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 * Unicast mode was originally implemented by Heiti of Boras Kommun with
  38 * general improvements as well as usability fixes and "forward"-porting by
  39 * Andreas Ericsson of OP5 AB.
  40 * ------------------------------------------------------------------------
  41 *
  42 *****************************************************************************/
  43
  44 const char *progname = "check_dhcp";
  45 const char *revision = "$Revision$";
  46 const char *copyright = "2001-2006";
  47 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  48
  49 #include "common.h"
  50 #include "netutils.h"
  51 #include "utils.h"
  52
  53 #include <ctype.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <errno.h>
  58 #include <unistd.h>
  59 #include <sys/time.h>
  60 #include <sys/ioctl.h>
  61 #include <fcntl.h>
  62 #include <getopt.h>
  63 #include <sys/socket.h>
  64 #include <sys/types.h>
  65 #include <netdb.h>
  66 #include <netinet/in.h>
  67 #include <net/if.h>
  68 #include <arpa/inet.h>
  69 #if HAVE_SYS_SOCKIO_H
  70 #include <sys/sockio.h>
  71 #endif
  72
  73 #if defined( __linux__ )
  74
  75 #include <linux/if_ether.h>
  76 #include <features.h>
  77
  78 #elif defined (__bsd__)
  79
  80 #include <netinet/if_ether.h>
  81 #include <sys/param.h>
  82 #include <sys/sysctl.h>
  83 #include <net/if_dl.h>
  84
  85 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
  86
  87 #define INSAP 22
  88 #define OUTSAP 24
  89
  90 #include <signal.h>
  91 #include <ctype.h>
  92 #include <sys/stropts.h>
  93 #include <sys/poll.h>
  94 #include <sys/dlpi.h>
  95
  96 #define bcopy(source, destination, length) memcpy(destination, source, length)
  97
  98 #define AREA_SZ 5000            /* buffer length in bytes */
  99 static u_long ctl_area[AREA_SZ];
 100 static u_long dat_area[AREA_SZ];
 101 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
 102 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
 103
 104 #define GOT_CTRL 1
 105 #define GOT_DATA 2
 106 #define GOT_BOTH 3
 107 #define GOT_INTR 4
 108 #define GOT_ERR 128
 109
 110 #define u_int8_t         uint8_t
 111 #define u_int16_t       uint16_t
 112 #define u_int32_t       uint32_t
 113
 114 static int get_msg(int);
 115 static int check_ctrl(int);
 116 static int put_ctrl(int, int, int);
 117 static int put_both(int, int, int, int);
 118 static int dl_open(const char *, int, int *);
 119 static int dl_bind(int, int, u_char *);
 120 long mac_addr_dlpi( const char *, int, u_char *);
 121
 122 #endif
 123
 124
 125
 126 /**** Common definitions ****/
 127
 128 #define OK                0
 129 #define ERROR             -1
 130
 131 #define FALSE             0
 132 #define TRUE              1
 133
 134
 135 /**** DHCP definitions ****/
 136
 137 #define MAX_DHCP_CHADDR_LENGTH           16
 138 #define MAX_DHCP_SNAME_LENGTH            64
 139 #define MAX_DHCP_FILE_LENGTH             128
 140 #define MAX_DHCP_OPTIONS_LENGTH          312
 141
 142
 143 typedef struct dhcp_packet_struct{
 144         u_int8_t  op;                   /* packet type */
 145         u_int8_t  htype;                /* type of hardware address for this machine (Ethernet, etc) */
 146         u_int8_t  hlen;                 /* length of hardware address (of this machine) */
 147         u_int8_t  hops;                 /* hops */
 148         u_int32_t xid;                  /* random transaction id number - chosen by this machine */
 149         u_int16_t secs;                 /* seconds used in timing */
 150         u_int16_t flags;                /* flags */
 151         struct in_addr ciaddr;          /* IP address of this machine (if we already have one) */
 152         struct in_addr yiaddr;          /* IP address of this machine (offered by the DHCP server) */
 153         struct in_addr siaddr;          /* IP address of DHCP server */
 154         struct in_addr giaddr;          /* IP address of DHCP relay */
 155         unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH];      /* hardware address of this machine */
 156         char sname [MAX_DHCP_SNAME_LENGTH];    /* name of DHCP server */
 157         char file [MAX_DHCP_FILE_LENGTH];      /* boot file name (used for diskless booting?) */
 158         char options[MAX_DHCP_OPTIONS_LENGTH];  /* options */
 159         }dhcp_packet;
 160
 161
 162 typedef struct dhcp_offer_struct{
 163         struct in_addr server_address;   /* address of DHCP server that sent this offer */
 164         struct in_addr offered_address;  /* the IP address that was offered to us */
 165         u_int32_t lease_time;            /* lease time in seconds */
