1 /*****************************************************************************
2 *
3 * Nagios check_icmp plugin
4 *
5 * License: GPL
6 * Copyright (c) 2005-2008 Nagios Plugins Development Team
7 * Original Author : Andreas Ericsson <ae@op5.se>
8 *
9 * Last Modified: $Date$
10 *
11 * Description:
12 *
13 * This file contains the check_icmp plugin
14 *
15 * Relevant RFC's: 792 (ICMP), 791 (IP)
16 *
17 * This program was modeled somewhat after the check_icmp program,
18 * which was in turn a hack of fping (www.fping.org) but has been
19 * completely rewritten since to generate higher precision rta values,
20 * and support several different modes as well as setting ttl to control.
21 * redundant routes. The only remainders of fping is currently a few
22 * function names.
23 *
24 *
25 * This program is free software: you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation, either version 3 of the License, or
28 * (at your option) any later version.
29 *
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
34 *
35 * You should have received a copy of the GNU General Public License
36 * along with this program. If not, see <http://www.gnu.org/licenses/>.
37 *
38 * $Id$
39 *
40 *****************************************************************************/
42 /* progname may change */
43 /* char *progname = "check_icmp"; */
44 char *progname;
45 const char *revision = "$Revision$";
46 const char *copyright = "2005-2008";
47 const char *email = "nagiosplug-devel@lists.sourceforge.net";
49 /** nagios plugins basic includes */
50 #include "common.h"
51 #include "netutils.h"
52 #include "utils.h"
54 #if HAVE_SYS_SOCKIO_H
55 #include <sys/sockio.h>
56 #endif
57 #include <sys/ioctl.h>
58 #include <sys/time.h>
59 #include <sys/types.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <stdarg.h>
63 #include <unistd.h>
64 #include <stddef.h>
65 #include <errno.h>
66 #include <string.h>
67 #include <ctype.h>
68 #include <netdb.h>
69 #include <sys/socket.h>
70 #include <net/if.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/in.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_icmp.h>
75 #include <arpa/inet.h>
76 #include <signal.h>
79 /** sometimes undefined system macros (quite a few, actually) **/
80 #ifndef MAXTTL
81 # define MAXTTL 255
82 #endif
83 #ifndef INADDR_NONE
84 # define INADDR_NONE (in_addr_t)(-1)
85 #endif
87 #ifndef SOL_IP
88 #define SOL_IP 0
89 #endif
91 /* we bundle these in one #ifndef, since they're all from BSD
92 * Put individual #ifndef's around those that bother you */
93 #ifndef ICMP_UNREACH_NET_UNKNOWN
94 # define ICMP_UNREACH_NET_UNKNOWN 6
95 # define ICMP_UNREACH_HOST_UNKNOWN 7
96 # define ICMP_UNREACH_ISOLATED 8
97 # define ICMP_UNREACH_NET_PROHIB 9
98 # define ICMP_UNREACH_HOST_PROHIB 10
99 # define ICMP_UNREACH_TOSNET 11
100 # define ICMP_UNREACH_TOSHOST 12
101 #endif
102 /* tru64 has the ones above, but not these */
103 #ifndef ICMP_UNREACH_FILTER_PROHIB
104 # define ICMP_UNREACH_FILTER_PROHIB 13
105 # define ICMP_UNREACH_HOST_PRECEDENCE 14
106 # define ICMP_UNREACH_PRECEDENCE_CUTOFF 15
107 #endif
109 #ifndef DBL_MAX
110 # define DBL_MAX 9.9999999999e999
111 #endif
113 typedef unsigned short range_t; /* type for get_range() -- unimplemented */
115 typedef struct rta_host {
116 unsigned short id; /* id in **table, and icmp pkts */
117 char *name; /* arg used for adding this host */
118 char *msg; /* icmp error message, if any */
119 struct sockaddr_in saddr_in; /* the address of this host */
120 struct in_addr error_addr; /* stores address of error replies */
121 unsigned long long time_waited; /* total time waited, in usecs */
122 unsigned int icmp_sent, icmp_recv, icmp_lost; /* counters */
123 unsigned char icmp_type, icmp_code; /* type and code from errors */
124 unsigned short flags; /* control/status flags */
125 double rta; /* measured RTA */
126 double rtmax; /* max rtt */
127 double rtmin; /* min rtt */
128 unsigned char pl; /* measured packet loss */
129 struct rta_host *next; /* linked list */
130 } rta_host;
132 #define FLAG_LOST_CAUSE 0x01 /* decidedly dead target. */
134 /* threshold structure. all values are maximum allowed, exclusive */
135 typedef struct threshold {
136 unsigned char pl; /* max allowed packet loss in percent */
137 unsigned int rta; /* roundtrip time average, microseconds */
138 } threshold;
140 /* the data structure */
141 typedef struct icmp_ping_data {
142 struct timeval stime; /* timestamp (saved in protocol struct as well) */
143 unsigned short ping_id;
144 } icmp_ping_data;
146 /* the different modes of this program are as follows:
147 * MODE_RTA: send all packets no matter what (mimic check_icmp and check_ping)
148 * MODE_HOSTCHECK: Return immediately upon any sign of life
149 * In addition, sends packets to ALL addresses assigned
150 * to this host (as returned by gethostbyname() or
151 * gethostbyaddr() and expects one host only to be checked at
152 * a time. Therefore, any packet response what so ever will
153 * count as a sign of life, even when received outside
154 * crit.rta limit. Do not misspell any additional IP's.
155 * MODE_ALL: Requires packets from ALL requested IP to return OK (default).
