Moved into plugins-root/

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1234 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 0 insertions, 1199 deletions

diff --git a/plugins/check_icmp.c b/plugins/check_icmp.c
deleted file mode 100644
index 2f03552f..00000000
--- a/plugins/check_icmp.c
+++ /dev/null
@@ -1,1199 +0,0 @@
-/*
- * $Id$
- *
- * Author: Andreas Ericsson <ae@op5.se>
- *
- * License: GNU GPL 2.0 or any later version.
- *
- * Relevant RFC's: 792 (ICMP), 791 (IP)
- *
- * This program was modeled somewhat after the check_icmp program,
- * which was in turn a hack of fping (www.fping.org) but has been
- * completely rewritten since to generate higher precision rta values,
- * and support several different modes as well as setting ttl to control.
- * redundant routes. The only remainders of fping is currently a few
- * function names.
- *
- */
-
-#include <sys/time.h>
-#include <sys/types.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <stddef.h>
-#include <errno.h>
-#include <string.h>
-#include <ctype.h>
-#include <netdb.h>
-#include <sys/socket.h>
-#include <netinet/in_systm.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/ip_icmp.h>
-#include <arpa/inet.h>
-#include <signal.h>
-
-/** sometimes undefined system macros (quite a few, actually) **/
-#ifndef MAXTTL
-# define MAXTTL	255
-#endif
-#ifndef INADDR_NONE
-# define INADDR_NONE 0xffffffU
-#endif
-
-#ifndef SOL_IP
-#define SOL_IP 0
-#endif
-
-/* we bundle these in one #ifndef, since they're all from BSD
- * Put individual #ifndef's around those that bother you */
-#ifndef ICMP_UNREACH_NET_UNKNOWN
-# define ICMP_UNREACH_NET_UNKNOWN 6
-# define ICMP_UNREACH_HOST_UNKNOWN 7
-# define ICMP_UNREACH_ISOLATED 8
-# define ICMP_UNREACH_NET_PROHIB 9
-# define ICMP_UNREACH_HOST_PROHIB 10
-# define ICMP_UNREACH_TOSNET 11
-# define ICMP_UNREACH_TOSHOST 12
-#endif
-/* tru64 has the ones above, but not these */
-#ifndef ICMP_UNREACH_FILTER_PROHIB
-# define ICMP_UNREACH_FILTER_PROHIB 13
-# define ICMP_UNREACH_HOST_PRECEDENCE 14
-# define ICMP_UNREACH_PRECEDENCE_CUTOFF 15
-#endif
-
-
-/** typedefs and such **/
-enum states {
-	STATE_OK = 0,
-	STATE_WARNING,
-	STATE_CRITICAL,
-	STATE_UNKNOWN,
-	STATE_DEPENDENT,
-	STATE_OOB
-};
-
-typedef unsigned short range_t;  /* type for get_range() -- unimplemented */
-
-typedef struct rta_host {
-	unsigned short id;           /* id in **table, and icmp pkts */
-	char *name;                  /* arg used for adding this host */
-	char *msg;                   /* icmp error message, if any */
-	struct sockaddr_in saddr_in; /* the address of this host */
-	struct in_addr error_addr;   /* stores address of error replies */
-	unsigned long long time_waited; /* total time waited, in usecs */
-	unsigned int icmp_sent, icmp_recv, icmp_lost; /* counters */
-	unsigned char icmp_type, icmp_code; /* type and code from errors */
-	unsigned short flags;        /* control/status flags */
-	double rta;                  /* measured RTA */
-	unsigned char pl;            /* measured packet loss */
-	struct rta_host *next;       /* linked list */
-} rta_host;
-
-#define FLAG_LOST_CAUSE 0x01  /* decidedly dead target. */
-
-/* threshold structure. all values are maximum allowed, exclusive */
-typedef struct threshold {
-	unsigned char pl;    /* max allowed packet loss in percent */
-	unsigned int rta;  /* roundtrip time average, microseconds */
-} threshold;
-
-/* the data structure */
-typedef struct icmp_ping_data {
-	struct timeval stime;	/* timestamp (saved in protocol struct as well) */
-	unsigned short ping_id;
-} icmp_ping_data;
-
-/* the different modes of this program are as follows:
- * MODE_RTA: send all packets no matter what (mimic check_icmp and check_ping)
- * MODE_HOSTCHECK: Return immediately upon any sign of life
- *                 In addition, sends packets to ALL addresses assigned
- *                 to this host (as returned by gethostbyname() or
- *                 gethostbyaddr() and expects one host only to be checked at
- *                 a time.  Therefore, any packet response what so ever will
- *                 count as a sign of life, even when received outside
- *                 crit.rta limit. Do not misspell any additional IP's.
- * MODE_ALL:  Requires packets from ALL requested IP to return OK (default).
