNREACH_HOST_UNKNOWN: msg = "Unknown host"; break;
256 case ICMP_UNREACH_NET_PROHIB: msg = "Network denied (firewall?)"; break;
257 case ICMP_UNREACH_HOST_PROHIB: msg = "Host denied (firewall?)"; break;
258 case ICMP_UNREACH_TOSNET: msg = "Bad TOS for network (firewall?)"; break;
259 case ICMP_UNREACH_TOSHOST: msg = "Bad TOS for host (firewall?)"; break;
260 case ICMP_UNREACH_FILTER_PROHIB: msg = "Prohibited by filter (firewall)"; break;
261 case ICMP_UNREACH_HOST_PRECEDENCE: msg = "Host precedence violation"; break;
262 case ICMP_UNREACH_PRECEDENCE_CUTOFF: msg = "Precedence cutoff"; break;
263 default: msg = "Invalid code"; break;
264 }
265 break;
267 case ICMP_TIMXCEED:
268 /* really 'out of reach', or non-existant host behind a router serving
269 * two different subnets */
270 switch(icmp_code) {
271 case ICMP_TIMXCEED_INTRANS: msg = "Time to live exceeded in transit"; break;
272 case ICMP_TIMXCEED_REASS: msg = "Fragment reassembly time exceeded"; break;
273 default: msg = "Invalid code"; break;
274 }
275 break;
277 case ICMP_SOURCEQUENCH: msg = "Transmitting too fast"; break;
278 case ICMP_REDIRECT: msg = "Redirect (change route)"; break;
279 case ICMP_PARAMPROB: msg = "Bad IP header (required option absent)"; break;
281 /* the following aren't error messages, so ignore */
282 case ICMP_TSTAMP:
283 case ICMP_TSTAMPREPLY:
284 case ICMP_IREQ:
285 case ICMP_IREQREPLY:
286 case ICMP_MASKREQ:
287 case ICMP_MASKREPLY:
288 default: msg = ""; break;
289 }
291 return msg;
292 }
294 static int
295 handle_random_icmp(struct icmp *p, struct sockaddr_in *addr)
296 {
297 struct icmp sent_icmp;
298 struct rta_host *host = NULL;
299 unsigned char *ptr;
301 if(p->icmp_type == ICMP_ECHO && p->icmp_id == pid) {
302 /* echo request from us to us (pinging localhost) */
303 return 0;
304 }
306 ptr = (unsigned char *)p;
307 if(debug) printf("handle_random_icmp(%p, %p)\n", (void *)p, (void *)addr);
309 /* only handle a few types, since others can't possibly be replies to
310 * us in a sane network (if it is anyway, it will be counted as lost
311 * at summary time, but not as quickly as a proper response */
312 /* TIMXCEED can be an unreach from a router with multiple IP's which
313 * serves two different subnets on the same interface and a dead host
314 * on one net is pinged from the other. The router will respond to
315 * itself and thus set TTL=0 so as to not loop forever. Even when
316 * TIMXCEED actually sends a proper icmp response we will have passed
317 * too many hops to have a hope of reaching it later, in which case it
318 * indicates overconfidence in the network, poor routing or both. */
319 if(p->icmp_type != ICMP_UNREACH && p->icmp_type != ICMP_TIMXCEED &&
320 p->icmp_type != ICMP_SOURCEQUENCH && p->icmp_type != ICMP_PARAMPROB)
321 {
322 return 0;
323 }
325 /* might be for us. At least it holds the original package (according
326 * to RFC 792). If it isn't, just ignore it */
327 memcpy(&sent_icmp, ptr + 28, sizeof(sent_icmp));
328 if(sent_icmp.icmp_type != ICMP_ECHO || sent_icmp.icmp_id != pid ||
329 sent_icmp.icmp_seq >= targets)
330 {
331 if(debug) printf("Packet is no response to a packet we sent\n");
332 return 0;
333 }
335 /* it is indeed a response for us */
336 host = table[sent_icmp.icmp_seq];
337 if(debug) {
338 printf("Received \"%s\" from %s for ICMP ECHO sent to %s.\n",
339 get_icmp_error_msg(p->icmp_type, p->icmp_code),
340 inet_ntoa(addr->sin_addr), host->name);
341 }
343 icmp_lost++;
344 host->icmp_lost++;
345 /* don't spend time on lost hosts any more */
346 if(host->flags & FLAG_LOST_CAUSE) return 0;
348 /* source quench means we're sending too fast, so increase the
349 * interval and mark this packet lost */
350 if(p->icmp_type == ICMP_SOURCEQUENCH) {
351 pkt_interval *= pkt_backoff_factor;