156 * MODE_ICMP: implement something similar to check_icmp (MODE_RTA without
157 * tcp and udp args does this)
158 */
159 #define MODE_RTA 0
160 #define MODE_HOSTCHECK 1
161 #define MODE_ALL 2
162 #define MODE_ICMP 3
164 /* the different ping types we can do
165 * TODO: investigate ARP ping as well */
166 #define HAVE_ICMP 1
167 #define HAVE_UDP 2
168 #define HAVE_TCP 4
169 #define HAVE_ARP 8
171 #define MIN_PING_DATA_SIZE sizeof(struct icmp_ping_data)
172 #define MAX_IP_PKT_SIZE 65536 /* (theoretical) max IP packet size */
173 #define IP_HDR_SIZE 20
174 #define MAX_PING_DATA (MAX_IP_PKT_SIZE - IP_HDR_SIZE - ICMP_MINLEN)
175 #define DEFAULT_PING_DATA_SIZE (MIN_PING_DATA_SIZE + 44)
177 /* various target states */
178 #define TSTATE_INACTIVE 0x01 /* don't ping this host anymore */
179 #define TSTATE_WAITING 0x02 /* unanswered packets on the wire */
180 #define TSTATE_ALIVE 0x04 /* target is alive (has answered something) */
181 #define TSTATE_UNREACH 0x08
183 /** prototypes **/
184 void print_help (void);
185 void print_usage (void);
186 static u_int get_timevar(const char *);
187 static u_int get_timevaldiff(struct timeval *, struct timeval *);
188 static in_addr_t get_ip_address(const char *);
189 static int wait_for_reply(int, u_int);
190 static int recvfrom_wto(int, char *, unsigned int, struct sockaddr *, u_int *);
191 static int send_icmp_ping(int, struct rta_host *);
192 static int get_threshold(char *str, threshold *th);
193 static void run_checks(void);
194 static void set_source_ip(char *);
195 static int add_target(char *);
196 static int add_target_ip(char *, struct in_addr *);
197 static int handle_random_icmp(char *, struct sockaddr_in *);
198 static unsigned short icmp_checksum(unsigned short *, int);
199 static void finish(int);
200 static void crash(const char *, ...);
202 /** external **/
203 extern int optind, opterr, optopt;
204 extern char *optarg;
205 extern char **environ;
207 /** global variables **/
208 static struct rta_host **table, *cursor, *list;
209 static threshold crit = {80, 500000}, warn = {40, 200000};
210 static int mode, protocols, sockets, debug = 0, timeout = 10;
211 static unsigned short icmp_data_size = DEFAULT_PING_DATA_SIZE;
212 static unsigned short icmp_pkt_size = DEFAULT_PING_DATA_SIZE + ICMP_MINLEN;
214 static unsigned int icmp_sent = 0, icmp_recv = 0, icmp_lost = 0;
215 #define icmp_pkts_en_route (icmp_sent - (icmp_recv + icmp_lost))
216 static unsigned short targets_down = 0, targets = 0, packets = 0;
217 #define targets_alive (targets - targets_down)
218 static unsigned int retry_interval, pkt_interval, target_interval;
219 static int icmp_sock, tcp_sock, udp_sock, status = STATE_OK;
220 static pid_t pid;
221 static struct timezone tz;
222 static struct timeval prog_start;
223 static unsigned long long max_completion_time = 0;
224 static unsigned char ttl = 0; /* outgoing ttl */
225 static unsigned int warn_down = 1, crit_down = 1; /* host down threshold values */
226 static int min_hosts_alive = -1;
227 float pkt_backoff_factor = 1.5;
228 float target_backoff_factor = 1.5;
230 /** code start **/
231 static void
232 crash(const char *fmt, ...)
233 {
234 va_list ap;
236 printf("%s: ", progname);
238 va_start(ap, fmt);
239 vprintf(fmt, ap);
240 va_end(ap);
242 if(errno) printf(": %s", strerror(errno));
243 puts("");
245 exit(3);
246 }
249 static const char *
250 get_icmp_error_msg(unsigned char icmp_type, unsigned char icmp_code)
251 {
252 const char *msg = "unreachable";
254 if(debug > 1) printf("get_icmp_error_msg(%u, %u)\n", icmp_type, icmp_code);
255 switch(icmp_type) {
256 case ICMP_UNREACH:
257 switch(icmp_code) {
258 case ICMP_UNREACH_NET: msg = "Net unreachable"; break;
259 case ICMP_UNREACH_HOST: msg = "Host unreachable"; break;
260 case ICMP_UNREACH_PROTOCOL: msg = "Protocol unreachable (firewall?)"; break;
261 case ICMP_UNREACH_PORT: msg = "Port unreachable (firewall?)"; break;
262 case ICMP_UNREACH_NEEDFRAG: msg = "Fragmentation needed"; break;
263 case ICMP_UNREACH_SRCFAIL: msg = "Source route failed"; break;
264 case ICMP_UNREACH_ISOLATED: msg = "Source host isolated"; break;
265 case ICMP_UNREACH_NET_UNKNOWN: msg = "Unknown network"; break;
266 case ICMP_UNREACH_HOST_UNKNOWN: msg = "Unknown host"; break;
267 case ICMP_UNREACH_NET_PROHIB: msg = "Network denied (firewall?)"; break;
268 case ICMP_UNREACH_HOST_PROHIB: msg = "Host denied (firewall?)"; break;
269 case ICMP_UNREACH_TOSNET: msg = "Bad TOS for network (firewall?)"; break;
270 case ICMP_UNREACH_TOSHOST: msg = "Bad TOS for host (firewall?)"; break;
271 case ICMP_UNREACH_FILTER_PROHIB: msg = "Prohibited by filter (firewall)"; break;
272 case ICMP_UNREACH_HOST_PRECEDENCE: msg = "Host precedence violation"; break;
273 case ICMP_UNREACH_PRECEDENCE_CUTOFF: msg = "Precedence cutoff"; break;
274 default: msg = "Invalid code"; break;
275 }
276 break;
278 case ICMP_TIMXCEED:
279 /* really 'out of reach', or non-existant host behind a router serving
280 * two different subnets */
281 switch(icmp_code) {
282 case ICMP_TIMXCEED_INTRANS: msg = "Time to live exceeded in transit"; break;
283 case ICMP_TIMXCEED_REASS: msg = "Fragment reassembly time exceeded"; break;
284 default: msg = "Invalid code"; break;