- * MODE_ICMP: implement something similar to check_icmp (MODE_RTA without
- *            tcp and udp args does this)
- */
-#define MODE_RTA 0
-#define MODE_HOSTCHECK 1
-#define MODE_ALL 2
-#define MODE_ICMP 3
-
-/* the different ping types we can do
- * TODO: investigate ARP ping as well */
-#define HAVE_ICMP 1
-#define HAVE_UDP 2
-#define HAVE_TCP 4
-#define HAVE_ARP 8
-
-#define MIN_PING_DATA_SIZE sizeof(struct icmp_ping_data)
-#define MAX_IP_PKT_SIZE 65536	/* (theoretical) max IP packet size */
-#define IP_HDR_SIZE 20
-#define MAX_PING_DATA (MAX_IP_PKT_SIZE - IP_HDR_SIZE - ICMP_MINLEN)
-#define DEFAULT_PING_DATA_SIZE (MIN_PING_DATA_SIZE + 44)
-
-/* various target states */
-#define TSTATE_INACTIVE 0x01	/* don't ping this host anymore */
-#define TSTATE_WAITING 0x02		/* unanswered packets on the wire */
-#define TSTATE_ALIVE 0x04       /* target is alive (has answered something) */
-#define TSTATE_UNREACH 0x08
-
-/** prototypes **/
-static void usage(unsigned char, char *);
-static u_int get_timevar(const char *);
-static u_int get_timevaldiff(struct timeval *, struct timeval *);
-static int wait_for_reply(int, u_int);
-static int recvfrom_wto(int, char *, unsigned int, struct sockaddr *, u_int *);
-static int send_icmp_ping(int, struct rta_host *);
-static int get_threshold(char *str, threshold *th);
-static void run_checks(void);
-static int add_target(char *);
-static int add_target_ip(char *, struct in_addr *);
-static int handle_random_icmp(struct icmp *, struct sockaddr_in *);
-static unsigned short icmp_checksum(unsigned short *, int);
-static void finish(int);
-static void crash(const char *, ...);
-
-/** external **/
-extern int optind, opterr, optopt;
-extern char *optarg;
-extern char **environ;
-
-/** global variables **/
-static char *progname;
-static struct rta_host **table, *cursor, *list;
-static threshold crit = {80, 500000}, warn = {40, 200000};
-static int mode, protocols, sockets, debug = 0, timeout = 10;
-static unsigned short icmp_pkt_size, icmp_data_size = DEFAULT_PING_DATA_SIZE;
-static unsigned int icmp_sent = 0, icmp_recv = 0, icmp_lost = 0;
-#define icmp_pkts_en_route (icmp_sent - (icmp_recv + icmp_lost))
-static unsigned short targets_down = 0, targets = 0, packets = 0;
-#define targets_alive (targets - targets_down)
-static unsigned int retry_interval, pkt_interval, target_interval;
-static int icmp_sock, tcp_sock, udp_sock, status = STATE_OK;
-static pid_t pid;
-static struct timezone tz;
-static struct timeval prog_start;
-static unsigned long long max_completion_time = 0;
-static unsigned char ttl = 0;	/* outgoing ttl */
-static unsigned int warn_down = 1, crit_down = 1; /* host down threshold values */
-float pkt_backoff_factor = 1.5;
-float target_backoff_factor = 1.5;
-
-/** code start **/
-static void
-crash(const char *fmt, ...)
-{
-	va_list ap;
-
-	printf("%s: ", progname);
-
-	va_start(ap, fmt);
-	vprintf(fmt, ap);
-	va_end(ap);
-
-	if(errno) printf(": %s", strerror(errno));
-	puts("");
-
-	exit(3);
-}
-
-
-static char *
-get_icmp_error_msg(unsigned char icmp_type, unsigned char icmp_code)
-{
-	char *msg = "unreachable";
-
-	if(debug > 1) printf("get_icmp_error_msg(%u, %u)\n", icmp_type, icmp_code);
-	switch(icmp_type) {
-	case ICMP_UNREACH:
-		switch(icmp_code) {
-		case ICMP_UNREACH_NET: msg = "Net unreachable"; break;
-		case ICMP_UNREACH_HOST:	msg = "Host unreachable"; break;
-		case ICMP_UNREACH_PROTOCOL: msg = "Protocol unreachable (firewall?)"; break;
-		case ICMP_UNREACH_PORT: msg = "Port unreachable (firewall?)"; break;
-		case ICMP_UNREACH_NEEDFRAG: msg = "Fragmentation needed"; break;
-		case ICMP_UNREACH_SRCFAIL: msg = "Source route failed"; break;
-		case ICMP_UNREACH_ISOLATED: msg = "Source host isolated"; break;
-		case ICMP_UNREACH_NET_UNKNOWN: msg = "Unknown network"; break;
-		case ICMP_UNREACH_HOST_UNKNOWN: msg = "Unknown host"; break;
-		case ICMP_UNREACH_NET_PROHIB: msg = "Network denied (firewall?)"; break;
-		case ICMP_UNREACH_HOST_PROHIB: msg = "Host denied (firewall?)"; break;
-		case ICMP_UNREACH_TOSNET: msg = "Bad TOS for network (firewall?)"; break;
-		case ICMP_UNREACH_TOSHOST: msg = "Bad TOS for host (firewall?)"; break;
-		case ICMP_UNREACH_FILTER_PROHIB: msg = "Prohibited by filter (firewall)"; break;
-		case ICMP_UNREACH_HOST_PRECEDENCE: msg = "Host precedence violation"; break;
-		case ICMP_UNREACH_PRECEDENCE_CUTOFF: msg = "Precedence cutoff"; break;
-		default: msg = "Invalid code"; break;
-		}
-		break;
-
-	case ICMP_TIMXCEED:
-		/* really 'out of reach', or non-existant host behind a router serving