352 target_interval *= target_backoff_factor;
353 }
354 else {
355 targets_down++;
356 host->flags |= FLAG_LOST_CAUSE;
357 }
358 host->icmp_type = p->icmp_type;
359 host->icmp_code = p->icmp_code;
360 host->error_addr.s_addr = addr->sin_addr.s_addr;
362 return 0;
363 }
365 int
366 main(int argc, char **argv)
367 {
368 int i;
369 char *ptr;
370 long int arg;
371 int icmp_sockerrno, udp_sockerrno, tcp_sockerrno;
372 int result;
373 struct rta_host *host;
375 setlocale (LC_ALL, "");
376 bindtextdomain (PACKAGE, LOCALEDIR);
377 textdomain (PACKAGE);
379 /* print a helpful error message if geteuid != 0 */
380 np_warn_if_not_root();
382 /* we only need to be setsuid when we get the sockets, so do
383 * that before pointer magic (esp. on network data) */
384 icmp_sockerrno = udp_sockerrno = tcp_sockerrno = sockets = 0;
386 if((icmp_sock = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) != -1)
387 sockets |= HAVE_ICMP;
388 else icmp_sockerrno = errno;
390 /* if((udp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1) */
391 /* sockets |= HAVE_UDP; */
392 /* else udp_sockerrno = errno; */
394 /* if((tcp_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1) */
395 /* sockets |= HAVE_TCP; */
396 /* else tcp_sockerrno = errno; */
398 /* now drop privileges (no effect if not setsuid or geteuid() == 0) */
399 setuid(getuid());
401 /* POSIXLY_CORRECT might break things, so unset it (the portable way) */
402 environ = NULL;
404 /* use the pid to mark packets as ours */
405 /* Some systems have 32-bit pid_t so mask off only 16 bits */
406 pid = getpid() & 0xffff;
407 /* printf("pid = %u\n", pid); */
409 /* get calling name the old-fashioned way for portability instead
410 * of relying on the glibc-ism __progname */
411 ptr = strrchr(argv[0], '/');
412 if(ptr) progname = &ptr[1];
413 else progname = argv[0];
415 /* now set defaults. Use progname to set them initially (allows for
416 * superfast check_host program when target host is up */
417 cursor = list = NULL;
418 table = NULL;
420 mode = MODE_RTA;
421 crit.rta = 500000;
422 crit.pl = 80;
423 warn.rta = 200000;
424 warn.pl = 40;
425 protocols = HAVE_ICMP | HAVE_UDP | HAVE_TCP;
426 pkt_interval = 80000; /* 80 msec packet interval by default */
427 packets = 5;
429 if(!strcmp(progname, "check_icmp") || !strcmp(progname, "check_ping")) {
430 mode = MODE_ICMP;
431 protocols = HAVE_ICMP;
432 }
433 else if(!strcmp(progname, "check_host")) {
434 mode = MODE_HOSTCHECK;
435 pkt_interval = 1000000;
436 packets = 5;
437 crit.rta = warn.rta = 1000000;
438 crit.pl = warn.pl = 100;
439 }
440 else if(!strcmp(progname, "check_rta_multi")) {
441 mode = MODE_ALL;
442 target_interval = 0;
443 pkt_interval = 50000;
444 packets = 5;
445 }
447 /* parse the arguments */
448 for(i = 1; i < argc; i++) {
449 while((arg = getopt(argc, argv, "vhVw:c:n:p:t:H:i:b:I:l:m:")) != EOF) {
450 switch(arg) {
451 case 'v':
452 debug++;
453 break;
454 case 'b':
455 /* silently ignored for now */
456 break;
457 case 'i':
458 pkt_interval = get_timevar(optarg);
459 break;
460 case 'I':
461 target_interval = get_timevar(optarg);
462 break;
463 case 'w':
464 get_threshold(optarg, &warn);
465 break;
466 case 'c':
467 get_threshold(optarg, &crit);
468 break;
469 case 'n':
470 case 'p':
471 packets = strtoul(optarg, NULL, 0);
472 break;
473 case 't':
474 timeout = strtoul(optarg, NULL, 0);
475 if(!timeout) timeout = 10;
476 break;
477 case 'H':
478 add_target(optarg);
479 break;
480 case 'l':
481 ttl = (unsigned char)strtoul(optarg, NULL, 0);
482 break;
483 case 'm':
484 min_hosts_alive = (int)strtoul(optarg, NULL, 0);
485 break;
486 case 'd': /* implement later, for cluster checks */
487 warn_down = (unsigned char)strtoul(optarg, &ptr, 0);
488 if(ptr) {
489 crit_down = (unsigned char)strtoul(ptr + 1, NULL, 0);
