plugins-root/check_dhcp.c

   1 /*****************************************************************************
   2 *
   3 * Monitoring check_dhcp plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
   7 * Copyright (c) 2001-2007 Monitoring Plugins Development Team
   8 *
   9 * Description:
  10 *
  11 * This file contains the check_dhcp plugin
  12 *
  13 * This plugin tests the availability of DHCP servers on a network.
  14 *
  15 * Unicast mode was originally implemented by Heiti of Boras Kommun with
  16 * general improvements as well as usability fixes and "forward"-porting by
  17 * Andreas Ericsson of OP5 AB.
  18 *
  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 3 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, see <http://www.gnu.org/licenses/>.
  32 *
  33 *
  34 *****************************************************************************/
  35
  36 const char *progname = "check_dhcp";
  37 const char *copyright = "2001-2007";
  38 const char *email = "devel@monitoring-plugins.org";
  39
  40 #include "common.h"
  41 #include "netutils.h"
  42 #include "utils.h"
  43
  44 #include <ctype.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <errno.h>
  49 #include <unistd.h>
  50 #include <sys/time.h>
  51 #include <sys/ioctl.h>
  52 #include <fcntl.h>
  53 #include <getopt.h>
  54 #include <sys/socket.h>
  55 #include <sys/types.h>
  56 #include <netdb.h>
  57 #include <netinet/in.h>
  58 #include <net/if.h>
  59 #include <arpa/inet.h>
  60 #if HAVE_SYS_SOCKIO_H
  61 #include <sys/sockio.h>
  62 #endif
  63
  64 #if defined( __linux__ )
  65
  66 #include <linux/if_ether.h>
  67 #include <features.h>
  68
  69 #elif defined (__bsd__)
  70
  71 #include <netinet/if_ether.h>
  72 #include <sys/param.h>
  73 #include <sys/sysctl.h>
  74 #include <net/if_dl.h>
  75
  76 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
  77
  78 #define INSAP 22
  79 #define OUTSAP 24
  80
  81 #include <signal.h>
  82 #include <ctype.h>
  83 #include <sys/stropts.h>
  84 #include <sys/poll.h>
  85 #include <sys/dlpi.h>
  86
  87 #define bcopy(source, destination, length) memcpy(destination, source, length)
  88
  89 #define AREA_SZ 5000            /* buffer length in bytes */
  90 static u_long ctl_area[AREA_SZ];
  91 static u_long dat_area[AREA_SZ];
  92 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
  93 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
  94
  95 #define GOT_CTRL 1
  96 #define GOT_DATA 2
  97 #define GOT_BOTH 3
  98 #define GOT_INTR 4
  99 #define GOT_ERR 128
 100
 101 #define u_int8_t         uint8_t
 102 #define u_int16_t       uint16_t
 103 #define u_int32_t       uint32_t
 104
 105 static int get_msg(int);
 106 static int check_ctrl(int);
 107 static int put_ctrl(int, int, int);
 108 static int put_both(int, int, int, int);
 109 static int dl_open(const char *, int, int *);
 110 static int dl_bind(int, int, u_char *);
 111 long mac_addr_dlpi( const char *, int, u_char *);
 112
 113 #endif
 114
 115
 116
 117 /**** Common definitions ****/
 118
 119 #define OK                0
 120 #define ERROR             -1
 121
 122 #define FALSE             0
 123 #define TRUE              1
 124
 125
 126 /**** DHCP definitions ****/
 127
 128 #define MAX_DHCP_CHADDR_LENGTH           16
 129 #define MAX_DHCP_SNAME_LENGTH            64
 130 #define MAX_DHCP_FILE_LENGTH             128
 131 #define MAX_DHCP_OPTIONS_LENGTH          312
 132
 133
 134 typedef struct dhcp_packet_struct{
 135         u_int8_t  op;                   /* packet type */
 136         u_int8_t  htype;                /* type of hardware address for this machine (Ethernet, etc) */
 137         u_int8_t  hlen;                 /* length of hardware address (of this machine) */
 138         u_int8_t  hops;                 /* hops */
 139         u_int32_t xid;                  /* random transaction id number - chosen by this machine */
 140         u_int16_t secs;                 /* seconds used in timing */
 141         u_int16_t flags;                /* flags */
 142         struct in_addr ciaddr;          /* IP address of this machine (if we already have one) */
 143         struct in_addr yiaddr;          /* IP address of this machine (offered by the DHCP server) */
 144         struct in_addr siaddr;          /* IP address of next server */
 145         struct in_addr giaddr;          /* IP address of DHCP relay */
 146         unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH];      /* hardware address of this machine */
 147         char sname [MAX_DHCP_SNAME_LENGTH];    /* name of DHCP server */
 148         char file [MAX_DHCP_FILE_LENGTH];      /* boot file name (used for diskless booting?) */
 149         char options[MAX_DHCP_OPTIONS_LENGTH];  /* options */
 150         }dhcp_packet;
 151
 152
 153 typedef struct dhcp_offer_struct{
 154         struct in_addr server_address;   /* address of DHCP server that sent this offer */
 155         struct in_addr offered_address;  /* the IP address that was offered to us */
 156         u_int32_t lease_time;            /* lease time in seconds */
 157         u_int32_t renewal_time;          /* renewal time in seconds */
 158         u_int32_t rebinding_time;        /* rebinding time in seconds */
