plugins-root/check_icmp.c

   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 *****************************************************************************/
  44
  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";
  51
  52 /** nagios plugins basic includes */
  53 #include "common.h"
  54 #include "netutils.h"
  55 #include "utils.h"
  56
  57 #if HAVE_SYS_SOCKIO_H
  58 #include <sys/sockio.h>
  59 #endif
  60 #include <sys/ioctl.h>
  61 #include <sys/time.h>
  62 #include <sys/types.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <stdarg.h>
  66 #include <unistd.h>
  67 #include <stddef.h>
  68 #include <errno.h>
  69 #include <string.h>
  70 #include <ctype.h>
  71 #include <netdb.h>
  72 #include <sys/socket.h>
  73 #include <net/if.h>
  74 #include <netinet/in_systm.h>
  75 #include <netinet/in.h>
  76 #include <netinet/ip.h>
  77 #include <netinet/ip_icmp.h>
  78 #include <arpa/inet.h>
  79 #include <signal.h>
  80
  81
  82 /** sometimes undefined system macros (quite a few, actually) **/
  83 #ifndef MAXTTL
  84 # define MAXTTL 255
  85 #endif
  86 #ifndef INADDR_NONE
  87 # define INADDR_NONE (in_addr_t)(-1)
  88 #endif
  89
  90 #ifndef SOL_IP
  91 #define SOL_IP 0
  92 #endif
  93
  94 /* we bundle these in one #ifndef, since they're all from BSD
  95  * Put individual #ifndef's around those that bother you */
  96 #ifndef ICMP_UNREACH_NET_UNKNOWN
  97 # define ICMP_UNREACH_NET_UNKNOWN 6
  98 # define ICMP_UNREACH_HOST_UNKNOWN 7
  99 # define ICMP_UNREACH_ISOLATED 8
 100 # define ICMP_UNREACH_NET_PROHIB 9
 101 # define ICMP_UNREACH_HOST_PROHIB 10
 102 # define ICMP_UNREACH_TOSNET 11
 103 # define ICMP_UNREACH_TOSHOST 12
 104 #endif
 105 /* tru64 has the ones above, but not these */
 106 #ifndef ICMP_UNREACH_FILTER_PROHIB
 107 # define ICMP_UNREACH_FILTER_PROHIB 13
 108 # define ICMP_UNREACH_HOST_PRECEDENCE 14
 109 # define ICMP_UNREACH_PRECEDENCE_CUTOFF 15
 110 #endif
 111
 112
 113 typedef unsigned short range_t;  /* type for get_range() -- unimplemented */
 114
 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         unsigned char pl;            /* measured packet loss */
 127         struct rta_host *next;       /* linked list */
 128 } rta_host;
 129
 130 #define FLAG_LOST_CAUSE 0x01  /* decidedly dead target. */
 131
 132 /* threshold structure. all values are maximum allowed, exclusive */
 133 typedef struct threshold {
 134         unsigned char pl;    /* max allowed packet loss in percent */
 135         unsigned int rta;  /* roundtrip time average, microseconds */
 136 } threshold;
 137
 138 /* the data structure */
 139 typedef struct icmp_ping_data {
 140         struct timeval stime;   /* timestamp (saved in protocol struct as well) */
 141         unsigned short ping_id;
 142 } icmp_ping_data;
 143
 144 /* the different modes of this program are as follows:
 145  * MODE_RTA: send all packets no matter what (mimic check_icmp and check_ping)
 146  * MODE_HOSTCHECK: Return immediately upon any sign of life
 147  *                 In addition, sends packets to ALL addresses assigned
 148  *                 to this host (as returned by gethostbyname() or
 149  *                 gethostbyaddr() and expects one host only to be checked at
 150  *                 a time.  Therefore, any packet response what so ever will
 151  *                 count as a sign of life, even when received outside
 152  *                 crit.rta limit. Do not misspell any additional IP's.
 153  * MODE_ALL:  Requires packets from ALL requested IP to return OK (default).
 154  * MODE_ICMP: implement something similar to check_icmp (MODE_RTA without
 155  *            tcp and udp args does this)
 156  */
 157 #define MODE_RTA 0
 158 #define MODE_HOSTCHECK 1
 159 #define MODE_ALL 2
 160 #define MODE_ICMP 3
 161
 162 /* the different ping types we can do
 163  * TODO: investigate ARP ping as well */
 164 #define HAVE_ICMP 1
 165 #define HAVE_UDP 2
 166 #define HAVE_TCP 4
 167 #define HAVE_ARP 8
 168
 169 #define MIN_PING_DATA_SIZE sizeof(struct icmp_ping_data)
 170 #define MAX_IP_PKT_SIZE 65536   /* (theoretical) max IP packet size */
 171 #define IP_HDR_SIZE 20
 172 #define MAX_PING_DATA (MAX_IP_PKT_SIZE - IP_HDR_SIZE - ICMP_MINLEN)
 173 #define DEFAULT_PING_DATA_SIZE (MIN_PING_DATA_SIZE + 44)
 174
 175 /* various target states */
 176 #define TSTATE_INACTIVE 0x01    /* don't ping this host anymore */
 177 #define TSTATE_WAITING 0x02             /* unanswered packets on the wire */
 178 #define TSTATE_ALIVE 0x04       /* target is alive (has answered something) */
 179 #define TSTATE_UNREACH 0x08
 180
 181 /** prototypes **/
 182 void print_help (void);
 183 void print_usage (void);
 184 static u_int get_timevar(const char *);
 185 static u_int get_timevaldiff(struct timeval *, struct timeval *);
 186 static in_addr_t get_ip_address(const char *);
 187 static int wait_for_reply(int, u_int);
 188 static int recvfrom_wto(int, char *, unsigned int, struct sockaddr *, u_int *);
 189 static int send_icmp_ping(int, struct rta_host *);
 190 static int get_threshold(char *str, threshold *th);
 191 static void run_checks(void);
 192 static void set_source_ip(char *);
 193 static int add_target(char *);
 194 static int add_target_ip(char *, struct in_addr *);
 195 static int handle_random_icmp(char *, struct sockaddr_in *);
 196 static unsigned short icmp_checksum(unsigned short *, int);
 197 static void finish(int);
 198 static void crash(const char *, ...);
 199
 200 /** external **/
 201 extern int optind, opterr, optopt;
 202 extern char *optarg;
 203 extern char **environ;
 204
 205 /** global variables **/
 206 static struct rta_host **table, *cursor, *list;
 207 static threshold crit = {80, 500000}, warn = {40, 200000};
 208 static int mode, protocols, sockets, debug = 0, timeout = 10;
 209 static unsigned short icmp_pkt_size, icmp_data_size = DEFAULT_PING_DATA_SIZE;
 210 static unsigned int icmp_sent = 0, icmp_recv = 0, icmp_lost = 0;
 211 #define icmp_pkts_en_route (icmp_sent - (icmp_recv + icmp_lost))
 212 static unsigned short targets_down = 0, targets = 0, packets = 0;
 213 #define targets_alive (targets - targets_down)
 214 static unsigned int retry_interval, pkt_interval, target_interval;
 215 static int icmp_sock, tcp_sock, udp_sock, status = STATE_OK;
 216 static pid_t pid;
 217 static struct timezone tz;
 218 static struct timeval prog_start;
 219 static unsigned long long max_completion_time = 0;
 220 static unsigned char ttl = 0;   /* outgoing ttl */
 221 static unsigned int warn_down = 1, crit_down = 1; /* host down threshold values */
 222 static int min_hosts_alive = -1;
 223 float pkt_backoff_factor = 1.5;
 224 float target_backoff_factor = 1.5;
 225
 226 /** code start **/
 227 static void
 228 crash(const char *fmt, ...)