-		 * two different subnets */
-		switch(icmp_code) {
-		case ICMP_TIMXCEED_INTRANS: msg = "Time to live exceeded in transit"; break;
-		case ICMP_TIMXCEED_REASS: msg = "Fragment reassembly time exceeded"; break;
-		default: msg = "Invalid code"; break;
-		}
-		break;
-
-	case ICMP_SOURCEQUENCH: msg = "Transmitting too fast"; break;
-	case ICMP_REDIRECT: msg = "Redirect (change route)"; break;
-	case ICMP_PARAMPROB: msg = "Bad IP header (required option absent)"; break;
-
-		/* the following aren't error messages, so ignore */
-	case ICMP_TSTAMP:
-	case ICMP_TSTAMPREPLY:
-	case ICMP_IREQ:
-	case ICMP_IREQREPLY:
-	case ICMP_MASKREQ:
-	case ICMP_MASKREPLY:
-	default: msg = ""; break;
-	}
-
-	return msg;
-}
-
-static int
-handle_random_icmp(struct icmp *p, struct sockaddr_in *addr)
-{
-	struct icmp *sent_icmp = NULL;
-	struct rta_host *host = NULL;
-	unsigned char *ptr;
-
-	if(p->icmp_type == ICMP_ECHO && p->icmp_id == pid) {
-		/* echo request from us to us (pinging localhost) */
-		return 0;
-	}
-
-	ptr = (unsigned char *)p;
-	if(debug) printf("handle_random_icmp(%p, %p)\n", (void *)p, (void *)addr);
-
-	/* only handle a few types, since others can't possibly be replies to
-	 * us in a sane network (if it is anyway, it will be counted as lost
-	 * at summary time, but not as quickly as a proper response */
-	/* TIMXCEED can be an unreach from a router with multiple IP's which
-	 * serves two different subnets on the same interface and a dead host
-	 * on one net is pinged from the other. The router will respond to
-	 * itself and thus set TTL=0 so as to not loop forever.  Even when
-	 * TIMXCEED actually sends a proper icmp response we will have passed
-	 * too many hops to have a hope of reaching it later, in which case it
-	 * indicates overconfidence in the network, poor routing or both. */
-	if(p->icmp_type != ICMP_UNREACH && p->icmp_type != ICMP_TIMXCEED &&
-	   p->icmp_type != ICMP_SOURCEQUENCH && p->icmp_type != ICMP_PARAMPROB)
-	{
-		return 0;
-	}
-
-	/* might be for us. At least it holds the original package (according
-	 * to RFC 792). If it isn't, just ignore it */
-	sent_icmp = (struct icmp *)(ptr + 28);
-	if(sent_icmp->icmp_type != ICMP_ECHO || sent_icmp->icmp_id != pid ||
-	   sent_icmp->icmp_seq >= targets)
-	{
-		if(debug) printf("Packet is no response to a packet we sent\n");
-		return 0;
-	}
-
-	/* it is indeed a response for us */
-	host = table[sent_icmp->icmp_seq];
-	if(debug) {
-		printf("Received \"%s\" from %s for ICMP ECHO sent to %s.\n",
-			   get_icmp_error_msg(p->icmp_type, p->icmp_code),
-			   inet_ntoa(addr->sin_addr), host->name);
-	}
-
-	icmp_lost++;
-	host->icmp_lost++;
-	/* don't spend time on lost hosts any more */
-	if(host->flags & FLAG_LOST_CAUSE) return 0;
-
-	/* source quench means we're sending too fast, so increase the
-	 * interval and mark this packet lost */
-	if(p->icmp_type == ICMP_SOURCEQUENCH) {
-		pkt_interval *= pkt_backoff_factor;
-		target_interval *= target_backoff_factor;
-	}
-	else {
-		targets_down++;
-		host->flags |= FLAG_LOST_CAUSE;
-	}
-	host->icmp_type = p->icmp_type;
-	host->icmp_code = p->icmp_code;
-	host->error_addr.s_addr = addr->sin_addr.s_addr;
-
-	return 0;
-}
-
-int
-main(int argc, char **argv)
-{
-	int i;
-	char *ptr;
-	long int arg;
-	int icmp_sockerrno, udp_sockerrno, tcp_sockerrno;
-	int result;
-	struct rta_host *host;
-	
-	/* we only need to be setsuid when we get the sockets, so do
-	 * that before pointer magic (esp. on network data) */
-	icmp_sockerrno = udp_sockerrno = tcp_sockerrno = sockets = 0;
-
-	if((icmp_sock = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) != -1)
-		sockets |= HAVE_ICMP;
-	else icmp_sockerrno = errno;
-
-	/* if((udp_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) != -1) */
-	/* 	sockets |= HAVE_UDP; */
-	/* else udp_sockerrno = errno; */
-
-	/* if((tcp_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) != -1) */
-	/* 	sockets |= HAVE_TCP; */
-	/* else tcp_sockerrno = errno; */
-
-	/* now drop privileges (no effect if not setsuid or geteuid() == 0) */
-	setuid(getuid());
-
-	/* POSIXLY_CORRECT might break things, so unset it (the portable way) */
-	environ = NULL;
-
-	/* use the pid to mark packets as ours */
-	pid = getpid();
-	/* printf("pid = %u\n", pid); */
-
-	/* get calling name the old-fashioned way for portability instead
-	 * of relying on the glibc-ism __progname */
-	ptr = strrchr(argv[0], '/');
-	if(ptr) progname = &ptr[1];
-	else progname = argv[0];
-
-	/* now set defaults. Use progname to set them initially (allows for