 159         struct dhcp_offer_struct *next;
 160         }dhcp_offer;
 161
 162
 163 typedef struct requested_server_struct{
 164         struct in_addr server_address;
 165         int answered;
 166         struct requested_server_struct *next;
 167         }requested_server;
 168
 169
 170 #define BOOTREQUEST     1
 171 #define BOOTREPLY       2
 172
 173 #define DHCPDISCOVER    1
 174 #define DHCPOFFER       2
 175 #define DHCPREQUEST     3
 176 #define DHCPDECLINE     4
 177 #define DHCPACK         5
 178 #define DHCPNACK        6
 179 #define DHCPRELEASE     7
 180
 181 #define DHCP_OPTION_MESSAGE_TYPE        53
 182 #define DHCP_OPTION_HOST_NAME           12
 183 #define DHCP_OPTION_BROADCAST_ADDRESS   28
 184 #define DHCP_OPTION_REQUESTED_ADDRESS   50
 185 #define DHCP_OPTION_LEASE_TIME          51
 186 #define DHCP_OPTION_SERVER_IDENTIFIER   54
 187 #define DHCP_OPTION_RENEWAL_TIME        58
 188 #define DHCP_OPTION_REBINDING_TIME      59
 189 #define DHCP_OPTION_END                 255
 190
 191 #define DHCP_INFINITE_TIME              0xFFFFFFFF
 192
 193 #define DHCP_BROADCAST_FLAG 32768
 194
 195 #define DHCP_SERVER_PORT   67
 196 #define DHCP_CLIENT_PORT   68
 197
 198 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 199 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 200
 201 u_int8_t unicast = 0;        /* unicast mode: mimic a DHCP relay */
 202 struct in_addr my_ip;        /* our address (required for relay) */
 203 struct in_addr dhcp_ip;      /* server to query (if in unicast mode) */
 204 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 205 unsigned char *user_specified_mac=NULL;
 206
 207 char network_interface_name[IFNAMSIZ]="eth0";
 208
 209 u_int32_t packet_xid=0;
 210
 211 u_int32_t dhcp_lease_time=0;
 212 u_int32_t dhcp_renewal_time=0;
 213 u_int32_t dhcp_rebinding_time=0;
 214
 215 int dhcpoffer_timeout=2;
 216
 217 dhcp_offer *dhcp_offer_list=NULL;
 218 requested_server *requested_server_list=NULL;
 219
 220 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 221 int requested_servers=0;
 222 int requested_responses=0;
 223
 224 int request_specific_address=FALSE;
 225 int received_requested_address=FALSE;
 226 int verbose=0;
 227 struct in_addr requested_address;
 228
 229
 230 int process_arguments(int, char **);
 231 int call_getopt(int, char **);
 232 int validate_arguments(int, int);
 233 void print_usage(void);
 234 void print_help(void);
 235
 236 void resolve_host(const char *in,struct in_addr *out);
 237 unsigned char *mac_aton(const char *);
 238 void print_hardware_address(const unsigned char *);
 239 int get_hardware_address(int,char *);
 240 int get_ip_address(int,char *);
 241
 242 int send_dhcp_discover(int);
 243 int get_dhcp_offer(int);
 244
 245 int get_results(void);
 246
 247 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 248 int free_dhcp_offer_list(void);
 249 int free_requested_server_list(void);
 250
 251 int create_dhcp_socket(void);
 252 int close_dhcp_socket(int);
 253 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 254 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 255
 256
 257
 258 int main(int argc, char **argv){
 259         int dhcp_socket;
 260         int result = STATE_UNKNOWN;
 261
 262         setlocale (LC_ALL, "");
 263         bindtextdomain (PACKAGE, LOCALEDIR);
 264         textdomain (PACKAGE);
 265
 266         /* Parse extra opts if any */
 267         argv=np_extra_opts(&argc, argv, progname);
 268
 269         if(process_arguments(argc,argv)!=OK){
 270                 usage4 (_("Could not parse arguments"));
 271                 }
 272
 273         /* create socket for DHCP communications */
 274         dhcp_socket=create_dhcp_socket();
 275
 276         /* get hardware address of client machine */
 277         if(user_specified_mac!=NULL)
 278                 memcpy(client_hardware_address,user_specified_mac,6);
 279         else
 280                 get_hardware_address(dhcp_socket,network_interface_name);
 281
 282         if(unicast) /* get IP address of client machine */
 283                 get_ip_address(dhcp_socket,network_interface_name);
 284
 285         /* send DHCPDISCOVER packet */
 286         send_dhcp_discover(dhcp_socket);
 287
 288         /* wait for a DHCPOFFER packet */
 289         get_dhcp_offer(dhcp_socket);
 290
 291         /* close socket we created */
 292         close_dhcp_socket(dhcp_socket);
 293
 294         /* determine state/plugin output to return */
 295         result=get_results();
 296
 297         /* free allocated memory */
 298         free_dhcp_offer_list();
 299         free_requested_server_list();
 300
 301         return result;
 302         }
 303
 304
 305
 306 /* determines hardware address on client machine */
 307 int get_hardware_address(int sock,char *interface_name){
 308
 309 #if defined(__linux__)
 310         struct ifreq ifr;
 311
 312         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 313         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 314
 315         /* try and grab hardware address of requested interface */
 316         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 317                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 318                 exit(STATE_UNKNOWN);