285 }
286 break;
288 case ICMP_SOURCEQUENCH: msg = "Transmitting too fast"; break;
289 case ICMP_REDIRECT: msg = "Redirect (change route)"; break;
290 case ICMP_PARAMPROB: msg = "Bad IP header (required option absent)"; break;
292 /* the following aren't error messages, so ignore */
293 case ICMP_TSTAMP:
294 case ICMP_TSTAMPREPLY:
295 case ICMP_IREQ:
296 case ICMP_IREQREPLY:
297 case ICMP_MASKREQ:
298 case ICMP_MASKREPLY:
299 default: msg = ""; break;
300 }
302 return msg;
303 }
305 static int
306 handle_random_icmp(char *packet, struct sockaddr_in *addr)
307 {
308 struct icmp p, sent_icmp;
309 struct rta_host *host = NULL;
311 memcpy(&p, packet, sizeof(p));
312 if(p.icmp_type == ICMP_ECHO && p.icmp_id == pid) {
313 /* echo request from us to us (pinging localhost) */
314 return 0;
315 }
317 if(debug) printf("handle_random_icmp(%p, %p)\n", (void *)&p, (void *)addr);
319 /* only handle a few types, since others can't possibly be replies to
320 * us in a sane network (if it is anyway, it will be counted as lost
321 * at summary time, but not as quickly as a proper response */
322 /* TIMXCEED can be an unreach from a router with multiple IP's which
323 * serves two different subnets on the same interface and a dead host
324 * on one net is pinged from the other. The router will respond to
325 * itself and thus set TTL=0 so as to not loop forever. Even when
326 * TIMXCEED actually sends a proper icmp response we will have passed
327 * too many hops to have a hope of reaching it later, in which case it
328 * indicates overconfidence in the network, poor routing or both. */
329 if(p.icmp_type != ICMP_UNREACH && p.icmp_type != ICMP_TIMXCEED &&
330 p.icmp_type != ICMP_SOURCEQUENCH && p.icmp_type != ICMP_PARAMPROB)
331 {
332 return 0;
333 }
335 /* might be for us. At least it holds the original package (according
336 * to RFC 792). If it isn't, just ignore it */
337 memcpy(&sent_icmp, packet + 28, sizeof(sent_icmp));
338 if(sent_icmp.icmp_type != ICMP_ECHO || sent_icmp.icmp_id != pid ||
339 sent_icmp.icmp_seq >= targets)
340 {
341 if(debug) printf("Packet is no response to a packet we sent\n");
342 return 0;
343 }
345 /* it is indeed a response for us */
346 host = table[sent_icmp.icmp_seq];
347 if(debug) {
348 printf("Received \"%s\" from %s for ICMP ECHO sent to %s.\n",
349 get_icmp_error_msg(p.icmp_type, p.icmp_code),
350 inet_ntoa(addr->sin_addr), host->name);
351 }
353 icmp_lost++;
354 host->icmp_lost++;
355 /* don't spend time on lost hosts any more */
356 if(host->flags & FLAG_LOST_CAUSE) return 0;
358 /* source quench means we're sending too fast, so increase the
359 * interval and mark this packet lost */
360 if(p.icmp_type == ICMP_SOURCEQUENCH) {
361 pkt_interval *= pkt_backoff_factor;
362 target_interval *= target_backoff_factor;
363 }
364 else {
365 targets_down++;
366 host->flags |= FLAG_LOST_CAUSE;
367 }
368 host->icmp_type = p.icmp_type;
369 host->icmp_code = p.icmp_code;
370 host->error_addr.s_addr = addr->sin_addr.s_addr;
372 return 0;
373 }
375 int
376 main(int argc, char **argv)
377 {
378 int i;
379 char *ptr;
380 long int arg;
381 int icmp_sockerrno, udp_sockerrno, tcp_sockerrno;
382 int result;
383 struct rta_host *host;
385 setlocale (LC_ALL, "");
386 bindtextdomain (PACKAGE, LOCALEDIR);
387 textdomain (PACKAGE);
389 /* print a helpful error message if geteuid != 0 */
390 np_warn_if_not_root();
392 /* we only need to be setsuid when we get the sockets, so do
393 * that before pointer magic (esp. on network data) */
394 icmp_sockerrno = udp_sockerrno = tcp_sockerrno = sockets = 0;
396 if((icmp_sock = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) != -1)
397 sockets |= HAVE_ICMP;
398 else icmp_sockerrno = errno;
400 /* if((udp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1) */
401 /* sockets |= HAVE_UDP; */
402 /* else udp_sockerrno = errno; */
404 /* if((tcp_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1) */
405 /* sockets |= HAVE_TCP; */
406 /* else tcp_sockerrno = errno; */
408 /* now drop privileges (no effect if not setsuid or geteuid() == 0) */
409 setuid(getuid());
411 /* POSIXLY_CORRECT might break things, so unset it (the portable way) */
412 environ = NULL;
414 /* use the pid to mark packets as ours */
415 /* Some systems have 32-bit pid_t so mask off only 16 bits */
416 pid = getpid() & 0xffff;
417 /* printf("pid = %u\n", pid); */
419 /* get calling name the old-fashioned way for portability instead
420 * of relying on the glibc-ism __progname */
421 ptr = strrchr(argv[0], '/');
422 if(ptr) progname = &ptr[1];
423 else progname = argv[0];
425 /* now set defaults. Use progname to set them initially (allows for
426 * superfast check_host program when target host is up */
427 cursor = list = NULL;
428 table = NULL;
430 mode = MODE_RTA;
431 crit.rta = 500000;
432 crit.pl = 80;
433 warn.rta = 200000;
434 warn.pl = 40;
435 protocols = HAVE_ICMP | HAVE_UDP | HAVE_TCP;
436 pkt_interval = 80000; /* 80 msec packet interval by default */
437 packets = 5;
439 if(!strcmp(progname, "check_icmp") || !strcmp(progname, "check_ping")) {
440 mode = MODE_ICMP;
441 protocols = HAVE_ICMP;
442 }
443 else if(!strcmp(progname, "check_host")) {
444 mode = MODE_HOSTCHECK;