-	 * superfast check_host program when target host is up */
-	cursor = list = NULL;
-	table = NULL;
-
-	mode = MODE_RTA;
-	crit.rta = 500000;
-	crit.pl = 80;
-	warn.rta = 200000;
-	warn.pl = 40;
-	protocols = HAVE_ICMP | HAVE_UDP | HAVE_TCP;
-	pkt_interval = 80000;  /* 80 msec packet interval by default */
-	packets = 5;
-
-	if(!strcmp(progname, "check_icmp") || !strcmp(progname, "check_ping")) {
-		mode = MODE_ICMP;
-		protocols = HAVE_ICMP;
-	}
-	else if(!strcmp(progname, "check_host")) {
-		mode = MODE_HOSTCHECK;
-		pkt_interval = 1000000;
-		packets = 5;
-		crit.rta = warn.rta = 1000000;
-		crit.pl = warn.pl = 100;
-	}
-	else if(!strcmp(progname, "check_rta_multi")) {
-		mode = MODE_ALL;
-		target_interval = 0;
-		pkt_interval = 50000;
-		packets = 5;
-	}
-
-	/* parse the arguments */
-	for(i = 1; i < argc; i++) {
-		while((arg = getopt(argc, argv, "vhVw:c:n:p:t:H:i:b:I:l:")) != EOF) {
-			switch(arg) {
-			case 'v':
-				debug++;
-				break;
-			case 'b':
-				/* silently ignored for now */
-				break;
-			case 'i':
-				pkt_interval = get_timevar(optarg);
-				break;
-			case 'I':
-				target_interval = get_timevar(optarg);
-				break;
-			case 'w':
-				get_threshold(optarg, &warn);
-				break;
-			case 'c':
-				get_threshold(optarg, &crit);
-				break;
-			case 'n':
-			case 'p':
-				packets = strtoul(optarg, NULL, 0);
-				break;
-			case 't':
-				timeout = strtoul(optarg, NULL, 0);
-				if(!timeout) timeout = 10;
-				break;
-			case 'H':
-				add_target(optarg);
-				break;
-			case 'l':
-				ttl = (unsigned char)strtoul(optarg, NULL, 0);
-				break;
-			case 'd': /* implement later, for cluster checks */
-				warn_down = (unsigned char)strtoul(optarg, &ptr, 0);
-				if(ptr) {
-					crit_down = (unsigned char)strtoul(ptr + 1, NULL, 0);
-				}
-				break;
-			case 'h': case 'V': default:
-				usage(arg, NULL);
-				break;
-			}
-		}
-	}
-
-	argv = &argv[optind];
-	while(*argv) {
-		add_target(*argv);
-		argv++;
-	}
-	if(!targets) {
-		errno = 0;
-		crash("No hosts to check");
-		exit(3);
-	}
-
-	if(!sockets) {
-		if(icmp_sock == -1) {
-			errno = icmp_sockerrno;
-			crash("Failed to obtain ICMP socket");
-			return -1;
-		}
-		/* if(udp_sock == -1) { */
-		/* 	errno = icmp_sockerrno; */
-		/* 	crash("Failed to obtain UDP socket"); */
-		/* 	return -1; */
-		/* } */
-		/* if(tcp_sock == -1) { */
-		/* 	errno = icmp_sockerrno; */
-		/* 	crash("Failed to obtain TCP socker"); */
-		/* 	return -1; */
-		/* } */
-	}
-	if(!ttl) ttl = 64;
-
-	if(icmp_sock) {
-		result = setsockopt(icmp_sock, SOL_IP, IP_TTL, &ttl, sizeof(ttl));
-		if(debug) {
-			if(result == -1) printf("setsockopt failed\n");
-			else printf("ttl set to %u\n", ttl);
-		}
-	}
-
-	/* stupid users should be able to give whatever thresholds they want
-	 * (nothing will break if they do), but some anal plugin maintainer
-	 * will probably add some printf() thing here later, so it might be
-	 * best to at least show them where to do it. ;) */
-	if(warn.pl > crit.pl) warn.pl = crit.pl;
-	if(warn.rta > crit.rta) warn.rta = crit.rta;
-	if(warn_down > crit_down) crit_down = warn_down;
-
-	signal(SIGINT, finish);
-	signal(SIGHUP, finish);
-	signal(SIGTERM, finish);
-	signal(SIGALRM, finish);
-	if(debug) printf("Setting alarm timeout to %u seconds\n", timeout);
-	alarm(timeout);
-
-	/* make sure we don't wait any longer than necessary */
-	gettimeofday(&prog_start, &tz);
-	max_completion_time =
-		((targets * packets * pkt_interval) + (targets * target_interval)) +
-		(targets * packets * crit.rta) + crit.rta;
-
-	if(debug) {
-		printf("packets: %u, targets: %u\n"
-			   "target_interval: %0.3f, pkt_interval %0.3f\n"
-			   "crit.rta: %0.3f\n"
-			   "max_completion_time: %0.3f\n",
-			   packets, targets,
-			   (float)target_interval / 1000, (float)pkt_interval / 1000,
-			   (float)crit.rta / 1000,
-			   (float)max_completion_time / 1000);
-	}
-
-	if(debug) {
-		if(max_completion_time > (u_int)timeout * 1000000) {
-			printf("max_completion_time: %llu  timeout: %u\n",
-				   max_completion_time, timeout);
-			printf("Timout must be at lest %llu\n",
-				   max_completion_time / 1000000 + 1);
-		}
-	}
-
-	icmp_pkt_size = icmp_data_size + ICMP_MINLEN;
-	if(debug > 2) printf("icmp_pkt_size = %u\n", icmp_pkt_size);
-	if(icmp_pkt_size < sizeof(struct icmp) + sizeof(struct icmp_ping_data)) {
-		icmp_pkt_size = sizeof(struct icmp) + sizeof(struct icmp_ping_data);
-	}
-	if(debug > 2) printf("icmp_pkt_size = %u\n", icmp_pkt_size);
-
-	if(debug) {
-		printf("crit = {%u, %u%%}, warn = {%u, %u%%}\n",