 319                 }
 320
 321         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 322
 323 #elif defined(__bsd__)
 324                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 325
 326         int                     mib[6], len;
 327         char                    *buf;
 328         unsigned char           *ptr;
 329         struct if_msghdr        *ifm;
 330         struct sockaddr_dl      *sdl;
 331
 332         mib[0] = CTL_NET;
 333         mib[1] = AF_ROUTE;
 334         mib[2] = 0;
 335         mib[3] = AF_LINK;
 336         mib[4] = NET_RT_IFLIST;
 337
 338         if((mib[5] = if_nametoindex(interface_name)) == 0){
 339                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 340                 exit(STATE_UNKNOWN);
 341                 }
 342
 343         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 344                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 345                 exit(STATE_UNKNOWN);
 346                 }
 347
 348         if((buf = malloc(len)) == NULL){
 349                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 350                 exit(4);
 351                 }
 352
 353         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 354                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 355                 exit(STATE_UNKNOWN);
 356                 }
 357
 358         ifm = (struct if_msghdr *)buf;
 359         sdl = (struct sockaddr_dl *)(ifm + 1);
 360         ptr = (unsigned char *)LLADDR(sdl);
 361         memcpy(&client_hardware_address[0], ptr, 6) ;
 362                                                 /* King 2004 */
 363
 364 #elif defined(__sun__) || defined(__solaris__)
 365
 366                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 367         long stat;
 368         char dev[20] = "/dev/";
 369         char *p;
 370         int unit;
 371
 372     /* get last number from interfacename, eg lnc0, e1000g0*/
 373     int i;
 374     p = interface_name + strlen(interface_name) -1;
 375         for(i = strlen(interface_name) -1; i > 0; p--) {
 376                 if(isalpha(*p))
 377             break;
 378     }
 379     p++;
 380         if( p != interface_name ){
 381                 unit = atoi(p) ;
 382                 strncat(dev, interface_name, 6) ;
 383                 }
 384         else{
 385                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 386                 exit(STATE_UNKNOWN);
 387                 }
 388         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 389         if(stat != 0){
 390                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 391                 exit(STATE_UNKNOWN);
 392                 }
 393
 394 #elif defined(__hpux__)
 395
 396         long stat;
 397         char dev[20] = "/dev/dlpi" ;
 398         int unit = 0;
 399
 400         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 401         if(stat != 0){
 402                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 403                 exit(STATE_UNKNOWN);
 404                 }
 405                                                 /* Kompf 2000-2003 */
 406
 407 #else
 408         printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
 409         exit(STATE_UNKNOWN);
 410 #endif
 411
 412         if(verbose)
 413                 print_hardware_address(client_hardware_address);
 414
 415         return OK;
 416         }
 417
 418 /* determines IP address of the client interface */
 419 int get_ip_address(int sock,char *interface_name){
 420 #if defined(SIOCGIFADDR)
 421         struct ifreq ifr;
 422
 423         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 424         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 425
 426         if(ioctl(sock,SIOCGIFADDR,&ifr)<0){
 427                 printf(_("Error: Cannot determine IP address of interface %s\n"),
 428                         interface_name);
 429                 exit(STATE_UNKNOWN);
 430                 }
 431
 432         my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
 433
 434 #else
 435         printf(_("Error: Cannot get interface IP address on this platform.\n"));
 436         exit(STATE_UNKNOWN);
 437 #endif
 438
 439         if(verbose)
 440                 printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip));
 441
 442         return OK;
 443         }
 444
 445 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 446 int send_dhcp_discover(int sock){
 447         dhcp_packet discover_packet;
 448         struct sockaddr_in sockaddr_broadcast;
 449     unsigned short opts;
 450
 451
 452         /* clear the packet data structure */
 453         bzero(&discover_packet,sizeof(discover_packet));
 454
 455
 456         /* boot request flag (backward compatible with BOOTP servers) */
 457         discover_packet.op=BOOTREQUEST;
 458
 459         /* hardware address type */
 460         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 461
 462         /* length of our hardware address */
 463         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 464
 465         /*
 466          * transaction ID is supposed to be random.