490 }
491 break;
492 case 'V': /* version */
493 /*print_revision (progname, revision);*/ /* FIXME: Why? */
494 exit (STATE_OK);
495 case 'h': /* help */
496 print_help ();
497 exit (STATE_OK);
498 }
499 }
500 }
502 argv = &argv[optind];
503 while(*argv) {
504 add_target(*argv);
505 argv++;
506 }
507 if(!targets) {
508 errno = 0;
509 crash("No hosts to check");
510 exit(3);
511 }
513 if(!sockets) {
514 if(icmp_sock == -1) {
515 errno = icmp_sockerrno;
516 crash("Failed to obtain ICMP socket");
517 return -1;
518 }
519 /* if(udp_sock == -1) { */
520 /* errno = icmp_sockerrno; */
521 /* crash("Failed to obtain UDP socket"); */
522 /* return -1; */
523 /* } */
524 /* if(tcp_sock == -1) { */
525 /* errno = icmp_sockerrno; */
526 /* crash("Failed to obtain TCP socker"); */
527 /* return -1; */
528 /* } */
529 }
530 if(!ttl) ttl = 64;
532 if(icmp_sock) {
533 result = setsockopt(icmp_sock, SOL_IP, IP_TTL, &ttl, sizeof(ttl));
534 if(debug) {
535 if(result == -1) printf("setsockopt failed\n");
536 else printf("ttl set to %u\n", ttl);
537 }
538 }
540 /* stupid users should be able to give whatever thresholds they want
541 * (nothing will break if they do), but some anal plugin maintainer
542 * will probably add some printf() thing here later, so it might be
543 * best to at least show them where to do it. ;) */
544 if(warn.pl > crit.pl) warn.pl = crit.pl;
545 if(warn.rta > crit.rta) warn.rta = crit.rta;
546 if(warn_down > crit_down) crit_down = warn_down;
548 signal(SIGINT, finish);
549 signal(SIGHUP, finish);
550 signal(SIGTERM, finish);
551 signal(SIGALRM, finish);
552 if(debug) printf("Setting alarm timeout to %u seconds\n", timeout);
553 alarm(timeout);
555 /* make sure we don't wait any longer than necessary */
556 gettimeofday(&prog_start, &tz);
557 max_completion_time =
558 ((targets * packets * pkt_interval) + (targets * target_interval)) +
559 (targets * packets * crit.rta) + crit.rta;
561 if(debug) {
562 printf("packets: %u, targets: %u\n"
563 "target_interval: %0.3f, pkt_interval %0.3f\n"
564 "crit.rta: %0.3f\n"
565 "max_completion_time: %0.3f\n",
566 packets, targets,
567 (float)target_interval / 1000, (float)pkt_interval / 1000,
568 (float)crit.rta / 1000,
569 (float)max_completion_time / 1000);
570 }
572 if(debug) {
573 if(max_completion_time > (u_int)timeout * 1000000) {
574 printf("max_completion_time: %llu timeout: %u\n",
575 max_completion_time, timeout);
576 printf("Timout must be at lest %llu\n",
577 max_completion_time / 1000000 + 1);
578 }
579 }
581 icmp_pkt_size = icmp_data_size + ICMP_MINLEN;
582 if(debug > 2) printf("icmp_pkt_size = %u\n", icmp_pkt_size);
583 if(icmp_pkt_size < sizeof(struct icmp) + sizeof(struct icmp_ping_data)) {
584 icmp_pkt_size = sizeof(struct icmp) + sizeof(struct icmp_ping_data);
585 }
586 if(debug > 2) printf("icmp_pkt_size = %u\n", icmp_pkt_size);
588 if(debug) {
589 printf("crit = {%u, %u%%}, warn = {%u, %u%%}\n",
590 crit.rta, crit.pl, warn.rta, warn.pl);
591 printf("pkt_interval: %u target_interval: %u retry_interval: %u\n",
592 pkt_interval, target_interval, retry_interval);
593 printf("icmp_pkt_size: %u timeout: %u\n",
594 icmp_pkt_size, timeout);
595 }
597 if(packets > 20) {
598 errno = 0;
599 crash("packets is > 20 (%d)", packets);
600 }
602 if(min_hosts_alive < -1) {
603 errno = 0;
604 crash("minimum alive hosts is negative (%i)", min_hosts_alive);
605 }
607 host = list;
608 table = malloc(sizeof(struct rta_host **) * (argc - 1));
609 i = 0;
610 while(host) {
611 host->id = i;
612 table[i] = host;
613 host = host->next;
614 i++;
615 }
617 run_checks();
619 errno = 0;
620 finish(0);
622 return(0);
623 }
625 static void
626 run_checks()
627 {
628 u_int i, t, result;
629 u_int final_wait, time_passed;
