plugins-root/check_dhcp.c

   1 /******************************************************************************
   2 *
   3 * Nagios check_dhcp plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
   7 * Copyright (c) 2001-2006 Nagios Plugin Development Team
   8 *
   9 * Last Modified: $Date$
  10 *
  11 * Description:
  12 *
  13 * This file contains the check_dhcp plugin
  14 *
  15 *  This plugin tests the availability of DHCP servers on a network.
  16 *
  17 *
  18 * License Information:
  19 *
  20 * This program is free software; you can redistribute it and/or modify
  21 * it under the terms of the GNU General Public License as published by
  22 * the Free Software Foundation; either version 2 of the License, or
  23 * (at your option) any later version.
  24 *
  25 * This program is distributed in the hope that it will be useful,
  26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28 * GNU General Public License for more details.
  29 *
  30 * You should have received a copy of the GNU General Public License
  31 * along with this program; if not, write to the Free Software
  32 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  33 *
  34 * $Id$
  35 *
  36 *****************************************************************************/
  37
  38 const char *progname = "check_dhcp";
  39 const char *revision = "$Revision$";
  40 const char *copyright = "2001-2006";
  41 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  42
  43 #include "common.h"
  44 #include "netutils.h"
  45 #include "utils.h"
  46
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <errno.h>
  51 #include <unistd.h>
  52 #include <sys/time.h>
  53 #include <sys/ioctl.h>
  54 #include <fcntl.h>
  55 #include <getopt.h>
  56 #include <sys/socket.h>
  57 #include <sys/types.h>
  58 #include <netdb.h>
  59 #include <netinet/in.h>
  60 #include <net/if.h>
  61 #include <arpa/inet.h>
  62
  63 #if defined( __linux__ )
  64
  65 #include <linux/if_ether.h>
  66 #include <features.h>
  67
  68 #elif defined (__bsd__)
  69
  70 #include <netinet/if_ether.h>
  71 #include <sys/param.h>
  72 #include <sys/sysctl.h>
  73 #include <net/if_dl.h>
  74
  75 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
  76
  77 #define INSAP 22
  78 #define OUTSAP 24
  79
  80 #include <signal.h>
  81 #include <ctype.h>
  82 #include <sys/stropts.h>
  83 #include <sys/poll.h>
  84 #include <sys/dlpi.h>
  85
  86 #define bcopy(source, destination, length) memcpy(destination, source, length)
  87
  88 #define AREA_SZ 5000            /* buffer length in bytes */
  89 static u_long ctl_area[AREA_SZ];
  90 static u_long dat_area[AREA_SZ];
  91 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
  92 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
  93
  94 #define GOT_CTRL 1
  95 #define GOT_DATA 2
  96 #define GOT_BOTH 3
  97 #define GOT_INTR 4
  98 #define GOT_ERR 128
  99
 100 #define u_int8_t         uint8_t
 101 #define u_int16_t       uint16_t
 102 #define u_int32_t       uint32_t
 103
 104 static int get_msg(int);
 105 static int check_ctrl(int);
 106 static int put_ctrl(int, int, int);
 107 static int put_both(int, int, int, int);
 108 static int dl_open(const char *, int, int *);
 109 static int dl_bind(int, int, u_char *);
 110 long mac_addr_dlpi( const char *, int, u_char *);
 111
 112 #endif
 113
 114
 115
 116 /**** Common definitions ****/
 117
 118 #define OK                0
 119 #define ERROR             -1
 120
 121 #define FALSE             0
 122 #define TRUE              1
 123
 124
 125 /**** DHCP definitions ****/
 126
 127 #define MAX_DHCP_CHADDR_LENGTH           16
 128 #define MAX_DHCP_SNAME_LENGTH            64
 129 #define MAX_DHCP_FILE_LENGTH             128
 130 #define MAX_DHCP_OPTIONS_LENGTH          312
 131
 132
 133 typedef struct dhcp_packet_struct{
 134         u_int8_t  op;                   /* packet type */
 135         u_int8_t  htype;                /* type of hardware address for this machine (Ethernet, etc) */
 136         u_int8_t  hlen;                 /* length of hardware address (of this machine) */
 137         u_int8_t  hops;                 /* hops */
 138         u_int32_t xid;                  /* random transaction id number - chosen by this machine */
 139         u_int16_t secs;                 /* seconds used in timing */
 140         u_int16_t flags;                /* flags */
 141         struct in_addr ciaddr;          /* IP address of this machine (if we already have one) */
 142         struct in_addr yiaddr;          /* IP address of this machine (offered by the DHCP server) */
 143         struct in_addr siaddr;          /* IP address of DHCP server */
 144         struct in_addr giaddr;          /* IP address of DHCP relay */
 145         unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH];      /* hardware address of this machine */
 146         char sname [MAX_DHCP_SNAME_LENGTH];    /* name of DHCP server */
 147         char file [MAX_DHCP_FILE_LENGTH];      /* boot file name (used for diskless booting?) */
 148         char options[MAX_DHCP_OPTIONS_LENGTH];  /* options */
 149         }dhcp_packet;
 150
 151
 152 typedef struct dhcp_offer_struct{
 153         struct in_addr server_address;   /* address of DHCP server that sent this offer */
 154         struct in_addr offered_address;  /* the IP address that was offered to us */
 155         u_int32_t lease_time;            /* lease time in seconds */
 156         u_int32_t renewal_time;          /* renewal time in seconds */
 157         u_int32_t rebinding_time;        /* rebinding time in seconds */
 158         struct dhcp_offer_struct *next;
 159         }dhcp_offer;
 160
 161
 162 typedef struct requested_server_struct{
 163         struct in_addr server_address;
 164         int answered;
 165         struct requested_server_struct *next;
 166         }requested_server;
 167
 168
