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diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
new file mode 100644
index 0000000..c2fa98d
--- /dev/null
+++ b/plugins/check_ntp.c
@@ -0,0 +1,355 @@
+/******************************************************************************
+ check_ntp.c: utility to check ntp servers independant of any commandline
+              programs or external libraries.
+ original author: sean finney <seanius@seanius.net>
+ ******************************************************************************
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ $Id$
+ 
+*****************************************************************************/
+
+const char *progname = "check_ntp";
+const char *revision = "$Revision$";
+const char *copyright = "2006";
+const char *email = "nagiosplug-devel@lists.sourceforge.net";
+
+#include "common.h"
+#include "netutils.h"
+#include "utils.h"
+
+static char *server_address=NULL;
+static int verbose=0;
+static int zero_offset_bad=0;
+static double owarn=0;
+static double ocrit=0;
+static short do_jitter=0;
+static double jwarn=0;
+static double jcrit=0;
+
+int process_arguments (int, char **);
+void print_help (void);
+void print_usage (void);
+
+/* this structure holds everything in an ntp request/response as per rfc1305 */
+typedef struct {
+        uint8_t flags;       /* byte with leapindicator,vers,mode. see macros */
+        uint8_t stratum;     /* clock stratum */
+        int8_t poll;         /* polling interval */
+        int8_t precision;    /* precision of the local clock */
+        int32_t rtdelay;     /* total rt delay, as a fixed point num. see macros */
+        uint32_t rtdisp;     /* like above, but for max err to primary src */
+        uint32_t refid;      /* ref clock identifier */
+        uint64_t refts;      /* reference timestamp.  local time local clock */
+        uint64_t origts;     /* time at which request departed client */
+        uint64_t rxts;       /* time at which request arrived at server */
+        uint64_t txts;       /* time at which request departed server */
+} ntp_message;
+
+/* bits 1,2 are the leap indicator */
+#define LI_MASK 0xc0
+#define LI(x) ((x&LI_MASK)>>6)
+#define LI_SET(x,y) do{ x |= ((y<<6)&LI_MASK); }while(0)
+/* and these are the values of the leap indicator */
+#define LI_NOWARNING 0x00
+#define LI_EXTRASEC 0x01
+#define LI_MISSINGSEC 0x02
+#define LI_ALARM 0x03
+/* bits 3,4,5 are the ntp version */
+#define VN_MASK 0x38
+#define VN(x)   ((x&VN_MASK)>>3)
+#define VN_SET(x,y)     do{ x |= ((y<<3)&VN_MASK); }while(0)
+/* bits 6,7,8 are the ntp mode */
+#define MODE_MASK 0x07
+#define MODE(x) (x&MODE_MASK)
+#define MODE_SET(x,y)   do{ x |= (y&MODE_MASK); }while(0)
+/* here are some values */
+#define MODE_CLIENT 0x03
+
+/**
+ ** a note about the 32-bit "fixed point" numbers:
+ **
+ they are divided into halves, each being a 16-bit int in network byte order:
+ - the first 16 bits are an int on the left side of a decimal point.
+ - the second 16 bits represent a fraction n/(2^16)
+ likewise for the 64-bit "fixed point" numbers with everything doubled :) 
+ **/
+
+/* macros to access the left/right 16 bits of a 32-bit ntp "fixed point"
+   number.  note that these can be used as lvalues too */
+#define L16(x) (((uint16_t*)&x)[0])
+#define R16(x) (((uint16_t*)&x)[1])
+/* macros to access the left/right 32 bits of a 64-bit ntp "fixed point"
+   number.  these too can be used as lvalues */
+#define L32(x) (((uint32_t*)&x)[0])
+#define R32(x) (((uint32_t*)&x)[1])
+
+/* ntp wants seconds since 1/1/00, epoch is 1/1/70.  this is the difference */
+#define EPOCHDIFF 0x83aa7e80UL
+
+/* extract a 32-bit ntp fixed point number into a double */
+#define NTP32asDOUBLE(x) (ntohs(L16(x)) + (double)ntohs(R16(x))/65536.0)
+
+/* likewise for a 64-bit ntp fp number */
+#define NTP64asDOUBLE(n) (double)(((uint64_t)n)?\
+                         (ntohl(L32(n))-EPOCHDIFF) + \
+                         (.00000001*(0.5+(double)(ntohl(R32(n))/42.94967296))):\
+                         0)
+
+/* convert a struct timeval to a double */
+#define TVasDOUBLE(x) (double)(x.tv_sec+(0.000001*x.tv_usec))
+