 229 {
 230         va_list ap;
 231
 232         printf("%s: ", progname);
 233
 234         va_start(ap, fmt);
 235         vprintf(fmt, ap);
 236         va_end(ap);
 237
 238         if(errno) printf(": %s", strerror(errno));
 239         puts("");
 240
 241         exit(3);
 242 }
 243
 244
 245 static const char *
 246 get_icmp_error_msg(unsigned char icmp_type, unsigned char icmp_code)
 247 {
 248         const char *msg = "unreachable";
 249
 250         if(debug > 1) printf("get_icmp_error_msg(%u, %u)\n", icmp_type, icmp_code);
 251         switch(icmp_type) {
 252         case ICMP_UNREACH:
 253                 switch(icmp_code) {
 254                 case ICMP_UNREACH_NET: msg = "Net unreachable"; break;
 255                 case ICMP_UNREACH_HOST: msg = "Host unreachable"; break;
 256                 case ICMP_UNREACH_PROTOCOL: msg = "Protocol unreachable (firewall?)"; break;
 257                 case ICMP_UNREACH_PORT: msg = "Port unreachable (firewall?)"; break;
 258                 case ICMP_UNREACH_NEEDFRAG: msg = "Fragmentation needed"; break;
 259                 case ICMP_UNREACH_SRCFAIL: msg = "Source route failed"; break;
 260                 case ICMP_UNREACH_ISOLATED: msg = "Source host isolated"; break;
 261                 case ICMP_UNREACH_NET_UNKNOWN: msg = "Unknown network"; break;
 262                 case ICMP_UNREACH_HOST_UNKNOWN: msg = "Unknown host"; break;
 263                 case ICMP_UNREACH_NET_PROHIB: msg = "Network denied (firewall?)"; break;
 264                 case ICMP_UNREACH_HOST_PROHIB: msg = "Host denied (firewall?)"; break;
 265                 case ICMP_UNREACH_TOSNET: msg = "Bad TOS for network (firewall?)"; break;
 266                 case ICMP_UNREACH_TOSHOST: msg = "Bad TOS for host (firewall?)"; break;
 267                 case ICMP_UNREACH_FILTER_PROHIB: msg = "Prohibited by filter (firewall)"; break;
 268                 case ICMP_UNREACH_HOST_PRECEDENCE: msg = "Host precedence violation"; break;
 269                 case ICMP_UNREACH_PRECEDENCE_CUTOFF: msg = "Precedence cutoff"; break;
 270                 default: msg = "Invalid code"; break;
 271                 }
 272                 break;
 273
 274         case ICMP_TIMXCEED:
 275                 /* really 'out of reach', or non-existant host behind a router serving
 276                  * two different subnets */
 277                 switch(icmp_code) {
 278                 case ICMP_TIMXCEED_INTRANS: msg = "Time to live exceeded in transit"; break;
 279                 case ICMP_TIMXCEED_REASS: msg = "Fragment reassembly time exceeded"; break;
 280                 default: msg = "Invalid code"; break;
 281                 }
 282                 break;
 283
 284         case ICMP_SOURCEQUENCH: msg = "Transmitting too fast"; break;
 285         case ICMP_REDIRECT: msg = "Redirect (change route)"; break;
 286         case ICMP_PARAMPROB: msg = "Bad IP header (required option absent)"; break;
 287
 288                 /* the following aren't error messages, so ignore */
 289         case ICMP_TSTAMP:
 290         case ICMP_TSTAMPREPLY:
 291         case ICMP_IREQ:
 292         case ICMP_IREQREPLY:
 293         case ICMP_MASKREQ:
 294         case ICMP_MASKREPLY:
 295         default: msg = ""; break;
 296         }
 297
 298         return msg;
 299 }
 300
 301 static int
 302 handle_random_icmp(char *packet, struct sockaddr_in *addr)
 303 {
 304         struct icmp p, sent_icmp;
 305         struct rta_host *host = NULL;
 306
 307         memcpy(&p, packet, sizeof(p));
 308         if(p.icmp_type == ICMP_ECHO && p.icmp_id == pid) {
 309                 /* echo request from us to us (pinging localhost) */
 310                 return 0;
 311         }
 312
 313         if(debug) printf("handle_random_icmp(%p, %p)\n", (void *)&p, (void *)addr);
 314
 315         /* only handle a few types, since others can't possibly be replies to
 316          * us in a sane network (if it is anyway, it will be counted as lost
 317          * at summary time, but not as quickly as a proper response */
 318         /* TIMXCEED can be an unreach from a router with multiple IP's which
 319          * serves two different subnets on the same interface and a dead host
 320          * on one net is pinged from the other. The router will respond to
 321          * itself and thus set TTL=0 so as to not loop forever.  Even when
 322          * TIMXCEED actually sends a proper icmp response we will have passed
 323          * too many hops to have a hope of reaching it later, in which case it
 324          * indicates overconfidence in the network, poor routing or both. */
 325         if(p.icmp_type != ICMP_UNREACH && p.icmp_type != ICMP_TIMXCEED &&
 326            p.icmp_type != ICMP_SOURCEQUENCH && p.icmp_type != ICMP_PARAMPROB)
 327         {
 328                 return 0;
 329         }
 330
 331         /* might be for us. At least it holds the original package (according
 332          * to RFC 792). If it isn't, just ignore it */
 333         memcpy(&sent_icmp, packet + 28, sizeof(sent_icmp));
 334         if(sent_icmp.icmp_type != ICMP_ECHO || sent_icmp.icmp_id != pid ||
 335            sent_icmp.icmp_seq >= targets)
 336         {
 337                 if(debug) printf("Packet is no response to a packet we sent\n");
 338                 return 0;
 339         }
 340
 341         /* it is indeed a response for us */
 342         host = table[sent_icmp.icmp_seq];
 343         if(debug) {
 344                 printf("Received \"%s\" from %s for ICMP ECHO sent to %s.\n",
 345                            get_icmp_error_msg(p.icmp_type, p.icmp_code),
 346                            inet_ntoa(addr->sin_addr), host->name);
 347         }
 348
 349         icmp_lost++;
 350         host->icmp_lost++;
 351         /* don't spend time on lost hosts any more */
 352         if(host->flags & FLAG_LOST_CAUSE) return 0;
 353
 354         /* source quench means we're sending too fast, so increase the
 355          * interval and mark this packet lost */
 356         if(p.icmp_type == ICMP_SOURCEQUENCH) {
 357                 pkt_interval *= pkt_backoff_factor;
 358                 target_interval *= target_backoff_factor;
 359         }
 360         else {
 361                 targets_down++;
 362                 host->flags |= FLAG_LOST_CAUSE;
 363         }
 364         host->icmp_type = p.icmp_type;
 365         host->icmp_code = p.icmp_code;
 366         host->error_addr.s_addr = addr->sin_addr.s_addr;
 367
 368         return 0;