 169 #define BOOTREQUEST     1
 170 #define BOOTREPLY       2
 171
 172 #define DHCPDISCOVER    1
 173 #define DHCPOFFER       2
 174 #define DHCPREQUEST     3
 175 #define DHCPDECLINE     4
 176 #define DHCPACK         5
 177 #define DHCPNACK        6
 178 #define DHCPRELEASE     7
 179
 180 #define DHCP_OPTION_MESSAGE_TYPE        53
 181 #define DHCP_OPTION_HOST_NAME           12
 182 #define DHCP_OPTION_BROADCAST_ADDRESS   28
 183 #define DHCP_OPTION_REQUESTED_ADDRESS   50
 184 #define DHCP_OPTION_LEASE_TIME          51
 185 #define DHCP_OPTION_SERVER_IDENTIFIER   54
 186 #define DHCP_OPTION_RENEWAL_TIME        58
 187 #define DHCP_OPTION_REBINDING_TIME      59
 188
 189 #define DHCP_INFINITE_TIME              0xFFFFFFFF
 190
 191 #define DHCP_BROADCAST_FLAG 32768
 192
 193 #define DHCP_SERVER_PORT   67
 194 #define DHCP_CLIENT_PORT   68
 195
 196 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 197 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 198
 199 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 200
 201 char network_interface_name[IFNAMSIZ]="eth0";
 202
 203 u_int32_t packet_xid=0;
 204
 205 u_int32_t dhcp_lease_time=0;
 206 u_int32_t dhcp_renewal_time=0;
 207 u_int32_t dhcp_rebinding_time=0;
 208
 209 int dhcpoffer_timeout=2;
 210
 211 dhcp_offer *dhcp_offer_list=NULL;
 212 requested_server *requested_server_list=NULL;
 213
 214 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 215 int requested_servers=0;
 216 int requested_responses=0;
 217
 218 int request_specific_address=FALSE;
 219 int received_requested_address=FALSE;
 220 int verbose=0;
 221 struct in_addr requested_address;
 222
 223
 224 int process_arguments(int, char **);
 225 int call_getopt(int, char **);
 226 int validate_arguments(void);
 227 void print_usage(void);
 228 void print_help(void);
 229
 230 int get_hardware_address(int,char *);
 231
 232 int send_dhcp_discover(int);
 233 int get_dhcp_offer(int);
 234
 235 int get_results(void);
 236
 237 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 238 int free_dhcp_offer_list(void);
 239 int free_requested_server_list(void);
 240
 241 int create_dhcp_socket(void);
 242 int close_dhcp_socket(int);
 243 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 244 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 245
 246
 247
 248 int main(int argc, char **argv){
 249         int dhcp_socket;
 250         int result = STATE_UNKNOWN;
 251
 252         setlocale (LC_ALL, "");
 253         bindtextdomain (PACKAGE, LOCALEDIR);
 254         textdomain (PACKAGE);
 255
 256         if(process_arguments(argc,argv)!=OK){
 257                 usage4 (_("Could not parse arguments"));
 258                 }
 259
 260         /* create socket for DHCP communications */
 261         dhcp_socket=create_dhcp_socket();
 262
 263         /* get hardware address of client machine */
 264         get_hardware_address(dhcp_socket,network_interface_name);
 265
 266         /* send DHCPDISCOVER packet */
 267         send_dhcp_discover(dhcp_socket);
 268
 269         /* wait for a DHCPOFFER packet */
 270         get_dhcp_offer(dhcp_socket);
 271
 272         /* close socket we created */
 273         close_dhcp_socket(dhcp_socket);
 274
 275         /* determine state/plugin output to return */
 276         result=get_results();
 277
 278         /* free allocated memory */
 279         free_dhcp_offer_list();
 280         free_requested_server_list();
 281
 282         return result;
 283         }
 284
 285
 286
 287 /* determines hardware address on client machine */
 288 int get_hardware_address(int sock,char *interface_name){
 289
 290         int i;
 291
 292 #if defined(__linux__)
 293         struct ifreq ifr;
 294
 295         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
 296
 297         /* try and grab hardware address of requested interface */
 298         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 299                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 300                 exit(STATE_UNKNOWN);
 301                 }
 302
 303         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 304
 305 #elif defined(__bsd__)
 306                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 307
 308         int                     mib[6], len;
 309         char                    *buf;
 310         unsigned char           *ptr;
 311         struct if_msghdr        *ifm;
 312         struct sockaddr_dl      *sdl;
 313
 314         mib[0] = CTL_NET;
 315         mib[1] = AF_ROUTE;
 316         mib[2] = 0;
 317         mib[3] = AF_LINK;
 318         mib[4] = NET_RT_IFLIST;
 319
 320         if((mib[5] = if_nametoindex(interface_name)) == 0){
 321                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 322                 exit(STATE_UNKNOWN);
 323                 }
 324
 325         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 326                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 327                 exit(STATE_UNKNOWN);
 328                 }
 329
 330         if((buf = malloc(len)) == NULL){
 331                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 332                 exit(4);
 333                 }
 334
 335         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 336                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 337                 exit(STATE_UNKNOWN);
 338                 }
 339
 340         ifm = (struct if_msghdr *)buf;
 341         sdl = (struct sockaddr_dl *)(ifm + 1);
 342         ptr = (unsigned char *)LLADDR(sdl);
 343         memcpy(&client_hardware_address[0], ptr, 6) ;
 344                                                 /* King 2004 */
 345
 346 #elif defined(__sun__) || defined(__solaris__)
 347
 348                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 349         long stat;
 350         char dev[20] = "/dev/";