 467          */
 468         srand(time(NULL)^getpid());
 469         packet_xid=random();
 470         discover_packet.xid=htonl(packet_xid);
 471
 472         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 473         /* downright bizzarre... */
 474         ntohl(discover_packet.xid);
 475
 476         /*discover_packet.secs=htons(65535);*/
 477         discover_packet.secs=0xFF;
 478
 479         /*
 480          * server needs to know if it should broadcast or unicast its response:
 481          * 0x8000L == 32768 == 1 << 15 == broadcast, 0 == unicast
 482          */
 483         discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG);
 484
 485         /* our hardware address */
 486         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 487
 488         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 489         discover_packet.options[0]='\x63';
 490         discover_packet.options[1]='\x82';
 491         discover_packet.options[2]='\x53';
 492         discover_packet.options[3]='\x63';
 493
 494     opts = 4;
 495         /* DHCP message type is embedded in options field */
 496         discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 497         discover_packet.options[opts++]='\x01';               /* DHCP message option length in bytes */
 498         discover_packet.options[opts++]=DHCPDISCOVER;
 499
 500         /* the IP address we're requesting */
 501         if(request_specific_address==TRUE){
 502                 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
 503                 discover_packet.options[opts++]='\x04';
 504                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
 505                 opts += sizeof(requested_address);
 506                 }
 507         discover_packet.options[opts++]=DHCP_OPTION_END;
 508
 509         /* unicast fields */
 510         if(unicast)
 511                 discover_packet.giaddr.s_addr = my_ip.s_addr;
 512
 513         /* see RFC 1542, 4.1.1 */
 514         discover_packet.hops = unicast ? 1 : 0;
 515
 516         /* send the DHCPDISCOVER packet to broadcast address */
 517         sockaddr_broadcast.sin_family=AF_INET;
 518         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 519         sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.s_addr : INADDR_BROADCAST;
 520         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 521
 522
 523         if(verbose){
 524                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 525                 printf("DHCPDISCOVER XID: %u (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 526                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 527                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 528                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 529                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 530                 }
 531
 532         /* send the DHCPDISCOVER packet out */
 533         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 534
 535         if(verbose)
 536                 printf("\n\n");
 537
 538         return OK;
 539         }
 540
 541
 542
 543
 544 /* waits for a DHCPOFFER message from one or more DHCP servers */
 545 int get_dhcp_offer(int sock){
 546         dhcp_packet offer_packet;
 547         struct sockaddr_in source;
 548         struct sockaddr_in via;
 549         int result=OK;
 550         int responses=0;
 551         int x;
 552         time_t start_time;
 553         time_t current_time;
 554
 555         time(&start_time);
 556
 557         /* receive as many responses as we can */
 558         for(responses=0,valid_responses=0;;){
 559
 560                 time(&current_time);
 561                 if((current_time-start_time)>=dhcpoffer_timeout)
 562                         break;
 563
 564                 if(verbose)
 565                         printf("\n\n");
 566
 567                 bzero(&source,sizeof(source));
 568                 bzero(&via,sizeof(via));
 569                 bzero(&offer_packet,sizeof(offer_packet));
 570
 571                 result=OK;
 572                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 573
 574                 if(result!=OK){
 575                         if(verbose)
 576                                 printf(_("Result=ERROR\n"));
 577
 578                         continue;
 579                         }
 580                 else{
 581                         if(verbose)
 582                                 printf(_("Result=OK\n"));
 583
 584                         responses++;
 585                         }
 586
 587                 /* The "source" is either a server or a relay. */
 588                 /* Save a copy of "source" into "via" even if it's via itself */
 589                 memcpy(&via,&source,sizeof(source)) ;
 590
 591                 if(verbose){
 592                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 593                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 594                         printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 595                         }
 596
 597                 /* check packet xid to see if its the same as the one we used in the discover packet */
 598                 if(ntohl(offer_packet.xid)!=packet_xid){
 599                         if(verbose)
 600                                 printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 601
 602                         continue;
 603                         }
 604
 605                 /* check hardware address */
 606                 result=OK;
 607                 if(verbose)
 608                         printf("DHCPOFFER chaddr: ");
 609
 610                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 611                         if(verbose)
 612                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 613
 614                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 615                                 result=ERROR;
 616                         }
 617                 if(verbose)
 618                         printf("\n");
 619
 620                 if(result==ERROR){
 621                         if(verbose)
 622                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 623
 624                         continue;
 625                         }
 626
 627                 if(verbose){
 628                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 629                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 630                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 631                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 632                         }
 633
 634                 add_dhcp_offer(source.sin_addr,&offer_packet);
 635
 636                 valid_responses++;
 637                 }
 638
 639         if(verbose){
 640                 printf(_("Total responses seen on the wire: %d\n"),responses);
 641                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 642                 }
 643
 644         return OK;
 645         }
 646
 647
 648
 649 /* sends a DHCP packet */
 650 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 651         int result;
 652
 653         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 654
 655         if(verbose)
 656                 printf(_("send_dhcp_packet result: %d\n"),result);
 657
 658         if(result<0)
 659                 return ERROR;
 660
 661         return OK;
 662         }
 663
 664
 665
 666 /* receives a DHCP packet */
 667 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 668         struct timeval tv;
 669         fd_set readfds;
 670         fd_set oobfds;
 671         int recv_result;
 672         socklen_t address_size;
 673         struct sockaddr_in source_address;
 674         int nfound;
 675
 676
 677         /* wait for data to arrive (up time timeout) */
 678         tv.tv_sec=timeout;
 679         tv.tv_usec=0;
 680         FD_ZERO(&readfds);
 681         FD_ZERO(&oobfds);
 682         FD_SET(sock,&readfds);
 683         FD_SET(sock,&oobfds);
 684         nfound = select(sock+1,&readfds,NULL,&oobfds,&tv);
 685
 686         /* make sure some data has arrived */
 687         if(!FD_ISSET(sock,&readfds)){
 688                 if(verbose)
 689                         printf(_("No (more) data received (nfound: %d)\n"), nfound);