 369 }
 370
 371 int
 372 main(int argc, char **argv)
 373 {
 374         int i;
 375         char *ptr;
 376         long int arg;
 377         int icmp_sockerrno, udp_sockerrno, tcp_sockerrno;
 378         int result;
 379         struct rta_host *host;
 380
 381         setlocale (LC_ALL, "");
 382         bindtextdomain (PACKAGE, LOCALEDIR);
 383         textdomain (PACKAGE);
 384
 385         /* print a helpful error message if geteuid != 0 */
 386         np_warn_if_not_root();
 387
 388         /* we only need to be setsuid when we get the sockets, so do
 389          * that before pointer magic (esp. on network data) */
 390         icmp_sockerrno = udp_sockerrno = tcp_sockerrno = sockets = 0;
 391
 392         if((icmp_sock = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) != -1)
 393                 sockets |= HAVE_ICMP;
 394         else icmp_sockerrno = errno;
 395
 396         /* if((udp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1) */
 397         /*      sockets |= HAVE_UDP; */
 398         /* else udp_sockerrno = errno; */
 399
 400         /* if((tcp_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1) */
 401         /*      sockets |= HAVE_TCP; */
 402         /* else tcp_sockerrno = errno; */
 403
 404         /* now drop privileges (no effect if not setsuid or geteuid() == 0) */
 405         setuid(getuid());
 406
 407         /* POSIXLY_CORRECT might break things, so unset it (the portable way) */
 408         environ = NULL;
 409
 410         /* use the pid to mark packets as ours */
 411         /* Some systems have 32-bit pid_t so mask off only 16 bits */
 412         pid = getpid() & 0xffff;
 413         /* printf("pid = %u\n", pid); */
 414
 415         /* get calling name the old-fashioned way for portability instead
 416          * of relying on the glibc-ism __progname */
 417         ptr = strrchr(argv[0], '/');
 418         if(ptr) progname = &ptr[1];
 419         else progname = argv[0];
 420
 421         /* now set defaults. Use progname to set them initially (allows for
 422          * superfast check_host program when target host is up */
 423         cursor = list = NULL;
 424         table = NULL;
 425
 426         mode = MODE_RTA;
 427         crit.rta = 500000;
 428         crit.pl = 80;
 429         warn.rta = 200000;
 430         warn.pl = 40;
 431         protocols = HAVE_ICMP | HAVE_UDP | HAVE_TCP;
 432         pkt_interval = 80000;  /* 80 msec packet interval by default */
 433         packets = 5;
 434
 435         if(!strcmp(progname, "check_icmp") || !strcmp(progname, "check_ping")) {
 436                 mode = MODE_ICMP;
 437                 protocols = HAVE_ICMP;
 438         }
 439         else if(!strcmp(progname, "check_host")) {
 440                 mode = MODE_HOSTCHECK;
 441                 pkt_interval = 1000000;
 442                 packets = 5;
 443                 crit.rta = warn.rta = 1000000;
 444                 crit.pl = warn.pl = 100;
 445         }
 446         else if(!strcmp(progname, "check_rta_multi")) {
 447                 mode = MODE_ALL;
 448                 target_interval = 0;
 449                 pkt_interval = 50000;
 450                 packets = 5;
 451         }
 452
 453         /* parse the arguments */
 454         for(i = 1; i < argc; i++) {
 455                 while((arg = getopt(argc, argv, "vhVw:c:n:p:t:H:s:i:b:I:l:m:")) != EOF) {
 456                         switch(arg) {
 457                         case 'v':
 458                                 debug++;
 459                                 break;
 460                         case 'b':
 461                                 /* silently ignored for now */
 462                                 break;
 463                         case 'i':
 464                                 pkt_interval = get_timevar(optarg);
 465                                 break;
 466                         case 'I':
 467                                 target_interval = get_timevar(optarg);
 468                                 break;
 469                         case 'w':
 470                                 get_threshold(optarg, &warn);
 471                                 break;
 472                         case 'c':
 473                                 get_threshold(optarg, &crit);
 474                                 break;
 475                         case 'n':
 476                         case 'p':
 477                                 packets = strtoul(optarg, NULL, 0);
 478                                 break;
 479                         case 't':
 480                                 timeout = strtoul(optarg, NULL, 0);
 481                                 if(!timeout) timeout = 10;
 482                                 break;
 483                         case 'H':
 484                                 add_target(optarg);
 485                                 break;
 486                         case 'l':
 487                                 ttl = (unsigned char)strtoul(optarg, NULL, 0);
 488                                 break;
 489                         case 'm':
 490                                 min_hosts_alive = (int)strtoul(optarg, NULL, 0);
 491                                 break;
 492                         case 'd': /* implement later, for cluster checks */
 493                                 warn_down = (unsigned char)strtoul(optarg, &ptr, 0);
 494                                 if(ptr) {
 495                                         crit_down = (unsigned char)strtoul(ptr + 1, NULL, 0);
 496                                 }
 497                                 break;
 498                         case 's': /* specify source IP address */
 499                                 set_source_ip(optarg);
 500                                 break;
 501       case 'V':                 /* version */
 502         /*print_revision (progname, revision);*/ /* FIXME: Why? */
 503         exit (STATE_OK);
 504       case 'h':                 /* help */
 505         print_help ();
 506         exit (STATE_OK);
 507                         }
 508                 }
 509         }
 510
 511         argv = &argv[optind];
 512         while(*argv) {
 513                 add_target(*argv);
 514                 argv++;
 515         }
 516         if(!targets) {
 517                 errno = 0;
 518                 crash("No hosts to check");
 519                 exit(3);
 520         }
 521
 522         if(!sockets) {
 523                 if(icmp_sock == -1) {