 166         u_int32_t renewal_time;          /* renewal time in seconds */
 167         u_int32_t rebinding_time;        /* rebinding time in seconds */
 168         struct dhcp_offer_struct *next;
 169         }dhcp_offer;
 170
 171
 172 typedef struct requested_server_struct{
 173         struct in_addr server_address;
 174         int answered;
 175         struct requested_server_struct *next;
 176         }requested_server;
 177
 178
 179 #define BOOTREQUEST     1
 180 #define BOOTREPLY       2
 181
 182 #define DHCPDISCOVER    1
 183 #define DHCPOFFER       2
 184 #define DHCPREQUEST     3
 185 #define DHCPDECLINE     4
 186 #define DHCPACK         5
 187 #define DHCPNACK        6
 188 #define DHCPRELEASE     7
 189
 190 #define DHCP_OPTION_MESSAGE_TYPE        53
 191 #define DHCP_OPTION_HOST_NAME           12
 192 #define DHCP_OPTION_BROADCAST_ADDRESS   28
 193 #define DHCP_OPTION_REQUESTED_ADDRESS   50
 194 #define DHCP_OPTION_LEASE_TIME          51
 195 #define DHCP_OPTION_SERVER_IDENTIFIER   54
 196 #define DHCP_OPTION_RENEWAL_TIME        58
 197 #define DHCP_OPTION_REBINDING_TIME      59
 198 #define DHCP_OPTION_END                 255
 199
 200 #define DHCP_INFINITE_TIME              0xFFFFFFFF
 201
 202 #define DHCP_BROADCAST_FLAG 32768
 203 #define DHCP_UNICAST_FLAG   0
 204
 205 #define DHCP_SERVER_PORT   67
 206 #define DHCP_CLIENT_PORT   68
 207
 208 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 209 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 210
 211 u_int8_t unicast = 0;        /* unicast mode: mimic a DHCP relay */
 212 struct in_addr my_ip;        /* our address (required for relay) */
 213 struct in_addr dhcp_ip;      /* server to query (if in unicast mode) */
 214 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 215 unsigned char *user_specified_mac=NULL;
 216
 217 char network_interface_name[IFNAMSIZ]="eth0";
 218
 219 u_int32_t packet_xid=0;
 220
 221 u_int32_t dhcp_lease_time=0;
 222 u_int32_t dhcp_renewal_time=0;
 223 u_int32_t dhcp_rebinding_time=0;
 224
 225 int dhcpoffer_timeout=2;
 226
 227 dhcp_offer *dhcp_offer_list=NULL;
 228 requested_server *requested_server_list=NULL;
 229
 230 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 231 int requested_servers=0;
 232 int requested_responses=0;
 233
 234 int request_specific_address=FALSE;
 235 int received_requested_address=FALSE;
 236 int verbose=0;
 237 struct in_addr requested_address;
 238
 239
 240 int process_arguments(int, char **);
 241 int call_getopt(int, char **);
 242 int validate_arguments(void);
 243 void print_usage(void);
 244 void print_help(void);
 245
 246 void resolve_host(const char *in,struct in_addr *out);
 247 unsigned char *mac_aton(const char *);
 248 void print_hardware_address(const unsigned char *);
 249 int get_hardware_address(int,char *);
 250 int get_ip_address(int,char *);
 251
 252 int send_dhcp_discover(int);
 253 int get_dhcp_offer(int);
 254
 255 int get_results(void);
 256
 257 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 258 int free_dhcp_offer_list(void);
 259 int free_requested_server_list(void);
 260
 261 int create_dhcp_socket(void);
 262 int close_dhcp_socket(int);
 263 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 264 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 265
 266
 267
 268 int main(int argc, char **argv){
 269         int dhcp_socket;
 270         int result = STATE_UNKNOWN;
 271
 272         setlocale (LC_ALL, "");
 273         bindtextdomain (PACKAGE, LOCALEDIR);
 274         textdomain (PACKAGE);
 275
 276         if(process_arguments(argc,argv)!=OK){
 277                 usage4 (_("Could not parse arguments"));
 278                 }
 279
 280         /* this plugin almost certainly needs root permissions. */
 281         np_warn_if_not_root();
 282
 283         /* create socket for DHCP communications */
 284         dhcp_socket=create_dhcp_socket();
 285
 286         /* get hardware address of client machine */
 287         if(user_specified_mac!=NULL)
 288                 memcpy(client_hardware_address,user_specified_mac,6);
 289         else
 290                 get_hardware_address(dhcp_socket,network_interface_name);
 291
 292         if(unicast) /* get IP address of client machine */
 293                 get_ip_address(dhcp_socket,network_interface_name);
 294
 295         /* send DHCPDISCOVER packet */
 296         send_dhcp_discover(dhcp_socket);
 297
 298         /* wait for a DHCPOFFER packet */
 299         get_dhcp_offer(dhcp_socket);
 300
 301         /* close socket we created */
 302         close_dhcp_socket(dhcp_socket);
 303
 304         /* determine state/plugin output to return */