631 /* this loop might actually violate the pkt_interval or target_interval
632 * settings, but only if there aren't any packets on the wire which
633 * indicates that the target can handle an increased packet rate */
634 for(i = 0; i < packets; i++) {
635 for(t = 0; t < targets; t++) {
636 /* don't send useless packets */
637 if(!targets_alive) finish(0);
638 if(table[t]->flags & FLAG_LOST_CAUSE) {
639 if(debug) printf("%s is a lost cause. not sending any more\n",
640 table[t]->name);
641 continue;
642 }
644 /* we're still in the game, so send next packet */
645 (void)send_icmp_ping(icmp_sock, table[t]);
646 result = wait_for_reply(icmp_sock, target_interval);
647 }
648 result = wait_for_reply(icmp_sock, pkt_interval * targets);
649 }
651 if(icmp_pkts_en_route && targets_alive) {
652 time_passed = get_timevaldiff(NULL, NULL);
653 final_wait = max_completion_time - time_passed;
655 if(debug) {
656 printf("time_passed: %u final_wait: %u max_completion_time: %llu\n",
657 time_passed, final_wait, max_completion_time);
658 }
659 if(time_passed > max_completion_time) {
660 if(debug) printf("Time passed. Finishing up\n");
661 finish(0);
662 }
664 /* catch the packets that might come in within the timeframe, but
665 * haven't yet */
666 if(debug) printf("Waiting for %u micro-seconds (%0.3f msecs)\n",
667 final_wait, (float)final_wait / 1000);
668 result = wait_for_reply(icmp_sock, final_wait);
669 }
670 }
672 /* response structure:
673 * ip header : 20 bytes
674 * icmp header : 28 bytes
675 * icmp echo reply : the rest
676 */
677 static int
678 wait_for_reply(int sock, u_int t)
679 {
680 int n, hlen;
681 static char buf[4096];
682 struct sockaddr_in resp_addr;
683 struct ip *ip;
684 struct icmp icp;
685 struct rta_host *host;
686 struct icmp_ping_data data;
687 struct timeval wait_start, now;
688 u_int tdiff, i, per_pkt_wait;
690 /* if we can't listen or don't have anything to listen to, just return */
691 if(!t || !icmp_pkts_en_route) return 0;
693 gettimeofday(&wait_start, &tz);
695 i = t;
696 per_pkt_wait = t / icmp_pkts_en_route;
697 while(icmp_pkts_en_route && get_timevaldiff(&wait_start, NULL) < i) {
698 t = per_pkt_wait;
700 /* wrap up if all targets are declared dead */
701 if(!targets_alive ||
702 get_timevaldiff(&prog_start, NULL) >= max_completion_time ||
703 (mode == MODE_HOSTCHECK && targets_down))
704 {
705 finish(0);
706 }
708 /* reap responses until we hit a timeout */
709 n = recvfrom_wto(sock, buf, sizeof(buf),
710 (struct sockaddr *)&resp_addr, &t);
711 if(!n) {
712 if(debug > 1) {
713 printf("recvfrom_wto() timed out during a %u usecs wait\n",
714 per_pkt_wait);
715 }
716 continue; /* timeout for this one, so keep trying */
717 }
718 if(n < 0) {
719 if(debug) printf("recvfrom_wto() returned errors\n");
720 return n;
721 }
723 ip = (struct ip *)buf;
724 if(debug > 1) printf("received %u bytes from %s\n",
725 ntohs(ip->ip_len), inet_ntoa(resp_addr.sin_addr));
727 /* obsolete. alpha on tru64 provides the necessary defines, but isn't broken */
728 /* #if defined( __alpha__ ) && __STDC__ && !defined( __GLIBC__ ) */
729 /* alpha headers are decidedly broken. Using an ansi compiler,
730 * they provide ip_vhl instead of ip_hl and ip_v, so we mask
731 * off the bottom 4 bits */
732 /* hlen = (ip->ip_vhl & 0x0f) << 2; */
733 /* #else */
734 hlen = ip->ip_hl << 2;
735 /* #endif */
737 if(n < (hlen + ICMP_MINLEN)) {
738 crash("received packet too short for ICMP (%d bytes, expected %d) from %s\n",
739 n, hlen + icmp_pkt_size, inet_ntoa(resp_addr.sin_addr));
740 }
741 /* else if(debug) { */
742 /* printf("ip header size: %u, packet size: %u (expected %u, %u)\n", */
743 /* hlen, ntohs(ip->ip_len) - hlen, */
744 /* sizeof(struct ip), icmp_pkt_size); */
745 /* } */
747 /* check the response */
748 memcpy(&icp, buf + hlen, sizeof(icp));
