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 responses=0;
 492         int x;
 493         time_t start_time;
 494         time_t current_time;
 495
 496         time(&start_time);
 497
 498         /* receive as many responses as we can */
 499         for(responses=0,valid_responses=0;;){
 500
 501                 time(&current_time);
 502                 if((current_time-start_time)>=dhcpoffer_timeout)
 503                         break;
 504
 505                 if(verbose)
 506                         printf("\n\n");
 507
 508                 bzero(&source,sizeof(source));
 509                 bzero(&via,sizeof(via));
 510                 bzero(&offer_packet,sizeof(offer_packet));
 511
 512                 result=OK;
 513                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 514
 515                 if(result!=OK){
 516                         if(verbose)
 517                                 printf(_("Result=ERROR\n"));
 518
 519                         continue;
 520                         }
 521                 else{
 522                         if(verbose)
 523                                 printf(_("Result=OK\n"));
 524
 525                         responses++;
 526                         }
 527
 528                 /* The "source" is either a server or a relay. */
 529                 /* Save a copy of "source" into "via" even if it's via itself */
 530                 memcpy(&via,&source,sizeof(source)) ;
 531
 532                 /* If siaddr is non-zero, set "source" to siaddr */
 533                 if(offer_packet.siaddr.s_addr != 0L){
 534                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 535                         }
 536
 537                 if(verbose){
 538                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 539                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 540                         printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 541                         }
 542
 543                 /* check packet xid to see if its the same as the one we used in the discover packet */
 544                 if(ntohl(offer_packet.xid)!=packet_xid){
 545                         if(verbose)
 546                                 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 547
 548                         continue;
 549                         }
 550
 551                 /* check hardware address */
 552                 result=OK;
 553                 if(verbose)
 554                         printf("DHCPOFFER chaddr: ");
 555
 556                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 557                         if(verbose)
 558                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 559
 560                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 561                                 result=ERROR;
 562                         }
 563                 if(verbose)
 564                         printf("\n");
 565
 566                 if(result==ERROR){
 567                         if(verbose)
 568                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 569
 570                         continue;
 571                         }
 572
 573                 if(verbose){
 574                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 575                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 576                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 577                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 578                         }
 579
 580                 add_dhcp_offer(source.sin_addr,&offer_packet);
 581
 582                 valid_responses++;
 583                 }
 584
 585         if(verbose){
 586                 printf(_("Total responses seen on the wire: %d\n"),responses);
 587                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 588                 }
 589
 590         return OK;
 591         }
 592
 593
 594
 595 /* sends a DHCP packet */
 596 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 597         int result;
 598
 599         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 600
 601         if(verbose)
 602                 printf(_("send_dhcp_packet result: %d\n"),result);
 603
 604         if(result<0)
 605                 return ERROR;
 606
 607         return OK;
 608         }
 609
 610
 611
 612 /* receives a DHCP packet */
 613 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 614         struct timeval tv;
 615         fd_set readfds;
 616         int recv_result;
 617         socklen_t address_size;
 618         struct sockaddr_in source_address;
 619
 620
 621         /* wait for data to arrive (up time timeout) */
 622         tv.tv_sec=timeout;
 623         tv.tv_usec=0;
 624         FD_ZERO(&readfds);
 625         FD_SET(sock,&readfds);
 626         select(sock+1,&readfds,NULL,NULL,&tv);
 627
 628         /* make sure some data has arrived */
 629         if(!FD_ISSET(sock,&readfds)){
 630                 if(verbose)
 631                         printf(_("No (more) data received\n"));
 632                 return ERROR;
 633                 }
 634
 635         else{
 636
 637                 /* 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
 638                    not being interpreted correctly.  sigh... */
 639                 bzero(&source_address,sizeof(source_address));
 640                 address_size=sizeof(source_address);
 641                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 642                 if(verbose)
 643                         printf("recv_result_1: %d\n",recv_result);
 644                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 645                 if(verbose)
 646                         printf("recv_result_2: %d\n",recv_result);
 647
 648                 if(recv_result==-1){
 649                         if(verbose){
 650                                 printf(_("recvfrom() failed, "));
 651                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 652                                 }
 653                         return ERROR;
 654                         }
 655                 else{
 656                         if(verbose){
 657                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 658                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 659                                 }
 660
 661                         memcpy(address,&source_address,sizeof(source_address));
 662                         return OK;
 663                         }
 664                 }
 665
 666         return OK;
 667         }
 668
 669
 670 /* creates a socket for DHCP communication */
 671 int create_dhcp_socket(void){
 672         struct sockaddr_in myname;
 673         struct ifreq interface;
 674         int sock;
 675         int flag=1;