 524                         errno = icmp_sockerrno;
 525                         crash("Failed to obtain ICMP socket");
 526                         return -1;
 527                 }
 528                 /* if(udp_sock == -1) { */
 529                 /*      errno = icmp_sockerrno; */
 530                 /*      crash("Failed to obtain UDP socket"); */
 531                 /*      return -1; */
 532                 /* } */
 533                 /* if(tcp_sock == -1) { */
 534                 /*      errno = icmp_sockerrno; */
 535                 /*      crash("Failed to obtain TCP socker"); */
 536                 /*      return -1; */
 537                 /* } */
 538         }
 539         if(!ttl) ttl = 64;
 540
 541         if(icmp_sock) {
 542                 result = setsockopt(icmp_sock, SOL_IP, IP_TTL, &ttl, sizeof(ttl));
 543                 if(debug) {
 544                         if(result == -1) printf("setsockopt failed\n");
 545                         else printf("ttl set to %u\n", ttl);
 546                 }
 547         }
 548
 549         /* stupid users should be able to give whatever thresholds they want
 550          * (nothing will break if they do), but some anal plugin maintainer
 551          * will probably add some printf() thing here later, so it might be
 552          * best to at least show them where to do it. ;) */
 553         if(warn.pl > crit.pl) warn.pl = crit.pl;
 554         if(warn.rta > crit.rta) warn.rta = crit.rta;
 555         if(warn_down > crit_down) crit_down = warn_down;
 556
 557         signal(SIGINT, finish);
 558         signal(SIGHUP, finish);
 559         signal(SIGTERM, finish);
 560         signal(SIGALRM, finish);
 561         if(debug) printf("Setting alarm timeout to %u seconds\n", timeout);
 562         alarm(timeout);
 563
 564         /* make sure we don't wait any longer than necessary */
 565         gettimeofday(&prog_start, &tz);
 566         max_completion_time =
 567                 ((targets * packets * pkt_interval) + (targets * target_interval)) +
 568                 (targets * packets * crit.rta) + crit.rta;
 569
 570         if(debug) {
 571                 printf("packets: %u, targets: %u\n"
 572                            "target_interval: %0.3f, pkt_interval %0.3f\n"
 573                            "crit.rta: %0.3f\n"
 574                            "max_completion_time: %0.3f\n",
 575                            packets, targets,
 576                            (float)target_interval / 1000, (float)pkt_interval / 1000,
 577                            (float)crit.rta / 1000,
 578                            (float)max_completion_time / 1000);
 579         }
 580
 581         if(debug) {
 582                 if(max_completion_time > (u_int)timeout * 1000000) {
 583                         printf("max_completion_time: %llu  timeout: %u\n",
 584                                    max_completion_time, timeout);
 585                         printf("Timout must be at lest %llu\n",
 586                                    max_completion_time / 1000000 + 1);
 587                 }
 588         }
 589
 590         icmp_pkt_size = icmp_data_size + ICMP_MINLEN;
 591         if(debug > 2) printf("icmp_pkt_size = %u\n", icmp_pkt_size);
 592         if(icmp_pkt_size < sizeof(struct icmp) + sizeof(struct icmp_ping_data)) {
 593                 icmp_pkt_size = sizeof(struct icmp) + sizeof(struct icmp_ping_data);
 594         }
 595         if(debug > 2) printf("icmp_pkt_size = %u\n", icmp_pkt_size);
 596
 597         if(debug) {
 598                 printf("crit = {%u, %u%%}, warn = {%u, %u%%}\n",
 599                            crit.rta, crit.pl, warn.rta, warn.pl);
 600                 printf("pkt_interval: %u  target_interval: %u  retry_interval: %u\n",
 601                            pkt_interval, target_interval, retry_interval);
 602                 printf("icmp_pkt_size: %u  timeout: %u\n",
 603                            icmp_pkt_size, timeout);
 604         }
 605
 606         if(packets > 20) {
 607                 errno = 0;
 608                 crash("packets is > 20 (%d)", packets);
 609         }
 610
 611         if(min_hosts_alive < -1) {
 612                 errno = 0;
 613                 crash("minimum alive hosts is negative (%i)", min_hosts_alive);
 614         }
 615
 616         host = list;
 617         table = malloc(sizeof(struct rta_host **) * (argc - 1));
 618         i = 0;
 619         while(host) {
 620                 host->id = i;
 621                 table[i] = host;
 622                 host = host->next;
 623                 i++;
 624         }
 625
 626         run_checks();
 627
 628         errno = 0;
 629         finish(0);
 630
 631         return(0);
 632 }
 633
 634 static void
 635 run_checks()
 636 {
 637         u_int i, t, result;
 638         u_int final_wait, time_passed;
 639
 640         /* this loop might actually violate the pkt_interval or target_interval
 641          * settings, but only if there aren't any packets on the wire which
 642          * indicates that the target can handle an increased packet rate */
 643         for(i = 0; i < packets; i++) {
 644                 for(t = 0; t < targets; t++) {
 645                         /* don't send useless packets */
 646                         if(!targets_alive) finish(0);
 647                         if(table[t]->flags & FLAG_LOST_CAUSE) {
 648                                 if(debug) printf("%s is a lost cause. not sending any more\n",
 649                                                                  table[t]->name);
 650                                 continue;
 651                         }
 652
 653                         /* we're still in the game, so send next packet */
 654                         (void)send_icmp_ping(icmp_sock, table[t]);
 655                         result = wait_for_reply(icmp_sock, target_interval);
 656                 }
 657                 result = wait_for_reply(icmp_sock, pkt_interval * targets);
 658         }
 659
 660         if(icmp_pkts_en_route && targets_alive) {
 661                 time_passed = get_timevaldiff(NULL, NULL);
 662                 final_wait = max_completion_time - time_passed;
 663
 664                 if(debug) {
 665                         printf("time_passed: %u  final_wait: %u  max_completion_time: %llu\n",
 666                                    time_passed, final_wait, max_completion_time);
 667                 }
 668                 if(time_passed > max_completion_time) {