 351         char *p;
 352         int unit;
 353
 354         for(p = interface_name; *p && isalpha(*p); p++)
 355                 /* no-op */ ;
 356         if( p != '\0' ){
 357                 unit = atoi(p) ;
 358                 *p = '\0' ;
 359                 strncat(dev, interface_name, 6) ;
 360                 }
 361         else{
 362                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 363                 exit(STATE_UNKNOWN);
 364                 }
 365         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 366         if(stat != 0){
 367                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 368                 exit(STATE_UNKNOWN);
 369                 }
 370
 371 #elif defined(__hpux__)
 372
 373         long stat;
 374         char dev[20] = "/dev/dlpi" ;
 375         int unit = 0;
 376
 377         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 378         if(stat != 0){
 379                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 380                 exit(STATE_UNKNOWN);
 381                 }
 382                                                 /* Kompf 2000-2003 */
 383
 384 #else
 385         printf(_("Error: can't get MAC address for this architecture.\n"));
 386         exit(STATE_UNKNOWN);
 387 #endif
 388
 389         if(verbose){
 390                 printf(_("Hardware address: "));
 391                 for (i=0; i<6; ++i)
 392                         printf("%2.2x", client_hardware_address[i]);
 393                 printf( "\n");
 394                 }
 395
 396         return OK;
 397         }
 398
 399
 400 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 401 int send_dhcp_discover(int sock){
 402         dhcp_packet discover_packet;
 403         struct sockaddr_in sockaddr_broadcast;
 404
 405
 406         /* clear the packet data structure */
 407         bzero(&discover_packet,sizeof(discover_packet));
 408
 409
 410         /* boot request flag (backward compatible with BOOTP servers) */
 411         discover_packet.op=BOOTREQUEST;
 412
 413         /* hardware address type */
 414         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 415
 416         /* length of our hardware address */
 417         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 418
 419         discover_packet.hops=0;
 420
 421         /* transaction id is supposed to be random */
 422         srand(time(NULL));
 423         packet_xid=random();
 424         discover_packet.xid=htonl(packet_xid);
 425
 426         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 427         /* downright bizzarre... */
 428         ntohl(discover_packet.xid);
 429
 430         /*discover_packet.secs=htons(65535);*/
 431         discover_packet.secs=0xFF;
 432
 433         /* tell server it should broadcast its response */
 434         discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
 435
 436         /* our hardware address */
 437         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 438
 439         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 440         discover_packet.options[0]='\x63';
 441         discover_packet.options[1]='\x82';
 442         discover_packet.options[2]='\x53';
 443         discover_packet.options[3]='\x63';
 444
 445         /* DHCP message type is embedded in options field */
 446         discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 447         discover_packet.options[5]='\x01';               /* DHCP message option length in bytes */
 448         discover_packet.options[6]=DHCPDISCOVER;
 449
 450         /* the IP address we're requesting */
 451         if(request_specific_address==TRUE){
 452                 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
 453                 discover_packet.options[8]='\x04';
 454                 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
 455                 }
 456
 457         /* send the DHCPDISCOVER packet to broadcast address */
 458         sockaddr_broadcast.sin_family=AF_INET;
 459         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 460         sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
 461         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 462
 463
 464         if(verbose){
 465                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 466                 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 467                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 468                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 469                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 470                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 471                 }
 472
 473         /* send the DHCPDISCOVER packet out */
 474         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 475
 476         if(verbose)
 477                 printf("\n\n");
 478
 479         return OK;
 480         }
 481
 482
 483
 484
 485 /* waits for a DHCPOFFER message from one or more DHCP servers */
 486 int get_dhcp_offer(int sock){
 487         dhcp_packet offer_packet;
 488         struct sockaddr_in source;
 489         struct sockaddr_in via;
 490         int result=OK;
 491         int timeout=1;
 492         int responses=0;
 493         int x;
 494         time_t start_time;
 495         time_t current_time;
 496
 497         time(&start_time);
 498
 499         /* receive as many responses as we can */
 500         for(responses=0,valid_responses=0;;){
 501
 502                 time(&current_time);
 503                 if((current_time-start_time)>=dhcpoffer_timeout)
 504                         break;
 505
 506                 if(verbose)
 507                         printf("\n\n");
 508
 509                 bzero(&source,sizeof(source));
 510                 bzero(&via,sizeof(via));