+/* convert an ntp 64-bit fp number to a struct timeval */
+#define NTP64toTV(n,t) \
+        do{ if(!n) t.tv_sec = t.tv_usec = 0; \
+            else { \
+                        t.tv_sec=ntohl(L32(n))-EPOCHDIFF; \
+                t.tv_usec=(int)(0.5+(double)(ntohl(R32(n))/4294.967296)); \
+                } \
+        }while(0)
+
+/* convert a struct timeval to an ntp 64-bit fp number */
+#define TVtoNTP64(t,n) \
+        do{ if(!t.tv_usec && !t.tv_sec) n=0x0UL; \
+                else { \
+                        L32(n)=htonl(t.tv_sec + EPOCHDIFF); \
+                        R32(n)=htonl((4294.967296*t.tv_usec)+.5); \
+                } \
+        } while(0)
+
+
+/* calculate the offset of the local clock */
+static inline double calc_offset(const ntp_message *m, const struct timeval *t){
+        double client_tx, peer_rx, peer_tx, client_rx, rtdelay;
+        client_tx = NTP64asDOUBLE(m->origts);
+        peer_rx = NTP64asDOUBLE(m->rxts);
+        peer_tx = NTP64asDOUBLE(m->txts);
+        client_rx=TVasDOUBLE((*t));
+        rtdelay=NTP32asDOUBLE(m->rtdelay);
+        return (.5*((peer_tx-client_rx)+(peer_rx-client_tx)))-rtdelay;
+}
+
+/* print out a ntp packet in human readable/debuggable format */
+void print_packet(const ntp_message *p){
+        struct timeval ref, orig, rx, tx;
+
+        NTP64toTV(p->refts,ref);
+        NTP64toTV(p->origts,orig);
+        NTP64toTV(p->rxts,rx);
+        NTP64toTV(p->txts,tx);
+
+        printf("packet contents:\n");
+        printf("\tflags: 0x%.2x\n", p->flags);
+        printf("\t  li=%d (0x%.2x)\n", LI(p->flags), p->flags&LI_MASK);
+        printf("\t  vn=%d (0x%.2x)\n", VN(p->flags), p->flags&VN_MASK);
+        printf("\t  mode=%d (0x%.2x)\n", MODE(p->flags), p->flags&MODE_MASK);
+        printf("\tstratum = %d\n", p->stratum);
+        printf("\tpoll = %g\n", pow(2, p->poll));
+        printf("\tprecision = %g\n", pow(2, p->precision));
+        printf("\trtdelay = %-.16g\n", NTP32asDOUBLE(p->rtdelay));
+        printf("\trtdisp = %-.16g\n", NTP32asDOUBLE(p->rtdisp));
+        printf("\trefid = %x\n", p->refid);
+        printf("\trefts = %-.16g\n", NTP64asDOUBLE(p->refts));
+        printf("\torigts = %-.16g\n", NTP64asDOUBLE(p->origts));
+        printf("\trxts = %-.16g\n", NTP64asDOUBLE(p->rxts));
+        printf("\ttxts = %-.16g\n", NTP64asDOUBLE(p->txts));
+}
+
+void setup_request(ntp_message *p){
+        struct timeval t;
+
+        memset(p, 0, sizeof(ntp_message));
+        LI_SET(p->flags, LI_ALARM);
+        VN_SET(p->flags, 4);
+        MODE_SET(p->flags, MODE_CLIENT);
+        p->poll=4;
+        p->precision=0xfa;
+        L16(p->rtdelay)=htons(1);
+        L16(p->rtdisp)=htons(1);
+
+        gettimeofday(&t, NULL);
+        TVtoNTP64(t,p->txts);
+}
+
+int process_arguments(int argc, char **argv){
+        int c;
+        int option=0;
+        static struct option longopts[] = {
+                {"version", no_argument, 0, 'V'},
+                {"help", no_argument, 0, 'h'},
+                {"verbose", no_argument, 0, 'v'},
+                {"use-ipv4", no_argument, 0, '4'},
+/*              {"use-ipv6", no_argument, 0, '6'}, */
+                {"warning", required_argument, 0, 'w'},
+                {"critical", required_argument, 0, 'c'},
+                {"zero-offset", no_argument, 0, 'O'},
+                {"jwarn", required_argument, 0, 'j'},
+                {"jcrit", required_argument, 0, 'k'},
+                {"timeout", required_argument, 0, 't'},
+                {"hostname", required_argument, 0, 'H'},
+                {0, 0, 0, 0}
+        };
+
+        
+        if (argc < 2)
+                usage ("\n");
+
+        while (1) {
+                c = getopt_long (argc, argv, "Vhv4w:c:Oj:k:t:H:", longopts, &option);
+                if (c == -1 || c == EOF || c == 1)
+                        break;
+
+                switch (c) {
+                case 'h':
+                        print_help();
+                        exit(STATE_OK);
+                        break;
+                case 'V':
+                        print_revision(progname, revision);
+                        exit(STATE_OK);
+                        break;
+                case 'v':