445 pkt_interval = 1000000;
446 packets = 5;
447 crit.rta = warn.rta = 1000000;
448 crit.pl = warn.pl = 100;
449 }
450 else if(!strcmp(progname, "check_rta_multi")) {
451 mode = MODE_ALL;
452 target_interval = 0;
453 pkt_interval = 50000;
454 packets = 5;
455 }
457 /* Parse extra opts if any */
458 argv=np_extra_opts(&argc, argv, progname);
460 /* parse the arguments */
461 for(i = 1; i < argc; i++) {
462 while((arg = getopt(argc, argv, "vhVw:c:n:p:t:H:s:i:b:I:l:m:")) != EOF) {
463 long size;
464 switch(arg) {
465 case 'v':
466 debug++;
467 break;
468 case 'b':
469 size = strtol(optarg,NULL,0);
470 if (size >= (sizeof(struct icmp) + sizeof(struct icmp_ping_data)) &&
471 size < MAX_PING_DATA) {
472 icmp_data_size = size;
473 icmp_pkt_size = size + ICMP_MINLEN;
474 } else
475 usage_va("ICMP data length must be between: %d and %d",
476 sizeof(struct icmp) + sizeof(struct icmp_ping_data),
477 MAX_PING_DATA - 1);
479 break;
480 case 'i':
481 pkt_interval = get_timevar(optarg);
482 break;
483 case 'I':
484 target_interval = get_timevar(optarg);
485 break;
486 case 'w':
487 get_threshold(optarg, &warn);
488 break;
489 case 'c':
490 get_threshold(optarg, &crit);
491 break;
492 case 'n':
493 case 'p':
494 packets = strtoul(optarg, NULL, 0);
495 break;
496 case 't':
497 timeout = strtoul(optarg, NULL, 0);
498 if(!timeout) timeout = 10;
499 break;
500 case 'H':
501 add_target(optarg);
502 break;
503 case 'l':
504 ttl = (unsigned char)strtoul(optarg, NULL, 0);
505 break;
506 case 'm':
507 min_hosts_alive = (int)strtoul(optarg, NULL, 0);
508 break;
509 case 'd': /* implement later, for cluster checks */
510 warn_down = (unsigned char)strtoul(optarg, &ptr, 0);
511 if(ptr) {
512 crit_down = (unsigned char)strtoul(ptr + 1, NULL, 0);
513 }
514 break;
515 case 's': /* specify source IP address */
516 set_source_ip(optarg);
517 break;
518 case 'V': /* version */
519 /*print_revision (progname, revision);*/ /* FIXME: Why? */
520 exit (STATE_OK);
521 case 'h': /* help */
522 print_help ();
523 exit (STATE_OK);
524 }
525 }
526 }
528 argv = &argv[optind];
529 while(*argv) {
530 add_target(*argv);
531 argv++;
532 }
533 if(!targets) {
534 errno = 0;
535 crash("No hosts to check");
536 exit(3);
537 }
539 if(!sockets) {
540 if(icmp_sock == -1) {
541 errno = icmp_sockerrno;
542 crash("Failed to obtain ICMP socket");
543 return -1;
544 }
545 /* if(udp_sock == -1) { */
546 /* errno = icmp_sockerrno; */
547 /* crash("Failed to obtain UDP socket"); */
548 /* return -1; */
549 /* } */
550 /* if(tcp_sock == -1) { */
551 /* errno = icmp_sockerrno; */
552 /* crash("Failed to obtain TCP socker"); */
553 /* return -1; */
554 /* } */
555 }
556 if(!ttl) ttl = 64;
558 if(icmp_sock) {
559 result = setsockopt(icmp_sock, SOL_IP, IP_TTL, &ttl, sizeof(ttl));
560 if(debug) {
561 if(result == -1) printf("setsockopt failed\n");
562 else printf("ttl set to %u\n", ttl);
563 }
564 }
566 /* stupid users should be able to give whatever thresholds they want
567 * (nothing will break if they do), but some anal plugin maintainer
568 * will probably add some printf() thing here later, so it might be
569 * best to at least show them where to do it. ;) */
570 if(warn.pl > crit.pl) warn.pl = crit.pl;
571 if(warn.rta > crit.rta) warn.rta = crit.rta;
572 if(warn_down > crit_down) crit_down = warn_down;
574 signal(SIGINT, finish);
575 signal(SIGHUP, finish);
576 signal(SIGTERM, finish);
577 signal(SIGALRM, finish);
578 if(debug) printf("Setting alarm timeout to %u seconds\n", timeout);
579 alarm(timeout);
581 /* make sure we don't wait any longer than necessary */
582 gettimeofday(&prog_start, &tz);
583 max_completion_time =
584 ((targets * packets * pkt_interval) + (targets * target_interval)) +
585 (targets * packets * crit.rta) + crit.rta;
587 if(debug) {
588 printf("packets: %u, targets: %u\n"
589 "target_interval: %0.3f, pkt_interval %0.3f\n"
590 "crit.rta: %0.3f\n"
591 "max_completion_time: %0.3f\n",
592 packets, targets,
593 (float)target_interval / 1000, (float)pkt_interval / 1000,
594 (float)crit.rta / 1000,
595 (float)max_completion_time / 1000);
596 }
598 if(debug) {
599 if(max_completion_time > (u_int)timeout * 1000000) {
600 printf("max_completion_time: %llu timeout: %u\n",
601 max_completion_time, timeout);
602 printf("Timout must be at lest %llu\n",
603 max_completion_time / 1000000 + 1);
604 }
605 }
607 if(debug) {
608 printf("crit = {%u, %u%%}, warn = {%u, %u%%}\n",
609 crit.rta, crit.pl, warn.rta, warn.pl);
610 printf("pkt_interval: %u target_interval: %u retry_interval: %u\n",
611 pkt_interval, target_interval, retry_interval);
612 printf("icmp_pkt_size: %u timeout: %u\n",
613 icmp_pkt_size, timeout);
614 }
616 if(packets > 20) {
617 errno = 0;
618 crash("packets is > 20 (%d)", packets);
619 }
621 if(min_hosts_alive < -1) {
622 errno = 0;
623 crash("minimum alive hosts is negative (%i)", min_hosts_alive);
624 }
626 host = list;
627 table = malloc(sizeof(struct rta_host **) * (argc - 1));
628 i = 0;
629 while(host) {
630 host->id = i;
631 table[i] = host;
632 host = host->next;
633 i++;
634 }
636 run_checks();
638 errno = 0;
639 finish(0);
641 return(0);
642 }
644 static void
645 run_checks()
646 {
647 u_int i, t, result;
648 u_int final_wait, time_passed;