 511                 bzero(&offer_packet,sizeof(offer_packet));
 512
 513                 result=OK;
 514                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 515
 516                 if(result!=OK){
 517                         if(verbose)
 518                                 printf(_("Result=ERROR\n"));
 519
 520                         continue;
 521                         }
 522                 else{
 523                         if(verbose)
 524                                 printf(_("Result=OK\n"));
 525
 526                         responses++;
 527                         }
 528
 529                 /* The "source" is either a server or a relay. */
 530                 /* Save a copy of "source" into "via" even if it's via itself */
 531                 memcpy(&via,&source,sizeof(source)) ;
 532
 533                 /* If siaddr is non-zero, set "source" to siaddr */
 534                 if(offer_packet.siaddr.s_addr != 0L){
 535                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 536                         }
 537
 538                 if(verbose){
 539                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 540                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 541                         printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 542                         }
 543
 544                 /* check packet xid to see if its the same as the one we used in the discover packet */
 545                 if(ntohl(offer_packet.xid)!=packet_xid){
 546                         if(verbose)
 547                                 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 548
 549                         continue;
 550                         }
 551
 552                 /* check hardware address */
 553                 result=OK;
 554                 if(verbose)
 555                         printf("DHCPOFFER chaddr: ");
 556
 557                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 558                         if(verbose)
 559                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 560
 561                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 562                                 result=ERROR;
 563                         }
 564                 if(verbose)
 565                         printf("\n");
 566
 567                 if(result==ERROR){
 568                         if(verbose)
 569                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 570
 571                         continue;
 572                         }
 573
 574                 if(verbose){
 575                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 576                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 577                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 578                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 579                         }
 580
 581                 add_dhcp_offer(source.sin_addr,&offer_packet);
 582
 583                 valid_responses++;
 584                 }
 585
 586         if(verbose){
 587                 printf(_("Total responses seen on the wire: %d\n"),responses);
 588                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 589                 }
 590
 591         return OK;
 592         }
 593
 594
 595
 596 /* sends a DHCP packet */
 597 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 598         struct sockaddr_in myname;
 599         int result;
 600
 601         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 602
 603         if(verbose)
 604                 printf(_("send_dhcp_packet result: %d\n"),result);
 605
 606         if(result<0)
 607                 return ERROR;
 608
 609         return OK;
 610         }
 611
 612
 613
 614 /* receives a DHCP packet */
 615 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 616         struct timeval tv;
 617         fd_set readfds;
 618         int recv_result;
 619         socklen_t address_size;
 620         struct sockaddr_in source_address;
 621
 622
 623         /* wait for data to arrive (up time timeout) */
 624         tv.tv_sec=timeout;
 625         tv.tv_usec=0;
 626         FD_ZERO(&readfds);
 627         FD_SET(sock,&readfds);
 628         select(sock+1,&readfds,NULL,NULL,&tv);
 629
 630         /* make sure some data has arrived */
 631         if(!FD_ISSET(sock,&readfds)){
 632                 if(verbose)
 633                         printf(_("No (more) data received\n"));
 634                 return ERROR;
 635                 }
 636
 637         else{
 638
 639                 /* why do we need to peek first?  i don't know, its a hack.  without it, the source address of the first packet received was
 640                    not being interpreted correctly.  sigh... */
 641                 bzero(&source_address,sizeof(source_address));
 642                 address_size=sizeof(source_address);
 643                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 644                 if(verbose)
 645                         printf("recv_result_1: %d\n",recv_result);
 646                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 647                 if(verbose)
 648                         printf("recv_result_2: %d\n",recv_result);
 649
 650                 if(recv_result==-1){
 651                         if(verbose){
 652                                 printf(_("recvfrom() failed, "));
 653                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 654                                 }
 655                         return ERROR;
 656                         }
 657                 else{
 658                         if(verbose){
 659                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 660                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 661                                 }