 676
 677         /* Set up the address we're going to bind to. */
 678         bzero(&myname,sizeof(myname));
 679         myname.sin_family=AF_INET;
 680         myname.sin_port=htons(DHCP_CLIENT_PORT);
 681         myname.sin_addr.s_addr=INADDR_ANY;                 /* listen on any address */
 682         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 683
 684         /* create a socket for DHCP communications */
 685         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 686         if(sock<0){
 687                 printf(_("Error: Could not create socket!\n"));
 688                 exit(STATE_UNKNOWN);
 689                 }
 690
 691         if(verbose)
 692                 printf("DHCP socket: %d\n",sock);
 693
 694         /* set the reuse address flag so we don't get errors when restarting */
 695         flag=1;
 696         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 697                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 698                 exit(STATE_UNKNOWN);
 699                 }
 700
 701         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 702         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 703                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 704                 exit(STATE_UNKNOWN);
 705                 }
 706
 707         /* bind socket to interface */
 708 #if defined(__linux__)
 709         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
 710         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 711                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 712                 exit(STATE_UNKNOWN);
 713                 }
 714
 715 #else
 716         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
 717 #endif
 718
 719         /* bind the socket */
 720         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 721                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 722                 exit(STATE_UNKNOWN);
 723                 }
 724
 725         return sock;
 726         }
 727
 728
 729 /* closes DHCP socket */
 730 int close_dhcp_socket(int sock){
 731
 732         close(sock);
 733
 734         return OK;
 735         }
 736
 737
 738 /* adds a requested server address to list in memory */
 739 int add_requested_server(struct in_addr server_address){
 740         requested_server *new_server;
 741
 742         new_server=(requested_server *)malloc(sizeof(requested_server));
 743         if(new_server==NULL)
 744                 return ERROR;
 745
 746         new_server->server_address=server_address;
 747         new_server->answered=FALSE;
 748
 749         new_server->next=requested_server_list;
 750         requested_server_list=new_server;
 751
 752         requested_servers++;
 753
 754         if(verbose)
 755                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 756
 757         return OK;
 758         }
 759
 760
 761
 762
 763 /* adds a DHCP OFFER to list in memory */
 764 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 765         dhcp_offer *new_offer;
 766         int x;
 767         unsigned option_type;
 768         unsigned option_length;
 769         struct in_addr serv_ident = {0};
 770
 771         if(offer_packet==NULL)
 772                 return ERROR;
 773
 774         /* process all DHCP options present in the packet */
 775         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 776
 777                 /* end of options (0 is really just a pad, but bail out anyway) */
 778                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 779                         break;
 780
 781                 /* get option type */
 782                 option_type=offer_packet->options[x++];
 783
 784                 /* get option length */
 785                 option_length=offer_packet->options[x++];
 786
 787                 if(verbose)
 788                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 789
 790                 /* get option data */
 791                 switch(option_type){
 792                 case DHCP_OPTION_LEASE_TIME:
 793                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 794                         dhcp_lease_time = ntohl(dhcp_lease_time);
 795                         break;
 796                 case DHCP_OPTION_RENEWAL_TIME:
 797                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 798                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 799                         break;
 800                 case DHCP_OPTION_REBINDING_TIME:
 801                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 802                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 803                         break;
 804                 case DHCP_OPTION_SERVER_IDENTIFIER:
 805                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 806                         break;
 807                         }
 808
 809                 /* skip option data we're ignoring */
 810                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 811                         x+=option_length;
 812                 }
 813
 814         if(verbose){
 815                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 816                         printf(_("Lease Time: Infinite\n"));
 817                 else
 818                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 819                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 820                         printf(_("Renewal Time: Infinite\n"));
 821                 else
 822                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 823                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 824                         printf(_("Rebinding Time: Infinite\n"));
 825                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 826                 }
 827
 828         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 829
 830         if(new_offer==NULL)
 831                 return ERROR;
 832
 833         /*
 834          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 835          * 'siaddr' field as the address of the server to use in the next step
 836          * of the client's bootstrap process.  A DHCP server may return its own
 837          * address in the 'siaddr' field, if the server is prepared to supply
 838          * the next bootstrap service (e.g., delivery of an operating system
 839          * executable image).  A DHCP server always returns its own address in
 840          * the 'server identifier' option."  'serv_ident' is the 'server
 841          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 842          * wasn't available) the IP address we received the DHCPOFFER from.  If
 843          * 'serv_ident' isn't available for some reason, we use 'source'.