650 /* this loop might actually violate the pkt_interval or target_interval
651 * settings, but only if there aren't any packets on the wire which
652 * indicates that the target can handle an increased packet rate */
653 for(i = 0; i < packets; i++) {
654 for(t = 0; t < targets; t++) {
655 /* don't send useless packets */
656 if(!targets_alive) finish(0);
657 if(table[t]->flags & FLAG_LOST_CAUSE) {
658 if(debug) printf("%s is a lost cause. not sending any more\n",
659 table[t]->name);
660 continue;
661 }
663 /* we're still in the game, so send next packet */
664 (void)send_icmp_ping(icmp_sock, table[t]);
665 result = wait_for_reply(icmp_sock, target_interval);
666 }
667 result = wait_for_reply(icmp_sock, pkt_interval * targets);
668 }
670 if(icmp_pkts_en_route && targets_alive) {
671 time_passed = get_timevaldiff(NULL, NULL);
672 final_wait = max_completion_time - time_passed;
674 if(debug) {
675 printf("time_passed: %u final_wait: %u max_completion_time: %llu\n",
676 time_passed, final_wait, max_completion_time);
677 }
678 if(time_passed > max_completion_time) {
679 if(debug) printf("Time passed. Finishing up\n");
680 finish(0);
681 }
683 /* catch the packets that might come in within the timeframe, but
684 * haven't yet */
685 if(debug) printf("Waiting for %u micro-seconds (%0.3f msecs)\n",
686 final_wait, (float)final_wait / 1000);
687 result = wait_for_reply(icmp_sock, final_wait);
688 }
689 }
691 /* response structure:
692 * ip header : 20 bytes
693 * icmp header : 28 bytes
694 * icmp echo reply : the rest
695 */
696 static int
697 wait_for_reply(int sock, u_int t)
698 {
699 int n, hlen;
700 static char buf[4096];
701 struct sockaddr_in resp_addr;
702 struct ip *ip;
703 struct icmp icp;
704 struct rta_host *host;
705 struct icmp_ping_data data;
706 struct timeval wait_start, now;
707 u_int tdiff, i, per_pkt_wait;
709 /* if we can't listen or don't have anything to listen to, just return */
710 if(!t || !icmp_pkts_en_route) return 0;
712 gettimeofday(&wait_start, &tz);
714 i = t;
715 per_pkt_wait = t / icmp_pkts_en_route;
716 while(icmp_pkts_en_route && get_timevaldiff(&wait_start, NULL) < i) {
717 t = per_pkt_wait;
719 /* wrap up if all targets are declared dead */
720 if(!targets_alive ||
721 get_timevaldiff(&prog_start, NULL) >= max_completion_time ||
722 (mode == MODE_HOSTCHECK && targets_down))
723 {
724 finish(0);
725 }
727 /* reap responses until we hit a timeout */
728 n = recvfrom_wto(sock, buf, sizeof(buf),
729 (struct sockaddr *)&resp_addr, &t);
730 if(!n) {
731 if(debug > 1) {
732 printf("recvfrom_wto() timed out during a %u usecs wait\n",
733 per_pkt_wait);
734 }
735 continue; /* timeout for this one, so keep trying */
736 }
737 if(n < 0) {
738 if(debug) printf("recvfrom_wto() returned errors\n");
739 return n;
740 }
742 ip = (struct ip *)buf;
743 if(debug > 1) printf("received %u bytes from %s\n",
744 ntohs(ip->ip_len), inet_ntoa(resp_addr.sin_addr));
746 /* obsolete. alpha on tru64 provides the necessary defines, but isn't broken */
747 /* #if defined( __alpha__ ) && __STDC__ && !defined( __GLIBC__ ) */
748 /* alpha headers are decidedly broken. Using an ansi compiler,
749 * they provide ip_vhl instead of ip_hl and ip_v, so we mask
750 * off the bottom 4 bits */
751 /* hlen = (ip->ip_vhl & 0x0f) << 2; */
752 /* #else */
753 hlen = ip->ip_hl << 2;
754 /* #endif */
756 if(n < (hlen + ICMP_MINLEN)) {
757 crash("received packet too short for ICMP (%d bytes, expected %d) from %s\n",
758 n, hlen + icmp_pkt_size, inet_ntoa(resp_addr.sin_addr));
759 }
760 /* else if(debug) { */
761 /* printf("ip header size: %u, packet size: %u (expected %u, %u)\n", */
762 /* hlen, ntohs(ip->ip_len) - hlen, */
763 /* sizeof(struct ip), icmp_pkt_size); */
764 /* } */
766 /* check the response */
767 memcpy(&icp, buf + hlen, sizeof(icp));
769 if(icp.icmp_id != pid) {
770 handle_random_icmp(buf + hlen, &resp_addr);
771 continue;
772 }
774 if(icp.icmp_type != ICMP_ECHOREPLY || icp.icmp_seq >= targets) {
775 if(debug > 2) printf("not a proper ICMP_ECHOREPLY\n");
776 handle_random_icmp(buf + hlen, &resp_addr);
777 continue;
778 }
780 /* this is indeed a valid response */
781 memcpy(&data, icp.icmp_data, sizeof(data));
783 host = table[icp.icmp_seq];
784 gettimeofday(&now, &tz);
785 tdiff = get_timevaldiff(&data.stime, &now);
787 host->time_waited += tdiff;
788 host->icmp_recv++;
789 icmp_recv++;
790 if (tdiff > host->rtmax)
791 host->rtmax = tdiff;
792 if (tdiff < host->rtmin)
793 host->rtmin = tdiff;
795 if(debug) {
796 printf("%0.3f ms rtt from %s, outgoing ttl: %u, incoming ttl: %u, max: %0.3f, min: %0.3f\n",
797 (float)tdiff / 1000, inet_ntoa(resp_addr.sin_addr),
798 ttl, ip->ip_ttl, (float)host->rtmax / 1000, (float)host->rtmin / 1000);
799 }
801 /* if we're in hostcheck mode, exit with limited printouts */
802 if(mode == MODE_HOSTCHECK) {
803 printf("OK - %s responds to ICMP. Packet %u, rta %0.3fms|"
804 "pkt=%u;;0;%u rta=%0.3f;%0.3f;%0.3f;;\n",
805 host->name, icmp_recv, (float)tdiff / 1000,
806 icmp_recv, packets, (float)tdiff / 1000,
807 (float)warn.rta / 1000, (float)crit.rta / 1000);
808 exit(STATE_OK);
809 }
810 }
812 return 0;
813 }
815 /* the ping functions */
816 static int