+                        verbose = 1;
+                        break;
+                case 'w':
+                        owarn = atof(optarg);
+                        break;
+                case 'c':
+                        ocrit = atof(optarg);
+                        break;
+                case 'j':
+                        do_jitter=1;
+                        jwarn = atof(optarg);
+                        break;
+                case 'k':
+                        do_jitter=1;
+                        jcrit = atof(optarg);
+                        break;
+                case 'H':
+                        if(is_host(optarg) == FALSE)
+                                usage2(_("Invalid hostname/address"), optarg);
+                        server_address = strdup(optarg);
+                        break;
+                case 't':
+                        socket_timeout=atoi(optarg);
+                        break;
+                case 'O':
+                        zero_offset_bad=1;
+                        break;
+                case '?':
+                        /* print short usage statement if args not parsable */
+                        usage2 (_("Unknown argument"), optarg);
+                        break;
+                }
+        }
+
+        if (ocrit < owarn){
+                usage4(_("Critical offset should be larger than warning offset"));
+        }
+
+        if (ocrit < owarn){
+                usage4(_("Critical jitter should be larger than warning jitter"));
+        }
+
+        if(server_address == NULL){
+                usage4(_("Hostname was not supplied"));
+        }
+
+        return 0;
+}
+
+int main(int argc, char *argv[]){
+        int result = STATE_UNKNOWN;
+        int conn;
+        ntp_message m;
+        struct timeval recv_time;
+        double offset=0, jitter=0;
+
+        if (process_arguments (argc, argv) == ERROR)
+                usage4 (_("Could not parse arguments"));
+
+        /* initialize alarm signal handling */
+        signal (SIGALRM, socket_timeout_alarm_handler);
+
+        /* set socket timeout */
+        alarm (socket_timeout);
+
+        setup_request(&m);
+        if(verbose) print_packet(&m);
+        my_udp_connect(server_address, 123, &conn);
+        write(conn, &m, sizeof(ntp_message));
+        read(conn, &m, sizeof(ntp_message));
+        gettimeofday(&recv_time, NULL);
+        if(verbose) print_packet(&m);
+        close(conn);
+
+        offset=calc_offset(&m, &recv_time);
+        printf("total offset: %g\n", offset);
+
+        if(offset > ocrit){
+                printf("NTP CRITICAL: ");
+                result = STATE_CRITICAL;
+        } else if(offset > owarn) {
+                printf("NTP WARNING: ");
+                result = STATE_WARNING;
+        } else {
+                printf("NTP OK: ");
+                result = STATE_OK;
+        }
+
+        /* not implemented yet:
+        jitter=calc_jitter(&m, &recv_time);
+
+        if(do_jitter){
+                if(offset > ocrit){
+                        printf("NTP CRITICAL: ");
+                        result = STATE_CRITICAL;
+                } else if(offset > owarn) {
+                        printf("NTP WARNING: ");
+                        result = STATE_WARNING;
+                } else {
+                        printf("NTP OK: ");
+                        result = STATE_OK;
+                }
+        }
+        */
+
+        printf("Offset %g secs|offset=%g\n", offset, offset);
+
+        if(server_address!=NULL) free(server_address);
+        return result;
+}
+
+
+void print_usage(void){
+        printf("\
+Usage: %s -H <host> [-O] [-w <warn>] [-c <crit>] [-j <warn>] [-k <crit>] [-v verbose]\
+\n", progname);
+}
+
+void print_help(void){
+        print_revision(progname, revision);
+
+        printf ("Copyright (c) 1999 Ethan Galstad\n");
+        printf (COPYRIGHT, copyright, email);
+
+        print_usage();
+        printf (_(UT_HELP_VRSN));
+        printf (_(UT_HOST_PORT), 'p', "123");
+        printf (_(UT_WARN_CRIT));
+        printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
+        printf (_(UT_VERBOSE));
+        printf(_(UT_SUPPORT));
+}