-			   crit.rta, crit.pl, warn.rta, warn.pl);
-		printf("pkt_interval: %u  target_interval: %u  retry_interval: %u\n",
-			   pkt_interval, target_interval, retry_interval);
-		printf("icmp_pkt_size: %u  timeout: %u\n",
-			   icmp_pkt_size, timeout);
-	}
-
-	if(packets > 20) {
-		errno = 0;
-		crash("packets is > 20 (%d)", packets);
-	}
-
-	host = list;
-	table = malloc(sizeof(struct rta_host **) * (argc - 1));
-	i = 0;
-	while(host) {
-		host->id = i;
-		table[i] = host;
-		host = host->next;
-		i++;
-	}
-
-	run_checks();
-
-	errno = 0;
-	finish(0);
-
-	return(0);
-}
-
-static void
-run_checks()
-{
-	u_int i, t, result;
-	u_int final_wait, time_passed;
-
-	/* this loop might actually violate the pkt_interval or target_interval
-	 * settings, but only if there aren't any packets on the wire which
-	 * indicates that the target can handle an increased packet rate */
-	for(i = 0; i < packets; i++) {
-		for(t = 0; t < targets; t++) {
-			/* don't send useless packets */
-			if(!targets_alive) finish(0);
-			if(table[t]->flags & FLAG_LOST_CAUSE) {
-				if(debug) printf("%s is a lost cause. not sending any more\n",
-								 table[t]->name);
-				continue;
-			}
-			
-			/* we're still in the game, so send next packet */
-			(void)send_icmp_ping(icmp_sock, table[t]);
-			result = wait_for_reply(icmp_sock, target_interval);
-		}
-		result = wait_for_reply(icmp_sock, pkt_interval * targets);
-	}
-
-	if(icmp_pkts_en_route && targets_alive) {
-		time_passed = get_timevaldiff(NULL, NULL);
-		final_wait = max_completion_time - time_passed;
-
-		if(debug) {
-			printf("time_passed: %u  final_wait: %u  max_completion_time: %llu\n",
-				   time_passed, final_wait, max_completion_time);
-		}
-		if(time_passed > max_completion_time) {
-			if(debug) printf("Time passed. Finishing up\n");
-			finish(0);
-		}
-
-		/* catch the packets that might come in within the timeframe, but
-		 * haven't yet */
-		if(debug) printf("Waiting for %u micro-seconds (%0.3f msecs)\n",
-						 final_wait, (float)final_wait / 1000);
-		result = wait_for_reply(icmp_sock, final_wait);
-	}
-}
-
-/* response structure:
- * ip header   : 20 bytes
- * icmp header : 28 bytes
- * icmp echo reply : the rest
- */
-static int
-wait_for_reply(int sock, u_int t)
-{
-	int n, hlen;
-	static char buf[4096];
-	struct sockaddr_in resp_addr;
-	struct ip *ip;
-	struct icmp *icp, *sent_icmp;
-	struct rta_host *host;
-	struct icmp_ping_data *data;
-	struct timeval wait_start, now;
-	u_int tdiff, i, per_pkt_wait;
-
-	/* if we can't listen or don't have anything to listen to, just return */
-	if(!t || !icmp_pkts_en_route) return 0;
-
-	gettimeofday(&wait_start, &tz);
-
-	i = t;
-	per_pkt_wait = t / icmp_pkts_en_route;
-	while(icmp_pkts_en_route && get_timevaldiff(&wait_start, NULL) < i) {
-		t = per_pkt_wait;
-
-		/* wrap up if all targets are declared dead */
-		if(!targets_alive ||
-		   get_timevaldiff(&prog_start, NULL) >= max_completion_time ||
-		   (mode == MODE_HOSTCHECK && targets_down))
-		{
-			finish(0);
-		}
-
-		/* reap responses until we hit a timeout */
-		n = recvfrom_wto(sock, buf, sizeof(buf),
-						 (struct sockaddr *)&resp_addr, &t);
-		if(!n) {
-			if(debug > 1) {
-				printf("recvfrom_wto() timed out during a %u usecs wait\n",
-					   per_pkt_wait);
-			}
-			continue;	/* timeout for this one, so keep trying */
-		}
-		if(n < 0) {
-			if(debug) printf("recvfrom_wto() returned errors\n");
-			return n;
-		}
-
-		ip = (struct ip *)buf;
-		if(debug > 1) printf("received %u bytes from %s\n",
-						 ntohs(ip->ip_len), inet_ntoa(resp_addr.sin_addr));
-
-/* obsolete. alpha on tru64 provides the necessary defines, but isn't broken */
-/* #if defined( __alpha__ ) && __STDC__ && !defined( __GLIBC__ ) */
-		/* alpha headers are decidedly broken. Using an ansi compiler,
-		 * they provide ip_vhl instead of ip_hl and ip_v, so we mask
-		 * off the bottom 4 bits */
-/* 		hlen = (ip->ip_vhl & 0x0f) << 2; */
-/* #else */
-		hlen = ip->ip_hl << 2;
-/* #endif */
-
-		if(n < (hlen + ICMP_MINLEN)) {
-			crash("received packet too short for ICMP (%d bytes, expected %d) from %s\n",
-				  n, hlen + icmp_pkt_size, inet_ntoa(resp_addr.sin_addr));
-		}
-		/* else if(debug) { */
-		/* 	printf("ip header size: %u, packet size: %u (expected %u, %u)\n", */
-		/* 		   hlen, ntohs(ip->ip_len) - hlen, */
-		/* 		   sizeof(struct ip), icmp_pkt_size); */
-		/* } */
-
-		/* check the response */
-		icp = (struct icmp *)(buf + hlen);
-		sent_icmp = (struct icmp *)(buf + hlen + ICMP_MINLEN);
-		/* printf("buf: %p, icp: %p, distance: %u (expected %u)\n", */