817 send_icmp_ping(int sock, struct rta_host *host)
818 {
819 static union {
820 char *buf; /* re-use so we prevent leaks */
821 struct icmp *icp;
822 u_short *cksum_in;
823 } packet = { NULL };
824 long int len;
825 struct icmp_ping_data data;
826 struct timeval tv;
827 struct sockaddr *addr;
829 if(sock == -1) {
830 errno = 0;
831 crash("Attempt to send on bogus socket");
832 return -1;
833 }
834 addr = (struct sockaddr *)&host->saddr_in;
836 if(!packet.buf) {
837 if (!(packet.buf = malloc(icmp_pkt_size))) {
838 crash("send_icmp_ping(): failed to malloc %d bytes for send buffer",
839 icmp_pkt_size);
840 return -1; /* might be reached if we're in debug mode */
841 }
842 }
843 memset(packet.buf, 0, icmp_pkt_size);
845 if((gettimeofday(&tv, &tz)) == -1) return -1;
847 data.ping_id = 10; /* host->icmp.icmp_sent; */
848 memcpy(&data.stime, &tv, sizeof(tv));
849 memcpy(&packet.icp->icmp_data, &data, sizeof(data));
850 packet.icp->icmp_type = ICMP_ECHO;
851 packet.icp->icmp_code = 0;
852 packet.icp->icmp_cksum = 0;
853 packet.icp->icmp_id = pid;
854 packet.icp->icmp_seq = host->id;
855 packet.icp->icmp_cksum = icmp_checksum(packet.cksum_in, icmp_pkt_size);
857 len = sendto(sock, packet.buf, icmp_pkt_size, 0, (struct sockaddr *)addr,
858 sizeof(struct sockaddr));
860 if(len < 0 || (unsigned int)len != icmp_pkt_size) {
861 if(debug) printf("Failed to send ping to %s\n",
862 inet_ntoa(host->saddr_in.sin_addr));
863 return -1;
864 }
866 icmp_sent++;
867 host->icmp_sent++;
869 return 0;
870 }
872 static int
873 recvfrom_wto(int sock, char *buf, unsigned int len, struct sockaddr *saddr,
874 u_int *timo)
875 {
876 u_int slen;
877 int n;
878 struct timeval to, then, now;
879 fd_set rd, wr;
881 if(!*timo) {
882 if(debug) printf("*timo is not\n");
883 return 0;
884 }
886 to.tv_sec = *timo / 1000000;
887 to.tv_usec = (*timo - (to.tv_sec * 1000000));
889 FD_ZERO(&rd);
890 FD_ZERO(&wr);
891 FD_SET(sock, &rd);
892 errno = 0;
893 gettimeofday(&then, &tz);
894 n = select(sock + 1, &rd, &wr, NULL, &to);
895 if(n < 0) crash("select() in recvfrom_wto");
896 gettimeofday(&now, &tz);
897 *timo = get_timevaldiff(&then, &now);
899 if(!n) return 0; /* timeout */
901 slen = sizeof(struct sockaddr);
903 return recvfrom(sock, buf, len, 0, saddr, &slen);
904 }
906 static void
907 finish(int sig)
908 {
909 u_int i = 0;
910 unsigned char pl;
911 double rta;
912 struct rta_host *host;
913 const char *status_string[] =
914 {"OK", "WARNING", "CRITICAL", "UNKNOWN", "DEPENDENT"};
915 int hosts_ok = 0;
916 int hosts_warn = 0;
918 alarm(0);
919 if(debug > 1) printf("finish(%d) called\n", sig);
921 if(icmp_sock != -1) close(icmp_sock);
922 if(udp_sock != -1) close(udp_sock);
923 if(tcp_sock != -1) close(tcp_sock);
925 if(debug) {
926 printf("icmp_sent: %u icmp_recv: %u icmp_lost: %u\n",
927 icmp_sent, icmp_recv, icmp_lost);
928 printf("targets: %u targets_alive: %u\n", targets, targets_alive);
929 }
931 /* iterate thrice to calculate values, give output, and print perfparse */
932 host = list;
933 while(host) {
934 if(!host->icmp_recv) {
935 /* rta 0 is ofcourse not entirely correct, but will still show up
936 * conspicuosly as missing entries in perfparse and cacti */
937 pl = 100;
938 rta = 0;
939 status = STATE_CRITICAL;
940 /* up the down counter if not already counted */
941 if(!(host->flags & FLAG_LOST_CAUSE) && targets_alive) targets_down++;
942 }
943 else {
944 pl = ((host->icmp_sent - host->icmp_recv) * 100) / host->icmp_sent;
945 rta = (double)host->time_waited / host->icmp_recv;
946 }
947 host->pl = pl;
948 host->rta = rta;
949 if(pl >= crit.pl || rta >= crit.rta) {
950 status = STATE_CRITICAL;
951 }
952 else if(!status && (pl >= warn.pl || rta >= warn.rta)) {
953 status = STATE_WARNING;
954 hosts_warn++;
955 }
956 else {
957 hosts_ok++;
958 }
960 host = host->next;
961 }
962 /* this is inevitable */
963 if(!targets_alive) status = STATE_CRITICAL;
964 if(min_hosts_alive > -1) {
965 if(hosts_ok >= min_hosts_alive) status = STATE_OK;
966 else if((hosts_ok + hosts_warn) >= min_hosts_alive) status = STATE_WARNING;
967 }
968 printf("%s - ", status_string[status]);
970 host = list;
971 while(host) {
972 if(debug) puts("");
973 if(i) {
974 if(i < targets) printf(" :: ");
975 else printf("\n");
976 }
977 i++;
978 if(!host->icmp_recv) {
979 status = STATE_CRITICAL;
980 if(host->flags & FLAG_LOST_CAUSE) {
981 printf("%s: %s @ %s. rta nan, lost %d%%",
982 host->name,
983 get_icmp_error_msg(host->icmp_type, host->icmp_code),
984 inet_ntoa(host->error_addr),
985 100);
986 }
987 else { /* not marked as lost cause, so we have no flags for it */
988 printf("%s: rta nan, lost 100%%", host->name);
989 }
990 }
991 else { /* !icmp_recv */
992 printf("%s: rta %0.3fms, lost %u%%",
993 host->name, host->rta / 1000, host->pl);
994 }
996 host = host->next;
997 }
999 /* iterate once more for pretty perfparse output */
1000 printf("|");
1001 i = 0;
1002 host = list;
1003 while(host) {
1004 if(debug) puts("");
1005 printf("%srta=%0.3fms;%0.3f;%0.3f;0; %spl=%u%%;%u;%u;; %srtmax=%0.3fms;;;; %srtmin=%0.3fms;;;; ",
1006 (targets > 1) ? host->name : "",
1007 host->rta / 1000, (float)warn.rta / 1000, (float)crit.rta / 1000,
1008 (targets > 1) ? host->name : "", host->pl, warn.pl, crit.pl,