 662
 663                         memcpy(address,&source_address,sizeof(source_address));
 664                         return OK;
 665                         }
 666                 }
 667
 668         return OK;
 669         }
 670
 671
 672 /* creates a socket for DHCP communication */
 673 int create_dhcp_socket(void){
 674         struct sockaddr_in myname;
 675         struct ifreq interface;
 676         int sock;
 677         int flag=1;
 678
 679         /* Set up the address we're going to bind to. */
 680         bzero(&myname,sizeof(myname));
 681         myname.sin_family=AF_INET;
 682         myname.sin_port=htons(DHCP_CLIENT_PORT);
 683         myname.sin_addr.s_addr=INADDR_ANY;                 /* listen on any address */
 684         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 685
 686         /* create a socket for DHCP communications */
 687         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 688         if(sock<0){
 689                 printf(_("Error: Could not create socket!\n"));
 690                 exit(STATE_UNKNOWN);
 691                 }
 692
 693         if(verbose)
 694                 printf("DHCP socket: %d\n",sock);
 695
 696         /* set the reuse address flag so we don't get errors when restarting */
 697         flag=1;
 698         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 699                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 700                 exit(STATE_UNKNOWN);
 701                 }
 702
 703         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 704         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 705                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 706                 exit(STATE_UNKNOWN);
 707                 }
 708
 709         /* bind socket to interface */
 710 #if defined(__linux__)
 711         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
 712         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 713                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 714                 exit(STATE_UNKNOWN);
 715                 }
 716
 717 #else
 718         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
 719 #endif
 720
 721         /* bind the socket */
 722         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 723                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 724                 exit(STATE_UNKNOWN);
 725                 }
 726
 727         return sock;
 728         }
 729
 730
 731 /* closes DHCP socket */
 732 int close_dhcp_socket(int sock){
 733
 734         close(sock);
 735
 736         return OK;
 737         }
 738
 739
 740 /* adds a requested server address to list in memory */
 741 int add_requested_server(struct in_addr server_address){
 742         requested_server *new_server;
 743
 744         new_server=(requested_server *)malloc(sizeof(requested_server));
 745         if(new_server==NULL)
 746                 return ERROR;
 747
 748         new_server->server_address=server_address;
 749         new_server->answered=FALSE;
 750
 751         new_server->next=requested_server_list;
 752         requested_server_list=new_server;
 753
 754         requested_servers++;
 755
 756         if(verbose)
 757                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 758
 759         return OK;
 760         }
 761
 762
 763
 764
 765 /* adds a DHCP OFFER to list in memory */
 766 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 767         dhcp_offer *new_offer;
 768         int x;
 769         unsigned option_type;
 770         unsigned option_length;
 771         struct in_addr serv_ident = {0};
 772
 773         if(offer_packet==NULL)
 774                 return ERROR;
 775
 776         /* process all DHCP options present in the packet */
 777         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 778
 779                 /* end of options (0 is really just a pad, but bail out anyway) */
 780                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 781                         break;
 782
 783                 /* get option type */
 784                 option_type=offer_packet->options[x++];
 785
 786                 /* get option length */
 787                 option_length=offer_packet->options[x++];
 788
 789                 if(verbose)
 790                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 791
 792                 /* get option data */
 793                 switch(option_type){
 794                 case DHCP_OPTION_LEASE_TIME:
 795                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 796                         dhcp_lease_time = ntohl(dhcp_lease_time);
 797                         break;
 798                 case DHCP_OPTION_RENEWAL_TIME:
 799                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 800                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 801                         break;
 802                 case DHCP_OPTION_REBINDING_TIME:
 803                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 804                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 805                         break;
 806                 case DHCP_OPTION_SERVER_IDENTIFIER:
 807                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 808                         break;
 809                         }
 810
 811                 /* skip option data we're ignoring */
 812                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 813                         x+=option_length;
 814                 }
 815
 816         if(verbose){
 817                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 818                         printf(_("Lease Time: Infinite\n"));
 819                 else