 669                         if(debug) printf("Time passed. Finishing up\n");
 670                         finish(0);
 671                 }
 672
 673                 /* catch the packets that might come in within the timeframe, but
 674                  * haven't yet */
 675                 if(debug) printf("Waiting for %u micro-seconds (%0.3f msecs)\n",
 676                                                  final_wait, (float)final_wait / 1000);
 677                 result = wait_for_reply(icmp_sock, final_wait);
 678         }
 679 }
 680
 681 /* response structure:
 682  * ip header   : 20 bytes
 683  * icmp header : 28 bytes
 684  * icmp echo reply : the rest
 685  */
 686 static int
 687 wait_for_reply(int sock, u_int t)
 688 {
 689         int n, hlen;
 690         static char buf[4096];
 691         struct sockaddr_in resp_addr;
 692         struct ip *ip;
 693         struct icmp icp;
 694         struct rta_host *host;
 695         struct icmp_ping_data data;
 696         struct timeval wait_start, now;
 697         u_int tdiff, i, per_pkt_wait;
 698
 699         /* if we can't listen or don't have anything to listen to, just return */
 700         if(!t || !icmp_pkts_en_route) return 0;
 701
 702         gettimeofday(&wait_start, &tz);
 703
 704         i = t;
 705         per_pkt_wait = t / icmp_pkts_en_route;
 706         while(icmp_pkts_en_route && get_timevaldiff(&wait_start, NULL) < i) {
 707                 t = per_pkt_wait;
 708
 709                 /* wrap up if all targets are declared dead */
 710                 if(!targets_alive ||
 711                    get_timevaldiff(&prog_start, NULL) >= max_completion_time ||
 712                    (mode == MODE_HOSTCHECK && targets_down))
 713                 {
 714                         finish(0);
 715                 }
 716
 717                 /* reap responses until we hit a timeout */
 718                 n = recvfrom_wto(sock, buf, sizeof(buf),
 719                                                  (struct sockaddr *)&resp_addr, &t);
 720                 if(!n) {
 721                         if(debug > 1) {
 722                                 printf("recvfrom_wto() timed out during a %u usecs wait\n",
 723                                            per_pkt_wait);
 724                         }
 725                         continue;       /* timeout for this one, so keep trying */
 726                 }
 727                 if(n < 0) {
 728                         if(debug) printf("recvfrom_wto() returned errors\n");
 729                         return n;
 730                 }
 731
 732                 ip = (struct ip *)buf;
 733                 if(debug > 1) printf("received %u bytes from %s\n",
 734                                                  ntohs(ip->ip_len), inet_ntoa(resp_addr.sin_addr));
 735
 736 /* obsolete. alpha on tru64 provides the necessary defines, but isn't broken */
 737 /* #if defined( __alpha__ ) && __STDC__ && !defined( __GLIBC__ ) */
 738                 /* alpha headers are decidedly broken. Using an ansi compiler,
 739                  * they provide ip_vhl instead of ip_hl and ip_v, so we mask
 740                  * off the bottom 4 bits */
 741 /*              hlen = (ip->ip_vhl & 0x0f) << 2; */
 742 /* #else */
 743                 hlen = ip->ip_hl << 2;
 744 /* #endif */
 745
 746                 if(n < (hlen + ICMP_MINLEN)) {
 747                         crash("received packet too short for ICMP (%d bytes, expected %d) from %s\n",
 748                                   n, hlen + icmp_pkt_size, inet_ntoa(resp_addr.sin_addr));
 749                 }
 750                 /* else if(debug) { */
 751                 /*      printf("ip header size: %u, packet size: %u (expected %u, %u)\n", */
 752                 /*                 hlen, ntohs(ip->ip_len) - hlen, */
 753                 /*                 sizeof(struct ip), icmp_pkt_size); */
 754                 /* } */
 755
 756                 /* check the response */
 757                 memcpy(&icp, buf + hlen, sizeof(icp));
 758
 759                 if(icp.icmp_id != pid) {
 760                         handle_random_icmp(buf + hlen, &resp_addr);
 761                         continue;
 762                 }
 763
 764                 if(icp.icmp_type != ICMP_ECHOREPLY || icp.icmp_seq >= targets) {
 765                         if(debug > 2) printf("not a proper ICMP_ECHOREPLY\n");
 766                         handle_random_icmp(buf + hlen, &resp_addr);
 767                         continue;
 768                 }
 769
 770                 /* this is indeed a valid response */
 771                 memcpy(&data, icp.icmp_data, sizeof(data));
 772
 773                 host = table[icp.icmp_seq];
 774                 gettimeofday(&now, &tz);
 775                 tdiff = get_timevaldiff(&data.stime, &now);
 776
 777                 host->time_waited += tdiff;
 778                 host->icmp_recv++;
 779                 icmp_recv++;
 780
 781                 if(debug) {
 782                         printf("%0.3f ms rtt from %s, outgoing ttl: %u, incoming ttl: %u\n",
 783                                    (float)tdiff / 1000, inet_ntoa(resp_addr.sin_addr),
 784                                    ttl, ip->ip_ttl);
 785                 }
 786
 787                 /* if we're in hostcheck mode, exit with limited printouts */
 788                 if(mode == MODE_HOSTCHECK) {
 789                         printf("OK - %s responds to ICMP. Packet %u, rta %0.3fms|"
 790                                    "pkt=%u;;0;%u rta=%0.3f;%0.3f;%0.3f;;\n",
 791                                    host->name, icmp_recv, (float)tdiff / 1000,
 792                                    icmp_recv, packets, (float)tdiff / 1000,
 793                                    (float)warn.rta / 1000, (float)crit.rta / 1000);
 794                         exit(STATE_OK);
 795                 }
 796         }
 797
 798         return 0;
 799 }
 800
 801 /* the ping functions */
 802 static int
 803 send_icmp_ping(int sock, struct rta_host *host)
 804 {
 805         static union {
 806                 char *buf; /* re-use so we prevent leaks */
 807                 struct icmp *icp;
 808                 u_short *cksum_in;
 809         } packet = { NULL };
 810         long int len;
 811         struct icmp_ping_data data;
 812         struct timeval tv;
 813         struct sockaddr *addr;
 814
 815         if(sock == -1) {
 816                 errno = 0;
 817                 crash("Attempt to send on bogus socket");