1009 (targets > 1) ? host->name : "", (float)host->rtmax / 1000,
1010 (targets > 1) ? host->name : "", (host->rtmin < DBL_MAX) ? (float)host->rtmin / 1000 : (float)0);
1012 host = host->next;
1013 }
1015 if(min_hosts_alive > -1) {
1016 if(hosts_ok >= min_hosts_alive) status = STATE_OK;
1017 else if((hosts_ok + hosts_warn) >= min_hosts_alive) status = STATE_WARNING;
1018 }
1020 /* finish with an empty line */
1021 puts("");
1022 if(debug) printf("targets: %u, targets_alive: %u, hosts_ok: %u, hosts_warn: %u, min_hosts_alive: %i\n",
1023 targets, targets_alive, hosts_ok, hosts_warn, min_hosts_alive);
1025 exit(status);
1026 }
1028 static u_int
1029 get_timevaldiff(struct timeval *early, struct timeval *later)
1030 {
1031 u_int ret;
1032 struct timeval now;
1034 if(!later) {
1035 gettimeofday(&now, &tz);
1036 later = &now;
1037 }
1038 if(!early) early = &prog_start;
1040 /* if early > later we return 0 so as to indicate a timeout */
1041 if(early->tv_sec > early->tv_sec ||
1042 (early->tv_sec == later->tv_sec && early->tv_usec > later->tv_usec))
1043 {
1044 return 0;
1045 }
1047 ret = (later->tv_sec - early->tv_sec) * 1000000;
1048 ret += later->tv_usec - early->tv_usec;
1050 return ret;
1051 }
1053 static int
1054 add_target_ip(char *arg, struct in_addr *in)
1055 {
1056 struct rta_host *host;
1058 /* disregard obviously stupid addresses */
1059 if(in->s_addr == INADDR_NONE || in->s_addr == INADDR_ANY)
1060 return -1;
1062 /* no point in adding two identical IP's, so don't. ;) */
1063 host = list;
1064 while(host) {
1065 if(host->saddr_in.sin_addr.s_addr == in->s_addr) {
1066 if(debug) printf("Identical IP already exists. Not adding %s\n", arg);
1067 return -1;
1068 }
1069 host = host->next;
1070 }
1072 /* add the fresh ip */
1073 host = malloc(sizeof(struct rta_host));
1074 if(!host) {
1075 crash("add_target_ip(%s, %s): malloc(%d) failed",
1076 arg, inet_ntoa(*in), sizeof(struct rta_host));
1077 }
1078 memset(host, 0, sizeof(struct rta_host));
1080 /* set the values. use calling name for output */
1081 host->name = strdup(arg);
1083 /* fill out the sockaddr_in struct */
1084 host->saddr_in.sin_family = AF_INET;
1085 host->saddr_in.sin_addr.s_addr = in->s_addr;
1087 host->rtmin = DBL_MAX;
1089 if(!list) list = cursor = host;
1090 else cursor->next = host;
1092 cursor = host;
1093 targets++;
1095 return 0;
1096 }
1098 /* wrapper for add_target_ip */
1099 static int
1100 add_target(char *arg)
1101 {
1102 int i;
1103 struct hostent *he;
1104 struct in_addr *in, ip;
1106 /* don't resolve if we don't have to */
1107 if((ip.s_addr = inet_addr(arg)) != INADDR_NONE) {
1108 /* don't add all ip's if we were given a specific one */
1109 return add_target_ip(arg, &ip);
1110 /* he = gethostbyaddr((char *)in, sizeof(struct in_addr), AF_INET); */
1111 /* if(!he) return add_target_ip(arg, in); */
1112 }
1113 else {
1114 errno = 0;
1115 he = gethostbyname(arg);
1116 if(!he) {
1117 errno = 0;
1118 crash("Failed to resolve %s", arg);
1119 return -1;
1120 }
1121 }
1123 /* possibly add all the IP's as targets */
1124 for(i = 0; he->h_addr_list[i]; i++) {
1125 in = (struct in_addr *)he->h_addr_list[i];
1126 add_target_ip(arg, in);
1128 /* this is silly, but it works */
1129 if(mode == MODE_HOSTCHECK || mode == MODE_ALL) {
1130 if(debug > 2) printf("mode: %d\n", mode);
1131 continue;
1132 }
1133 break;
1134 }
1136 return 0;
1137 }
1139 static void
1140 set_source_ip(char *arg)
1141 {
1142 struct sockaddr_in src;
1144 memset(&src, 0, sizeof(src));
1145 src.sin_family = AF_INET;
1146 if((src.sin_addr.s_addr = inet_addr(arg)) == INADDR_NONE)
1147 src.sin_addr.s_addr = get_ip_address(arg);
1148 if(bind(icmp_sock, (struct sockaddr *)&src, sizeof(src)) == -1)
1149 crash("Cannot bind to IP address %s", arg);
1150 }
1152 /* TODO: Move this to netutils.c and also change check_dhcp to use that. */
1153 static in_addr_t
1154 get_ip_address(const char *ifname)
1155 {
1156 #if defined(SIOCGIFADDR)
1157 struct ifreq ifr;
1158 struct sockaddr_in ip;
1160 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
1161 ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
1162 if(ioctl(icmp_sock, SIOCGIFADDR, &ifr) == -1)
1163 crash("Cannot determine IP address of interface %s", ifname);
1164 memcpy(&ip, &ifr.ifr_addr, sizeof(ip));
1165 return ip.sin_addr.s_addr;
1166 #else
1167 errno = 0;
1168 crash("Cannot get interface IP address on this platform.");
1169 #endif
1170 }
1172 /*
1173 * u = micro
1174 * m = milli
1175 * s = seconds
1176 * return value is in microseconds
1177 */
1178 static u_int
1179 get_timevar(const char *str)
1180 {
1181 char p, u, *ptr;
1182 unsigned int len;
1183 u_int i, d; /* integer and decimal, respectively */
1184 u_int factor = 1000; /* default to milliseconds */
1186 if(!str) return 0;
1187 len = strlen(str);
1188 if(!len) return 0;
1190 /* unit might be given as ms|m (millisec),
1191 * us|u (microsec) or just plain s, for seconds */
1192 u = p = '\0';
1193 u = str[len - 1];
1194 if(len >= 2 && !isdigit((int)str[len - 2])) p = str[len - 2];
1195 if(p && u == 's') u = p;
1196 else if(!p) p = u;
1197 if(debug > 2) printf("evaluating %s, u: %c, p: %c\n", str, u, p);
1199 if(u == 'u') factor = 1; /* microseconds */