-		/* 	   buf, icp, */
-		/* 	   (u_int)icp - (u_int)buf, hlen); */
-		/* printf("buf: %p, sent_icmp: %p, distance: %u (expected %u)\n", */
-		/* 	   buf, sent_icmp, */
-		/* 	   (u_int)sent_icmp - (u_int)buf, hlen + ICMP_MINLEN); */
-
-		if(icp->icmp_id != pid) {
-			handle_random_icmp(icp, &resp_addr);
-			continue;
-		}
-
-		if(icp->icmp_type != ICMP_ECHOREPLY || icp->icmp_seq >= targets) {
-			if(debug > 2) printf("not a proper ICMP_ECHOREPLY\n");
-			handle_random_icmp(icp, &resp_addr);
-			continue;
-		}
-
-		/* this is indeed a valid response */
-		data = (struct icmp_ping_data *)(icp->icmp_data);
-
-		host = table[icp->icmp_seq];
-		gettimeofday(&now, &tz);
-		tdiff = get_timevaldiff(&data->stime, &now);
-
-		host->time_waited += tdiff;
-		host->icmp_recv++;
-		icmp_recv++;
-
-		if(debug) {
-			printf("%0.3f ms rtt from %s, outgoing ttl: %u, incoming ttl: %u\n",
-				   (float)tdiff / 1000, inet_ntoa(resp_addr.sin_addr),
-				   ttl, ip->ip_ttl);
-		}
-
-		/* if we're in hostcheck mode, exit with limited printouts */
-		if(mode == MODE_HOSTCHECK) {
-			printf("OK - %s responds to ICMP. Packet %u, rta %0.3fms|"
-				   "pkt=%u;;0;%u rta=%0.3f;%0.3f;%0.3f;;\n",
-				   host->name, icmp_recv, (float)tdiff / 1000,
-				   icmp_recv, packets, (float)tdiff / 1000,
-				   (float)warn.rta / 1000, (float)crit.rta / 1000);
-			exit(STATE_OK);
-		}
-	}
-
-	return 0;
-}
-
-/* the ping functions */
-static int
-send_icmp_ping(int sock, struct rta_host *host)
-{
-	static char *buf = NULL; /* re-use so we prevent leaks */
-	long int len;
-	struct icmp *icp;
-	struct icmp_ping_data *data;
-	struct timeval tv;
-	struct sockaddr *addr;
-
-	
-	if(sock == -1) {
-		errno = 0;
-		crash("Attempt to send on bogus socket");
-		return -1;
-	}
-	addr = (struct sockaddr *)&host->saddr_in;
-
-	if(!buf) {
-		buf = (char *)malloc(icmp_pkt_size + sizeof(struct ip));
-		if(!buf) {
-			crash("send_icmp_ping(): failed to malloc %d bytes for send buffer",
-				  icmp_pkt_size);
-			return -1;	/* might be reached if we're in debug mode */
-		}
-	}
-	memset(buf, 0, icmp_pkt_size + sizeof(struct ip));
-
-	if((gettimeofday(&tv, &tz)) == -1) return -1;
-
-	icp = (struct icmp *)buf;
-	icp->icmp_type = ICMP_ECHO;
-	icp->icmp_code = 0;
-	icp->icmp_cksum = 0;
-	icp->icmp_id = pid;
-	icp->icmp_seq = host->id;
-	data = (struct icmp_ping_data *)icp->icmp_data;
-	data->ping_id = 10; /* host->icmp.icmp_sent; */
-	memcpy(&data->stime, &tv, sizeof(struct timeval));
-	icp->icmp_cksum = icmp_checksum((u_short *)icp, icmp_pkt_size);
-
-	len = sendto(sock, buf, icmp_pkt_size, 0, (struct sockaddr *)addr,
-				 sizeof(struct sockaddr));
-
-	if(len < 0 || (unsigned int)len != icmp_pkt_size) {
-		if(debug) printf("Failed to send ping to %s\n",
-						 inet_ntoa(host->saddr_in.sin_addr));
-		return -1;
-	}
-
-	icmp_sent++;
-	host->icmp_sent++;
-
-	return 0;
-}
-
-static int
-recvfrom_wto(int sock, char *buf, unsigned int len, struct sockaddr *saddr,
-			 u_int *timo)
-{
-	u_int slen;
-	int n;
-	struct timeval to, then, now;
-	fd_set rd, wr;
-
-	if(!*timo) {
-		if(debug) printf("*timo is not\n");
-		return 0;
-	}
-
-	to.tv_sec = *timo / 1000000;
-	to.tv_usec = (*timo - (to.tv_sec * 1000000));
-
-	FD_ZERO(&rd);
-	FD_ZERO(&wr);
-	FD_SET(sock, &rd);
-	errno = 0;
-	gettimeofday(&then, &tz);
-	n = select(sock + 1, &rd, &wr, NULL, &to);
-	if(n < 0) crash("select() in recvfrom_wto");
-	gettimeofday(&now, &tz);
-	*timo = get_timevaldiff(&then, &now);
-
-	if(!n) return 0;				/* timeout */
-
-	slen = sizeof(struct sockaddr);
-
-	return recvfrom(sock, buf, len, 0, saddr, &slen);
-}
-
-static void
-finish(int sig)
-{
-	u_int i = 0;
-	unsigned char pl;
-	double rta;
-	struct rta_host *host;
-	char *status_string[] =
-	{"OK", "WARNING", "CRITICAL", "UNKNOWN", "DEPENDENT"};
-
-	alarm(0);
-	if(debug > 1) printf("finish(%d) called\n", sig);
-
-	if(icmp_sock != -1) close(icmp_sock);
-	if(udp_sock != -1) close(udp_sock);
-	if(tcp_sock != -1) close(tcp_sock);
-
-	if(debug) {
-		printf("icmp_sent: %u  icmp_recv: %u  icmp_lost: %u\n",
-			   icmp_sent, icmp_recv, icmp_lost);
-		printf("targets: %u  targets_alive: %u\n", targets, targets_alive);
-	}
-
-	/* iterate thrice to calculate values, give output, and print perfparse */
-	host = list;
-	while(host) {
-		if(!host->icmp_recv) {
-			/* rta 0 is ofcourse not entirely correct, but will still show up
-			 * conspicuosly as missing entries in perfparse and cacti */
-			pl = 100;
-			rta = 0;
-			status = STATE_CRITICAL;
-			/* up the down counter if not already counted */