750 if(icp.icmp_id != pid) {
751 handle_random_icmp(&icp, &resp_addr);
752 continue;
753 }
755 if(icp.icmp_type != ICMP_ECHOREPLY || icp.icmp_seq >= targets) {
756 if(debug > 2) printf("not a proper ICMP_ECHOREPLY\n");
757 handle_random_icmp(&icp, &resp_addr);
758 continue;
759 }
761 /* this is indeed a valid response */
762 memcpy(&data, icp.icmp_data, sizeof(data));
764 host = table[icp.icmp_seq];
765 gettimeofday(&now, &tz);
766 tdiff = get_timevaldiff(&data.stime, &now);
768 host->time_waited += tdiff;
769 host->icmp_recv++;
770 icmp_recv++;
772 if(debug) {
773 printf("%0.3f ms rtt from %s, outgoing ttl: %u, incoming ttl: %u\n",
774 (float)tdiff / 1000, inet_ntoa(resp_addr.sin_addr),
775 ttl, ip->ip_ttl);
776 }
778 /* if we're in hostcheck mode, exit with limited printouts */
779 if(mode == MODE_HOSTCHECK) {
780 printf("OK - %s responds to ICMP. Packet %u, rta %0.3fms|"
781 "pkt=%u;;0;%u rta=%0.3f;%0.3f;%0.3f;;\n",
782 host->name, icmp_recv, (float)tdiff / 1000,
783 icmp_recv, packets, (float)tdiff / 1000,
784 (float)warn.rta / 1000, (float)crit.rta / 1000);
785 exit(STATE_OK);
786 }
787 }
789 return 0;
790 }
792 /* the ping functions */
793 static int
794 send_icmp_ping(int sock, struct rta_host *host)
795 {
796 static union {
797 char *buf; /* re-use so we prevent leaks */
798 struct icmp *icp;
799 u_short *cksum_in;
800 } packet = { NULL };
801 long int len;
802 struct icmp_ping_data data;
803 struct timeval tv;
804 struct sockaddr *addr;
806 if(sock == -1) {
807 errno = 0;
808 crash("Attempt to send on bogus socket");
809 return -1;
810 }
811 addr = (struct sockaddr *)&host->saddr_in;
813 if(!packet.buf) {
814 if (!(packet.buf = malloc(icmp_pkt_size))) {
815 crash("send_icmp_ping(): failed to malloc %d bytes for send buffer",
816 icmp_pkt_size);
817 return -1; /* might be reached if we're in debug mode */
818 }
819 }
820 memset(packet.buf, 0, icmp_pkt_size);
822 if((gettimeofday(&tv, &tz)) == -1) return -1;
824 data.ping_id = 10; /* host->icmp.icmp_sent; */
825 memcpy(&data.stime, &tv, sizeof(tv));
826 memcpy(&packet.icp->icmp_data, &data, sizeof(data));
827 packet.icp->icmp_type = ICMP_ECHO;
828 packet.icp->icmp_code = 0;
829 packet.icp->icmp_cksum = 0;
830 packet.icp->icmp_id = pid;
831 packet.icp->icmp_seq = host->id;
832 packet.icp->icmp_cksum = icmp_checksum(packet.cksum_in, icmp_pkt_size);
834 len = sendto(sock, packet.buf, icmp_pkt_size, 0, (struct sockaddr *)addr,
835 sizeof(struct sockaddr));
837 if(len < 0 || (unsigned int)len != icmp_pkt_size) {
838 if(debug) printf("Failed to send ping to %s\n",
839 inet_ntoa(host->saddr_in.sin_addr));
840 return -1;
841 }
843 icmp_sent++;
844 host->icmp_sent++;
846 return 0;
847 }
849 static int
850 recvfrom_wto(int sock, char *buf, unsigned int len, struct sockaddr *saddr,
851 u_int *timo)
852 {
853 u_int slen;
854 int n;
855 struct timeval to, then, now;
856 fd_set rd, wr;
858 if(!*timo) {
859 if(debug) printf("*timo is not\n");
860 return 0;
861 }
863 to.tv_sec = *timo / 1000000;
864 to.tv_usec = (*timo - (to.tv_sec * 1000000));
866 FD_ZERO(&rd);
867 FD_ZERO(&wr);
868 FD_SET(sock, &rd);
869 errno = 0;
870 gettimeofday(&then, &tz);
871 n = select(sock + 1, &rd, &wr, NULL, &to);
872 if(n < 0) crash("select() in recvfrom_wto");
873 gettimeofday(&now, &tz);
874 *timo = get_timevaldiff(&then, &now);
876 if(!n) return 0; /* timeout */
878 slen = sizeof(struct sockaddr);
880 return recvfrom(sock, buf, len, 0, saddr, &slen);
881 }
883 static void
884 finish(int sig)
885 {
886 u_int i = 0;
887 unsigned char pl;
888 double rta;
889 struct rta_host *host;
890 char *status_string[] =
891 {"OK", "WARNING", "CRITICAL", "UNKNOWN", "DEPENDENT"};
892 int hosts_ok = 0;
893 int hosts_warn = 0;
895 alarm(0);
896 if(debug > 1) printf("finish(%d) called\n", sig);