 844          */
 845         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 846         new_offer->offered_address=offer_packet->yiaddr;
 847         new_offer->lease_time=dhcp_lease_time;
 848         new_offer->renewal_time=dhcp_renewal_time;
 849         new_offer->rebinding_time=dhcp_rebinding_time;
 850
 851
 852         if(verbose){
 853                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 854                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 855                 }
 856
 857         /* add new offer to head of list */
 858         new_offer->next=dhcp_offer_list;
 859         dhcp_offer_list=new_offer;
 860
 861         return OK;
 862         }
 863
 864
 865 /* frees memory allocated to DHCP OFFER list */
 866 int free_dhcp_offer_list(void){
 867         dhcp_offer *this_offer;
 868         dhcp_offer *next_offer;
 869
 870         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 871                 next_offer=this_offer->next;
 872                 free(this_offer);
 873                 }
 874
 875         return OK;
 876         }
 877
 878
 879 /* frees memory allocated to requested server list */
 880 int free_requested_server_list(void){
 881         requested_server *this_server;
 882         requested_server *next_server;
 883
 884         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 885                 next_server=this_server->next;
 886                 free(this_server);
 887                 }
 888
 889         return OK;
 890         }
 891
 892
 893 /* gets state and plugin output to return */
 894 int get_results(void){
 895         dhcp_offer *temp_offer;
 896         requested_server *temp_server;
 897         int result;
 898         u_int32_t max_lease_time=0;
 899
 900         received_requested_address=FALSE;
 901
 902         /* checks responses from requested servers */
 903         requested_responses=0;
 904         if(requested_servers>0){
 905
 906                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 907
 908                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 909
 910                                 /* get max lease time we were offered */
 911                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 912                                         max_lease_time=temp_offer->lease_time;
 913
 914                                 /* see if we got the address we requested */
 915                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 916                                         received_requested_address=TRUE;
 917
 918                                 /* see if the servers we wanted a response from talked to us or not */
 919                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 920                                         if(verbose){
 921                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 922                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 923                                                 if(temp_server->answered)
 924                                                         printf(_(" (duplicate)"));
 925                                                 printf(_("\n"));
 926                                                 }
 927                                         if(temp_server->answered == FALSE){
 928                                                 requested_responses++;
 929                                                 temp_server->answered=TRUE;
 930                                                 }
 931                                         }
 932                                 }
 933                         }
 934
 935                 }
 936
 937         /* else check and see if we got our requested address from any server */
 938         else{
 939
 940                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 941
 942                         /* get max lease time we were offered */
 943                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 944                                 max_lease_time=temp_offer->lease_time;
 945
 946                         /* see if we got the address we requested */
 947                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 948                                 received_requested_address=TRUE;
 949                         }
 950                 }
 951
 952         result=STATE_OK;
 953         if(valid_responses==0)
 954                 result=STATE_CRITICAL;
 955         else if(requested_servers>0 && requested_responses==0)
 956                 result=STATE_CRITICAL;
 957         else if(requested_responses<requested_servers)
 958                 result=STATE_WARNING;
 959         else if(request_specific_address==TRUE && received_requested_address==FALSE)
 960                 result=STATE_WARNING;
 961
 962         if(result==0)               /* garrett honeycutt 2005 */
 963                 printf("OK: ");
 964         else if(result==1)
 965                 printf("WARNING: ");
 966         else if(result==2)
 967                 printf("CRITICAL: ");
 968         else if(result==3)
 969                 printf("UNKNOWN: ");
 970
 971         /* we didn't receive any DHCPOFFERs */
 972         if(dhcp_offer_list==NULL){
 973                 printf(_("No DHCPOFFERs were received.\n"));
 974                 return result;
 975                 }
 976