-			if(!(host->flags & FLAG_LOST_CAUSE) && targets_alive) targets_down++;
-		}
-		else {
-			pl = ((host->icmp_sent - host->icmp_recv) * 100) / host->icmp_sent;
-			rta = (double)host->time_waited / host->icmp_recv;
-		}
-		host->pl = pl;
-		host->rta = rta;
-		if(!status && (pl >= warn.pl || rta >= warn.rta)) status = STATE_WARNING;
-		if(pl >= crit.pl || rta >= crit.rta) status = STATE_CRITICAL;
-
-		host = host->next;
-	}
-	/* this is inevitable */
-	if(!targets_alive) status = STATE_CRITICAL;
-	printf("%s - ", status_string[status]);
-
-	host = list;
-	while(host) {
-		if(debug) puts("");
-		if(i) {
-			if(i < targets) printf(" :: ");
-			else printf("\n");
-		}
-		i++;
-		if(!host->icmp_recv) {
-			status = STATE_CRITICAL;
-			if(host->flags & FLAG_LOST_CAUSE) {
-				printf("%s: %s @ %s. rta nan, lost %d%%",
-					   host->name,
-					   get_icmp_error_msg(host->icmp_type, host->icmp_code),
-					   inet_ntoa(host->error_addr),
-					   100);
-			}
-			else { /* not marked as lost cause, so we have no flags for it */
-				printf("%s: rta nan, lost 100%%", host->name);
-			}
-		}
-		else {	/* !icmp_recv */
-			printf("%s: rta %0.3fms, lost %u%%",
-				   host->name, host->rta / 1000, host->pl);
-		}
-
-		host = host->next;
-	}
-
-	/* iterate once more for pretty perfparse output */
-	printf("|");
-	i = 0;
-	host = list;
-	while(host) {
-		if(debug) puts("");
-		printf("%srta=%0.3fms;%0.3f;%0.3f;0; %spl=%u%%;%u;%u;; ",
-			   (targets > 1) ? host->name : "",
-			   host->rta / 1000, (float)warn.rta / 1000, (float)crit.rta / 1000,
-			   (targets > 1) ? host->name : "",
-			   host->pl, warn.pl, crit.pl);
-
-		host = host->next;
-	}
-
-	/* finish with an empty line */
-	puts("");
-	if(debug) printf("targets: %u, targets_alive: %u\n",
-					 targets, targets_alive);
-
-	exit(status);
-}
-
-static u_int
-get_timevaldiff(struct timeval *early, struct timeval *later)
-{
-	u_int ret;
-	struct timeval now;
-
-	if(!later) {
-		gettimeofday(&now, &tz);
-		later = &now;
-	}
-	if(!early) early = &prog_start;
-
-	/* if early > later we return 0 so as to indicate a timeout */
-	if(early->tv_sec > early->tv_sec ||
-	   (early->tv_sec == later->tv_sec && early->tv_usec > later->tv_usec))
-	{
-		return 0;
-	}
-
-	ret = (later->tv_sec - early->tv_sec) * 1000000;
-	ret += later->tv_usec - early->tv_usec;
-
-	return ret;
-}
-
-static int
-add_target_ip(char *arg, struct in_addr *in)
-{
-	struct rta_host *host;
-
-	/* disregard obviously stupid addresses */
-	if(in->s_addr == INADDR_NONE || in->s_addr == INADDR_ANY)
-		return -1;
-
-	/* no point in adding two identical IP's, so don't. ;) */
-	host = list;
-	while(host) {
-		if(host->saddr_in.sin_addr.s_addr == in->s_addr) {
-			if(debug) printf("Identical IP already exists. Not adding %s\n", arg);
-			return -1;
-		}
-		host = host->next;
-	}
-
-	/* add the fresh ip */
-	host = malloc(sizeof(struct rta_host));
-	if(!host) {
-		crash("add_target_ip(%s, %s): malloc(%d) failed",
-			  arg, inet_ntoa(*in), sizeof(struct rta_host));
-	}
-	memset(host, 0, sizeof(struct rta_host));
-
-	/* set the values. use calling name for output */
-	host->name = strdup(arg);
-
-	/* fill out the sockaddr_in struct */
-	host->saddr_in.sin_family = AF_INET;
-	host->saddr_in.sin_addr.s_addr = in->s_addr;
-
-	if(!list) list = cursor = host;
-	else cursor->next = host;
-
-	cursor = host;
-	targets++;
-
-	return 0;
-}
-
-/* wrapper for add_target_ip */
-static int
-add_target(char *arg)
-{
-	int i;
-	struct hostent *he;
-	struct in_addr *in, ip;
-
-	/* don't resolve if we don't have to */
-	if((ip.s_addr = inet_addr(arg)) != INADDR_NONE) {
-		/* don't add all ip's if we were given a specific one */
-		return add_target_ip(arg, &ip);
-		/* he = gethostbyaddr((char *)in, sizeof(struct in_addr), AF_INET); */
-		/* if(!he) return add_target_ip(arg, in); */
-	}
-	else {
-		errno = 0;
-		he = gethostbyname(arg);
-		if(!he) {
-			errno = 0;
-			crash("Failed to resolve %s", arg);
-			return -1;
-		}
-	}
-
-	/* possibly add all the IP's as targets */
-	for(i = 0; he->h_addr_list[i]; i++) {
-		in = (struct in_addr *)he->h_addr_list[i];
-		add_target_ip(arg, in);
-
-		/* this is silly, but it works */
-		if(mode == MODE_HOSTCHECK || mode == MODE_ALL) {
-			printf("mode: %d\n", mode);
-			continue;
-		}
-		break;
-	}
-
-	return 0;
-}
-/*
- * u = micro
- * m = milli
- * s = seconds
- * return value is in microseconds
- */
-static u_int
-get_timevar(const char *str)
-{
-	char p, u, *ptr;
-	unsigned int len;
-	u_int i, d;	            /* integer and decimal, respectively */