 820                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 821                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 822                         printf(_("Renewal Time: Infinite\n"));
 823                 else
 824                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 825                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 826                         printf(_("Rebinding Time: Infinite\n"));
 827                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 828                 }
 829
 830         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 831
 832         if(new_offer==NULL)
 833                 return ERROR;
 834
 835         /*
 836          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 837          * 'siaddr' field as the address of the server to use in the next step
 838          * of the client's bootstrap process.  A DHCP server may return its own
 839          * address in the 'siaddr' field, if the server is prepared to supply
 840          * the next bootstrap service (e.g., delivery of an operating system
 841          * executable image).  A DHCP server always returns its own address in
 842          * the 'server identifier' option."  'serv_ident' is the 'server
 843          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 844          * wasn't available) the IP address we received the DHCPOFFER from.  If
 845          * 'serv_ident' isn't available for some reason, we use 'source'.
 846          */
 847         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 848         new_offer->offered_address=offer_packet->yiaddr;
 849         new_offer->lease_time=dhcp_lease_time;
 850         new_offer->renewal_time=dhcp_renewal_time;
 851         new_offer->rebinding_time=dhcp_rebinding_time;
 852
 853
 854         if(verbose){
 855                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 856                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 857                 }
 858
 859         /* add new offer to head of list */
 860         new_offer->next=dhcp_offer_list;
 861         dhcp_offer_list=new_offer;
 862
 863         return OK;
 864         }
 865
 866
 867 /* frees memory allocated to DHCP OFFER list */
 868 int free_dhcp_offer_list(void){
 869         dhcp_offer *this_offer;
 870         dhcp_offer *next_offer;
 871
 872         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 873                 next_offer=this_offer->next;
 874                 free(this_offer);
 875                 }
 876
 877         return OK;
 878         }
 879
 880
 881 /* frees memory allocated to requested server list */
 882 int free_requested_server_list(void){
 883         requested_server *this_server;
 884         requested_server *next_server;
 885
 886         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 887                 next_server=this_server->next;
 888                 free(this_server);
 889                 }
 890
 891         return OK;
 892         }
 893
 894
 895 /* gets state and plugin output to return */
 896 int get_results(void){
 897         dhcp_offer *temp_offer;
 898         requested_server *temp_server;
 899         int result;
 900         u_int32_t max_lease_time=0;
 901
 902         received_requested_address=FALSE;
 903
 904         /* checks responses from requested servers */
 905         requested_responses=0;
 906         if(requested_servers>0){
 907
 908                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 909
 910                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 911
 912                                 /* get max lease time we were offered */
 913                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 914                                         max_lease_time=temp_offer->lease_time;
 915
 916                                 /* see if we got the address we requested */
 917                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 918                                         received_requested_address=TRUE;
 919
 920                                 /* see if the servers we wanted a response from talked to us or not */
 921                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 922                                         if(verbose){
 923                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 924                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 925                                                 if(temp_server->answered)
 926                                                         printf(_(" (duplicate)"));
 927                                                 printf(_("\n"));
 928                                                 }
 929                                         if(temp_server->answered == FALSE){
 930                                                 requested_responses++;
 931                                                 temp_server->answered=TRUE;
 932                                                 }
 933                                         }
 934                                 }
 935                         }
 936
 937                 }
 938
 939         /* else check and see if we got our requested address from any server */
 940         else{
 941
 942                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 943
 944                         /* get max lease time we were offered */
 945                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 946                                 max_lease_time=temp_offer->lease_time;
 947
 948                         /* see if we got the address we requested */
 949                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 950                                 received_requested_address=TRUE;
 951                         }
 952                 }
 953
 954         result=STATE_OK;
 955         if(valid_responses==0)