 977         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
 978
 979         if(requested_servers>0)
 980                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
 981
 982         if(request_specific_address==TRUE)
 983                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
 984
 985         printf(_(", max lease time = "));
 986         if(max_lease_time==DHCP_INFINITE_TIME)
 987                 printf(_("Infinity"));
 988         else
 989                 printf("%lu sec",(unsigned long)max_lease_time);
 990
 991         printf(".\n");
 992
 993         return result;
 994         }
 995
 996
 997 /* process command-line arguments */
 998 int process_arguments(int argc, char **argv){
 999         int c;
1000
1001         if(argc<1)
1002                 return ERROR;
1003
1004         c=0;
1005         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1006
1007                 /*
1008                 if(is_option(argv[c]))
1009                         continue;
1010                 */
1011                 }
1012
1013         return validate_arguments();
1014         }
1015
1016
1017
1018 int call_getopt(int argc, char **argv){
1019         int c=0;
1020         int i=0;
1021         struct in_addr ipaddress;
1022
1023         int option_index = 0;
1024         static struct option long_options[] =
1025         {
1026                 {"serverip",       required_argument,0,'s'},
1027                 {"requestedip",    required_argument,0,'r'},
1028                 {"timeout",        required_argument,0,'t'},
1029                 {"interface",      required_argument,0,'i'},
1030                 {"verbose",        no_argument,      0,'v'},
1031                 {"version",        no_argument,      0,'V'},
1032                 {"help",           no_argument,      0,'h'},
1033                 {0,0,0,0}
1034         };
1035
1036         while(1){
1037                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1038
1039                 i++;
1040
1041                 if(c==-1||c==EOF||c==1)
1042                         break;
1043
1044                 switch(c){
1045                 case 'w':
1046                 case 'r':
1047                 case 't':
1048                 case 'i':
1049                         i++;
1050                         break;
1051                 default:
1052                         break;
1053                         }
1054
1055                 switch(c){
1056
1057                 case 's': /* DHCP server address */
1058                         if(inet_aton(optarg,&ipaddress))
1059                                 add_requested_server(ipaddress);
1060                         /*
1061                         else
1062                                 usage("Invalid server IP address\n");
1063                         */
1064                         break;
1065
1066                 case 'r': /* address we are requested from DHCP servers */
1067                         if(inet_aton(optarg,&ipaddress)){
1068                                 requested_address=ipaddress;
1069                                 request_specific_address=TRUE;
1070                                 }
1071                         /*
1072                         else
1073                                 usage("Invalid requested IP address\n");
1074                         */
1075                         break;
1076
1077                 case 't': /* timeout */
1078
1079                         /*
1080                         if(is_intnonneg(optarg))
1081                         */
1082                         if(atoi(optarg)>0)
1083                                 dhcpoffer_timeout=atoi(optarg);
1084                         /*
1085                         else
1086                                 usage("Time interval must be a nonnegative integer\n");
1087                         */
1088                         break;
1089
1090                 case 'i': /* interface name */
1091
1092                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1093                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1094
1095                         break;
1096
1097                 case 'V': /* version */
1098                         print_revision(progname,revision);
1099                         exit(STATE_OK);
1100
1101                 case 'h': /* help */
1102                         print_help();
1103                         exit(STATE_OK);
1104
1105                 case 'v': /* verbose */
1106                         verbose=1;
1107                         break;
1108
1109                 case '?': /* help */
1110                         usage5 ();
1111                         break;
1112
1113                 default:
1114                         break;
1115                         }
1116                 }
1117
1118         return i;
1119         }
1120
1121
1122 int validate_arguments(void){
1123
1124         return OK;
1125         }
1126
1127
1128 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1129 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1130
1131 /* get a message from a stream; return type of message */
1132 static int get_msg(int fd){
1133         int flags = 0;
1134         int res, ret;
1135         ctl_area[0] = 0;
1136         dat_area[0] = 0;
1137         ret = 0;
1138         res = getmsg(fd, &ctl, &dat, &flags);
1139
1140         if(res < 0){