898 if(icmp_sock != -1) close(icmp_sock);
899 if(udp_sock != -1) close(udp_sock);
900 if(tcp_sock != -1) close(tcp_sock);
902 if(debug) {
903 printf("icmp_sent: %u icmp_recv: %u icmp_lost: %u\n",
904 icmp_sent, icmp_recv, icmp_lost);
905 printf("targets: %u targets_alive: %u\n", targets, targets_alive);
906 }
908 /* iterate thrice to calculate values, give output, and print perfparse */
909 host = list;
910 while(host) {
911 if(!host->icmp_recv) {
912 /* rta 0 is ofcourse not entirely correct, but will still show up
913 * conspicuosly as missing entries in perfparse and cacti */
914 pl = 100;
915 rta = 0;
916 status = STATE_CRITICAL;
917 /* up the down counter if not already counted */
918 if(!(host->flags & FLAG_LOST_CAUSE) && targets_alive) targets_down++;
919 }
920 else {
921 pl = ((host->icmp_sent - host->icmp_recv) * 100) / host->icmp_sent;
922 rta = (double)host->time_waited / host->icmp_recv;
923 }
924 host->pl = pl;
925 host->rta = rta;
926 if(pl >= crit.pl || rta >= crit.rta) {
927 status = STATE_CRITICAL;
928 }
929 else if(!status && (pl >= warn.pl || rta >= warn.rta)) {
930 status = STATE_WARNING;
931 hosts_warn++;
932 }
933 else {
934 hosts_ok++;
935 }
937 host = host->next;
938 }
939 /* this is inevitable */
940 if(!targets_alive) status = STATE_CRITICAL;
941 if(min_hosts_alive > -1) {
942 if(hosts_ok >= min_hosts_alive) status = STATE_OK;
943 else if((hosts_ok + hosts_warn) >= min_hosts_alive) status = STATE_WARNING;
944 }
945 printf("%s - ", status_string[status]);
947 host = list;
948 while(host) {
949 if(debug) puts("");
950 if(i) {
951 if(i < targets) printf(" :: ");
952 else printf("\n");
953 }
954 i++;
955 if(!host->icmp_recv) {
956 status = STATE_CRITICAL;
957 if(host->flags & FLAG_LOST_CAUSE) {
958 printf("%s: %s @ %s. rta nan, lost %d%%",
959 host->name,
960 get_icmp_error_msg(host->icmp_type, host->icmp_code),
961 inet_ntoa(host->error_addr),
962 100);
963 }
964 else { /* not marked as lost cause, so we have no flags for it */
965 printf("%s: rta nan, lost 100%%", host->name);
966 }
967 }
968 else { /* !icmp_recv */
969 printf("%s: rta %0.3fms, lost %u%%",
970 host->name, host->rta / 1000, host->pl);
971 }
973 host = host->next;
974 }
976 /* iterate once more for pretty perfparse output */
977 printf("|");
978 i = 0;
979 host = list;
980 while(host) {
981 if(debug) puts("");
982 printf("%srta=%0.3fms;%0.3f;%0.3f;0; %spl=%u%%;%u;%u;; ",
983 (targets > 1) ? host->name : "",
984 host->rta / 1000, (float)warn.rta / 1000, (float)crit.rta / 1000,
985 (targets > 1) ? host->name : "",
986 host->pl, warn.pl, crit.pl);
988 host = host->next;
989 }
991 if(min_hosts_alive > -1) {
992 if(hosts_ok >= min_hosts_alive) status = STATE_OK;
993 else if((hosts_ok + hosts_warn) >= min_hosts_alive) status = STATE_WARNING;
994 }
996 /* finish with an empty line */
997 puts("");
998 if(debug) printf("targets: %u, targets_alive: %u, hosts_ok: %u, hosts_warn: %u, min_hosts_alive: %i\n",
999 targets, targets_alive, hosts_ok, hosts_warn, min_hosts_alive);
1001 exit(status);
1002 }
1004 static u_int
1005 get_timevaldiff(struct timeval *early, struct timeval *later)
1006 {
1007 u_int ret;
1008 struct timeval now;
1010 if(!later) {
1011 gettimeofday(&now, &tz);
1012 later = &now;
1013 }
1014 if(!early) early = &prog_start;
1016 /* if early > later we return 0 so as to indicate a timeout */
1017 if(early->tv_sec > early->tv_sec ||
1018 (early->tv_sec == later->tv_sec && early->tv_usec > later->tv_usec))
1019 {
1020 return 0;
1021 }
1023 ret = (later->tv_sec - early->tv_sec) * 1000000;
1024 ret += later->tv_usec - early->tv_usec;
1026 return ret;
1027 }
1029 static int
1030 add_target_ip(char *arg, struct in_addr *in)
1031 {
1032 struct rta_host *host;
1034 /* disregard obviously stupid addresses */