 818                 return -1;
 819         }
 820         addr = (struct sockaddr *)&host->saddr_in;
 821
 822         if(!packet.buf) {
 823                 if (!(packet.buf = malloc(icmp_pkt_size))) {
 824                         crash("send_icmp_ping(): failed to malloc %d bytes for send buffer",
 825                                   icmp_pkt_size);
 826                         return -1;      /* might be reached if we're in debug mode */
 827                 }
 828         }
 829         memset(packet.buf, 0, icmp_pkt_size);
 830
 831         if((gettimeofday(&tv, &tz)) == -1) return -1;
 832
 833         data.ping_id = 10; /* host->icmp.icmp_sent; */
 834         memcpy(&data.stime, &tv, sizeof(tv));
 835         memcpy(&packet.icp->icmp_data, &data, sizeof(data));
 836         packet.icp->icmp_type = ICMP_ECHO;
 837         packet.icp->icmp_code = 0;
 838         packet.icp->icmp_cksum = 0;
 839         packet.icp->icmp_id = pid;
 840         packet.icp->icmp_seq = host->id;
 841         packet.icp->icmp_cksum = icmp_checksum(packet.cksum_in, icmp_pkt_size);
 842
 843         len = sendto(sock, packet.buf, icmp_pkt_size, 0, (struct sockaddr *)addr,
 844                                  sizeof(struct sockaddr));
 845
 846         if(len < 0 || (unsigned int)len != icmp_pkt_size) {
 847                 if(debug) printf("Failed to send ping to %s\n",
 848                                                  inet_ntoa(host->saddr_in.sin_addr));
 849                 return -1;
 850         }
 851
 852         icmp_sent++;
 853         host->icmp_sent++;
 854
 855         return 0;
 856 }
 857
 858 static int
 859 recvfrom_wto(int sock, char *buf, unsigned int len, struct sockaddr *saddr,
 860                          u_int *timo)
 861 {
 862         u_int slen;
 863         int n;
 864         struct timeval to, then, now;
 865         fd_set rd, wr;
 866
 867         if(!*timo) {
 868                 if(debug) printf("*timo is not\n");
 869                 return 0;
 870         }
 871
 872         to.tv_sec = *timo / 1000000;
 873         to.tv_usec = (*timo - (to.tv_sec * 1000000));
 874
 875         FD_ZERO(&rd);
 876         FD_ZERO(&wr);
 877         FD_SET(sock, &rd);
 878         errno = 0;
 879         gettimeofday(&then, &tz);
 880         n = select(sock + 1, &rd, &wr, NULL, &to);
 881         if(n < 0) crash("select() in recvfrom_wto");
 882         gettimeofday(&now, &tz);
 883         *timo = get_timevaldiff(&then, &now);
 884
 885         if(!n) return 0;                                /* timeout */
 886
 887         slen = sizeof(struct sockaddr);
 888
 889         return recvfrom(sock, buf, len, 0, saddr, &slen);
 890 }
 891
 892 static void
 893 finish(int sig)
 894 {
 895         u_int i = 0;
 896         unsigned char pl;
 897         double rta;
 898         struct rta_host *host;
 899         const char *status_string[] =
 900         {"OK", "WARNING", "CRITICAL", "UNKNOWN", "DEPENDENT"};
 901         int hosts_ok = 0;
 902         int hosts_warn = 0;
 903
 904         alarm(0);
 905         if(debug > 1) printf("finish(%d) called\n", sig);
 906
 907         if(icmp_sock != -1) close(icmp_sock);
 908         if(udp_sock != -1) close(udp_sock);
 909         if(tcp_sock != -1) close(tcp_sock);
 910
 911         if(debug) {
 912                 printf("icmp_sent: %u  icmp_recv: %u  icmp_lost: %u\n",
 913                            icmp_sent, icmp_recv, icmp_lost);
 914                 printf("targets: %u  targets_alive: %u\n", targets, targets_alive);
 915         }
 916
 917         /* iterate thrice to calculate values, give output, and print perfparse */
 918         host = list;
 919         while(host) {
 920                 if(!host->icmp_recv) {
 921                         /* rta 0 is ofcourse not entirely correct, but will still show up
 922                          * conspicuosly as missing entries in perfparse and cacti */
 923                         pl = 100;
 924                         rta = 0;
 925                         status = STATE_CRITICAL;
 926                         /* up the down counter if not already counted */
 927                         if(!(host->flags & FLAG_LOST_CAUSE) && targets_alive) targets_down++;
 928                 }
 929                 else {
 930                         pl = ((host->icmp_sent - host->icmp_recv) * 100) / host->icmp_sent;
 931                         rta = (double)host->time_waited / host->icmp_recv;
 932                 }
 933                 host->pl = pl;
 934                 host->rta = rta;
 935                 if(pl >= crit.pl || rta >= crit.rta) {
 936                         status = STATE_CRITICAL;
 937                 }
 938                 else if(!status && (pl >= warn.pl || rta >= warn.rta)) {
 939                         status = STATE_WARNING;
 940                         hosts_warn++;
 941                 }
 942                 else {
 943                         hosts_ok++;
 944                 }
 945
 946                 host = host->next;
 947         }
 948         /* this is inevitable */
 949         if(!targets_alive) status = STATE_CRITICAL;
 950         if(min_hosts_alive > -1) {
 951                 if(hosts_ok >= min_hosts_alive) status = STATE_OK;
 952                 else if((hosts_ok + hosts_warn) >= min_hosts_alive) status = STATE_WARNING;
 953         }
 954         printf("%s - ", status_string[status]);
 955
 956         host = list;
 957         while(host) {
 958                 if(debug) puts("");
 959                 if(i) {
 960                         if(i < targets) printf(" :: ");
 961                         else printf("\n");
 962                 }
 963                 i++;
 964                 if(!host->icmp_recv) {
 965                         status = STATE_CRITICAL;
 966                         if(host->flags & FLAG_LOST_CAUSE) {
 967                                 printf("%s: %s @ %s. rta nan, lost %d%%",
 968                                            host->name,
 969                                            get_icmp_error_msg(host->icmp_type, host->icmp_code),
 970                                            inet_ntoa(host->error_addr),
 971                                            100);
 972                         }
 973                         else { /* not marked as lost cause, so we have no flags for it */
 974                                 printf("%s: rta nan, lost 100%%", host->name);
 975                         }
 976                 }
 977                 else {  /* !icmp_recv */