 690                 return ERROR;
 691                 }
 692
 693         else{
 694                 bzero(&source_address,sizeof(source_address));
 695                 address_size=sizeof(source_address);
 696                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 697                 if(verbose)
 698                         printf("recv_result: %d\n",recv_result);
 699
 700                 if(recv_result==-1){
 701                         if(verbose){
 702                                 printf(_("recvfrom() failed, "));
 703                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 704                                 }
 705                         return ERROR;
 706                         }
 707                 else{
 708                         if(verbose){
 709                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 710                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 711                                 }
 712
 713                         memcpy(address,&source_address,sizeof(source_address));
 714                         return OK;
 715                         }
 716                 }
 717
 718         return OK;
 719         }
 720
 721
 722 /* creates a socket for DHCP communication */
 723 int create_dhcp_socket(void){
 724         struct sockaddr_in myname;
 725         struct ifreq interface;
 726         int sock;
 727         int flag=1;
 728
 729         /* Set up the address we're going to bind to. */
 730         bzero(&myname,sizeof(myname));
 731         myname.sin_family=AF_INET;
 732         /* listen to DHCP server port if we're in unicast mode */
 733         myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT);
 734         myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY;
 735         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 736
 737         /* create a socket for DHCP communications */
 738         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 739         if(sock<0){
 740                 printf(_("Error: Could not create socket!\n"));
 741                 exit(STATE_UNKNOWN);
 742                 }
 743
 744         if(verbose)
 745                 printf("DHCP socket: %d\n",sock);
 746
 747         /* set the reuse address flag so we don't get errors when restarting */
 748         flag=1;
 749         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 750                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 751                 exit(STATE_UNKNOWN);
 752                 }
 753
 754         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 755         if(!unicast && setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 756                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 757                 exit(STATE_UNKNOWN);
 758                 }
 759
 760         /* bind socket to interface */
 761 #if defined(__linux__)
 762         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ-1);
 763         interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
 764         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 765                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 766                 exit(STATE_UNKNOWN);
 767                 }
 768
 769 #else
 770         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ-1);
 771         interface.ifr_name[IFNAMSIZ-1]='\0';
 772 #endif
 773
 774         /* bind the socket */
 775         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 776                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 777                 exit(STATE_UNKNOWN);
 778                 }
 779
 780         return sock;
 781         }
 782
 783
 784 /* closes DHCP socket */
 785 int close_dhcp_socket(int sock){
 786
 787         close(sock);
 788
 789         return OK;
 790         }
 791
 792
 793 /* adds a requested server address to list in memory */
 794 int add_requested_server(struct in_addr server_address){
 795         requested_server *new_server;
 796
 797         new_server=(requested_server *)malloc(sizeof(requested_server));
 798         if(new_server==NULL)
 799                 return ERROR;
 800
 801         new_server->server_address=server_address;
 802         new_server->answered=FALSE;
 803
 804         new_server->next=requested_server_list;
 805         requested_server_list=new_server;
 806
 807         requested_servers++;
 808
 809         if(verbose)
 810                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 811
 812         return OK;
 813         }
 814
 815
 816
 817
 818 /* adds a DHCP OFFER to list in memory */
 819 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 820         dhcp_offer *new_offer;
 821         int x;
 822         unsigned option_type;
 823         unsigned option_length;
 824         struct in_addr serv_ident = {0};
 825
 826         if(offer_packet==NULL)
 827                 return ERROR;
 828
 829         /* process all DHCP options present in the packet */
 830         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH-1;){
 831
 832                 if((int)offer_packet->options[x]==-1)
 833                         break;
 834
 835                 /* get option type */
 836                 option_type=offer_packet->options[x++];
 837
 838                 /* get option length */
 839                 option_length=offer_packet->options[x++];
 840
 841                 if(verbose)
 842                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 843
 844                 /* get option data */
 845                 switch(option_type){
 846                 case DHCP_OPTION_LEASE_TIME:
 847                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 848                         dhcp_lease_time = ntohl(dhcp_lease_time);
 849                         break;
 850                 case DHCP_OPTION_RENEWAL_TIME:
 851                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 852                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 853                         break;
 854                 case DHCP_OPTION_REBINDING_TIME:
 855                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 856                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 857                         break;
 858                 case DHCP_OPTION_SERVER_IDENTIFIER:
 859                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 860                         break;
 861                         }
 862
 863                 /* skip option data we're ignoring */
 864                 if(option_type==0) /* "pad" option, see RFC 2132 (3.1) */
 865                         x+=1;
 866                 else
 867                         x+=option_length;
 868                 }
 869
 870         if(verbose){
 871                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 872                         printf(_("Lease Time: Infinite\n"));
 873                 else
 874                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 875                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 876                         printf(_("Renewal Time: Infinite\n"));
 877                 else
 878                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 879                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 880                         printf(_("Rebinding Time: Infinite\n"));
 881                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 882                 }
 883
 884         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 885
 886         if(new_offer==NULL)
 887                 return ERROR;
 888
 889         /*
 890          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 891          * 'siaddr' field as the address of the server to use in the next step
 892          * of the client's bootstrap process.  A DHCP server may return its own
 893          * address in the 'siaddr' field, if the server is prepared to supply
 894          * the next bootstrap service (e.g., delivery of an operating system
 895          * executable image).  A DHCP server always returns its own address in
 896          * the 'server identifier' option."  'serv_ident' is the 'server
 897          * identifier' option, 'source' is the IP address we received the
 898          * DHCPOFFER from.  If 'serv_ident' isn't available for some reason, we
 899          * use 'source'.