1035 if(in->s_addr == INADDR_NONE || in->s_addr == INADDR_ANY)
1036 return -1;
1038 /* no point in adding two identical IP's, so don't. ;) */
1039 host = list;
1040 while(host) {
1041 if(host->saddr_in.sin_addr.s_addr == in->s_addr) {
1042 if(debug) printf("Identical IP already exists. Not adding %s\n", arg);
1043 return -1;
1044 }
1045 host = host->next;
1046 }
1048 /* add the fresh ip */
1049 host = malloc(sizeof(struct rta_host));
1050 if(!host) {
1051 crash("add_target_ip(%s, %s): malloc(%d) failed",
1052 arg, inet_ntoa(*in), sizeof(struct rta_host));
1053 }
1054 memset(host, 0, sizeof(struct rta_host));
1056 /* set the values. use calling name for output */
1057 host->name = strdup(arg);
1059 /* fill out the sockaddr_in struct */
1060 host->saddr_in.sin_family = AF_INET;
1061 host->saddr_in.sin_addr.s_addr = in->s_addr;
1063 if(!list) list = cursor = host;
1064 else cursor->next = host;
1066 cursor = host;
1067 targets++;
1069 return 0;
1070 }
1072 /* wrapper for add_target_ip */
1073 static int
1074 add_target(char *arg)
1075 {
1076 int i;
1077 struct hostent *he;
1078 struct in_addr *in, ip;
1080 /* don't resolve if we don't have to */
1081 if((ip.s_addr = inet_addr(arg)) != INADDR_NONE) {
1082 /* don't add all ip's if we were given a specific one */
1083 return add_target_ip(arg, &ip);
1084 /* he = gethostbyaddr((char *)in, sizeof(struct in_addr), AF_INET); */
1085 /* if(!he) return add_target_ip(arg, in); */
1086 }
1087 else {
1088 errno = 0;
1089 he = gethostbyname(arg);
1090 if(!he) {
1091 errno = 0;
1092 crash("Failed to resolve %s", arg);
1093 return -1;
1094 }
1095 }
1097 /* possibly add all the IP's as targets */
1098 for(i = 0; he->h_addr_list[i]; i++) {
1099 in = (struct in_addr *)he->h_addr_list[i];
1100 add_target_ip(arg, in);
1102 /* this is silly, but it works */
1103 if(mode == MODE_HOSTCHECK || mode == MODE_ALL) {
1104 printf("mode: %d\n", mode);
1105 continue;
1106 }
1107 break;
1108 }
1110 return 0;
1111 }
1112 /*
1113 * u = micro
1114 * m = milli
1115 * s = seconds
1116 * return value is in microseconds
1117 */
1118 static u_int
1119 get_timevar(const char *str)
1120 {
1121 char p, u, *ptr;
1122 unsigned int len;
1123 u_int i, d; /* integer and decimal, respectively */
1124 u_int factor = 1000; /* default to milliseconds */
1126 if(!str) return 0;
1127 len = strlen(str);
1128 if(!len) return 0;
1130 /* unit might be given as ms|m (millisec),
1131 * us|u (microsec) or just plain s, for seconds */
1132 u = p = '\0';
1133 u = str[len - 1];
1134 if(len >= 2 && !isdigit((int)str[len - 2])) p = str[len - 2];
1135 if(p && u == 's') u = p;
1136 else if(!p) p = u;
1137 if(debug > 2) printf("evaluating %s, u: %c, p: %c\n", str, u, p);
1139 if(u == 'u') factor = 1; /* microseconds */
1140 else if(u == 'm') factor = 1000; /* milliseconds */
1141 else if(u == 's') factor = 1000000; /* seconds */
1142 if(debug > 2) printf("factor is %u\n", factor);
1144 i = strtoul(str, &ptr, 0);
1145 if(!ptr || *ptr != '.' || strlen(ptr) < 2 || factor == 1)
1146 return i * factor;
1148 /* time specified in usecs can't have decimal points, so ignore them */
1149 if(factor == 1) return i;
1151 d = strtoul(ptr + 1, NULL, 0);
1153 /* d is decimal, so get rid of excess digits */
1154 while(d >= factor) d /= 10;
1156 /* the last parenthesis avoids floating point exceptions. */
1157 return ((i * factor) + (d * (factor / 10)));
1158 }
1160 /* not too good at checking errors, but it'll do (main() should barfe on -1) */
1161 static int
1162 get_threshold(char *str, threshold *th)
1163 {
1164 char *p = NULL, i = 0;
1166 if(!str || !strlen(str) || !th) return -1;
1168 /* pointer magic slims code by 10 lines. i is bof-stop on stupid libc's */
1169 p = &str[strlen(str) - 1];
1170 while(p != &str[1]) {