 956                 result=STATE_CRITICAL;
 957         else if(requested_servers>0 && requested_responses==0)
 958                 result=STATE_CRITICAL;
 959         else if(requested_responses<requested_servers)
 960                 result=STATE_WARNING;
 961         else if(request_specific_address==TRUE && received_requested_address==FALSE)
 962                 result=STATE_WARNING;
 963
 964         if(result==0)               /* garrett honeycutt 2005 */
 965                 printf("OK: ");
 966         else if(result==1)
 967                 printf("WARNING: ");
 968         else if(result==2)
 969                 printf("CRITICAL: ");
 970         else if(result==3)
 971                 printf("UNKNOWN: ");
 972
 973         /* we didn't receive any DHCPOFFERs */
 974         if(dhcp_offer_list==NULL){
 975                 printf(_("No DHCPOFFERs were received.\n"));
 976                 return result;
 977                 }
 978
 979         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
 980
 981         if(requested_servers>0)
 982                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
 983
 984         if(request_specific_address==TRUE)
 985                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
 986
 987         printf(_(", max lease time = "));
 988         if(max_lease_time==DHCP_INFINITE_TIME)
 989                 printf(_("Infinity"));
 990         else
 991                 printf("%lu sec",(unsigned long)max_lease_time);
 992
 993         printf(".\n");
 994
 995         return result;
 996         }
 997
 998
 999 /* process command-line arguments */
1000 int process_arguments(int argc, char **argv){
1001         int c;
1002
1003         if(argc<1)
1004                 return ERROR;
1005
1006         c=0;
1007         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1008
1009                 /*
1010                 if(is_option(argv[c]))
1011                         continue;
1012                 */
1013                 }
1014
1015         return validate_arguments();
1016         }
1017
1018
1019
1020 int call_getopt(int argc, char **argv){
1021         int c=0;
1022         int i=0;
1023         struct in_addr ipaddress;
1024
1025         int option_index = 0;
1026         static struct option long_options[] =
1027         {
1028                 {"serverip",       required_argument,0,'s'},
1029                 {"requestedip",    required_argument,0,'r'},
1030                 {"timeout",        required_argument,0,'t'},
1031                 {"interface",      required_argument,0,'i'},
1032                 {"verbose",        no_argument,      0,'v'},
1033                 {"version",        no_argument,      0,'V'},
1034                 {"help",           no_argument,      0,'h'},
1035                 {0,0,0,0}
1036         };
1037
1038         while(1){
1039                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1040
1041                 i++;
1042
1043                 if(c==-1||c==EOF||c==1)
1044                         break;
1045
1046                 switch(c){
1047                 case 'w':
1048                 case 'r':
1049                 case 't':
1050                 case 'i':
1051                         i++;
1052                         break;
1053                 default:
1054                         break;
1055                         }
1056
1057                 switch(c){
1058
1059                 case 's': /* DHCP server address */
1060                         if(inet_aton(optarg,&ipaddress))
1061                                 add_requested_server(ipaddress);
1062                         /*
1063                         else
1064                                 usage("Invalid server IP address\n");
1065                         */
1066                         break;
1067
1068                 case 'r': /* address we are requested from DHCP servers */
1069                         if(inet_aton(optarg,&ipaddress)){
1070                                 requested_address=ipaddress;
1071                                 request_specific_address=TRUE;
1072                                 }
1073                         /*
1074                         else
1075                                 usage("Invalid requested IP address\n");
1076                         */
1077                         break;
1078
1079                 case 't': /* timeout */
1080
1081                         /*
1082                         if(is_intnonneg(optarg))
1083                         */
1084                         if(atoi(optarg)>0)
1085                                 dhcpoffer_timeout=atoi(optarg);
1086                         /*
1087                         else
1088                                 usage("Time interval must be a nonnegative integer\n");
1089                         */
1090                         break;
1091
1092                 case 'i': /* interface name */
1093
1094                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1095                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1096
1097                         break;
1098
1099                 case 'V': /* version */
1100                         print_revision(progname,revision);
1101                         exit(STATE_OK);
1102
1103                 case 'h': /* help */
1104                         print_help();
1105                         exit(STATE_OK);
1106
1107                 case 'v': /* verbose */
1108                         verbose=1;
1109                         break;
1110
1111                 case '?': /* help */
1112                         usage5 ();
1113                         break;
1114
1115                 default:
1116                         break;
1117                         }
1118                 }
1119
1120         return i;
1121         }
1122
1123
1124 int validate_arguments(void){
1125
1126         return OK;