 900          */
 901         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 902         new_offer->offered_address=offer_packet->yiaddr;
 903         new_offer->lease_time=dhcp_lease_time;
 904         new_offer->renewal_time=dhcp_renewal_time;
 905         new_offer->rebinding_time=dhcp_rebinding_time;
 906
 907
 908         if(verbose){
 909                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 910                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 911                 }
 912
 913         /* add new offer to head of list */
 914         new_offer->next=dhcp_offer_list;
 915         dhcp_offer_list=new_offer;
 916
 917         return OK;
 918         }
 919
 920
 921 /* frees memory allocated to DHCP OFFER list */
 922 int free_dhcp_offer_list(void){
 923         dhcp_offer *this_offer;
 924         dhcp_offer *next_offer;
 925
 926         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 927                 next_offer=this_offer->next;
 928                 free(this_offer);
 929                 }
 930
 931         return OK;
 932         }
 933
 934
 935 /* frees memory allocated to requested server list */
 936 int free_requested_server_list(void){
 937         requested_server *this_server;
 938         requested_server *next_server;
 939
 940         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 941                 next_server=this_server->next;
 942                 free(this_server);
 943                 }
 944
 945         return OK;
 946         }
 947
 948
 949 /* gets state and plugin output to return */
 950 int get_results(void){
 951         dhcp_offer *temp_offer;
 952         requested_server *temp_server;
 953         int result;
 954         u_int32_t max_lease_time=0;
 955
 956         received_requested_address=FALSE;
 957
 958         /* checks responses from requested servers */
 959         requested_responses=0;
 960         if(requested_servers>0){
 961
 962                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 963
 964                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 965
 966                                 /* get max lease time we were offered */
 967                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 968                                         max_lease_time=temp_offer->lease_time;
 969
 970                                 /* see if we got the address we requested */
 971                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 972                                         received_requested_address=TRUE;
 973
 974                                 /* see if the servers we wanted a response from talked to us or not */
 975                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 976                                         if(verbose){
 977                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 978                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 979                                                 if(temp_server->answered)
 980                                                         printf(_(" (duplicate)"));
 981                                                 printf(_("\n"));
 982                                                 }
 983                                         if(temp_server->answered == FALSE){
 984                                                 requested_responses++;
 985                                                 temp_server->answered=TRUE;
 986                                                 }
 987                                         }
 988                                 }
 989                         }
 990
 991                 }
 992
 993         /* else check and see if we got our requested address from any server */
 994         else{
 995
 996                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 997
 998                         /* get max lease time we were offered */
 999                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
1000                                 max_lease_time=temp_offer->lease_time;
1001
1002                         /* see if we got the address we requested */
1003                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
1004                                 received_requested_address=TRUE;
1005                         }
1006                 }
1007
1008         result=STATE_OK;
1009         if(valid_responses==0)
1010                 result=STATE_CRITICAL;
1011         else if(requested_servers>0 && requested_responses==0)
1012                 result=STATE_CRITICAL;
1013         else if(requested_responses<requested_servers)
1014                 result=STATE_WARNING;
1015         else if(request_specific_address==TRUE && received_requested_address==FALSE)
1016                 result=STATE_WARNING;
1017
1018         if(result==0)               /* garrett honeycutt 2005 */
1019                 printf("OK: ");
1020         else if(result==1)
1021                 printf("WARNING: ");
1022         else if(result==2)
1023                 printf("CRITICAL: ");
1024         else if(result==3)
1025                 printf("UNKNOWN: ");
1026
1027         /* we didn't receive any DHCPOFFERs */
1028         if(dhcp_offer_list==NULL){
1029                 printf(_("No DHCPOFFERs were received.\n"));
1030                 return result;
1031                 }
1032
1033         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
1034
1035         if(requested_servers>0)
1036                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
1037
1038         if(request_specific_address==TRUE)
1039                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
1040
1041         printf(_(", max lease time = "));
1042         if(max_lease_time==DHCP_INFINITE_TIME)
1043                 printf(_("Infinity"));
1044         else
1045                 printf("%lu sec",(unsigned long)max_lease_time);
1046
1047         printf(".\n");
1048