1200 else if(u == 'm') factor = 1000; /* milliseconds */
1201 else if(u == 's') factor = 1000000; /* seconds */
1202 if(debug > 2) printf("factor is %u\n", factor);
1204 i = strtoul(str, &ptr, 0);
1205 if(!ptr || *ptr != '.' || strlen(ptr) < 2 || factor == 1)
1206 return i * factor;
1208 /* time specified in usecs can't have decimal points, so ignore them */
1209 if(factor == 1) return i;
1211 d = strtoul(ptr + 1, NULL, 0);
1213 /* d is decimal, so get rid of excess digits */
1214 while(d >= factor) d /= 10;
1216 /* the last parenthesis avoids floating point exceptions. */
1217 return ((i * factor) + (d * (factor / 10)));
1218 }
1220 /* not too good at checking errors, but it'll do (main() should barfe on -1) */
1221 static int
1222 get_threshold(char *str, threshold *th)
1223 {
1224 char *p = NULL, i = 0;
1226 if(!str || !strlen(str) || !th) return -1;
1228 /* pointer magic slims code by 10 lines. i is bof-stop on stupid libc's */
1229 p = &str[strlen(str) - 1];
1230 while(p != &str[1]) {
1231 if(*p == '%') *p = '\0';
1232 else if(*p == ',' && i) {
1233 *p = '\0'; /* reset it so get_timevar(str) works nicely later */
1234 th->pl = (unsigned char)strtoul(p+1, NULL, 0);
1235 break;
1236 }
1237 i = 1;
1238 p--;
1239 }
1240 th->rta = get_timevar(str);
1242 if(!th->rta) return -1;
1244 if(th->rta > MAXTTL * 1000000) th->rta = MAXTTL * 1000000;
1245 if(th->pl > 100) th->pl = 100;
1247 return 0;
1248 }
1250 unsigned short
1251 icmp_checksum(unsigned short *p, int n)
1252 {
1253 register unsigned short cksum;
1254 register long sum = 0;
1256 while(n > 1) {
1257 sum += *p++;
1258 n -= 2;
1259 }
1261 /* mop up the occasional odd byte */
1262 if(n == 1) sum += (unsigned char)*p;
1264 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1265 sum += (sum >> 16); /* add carry */
1266 cksum = ~sum; /* ones-complement, trunc to 16 bits */
1268 return cksum;
1269 }
1271 void
1272 print_help(void)
1273 {
1275 /*print_revision (progname, revision);*/ /* FIXME: Why? */
1277 printf ("Copyright (c) 2005 Andreas Ericsson <ae@op5.se>\n");
1278 printf (COPYRIGHT, copyright, email);
1280 printf ("\n\n");
1282 print_usage ();
1284 printf (_(UT_HELP_VRSN));
1285 printf (_(UT_EXTRA_OPTS));
1287 printf (" %s\n", "-H");
1288 printf (" %s\n", _("specify a target"));
1289 printf (" %s\n", "-w");
1290 printf (" %s", _("warning threshold (currently "));
1291 printf ("%0.3fms,%u%%)\n", (float)warn.rta / 1000 , warn.pl / 1000);
1292 printf (" %s\n", "-c");
1293 printf (" %s", _("critical threshold (currently "));
1294 printf ("%0.3fms,%u%%)\n", (float)crit.rta, crit.pl);
1295 printf (" %s\n", "-s");
1296 printf (" %s\n", _("specify a source IP address or device name"));
1297 printf (" %s\n", "-n");
1298 printf (" %s", _("number of packets to send (currently "));
1299 printf ("%u)\n",packets);
1300 printf (" %s\n", "-i");
1301 printf (" %s", _("max packet interval (currently "));
1302 printf ("%0.3fms)\n",(float)pkt_interval / 1000);
1303 printf (" %s\n", "-I");
1304 printf (" %s", _("max target interval (currently "));
1305 printf ("%0.3fms)\n", (float)target_interval / 1000);
1306 printf (" %s\n", "-m");
1307 printf (" %s",_("number of alive hosts required for success"));
1308 printf ("\n");
1309 printf (" %s\n", "-l");
1310 printf (" %s", _("TTL on outgoing packets (currently "));
1311 printf ("%u)\n", ttl);
1312 printf (" %s\n", "-t");
1313 printf (" %s",_("timeout value (seconds, currently "));
1314 printf ("%u)\n", timeout);
1315 printf (" %s\n", "-b");
1316 printf (" %s\n", _("Number of icmp data bytes to send"));
1317 printf (" %s %u + %d)\n", _("Packet size will be data bytes + icmp header (currently"),icmp_data_size, ICMP_MINLEN);
1318 printf (" %s\n", "-v");
1319 printf (" %s\n", _("verbose"));
1321 printf ("\n");
1322 printf ("%s\n", _("Notes:"));
1323 printf (" %s\n", _("The -H switch is optional. Naming a host (or several) to check is not."));
1324 printf ("\n");
1325 printf (" %s\n", _("Threshold format for -w and -c is 200.25,60% for 200.25 msec RTA and 60%"));
1326 printf (" %s\n", _("packet loss. The default values should work well for most users."));
1327 printf (" %s\n", _("You can specify different RTA factors using the standardized abbreviations"));
1328 printf (" %s\n", _("us (microseconds), ms (milliseconds, default) or just plain s for seconds."));
1329 /* -d not yet implemented */
1330 /* printf ("%s\n", _("Threshold format for -d is warn,crit. 12,14 means WARNING if >= 12 hops"));
1331 printf ("%s\n", _("are spent and CRITICAL if >= 14 hops are spent."));
1332 printf ("%s\n\n", _("NOTE: Some systems decrease TTL when forming ICMP_ECHOREPLY, others do not."));*/
1333 printf ("\n");
1334 printf (" %s\n", _("The -v switch can be specified several times for increased verbosity."));
1335 /* printf ("%s\n", _("Long options are currently unsupported."));
1336 printf ("%s\n", _("Options marked with * require an argument"));
1337 */
1338 #ifdef NP_EXTRA_OPTS
1339 printf ("\n");
1340 printf (_(UT_EXTRA_OPTS_NOTES));
1341 #endif
1343 printf (_(UT_SUPPORT));
1344 }
1348 void
1349 print_usage (void)
1350 {
1351 printf (_("Usage:"));
1352 printf(" %s [options] [-H] host1 host2 hostN\n", progname);
1353 }