1127         }
1128
1129
1130 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1131 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1132
1133 /* get a message from a stream; return type of message */
1134 static int get_msg(int fd){
1135         int flags = 0;
1136         int res, ret;
1137         ctl_area[0] = 0;
1138         dat_area[0] = 0;
1139         ret = 0;
1140         res = getmsg(fd, &ctl, &dat, &flags);
1141
1142         if(res < 0){
1143                 if(errno == EINTR){
1144                         return(GOT_INTR);
1145                         }
1146                 else{
1147                         printf("%s\n", "get_msg FAILED.");
1148                         return(GOT_ERR);
1149                         }
1150                 }
1151         if(ctl.len > 0){
1152                 ret |= GOT_CTRL;
1153                 }
1154         if(dat.len > 0){
1155                 ret |= GOT_DATA;
1156                 }
1157
1158         return(ret);
1159         }
1160
1161 /* verify that dl_primitive in ctl_area = prim */
1162 static int check_ctrl(int prim){
1163         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1164
1165         if(err_ack->dl_primitive != prim){
1166                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1167                 exit(STATE_UNKNOWN);
1168                 }
1169
1170         return 0;
1171         }
1172
1173 /* put a control message on a stream */
1174 static int put_ctrl(int fd, int len, int pri){
1175
1176         ctl.len = len;
1177         if(putmsg(fd, &ctl, 0, pri) < 0){
1178                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1179                 exit(STATE_UNKNOWN);
1180                 }
1181
1182         return  0;
1183         }
1184
1185 /* put a control + data message on a stream */
1186 static int put_both(int fd, int clen, int dlen, int pri){
1187
1188         ctl.len = clen;
1189         dat.len = dlen;
1190         if(putmsg(fd, &ctl, &dat, pri) < 0){
1191                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1192                 exit(STATE_UNKNOWN);
1193                 }
1194
1195         return  0;
1196         }
1197
1198 /* open file descriptor and attach */
1199 static int dl_open(const char *dev, int unit, int *fd){
1200         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1201
1202         if((*fd = open(dev, O_RDWR)) == -1){
1203                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1204                 exit(STATE_UNKNOWN);
1205                 }
1206         attach_req->dl_primitive = DL_ATTACH_REQ;
1207         attach_req->dl_ppa = unit;
1208         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1209         get_msg(*fd);
1210         return check_ctrl(DL_OK_ACK);
1211         }
1212
1213 /* send DL_BIND_REQ */
1214 static int dl_bind(int fd, int sap, u_char *addr){
1215         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1216         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1217
1218         bind_req->dl_primitive = DL_BIND_REQ;
1219         bind_req->dl_sap = sap;
1220         bind_req->dl_max_conind = 1;
1221         bind_req->dl_service_mode = DL_CLDLS;
1222         bind_req->dl_conn_mgmt = 0;
1223         bind_req->dl_xidtest_flg = 0;
1224         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1225         get_msg(fd);
1226         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1227                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1228                 exit(STATE_UNKNOWN);
1229                 }
1230         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1231               bind_ack->dl_addr_length);
1232
1233         return 0;
1234         }
1235
1236 /***********************************************************************
1237  * interface:
1238  * function mac_addr_dlpi - get the mac address of the interface with
1239  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1240  *
1241  * parameter: addr: an array of six bytes, has to be allocated by the caller
1242  *
1243  * return: 0 if OK, -1 if the address could not be determined
1244  *
1245  *
1246  ***********************************************************************/
1247
1248 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1249         int fd;
1250         u_char mac_addr[25];
1251
1252         if(GOT_ERR != dl_open(dev, unit, &fd)){
1253                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1254                         bcopy( mac_addr, addr, 6);
1255                         return 0;
1256                         }
1257                 }
1258         close(fd);
1259
1260         return -1;
1261         }
1262
1263 /* Kompf 2000-2003 */
1264 #endif
1265
1266
1267 /* print usage help */
1268 void print_help(void){
1269
1270         print_revision(progname,revision);
1271
1272         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1273         printf (COPYRIGHT, copyright, email);
1274
1275         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1276
1277   printf ("\n\n");
1278
1279         print_usage();
1280
1281         printf (_(UT_HELP_VRSN));
1282
1283         printf (_(UT_VERBOSE));
1284
1285         printf (" %s\n", "-s, --serverip=IPADDRESS");
1286   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1287   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1288   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1289   printf (" %s\n", "-t, --timeout=INTEGER");
1290   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1291   printf (" %s\n", "-i, --interface=STRING");
1292   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1293
1294         return;
1295         }
1296
1297
1298 void
1299 print_usage(void){
1300
1301   printf (_("Usage:"));
1302   printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1303
1304         return;
1305         }
1306
1307
1308