1049         return result;
1050         }
1051
1052
1053 /* process command-line arguments */
1054 int process_arguments(int argc, char **argv){
1055         int arg_index;
1056
1057         if(argc<1)
1058                 return ERROR;
1059
1060         arg_index = call_getopt(argc,argv);
1061         return validate_arguments(argc,arg_index);
1062         }
1063
1064
1065
1066 int call_getopt(int argc, char **argv){
1067         extern int optind;
1068         int option_index = 0;
1069         static struct option long_options[] =
1070         {
1071                 {"serverip",       required_argument,0,'s'},
1072                 {"requestedip",    required_argument,0,'r'},
1073                 {"timeout",        required_argument,0,'t'},
1074                 {"interface",      required_argument,0,'i'},
1075                 {"mac",            required_argument,0,'m'},
1076                 {"unicast",        no_argument,      0,'u'},
1077                 {"verbose",        no_argument,      0,'v'},
1078                 {"version",        no_argument,      0,'V'},
1079                 {"help",           no_argument,      0,'h'},
1080                 {0,0,0,0}
1081         };
1082
1083         while(1){
1084                 int c=0;
1085
1086                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
1087
1088                 if(c==-1||c==EOF||c==1)
1089                         break;
1090
1091                 switch(c){
1092
1093                 case 's': /* DHCP server address */
1094                         resolve_host(optarg,&dhcp_ip);
1095                         add_requested_server(dhcp_ip);
1096                         break;
1097
1098                 case 'r': /* address we are requested from DHCP servers */
1099                         resolve_host(optarg,&requested_address);
1100                         request_specific_address=TRUE;
1101                         break;
1102
1103                 case 't': /* timeout */
1104
1105                         /*
1106                         if(is_intnonneg(optarg))
1107                         */
1108                         if(atoi(optarg)>0)
1109                                 dhcpoffer_timeout=atoi(optarg);
1110                         /*
1111                         else
1112                                 usage("Time interval must be a nonnegative integer\n");
1113                         */
1114                         break;
1115
1116                 case 'm': /* MAC address */
1117
1118                         if((user_specified_mac=mac_aton(optarg)) == NULL)
1119                                 usage("Cannot parse MAC address.\n");
1120                         if(verbose)
1121                                 print_hardware_address(user_specified_mac);
1122
1123                         break;
1124
1125                 case 'i': /* interface name */
1126
1127                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1128                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1129
1130                         break;
1131
1132                 case 'u': /* unicast testing */
1133                         unicast=1;
1134                         break;
1135
1136                 case 'V': /* version */
1137                         print_revision(progname, NP_VERSION);
1138                         exit(STATE_UNKNOWN);
1139
1140                 case 'h': /* help */
1141                         print_help();
1142                         exit(STATE_UNKNOWN);
1143
1144                 case 'v': /* verbose */
1145                         verbose=1;
1146                         break;
1147
1148                 case '?': /* help */
1149                         usage5 ();
1150                         break;
1151
1152                 default:
1153                         break;
1154                         }
1155                 }
1156         return optind;
1157         }
1158
1159
1160 int validate_arguments(int argc, int arg_index){
1161
1162         if(argc-optind > 0)
1163                 usage(_("Got unexpected non-option argument"));
1164
1165         return OK;
1166         }
1167
1168
1169 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1170 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1171
1172 /* get a message from a stream; return type of message */
1173 static int get_msg(int fd){
1174         int flags = 0;
1175         int res, ret;
1176         ctl_area[0] = 0;
1177         dat_area[0] = 0;
1178         ret = 0;
1179         res = getmsg(fd, &ctl, &dat, &flags);
1180
1181         if(res < 0){
1182                 if(errno == EINTR){
1183                         return(GOT_INTR);
1184                         }
1185                 else{
1186                         printf("%s\n", "get_msg FAILED.");
1187                         return(GOT_ERR);
1188                         }
1189                 }
1190         if(ctl.len > 0){
1191                 ret |= GOT_CTRL;
1192                 }
1193         if(dat.len > 0){
1194                 ret |= GOT_DATA;
1195                 }
1196
1197         return(ret);
1198         }
1199
1200 /* verify that dl_primitive in ctl_area = prim */
1201 static int check_ctrl(int prim){
1202         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1203
1204         if(err_ack->dl_primitive != prim){
1205                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1206                 exit(STATE_UNKNOWN);
1207                 }
1208
1209         return 0;
1210         }
1211
1212 /* put a control message on a stream */
1213 static int put_ctrl(int fd, int len, int pri){
1214
1215         ctl.len = len;
1216         if(putmsg(fd, &ctl, 0, pri) < 0){
1217                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1218                 exit(STATE_UNKNOWN);
1219                 }
1220
1221         return  0;
1222         }
1223
1224 /* put a control + data message on a stream */
1225 static int put_both(int fd, int clen, int dlen, int pri){
1226