-	u_int factor = 1000;    /* default to milliseconds */
-
-	if(!str) return 0;
-	len = strlen(str);
-	if(!len) return 0;
-
-	/* unit might be given as ms|m (millisec),
-	 * us|u (microsec) or just plain s, for seconds */
-	u = p = '\0';
-	u = str[len - 1];
-	if(len >= 2 && !isdigit((int)str[len - 2])) p = str[len - 2];
-	if(p && u == 's') u = p;
-	else if(!p) p = u;
-	if(debug > 2) printf("evaluating %s, u: %c, p: %c\n", str, u, p);
-
-	if(u == 'u') factor = 1;            /* microseconds */
-	else if(u == 'm') factor = 1000;	/* milliseconds */
-	else if(u == 's') factor = 1000000;	/* seconds */
-	if(debug > 2) printf("factor is %u\n", factor);
-
-	i = strtoul(str, &ptr, 0);
-	if(!ptr || *ptr != '.' || strlen(ptr) < 2 || factor == 1)
-		return i * factor;
-
-	/* time specified in usecs can't have decimal points, so ignore them */
-	if(factor == 1) return i;
-
-	d = strtoul(ptr + 1, NULL, 0);
-
-	/* d is decimal, so get rid of excess digits */
-	while(d >= factor) d /= 10;
-
-	/* the last parenthesis avoids floating point exceptions. */
-	return ((i * factor) + (d * (factor / 10)));
-}
-
-/* not too good at checking errors, but it'll do (main() should barfe on -1) */
-static int
-get_threshold(char *str, threshold *th)
-{
-	char *p = NULL, i = 0;
-
-	if(!str || !strlen(str) || !th) return -1;
-
-	/* pointer magic slims code by 10 lines. i is bof-stop on stupid libc's */
-	p = &str[strlen(str) - 1];
-	while(p != &str[1]) {
-		if(*p == '%') *p = '\0';
-		else if(*p == ',' && i) {
-			*p = '\0';	/* reset it so get_timevar(str) works nicely later */
-			th->pl = (unsigned char)strtoul(p+1, NULL, 0);
-			break;
-		}
-		i = 1;
-		p--;
-	}
-	th->rta = get_timevar(str);
-
-	if(!th->rta) return -1;
-
-	if(th->rta > MAXTTL * 1000000) th->rta = MAXTTL * 1000000;
-	if(th->pl > 100) th->pl = 100;
-
-	return 0;
-}
-
-unsigned short
-icmp_checksum(unsigned short *p, int n)
-{
-	register unsigned short cksum;
-	register long sum = 0;
-
-	while(n > 1) {
-		sum += *p++;
-		n -= 2;
-	}
-
-	/* mop up the occasional odd byte */
-	if(n == 1) sum += (unsigned char)*p;
-
-	sum = (sum >> 16) + (sum & 0xffff);	/* add hi 16 to low 16 */
-	sum += (sum >> 16);			/* add carry */
-	cksum = ~sum;				/* ones-complement, trunc to 16 bits */
-
-	return cksum;
-}
-
-/* make core plugin developers happy (silly, really) */
-static void
-usage(unsigned char arg, char *msg)
-{
-	if(msg) printf("%s: %s\n", progname, msg);
-
-	if(arg == 'V') {
-		printf("$Id$\n");
-		exit(STATE_UNKNOWN);
-	}
-
-	printf("Usage: %s [options] [-H] host1 host2 hostn\n\n", progname);
-
-	if(arg != 'h') exit(3);
-
-	printf("Where options are any combination of:\n"
-		   " * -H | --host        specify a target\n"
-		   " * -w | --warn        warning threshold (currently %0.3fms,%u%%)\n"
-		   " * -c | --crit        critical threshold (currently %0.3fms,%u%%)\n"
-		   " * -n | --packets     number of packets to send (currently %u)\n"
-		   " * -i | --interval    max packet interval (currently %0.3fms)\n"
-		   " * -I | --hostint     max target interval (currently %0.3fms)\n"
-		   " * -l | --ttl         TTL on outgoing packets (currently %u)\n"
-		   " * -t | --timeout     timeout value (seconds, currently  %u)\n"
-		   " * -b | --bytes       icmp packet size (currenly ignored)\n"
-		   "   -v | --verbose     verbosity++\n"
-		   "   -h | --help        this cruft\n",
-		   (float)warn.rta / 1000, warn.pl, (float)crit.rta / 1000, crit.pl,
-		   packets,
-		   (float)pkt_interval / 1000, (float)target_interval / 1000,
-		   ttl, timeout);
-
-	puts("\nThe -H switch is optional. Naming a host (or several) to check is not.\n\n"
-		 "Threshold format for -w and -c is 200.25,60% for 200.25 msec RTA and 60%\n"
-		 "packet loss.  The default values should work well for most users.\n"
-		 "You can specify different RTA factors using the standardized abbreviations\n"
-		 "us (microseconds), ms (milliseconds, default) or just plain s for seconds.\n\n"
-		 "Threshold format for -d is warn,crit.  12,14 means WARNING if >= 12 hops\n"
-		 "are spent and CRITICAL if >= 14 hops are spent.\n"
-		 "NOTE: Some systems decrease TTL when forming ICMP_ECHOREPLY, others do not.\n\n"
-		 "The -v switch can be specified several times for increased verbosity.\n\n"
-		 "Long options are currently unsupported.\n\n"
-		 "Options marked with * require an argument\n");
-
-	puts("The latest version of this plugin can be found at http://oss.op5.se/nagios\n"
-		 "or https://devel.op5.se/oss until the day it is included in the official\n"
-		 "plugin distribution.\n");
-
-	exit(3);
-}