 978                         printf("%s: rta %0.3fms, lost %u%%",
 979                                    host->name, host->rta / 1000, host->pl);
 980                 }
 981
 982                 host = host->next;
 983         }
 984
 985         /* iterate once more for pretty perfparse output */
 986         printf("|");
 987         i = 0;
 988         host = list;
 989         while(host) {
 990                 if(debug) puts("");
 991                 printf("%srta=%0.3fms;%0.3f;%0.3f;0; %spl=%u%%;%u;%u;; ",
 992                            (targets > 1) ? host->name : "",
 993                            host->rta / 1000, (float)warn.rta / 1000, (float)crit.rta / 1000,
 994                            (targets > 1) ? host->name : "",
 995                            host->pl, warn.pl, crit.pl);
 996
 997                 host = host->next;
 998         }
 999
1000         if(min_hosts_alive > -1) {
1001                 if(hosts_ok >= min_hosts_alive) status = STATE_OK;
1002                 else if((hosts_ok + hosts_warn) >= min_hosts_alive) status = STATE_WARNING;
1003         }
1004
1005         /* finish with an empty line */
1006         puts("");
1007         if(debug) printf("targets: %u, targets_alive: %u, hosts_ok: %u, hosts_warn: %u, min_hosts_alive: %i\n",
1008                                          targets, targets_alive, hosts_ok, hosts_warn, min_hosts_alive);
1009
1010         exit(status);
1011 }
1012
1013 static u_int
1014 get_timevaldiff(struct timeval *early, struct timeval *later)
1015 {
1016         u_int ret;
1017         struct timeval now;
1018
1019         if(!later) {
1020                 gettimeofday(&now, &tz);
1021                 later = &now;
1022         }
1023         if(!early) early = &prog_start;
1024
1025         /* if early > later we return 0 so as to indicate a timeout */
1026         if(early->tv_sec > early->tv_sec ||
1027            (early->tv_sec == later->tv_sec && early->tv_usec > later->tv_usec))
1028         {
1029                 return 0;
1030         }
1031
1032         ret = (later->tv_sec - early->tv_sec) * 1000000;
1033         ret += later->tv_usec - early->tv_usec;
1034
1035         return ret;
1036 }
1037
1038 static int
1039 add_target_ip(char *arg, struct in_addr *in)
1040 {
1041         struct rta_host *host;
1042
1043         /* disregard obviously stupid addresses */
1044         if(in->s_addr == INADDR_NONE || in->s_addr == INADDR_ANY)
1045                 return -1;
1046
1047         /* no point in adding two identical IP's, so don't. ;) */
1048         host = list;
1049         while(host) {
1050                 if(host->saddr_in.sin_addr.s_addr == in->s_addr) {
1051                         if(debug) printf("Identical IP already exists. Not adding %s\n", arg);
1052                         return -1;
1053                 }
1054                 host = host->next;
1055         }
1056
1057         /* add the fresh ip */
1058         host = malloc(sizeof(struct rta_host));
1059         if(!host) {
1060                 crash("add_target_ip(%s, %s): malloc(%d) failed",
1061                           arg, inet_ntoa(*in), sizeof(struct rta_host));
1062         }
1063         memset(host, 0, sizeof(struct rta_host));
1064
1065         /* set the values. use calling name for output */
1066         host->name = strdup(arg);
1067
1068         /* fill out the sockaddr_in struct */
1069         host->saddr_in.sin_family = AF_INET;
1070         host->saddr_in.sin_addr.s_addr = in->s_addr;
1071
1072         if(!list) list = cursor = host;
1073         else cursor->next = host;
1074
1075         cursor = host;
1076         targets++;
1077
1078         return 0;
1079 }
1080
1081 /* wrapper for add_target_ip */
1082 static int
1083 add_target(char *arg)
1084 {
1085         int i;
1086         struct hostent *he;
1087         struct in_addr *in, ip;
1088
1089         /* don't resolve if we don't have to */
1090         if((ip.s_addr = inet_addr(arg)) != INADDR_NONE) {
1091                 /* don't add all ip's if we were given a specific one */
1092                 return add_target_ip(arg, &ip);
1093                 /* he = gethostbyaddr((char *)in, sizeof(struct in_addr), AF_INET); */
1094                 /* if(!he) return add_target_ip(arg, in); */
1095         }
1096         else {
1097                 errno = 0;
1098                 he = gethostbyname(arg);
1099                 if(!he) {
1100                         errno = 0;
1101                         crash("Failed to resolve %s", arg);
1102                         return -1;
1103                 }
1104         }
1105
1106         /* possibly add all the IP's as targets */
1107         for(i = 0; he->h_addr_list[i]; i++) {
1108                 in = (struct in_addr *)he->h_addr_list[i];
1109                 add_target_ip(arg, in);
1110
1111                 /* this is silly, but it works */
1112                 if(mode == MODE_HOSTCHECK || mode == MODE_ALL) {
1113                         if(debug > 2) printf("mode: %d\n", mode);
1114                         continue;
1115                 }
1116                 break;
1117         }
1118
1119         return 0;
1120 }
1121
1122 static void
1123 set_source_ip(char *arg)
1124 {
1125         struct sockaddr_in src;
1126
1127         memset(&src, 0, sizeof(src));
1128         src.sin_family = AF_INET;
1129         if((src.sin_addr.s_addr = inet_addr(arg)) == INADDR_NONE)
1130                 src.sin_addr.s_addr = get_ip_address(arg);
1131         if(bind(icmp_sock, (struct sockaddr *)&src, sizeof(src)) == -1)
1132                 crash("Cannot bind to IP address %s", arg);
1133 }
1134
1135 /* TODO: Move this to netutils.c and also change check_dhcp to use that. */
1136 static in_addr_t
1137 get_ip_address(const char *ifname)
1138 {
1139 #if defined(SIOCGIFADDR)
1140         struct ifreq ifr;
1141         struct sockaddr_in ip;
1142
1143         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
1144         ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
1145         if(ioctl(icmp_sock, SIOCGIFADDR, &ifr) == -1)
1146                 crash("Cannot determine IP address of interface %s", ifname);
1147         memcpy(&ip, &ifr.ifr_addr, sizeof(ip));
1148         return ip.sin_addr.s_addr;
1149 #else
1150         errno = 0;
1151         crash("Cannot get interface IP address on this platform.");
1152 #endif
1153 }
1154
1155 /*
1156  * u = micro
1157  * m = milli
1158  * s = seconds
1159  * return value is in microseconds
1160  */
1161 static u_int