1141                 if(errno == EINTR){
1142                         return(GOT_INTR);
1143                         }
1144                 else{
1145                         printf("%s\n", "get_msg FAILED.");
1146                         return(GOT_ERR);
1147                         }
1148                 }
1149         if(ctl.len > 0){
1150                 ret |= GOT_CTRL;
1151                 }
1152         if(dat.len > 0){
1153                 ret |= GOT_DATA;
1154                 }
1155
1156         return(ret);
1157         }
1158
1159 /* verify that dl_primitive in ctl_area = prim */
1160 static int check_ctrl(int prim){
1161         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1162
1163         if(err_ack->dl_primitive != prim){
1164                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1165                 exit(STATE_UNKNOWN);
1166                 }
1167
1168         return 0;
1169         }
1170
1171 /* put a control message on a stream */
1172 static int put_ctrl(int fd, int len, int pri){
1173
1174         ctl.len = len;
1175         if(putmsg(fd, &ctl, 0, pri) < 0){
1176                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1177                 exit(STATE_UNKNOWN);
1178                 }
1179
1180         return  0;
1181         }
1182
1183 /* put a control + data message on a stream */
1184 static int put_both(int fd, int clen, int dlen, int pri){
1185
1186         ctl.len = clen;
1187         dat.len = dlen;
1188         if(putmsg(fd, &ctl, &dat, pri) < 0){
1189                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1190                 exit(STATE_UNKNOWN);
1191                 }
1192
1193         return  0;
1194         }
1195
1196 /* open file descriptor and attach */
1197 static int dl_open(const char *dev, int unit, int *fd){
1198         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1199
1200         if((*fd = open(dev, O_RDWR)) == -1){
1201                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1202                 exit(STATE_UNKNOWN);
1203                 }
1204         attach_req->dl_primitive = DL_ATTACH_REQ;
1205         attach_req->dl_ppa = unit;
1206         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1207         get_msg(*fd);
1208         return check_ctrl(DL_OK_ACK);
1209         }
1210
1211 /* send DL_BIND_REQ */
1212 static int dl_bind(int fd, int sap, u_char *addr){
1213         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1214         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1215
1216         bind_req->dl_primitive = DL_BIND_REQ;
1217         bind_req->dl_sap = sap;
1218         bind_req->dl_max_conind = 1;
1219         bind_req->dl_service_mode = DL_CLDLS;
1220         bind_req->dl_conn_mgmt = 0;
1221         bind_req->dl_xidtest_flg = 0;
1222         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1223         get_msg(fd);
1224         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1225                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1226                 exit(STATE_UNKNOWN);
1227                 }
1228         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1229               bind_ack->dl_addr_length);
1230
1231         return 0;
1232         }
1233
1234 /***********************************************************************
1235  * interface:
1236  * function mac_addr_dlpi - get the mac address of the interface with
1237  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1238  *
1239  * parameter: addr: an array of six bytes, has to be allocated by the caller
1240  *
1241  * return: 0 if OK, -1 if the address could not be determined
1242  *
1243  *
1244  ***********************************************************************/
1245
1246 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1247         int fd;
1248         u_char mac_addr[25];
1249
1250         if(GOT_ERR != dl_open(dev, unit, &fd)){
1251                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1252                         bcopy( mac_addr, addr, 6);
1253                         return 0;
1254                         }
1255                 }
1256         close(fd);
1257
1258         return -1;
1259         }
1260
1261 /* Kompf 2000-2003 */
1262 #endif
1263
1264
1265 /* print usage help */
1266 void print_help(void){
1267
1268         print_revision(progname,revision);
1269
1270         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1271         printf (COPYRIGHT, copyright, email);
1272
1273         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1274
1275   printf ("\n\n");
1276
1277         print_usage();
1278
1279         printf (_(UT_HELP_VRSN));
1280
1281         printf (_(UT_VERBOSE));
1282
1283         printf (" %s\n", "-s, --serverip=IPADDRESS");
1284   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1285   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1286   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1287   printf (" %s\n", "-t, --timeout=INTEGER");
1288   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1289   printf (" %s\n", "-i, --interface=STRING");
1290   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1291
1292         return;
1293         }
1294
1295
1296 void
1297 print_usage(void){
1298
1299   printf (_("Usage:"));
1300   printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1301
1302         return;
1303         }
1304
1305
1306