1227         ctl.len = clen;
1228         dat.len = dlen;
1229         if(putmsg(fd, &ctl, &dat, pri) < 0){
1230                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1231                 exit(STATE_UNKNOWN);
1232                 }
1233
1234         return  0;
1235         }
1236
1237 /* open file descriptor and attach */
1238 static int dl_open(const char *dev, int unit, int *fd){
1239         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1240
1241         if((*fd = open(dev, O_RDWR)) == -1){
1242                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1243                 exit(STATE_UNKNOWN);
1244                 }
1245         attach_req->dl_primitive = DL_ATTACH_REQ;
1246         attach_req->dl_ppa = unit;
1247         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1248         get_msg(*fd);
1249         return check_ctrl(DL_OK_ACK);
1250         }
1251
1252 /* send DL_BIND_REQ */
1253 static int dl_bind(int fd, int sap, u_char *addr){
1254         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1255         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1256
1257         bind_req->dl_primitive = DL_BIND_REQ;
1258         bind_req->dl_sap = sap;
1259         bind_req->dl_max_conind = 1;
1260         bind_req->dl_service_mode = DL_CLDLS;
1261         bind_req->dl_conn_mgmt = 0;
1262         bind_req->dl_xidtest_flg = 0;
1263         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1264         get_msg(fd);
1265         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1266                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1267                 exit(STATE_UNKNOWN);
1268                 }
1269         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1270               bind_ack->dl_addr_length);
1271
1272         return 0;
1273         }
1274
1275 /***********************************************************************
1276  * interface:
1277  * function mac_addr_dlpi - get the mac address of the interface with
1278  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1279  *
1280  * parameter: addr: an array of six bytes, has to be allocated by the caller
1281  *
1282  * return: 0 if OK, -1 if the address could not be determined
1283  *
1284  *
1285  ***********************************************************************/
1286
1287 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1288         int fd;
1289         u_char mac_addr[25];
1290
1291         if(GOT_ERR != dl_open(dev, unit, &fd)){
1292                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1293                         bcopy( mac_addr, addr, 6);
1294                         return 0;
1295                         }
1296                 }
1297         close(fd);
1298
1299         return -1;
1300         }
1301
1302 /* Kompf 2000-2003 */
1303 #endif
1304
1305
1306 /* resolve host name or die (TODO: move this to netutils.c!) */
1307 void resolve_host(const char *in,struct in_addr *out){
1308         struct addrinfo hints, *ai;
1309
1310         memset(&hints,0,sizeof(hints));
1311         hints.ai_family=PF_INET;
1312         if (getaddrinfo(in,NULL,&hints,&ai) != 0)
1313                 usage_va(_("Invalid hostname/address - %s"),optarg);
1314
1315         memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out));
1316         freeaddrinfo(ai);
1317         }
1318
1319
1320 /* parse MAC address string, return 6 bytes (unterminated) or NULL */
1321 unsigned char *mac_aton(const char *string){
1322         static unsigned char result[6];
1323         char tmp[3];
1324         unsigned i, j;
1325
1326         for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
1327                 /* ignore ':' and any other non-hex character */
1328                 if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
1329                         continue;
1330                 tmp[0]=string[i];
1331                 tmp[1]=string[i+1];
1332                 tmp[2]='\0';
1333                 result[j]=strtol(tmp,(char **)NULL,16);
1334                 i++;
1335                 j++;
1336                 }
1337
1338         return (j==6) ? result : NULL;
1339         }
1340
1341
1342 void print_hardware_address(const unsigned char *address){
1343         int i;
1344
1345         printf(_("Hardware address: "));
1346         for (i=0; i<5; i++)
1347                 printf("%2.2x:", address[i]);
1348         printf("%2.2x", address[i]);
1349         putchar('\n');
1350         }
1351
1352
1353 /* print usage help */
1354 void print_help(void){
1355
1356         print_revision(progname, NP_VERSION);
1357
1358         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1359         printf (COPYRIGHT, copyright, email);
1360
1361         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1362
1363   printf ("\n\n");
1364
1365         print_usage();
1366
1367         printf (UT_HELP_VRSN);
1368         printf (UT_EXTRA_OPTS);
1369
1370         printf (UT_VERBOSE);
1371
1372         printf (" %s\n", "-s, --serverip=IPADDRESS");
1373   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1374   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1375   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1376   printf (" %s\n", "-t, --timeout=INTEGER");
1377   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1378   printf (" %s\n", "-i, --interface=STRING");
1379   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1380   printf (" %s\n", "-m, --mac=STRING");
1381   printf ("    %s\n", _("MAC address to use in the DHCP request"));
1382   printf (" %s\n", "-u, --unicast");
1383   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
1384
1385   printf (UT_SUPPORT);
1386         return;
1387         }
1388
1389
1390 void
1391 print_usage(void){
1392
1393   printf ("%s\n", _("Usage:"));
1394   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
1395   printf ("                  [-i interface] [-m mac]\n");
1396
1397         return;
1398         }
1399
1400
1401