1162 get_timevar(const char *str)
1163 {
1164         char p, u, *ptr;
1165         unsigned int len;
1166         u_int i, d;                 /* integer and decimal, respectively */
1167         u_int factor = 1000;    /* default to milliseconds */
1168
1169         if(!str) return 0;
1170         len = strlen(str);
1171         if(!len) return 0;
1172
1173         /* unit might be given as ms|m (millisec),
1174          * us|u (microsec) or just plain s, for seconds */
1175         u = p = '\0';
1176         u = str[len - 1];
1177         if(len >= 2 && !isdigit((int)str[len - 2])) p = str[len - 2];
1178         if(p && u == 's') u = p;
1179         else if(!p) p = u;
1180         if(debug > 2) printf("evaluating %s, u: %c, p: %c\n", str, u, p);
1181
1182         if(u == 'u') factor = 1;            /* microseconds */
1183         else if(u == 'm') factor = 1000;        /* milliseconds */
1184         else if(u == 's') factor = 1000000;     /* seconds */
1185         if(debug > 2) printf("factor is %u\n", factor);
1186
1187         i = strtoul(str, &ptr, 0);
1188         if(!ptr || *ptr != '.' || strlen(ptr) < 2 || factor == 1)
1189                 return i * factor;
1190
1191         /* time specified in usecs can't have decimal points, so ignore them */
1192         if(factor == 1) return i;
1193
1194         d = strtoul(ptr + 1, NULL, 0);
1195
1196         /* d is decimal, so get rid of excess digits */
1197         while(d >= factor) d /= 10;
1198
1199         /* the last parenthesis avoids floating point exceptions. */
1200         return ((i * factor) + (d * (factor / 10)));
1201 }
1202
1203 /* not too good at checking errors, but it'll do (main() should barfe on -1) */
1204 static int
1205 get_threshold(char *str, threshold *th)
1206 {
1207         char *p = NULL, i = 0;
1208
1209         if(!str || !strlen(str) || !th) return -1;
1210
1211         /* pointer magic slims code by 10 lines. i is bof-stop on stupid libc's */
1212         p = &str[strlen(str) - 1];
1213         while(p != &str[1]) {
1214                 if(*p == '%') *p = '\0';
1215                 else if(*p == ',' && i) {
1216                         *p = '\0';      /* reset it so get_timevar(str) works nicely later */
1217                         th->pl = (unsigned char)strtoul(p+1, NULL, 0);
1218                         break;
1219                 }
1220                 i = 1;
1221                 p--;
1222         }
1223         th->rta = get_timevar(str);
1224
1225         if(!th->rta) return -1;
1226
1227         if(th->rta > MAXTTL * 1000000) th->rta = MAXTTL * 1000000;
1228         if(th->pl > 100) th->pl = 100;
1229
1230         return 0;
1231 }
1232
1233 unsigned short
1234 icmp_checksum(unsigned short *p, int n)
1235 {
1236         register unsigned short cksum;
1237         register long sum = 0;
1238
1239         while(n > 1) {
1240                 sum += *p++;
1241                 n -= 2;
1242         }
1243
1244         /* mop up the occasional odd byte */
1245         if(n == 1) sum += (unsigned char)*p;
1246
1247         sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
1248         sum += (sum >> 16);                     /* add carry */
1249         cksum = ~sum;                           /* ones-complement, trunc to 16 bits */
1250
1251         return cksum;
1252 }
1253
1254 void
1255 print_help(void)
1256 {
1257
1258   /*print_revision (progname, revision);*/ /* FIXME: Why? */
1259
1260   printf ("Copyright (c) 2005 Andreas Ericsson <ae@op5.se>\n");
1261   printf (COPYRIGHT, copyright, email);
1262
1263   printf ("\n\n");
1264
1265   print_usage ();
1266
1267   printf (_(UT_HELP_VRSN));
1268
1269   printf (" %s\n", "-H");
1270   printf ("    %s\n", _("specify a target"));
1271   printf (" %s\n", "-w");
1272   printf ("    %s", _("warning threshold (currently "));
1273   printf ("%0.3fms,%u%%)\n", (float)warn.rta / 1000 , warn.pl / 1000);
1274   printf (" %s\n", "-c");
1275   printf ("    %s", _("critical threshold (currently "));
1276   printf ("%0.3fms,%u%%)\n", (float)crit.rta, crit.pl);
1277   printf (" %s\n", "-s");
1278   printf ("    %s\n", _("specify a source IP address or device name"));
1279   printf (" %s\n", "-n");
1280   printf ("    %s", _("number of packets to send (currently "));
1281   printf ("%u)\n",packets);
1282   printf (" %s\n", "-i");
1283   printf ("    %s", _("max packet interval (currently "));
1284   printf ("%0.3fms)\n",(float)pkt_interval / 1000);
1285   printf (" %s\n", "-I");
1286   printf ("    %s", _("max target interval (currently "));
1287   printf ("%0.3fms)\n", (float)target_interval / 1000);
1288   printf (" %s\n", "-m");
1289   printf ("    %s",_("number of alive hosts required for success"));
1290   printf ("\n");
1291   printf (" %s\n", "-l");
1292   printf ("    %s", _("TTL on outgoing packets (currently "));
1293   printf ("%u)", ttl);
1294   printf (" %s\n", "-t");
1295   printf ("    %s",_("timeout value (seconds, currently  "));
1296   printf ("%u)\n", timeout);
1297   printf (" %s\n", "-b");
1298   printf ("    %s\n", _("icmp packet size (currenly ignored)"));
1299   printf (" %s\n", "-v");
1300   printf ("    %s\n", _("verbose"));
1301
1302   printf ("\n");
1303         printf ("%s\n\n", _("The -H switch is optional. Naming a host (or several) to check is not."));
1304   printf ("%s\n", _("Threshold format for -w and -c is 200.25,60% for 200.25 msec RTA and 60%"));
1305   printf ("%s\n", _("packet loss.  The default values should work well for most users."));
1306   printf ("%s\n", _("You can specify different RTA factors using the standardized abbreviations"));
1307   printf ("%s\n\n", _("us (microseconds), ms (milliseconds, default) or just plain s for seconds."));
1308 /* -d not yet implemented */
1309 /*  printf ("%s\n", _("Threshold format for -d is warn,crit.  12,14 means WARNING if >= 12 hops"));
1310   printf ("%s\n", _("are spent and CRITICAL if >= 14 hops are spent."));
1311   printf ("%s\n\n", _("NOTE: Some systems decrease TTL when forming ICMP_ECHOREPLY, others do not."));*/
1312   printf ("%s\n\n", _("The -v switch can be specified several times for increased verbosity."));
1313
1314 /*  printf ("%s\n", _("Long options are currently unsupported."));
1315   printf ("%s\n", _("Options marked with * require an argument"));
1316 */
1317   printf (_(UT_SUPPORT));
1318
1319   printf (_(UT_NOWARRANTY));
1320 }
1321
1322
1323
1324 void
1325 print_usage (void)
1326 {
1327   printf (_("Usage:"));
1328   printf(" %s [options] [-H] host1 host2 hostn\n", progname);
1329 }