1171 if(*p == '%') *p = '\0';
1172 else if(*p == ',' && i) {
1173 *p = '\0'; /* reset it so get_timevar(str) works nicely later */
1174 th->pl = (unsigned char)strtoul(p+1, NULL, 0);
1175 break;
1176 }
1177 i = 1;
1178 p--;
1179 }
1180 th->rta = get_timevar(str);
1182 if(!th->rta) return -1;
1184 if(th->rta > MAXTTL * 1000000) th->rta = MAXTTL * 1000000;
1185 if(th->pl > 100) th->pl = 100;
1187 return 0;
1188 }
1190 unsigned short
1191 icmp_checksum(unsigned short *p, int n)
1192 {
1193 register unsigned short cksum;
1194 register long sum = 0;
1196 while(n > 1) {
1197 sum += *p++;
1198 n -= 2;
1199 }
1201 /* mop up the occasional odd byte */
1202 if(n == 1) sum += (unsigned char)*p;
1204 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1205 sum += (sum >> 16); /* add carry */
1206 cksum = ~sum; /* ones-complement, trunc to 16 bits */
1208 return cksum;
1209 }
1211 void
1212 print_help(void)
1213 {
1215 /*print_revision (progname, revision);*/ /* FIXME: Why? */
1217 printf ("Copyright (c) 2005 Andreas Ericsson <ae@op5.se>\n");
1218 printf (COPYRIGHT, copyright, email);
1220 printf ("\n\n");
1222 print_usage ();
1224 printf (_(UT_HELP_VRSN));
1226 printf (" %s\n", "-H");
1227 printf (" %s\n", _("specify a target"));
1228 printf (" %s\n", "-w");
1229 printf (" %s", _("warning threshold (currently "));
1230 printf ("%0.3fms,%u%%)\n", (float)warn.rta / 1000 , warn.pl / 1000);
1231 printf (" %s\n", "-c");
1232 printf (" %s", _("critical threshold (currently "));
1233 printf ("%0.3fms,%u%%)\n", (float)crit.rta, crit.pl);
1234 printf (" %s\n", "-n");
1235 printf (" %s", _("number of packets to send (currently "));
1236 printf ("%u)\n",packets);
1237 printf (" %s\n", "-i");
1238 printf (" %s", _("max packet interval (currently "));
1239 printf ("%0.3fms)\n",(float)pkt_interval / 1000);
1240 printf (" %s\n", "-I");
1241 printf (" %s", _("max target interval (currently "));
1242 printf ("%0.3fms)\n", (float)target_interval / 1000);
1243 printf (" %s\n", "-m");
1244 printf (" %s",_("number of alive hosts required for success"));
1245 printf ("\n");
1246 printf (" %s\n", "-l");
1247 printf (" %s", _("TTL on outgoing packets (currently "));
1248 printf ("%u)", ttl);
1249 printf (" %s\n", "-t");
1250 printf (" %s",_("timeout value (seconds, currently "));
1251 printf ("%u)\n", timeout);
1252 printf (" %s\n", "-b");
1253 printf (" %s\n", _("icmp packet size (currenly ignored)"));
1254 printf (" %s\n", "-v");
1255 printf (" %s\n", _("verbose"));
1257 printf ("\n");
1258 printf ("%s\n\n", _("The -H switch is optional. Naming a host (or several) to check is not."));
1259 printf ("%s\n", _("Threshold format for -w and -c is 200.25,60% for 200.25 msec RTA and 60%"));
1260 printf ("%s\n", _("packet loss. The default values should work well for most users."));
1261 printf ("%s\n", _("You can specify different RTA factors using the standardized abbreviations"));
1262 printf ("%s\n\n", _("us (microseconds), ms (milliseconds, default) or just plain s for seconds."));
1263 /* -d not yet implemented */
1264 /* printf ("%s\n", _("Threshold format for -d is warn,crit. 12,14 means WARNING if >= 12 hops"));
1265 printf ("%s\n", _("are spent and CRITICAL if >= 14 hops are spent."));
1266 printf ("%s\n\n", _("NOTE: Some systems decrease TTL when forming ICMP_ECHOREPLY, others do not."));*/
1267 printf ("%s\n\n", _("The -v switch can be specified several times for increased verbosity."));
1269 /* printf ("%s\n", _("Long options are currently unsupported."));
1270 printf ("%s\n", _("Options marked with * require an argument"));
1271 */
1272 printf (_(UT_SUPPORT));
1274 printf (_(UT_NOWARRANTY));
1275 }
1279 void
1280 print_usage (void)
1281 {
1282 printf (_("Usage:"));
1283 printf(" %s [options] [-H] host1 host2 hostn\n", progname);
1284 }