 305         result=get_results();
 306
 307         /* free allocated memory */
 308         free_dhcp_offer_list();
 309         free_requested_server_list();
 310
 311         return result;
 312         }
 313
 314
 315
 316 /* determines hardware address on client machine */
 317 int get_hardware_address(int sock,char *interface_name){
 318
 319 #if defined(__linux__)
 320         struct ifreq ifr;
 321
 322         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 323         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 324
 325         /* try and grab hardware address of requested interface */
 326         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 327                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 328                 exit(STATE_UNKNOWN);
 329                 }
 330
 331         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 332
 333 #elif defined(__bsd__)
 334                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 335
 336         int                     mib[6], len;
 337         char                    *buf;
 338         unsigned char           *ptr;
 339         struct if_msghdr        *ifm;
 340         struct sockaddr_dl      *sdl;
 341
 342         mib[0] = CTL_NET;
 343         mib[1] = AF_ROUTE;
 344         mib[2] = 0;
 345         mib[3] = AF_LINK;
 346         mib[4] = NET_RT_IFLIST;
 347
 348         if((mib[5] = if_nametoindex(interface_name)) == 0){
 349                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 350                 exit(STATE_UNKNOWN);
 351                 }
 352
 353         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 354                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 355                 exit(STATE_UNKNOWN);
 356                 }
 357
 358         if((buf = malloc(len)) == NULL){
 359                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 360                 exit(4);
 361                 }
 362
 363         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 364                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 365                 exit(STATE_UNKNOWN);
 366                 }
 367
 368         ifm = (struct if_msghdr *)buf;
 369         sdl = (struct sockaddr_dl *)(ifm + 1);
 370         ptr = (unsigned char *)LLADDR(sdl);
 371         memcpy(&client_hardware_address[0], ptr, 6) ;
 372                                                 /* King 2004 */
 373
 374 #elif defined(__sun__) || defined(__solaris__)
 375
 376                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 377         long stat;
 378         char dev[20] = "/dev/";
 379         char *p;
 380         int unit;
 381
 382         for(p = interface_name; *p && isalpha(*p); p++)
 383                 /* no-op */ ;
 384         if( p != '\0' ){
 385                 unit = atoi(p) ;
 386                 *p = '\0' ;
 387                 strncat(dev, interface_name, 6) ;
 388                 }
 389         else{
 390                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 391                 exit(STATE_UNKNOWN);
 392                 }
 393         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 394         if(stat != 0){
 395                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 396                 exit(STATE_UNKNOWN);
 397                 }
 398
 399 #elif defined(__hpux__)
 400
 401         long stat;
 402         char dev[20] = "/dev/dlpi" ;
 403         int unit = 0;
 404
 405         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 406         if(stat != 0){
 407                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 408                 exit(STATE_UNKNOWN);
 409                 }
 410                                                 /* Kompf 2000-2003 */
 411
 412 #else
 413         printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
 414         exit(STATE_UNKNOWN);
 415 #endif
 416
 417         if(verbose)
 418                 print_hardware_address(client_hardware_address);
 419
 420         return OK;
 421         }
 422
 423 /* determines IP address of the client interface */
 424 int get_ip_address(int sock,char *interface_name){
 425 #if defined(SIOCGIFADDR)
 426         struct ifreq ifr;
 427
 428         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 429         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 430
 431         if(ioctl(sock,SIOCGIFADDR,&ifr)<0){
 432                 printf(_("Error: Cannot determine IP address of interface %s\n"),
 433                         interface_name);
 434                 exit(STATE_UNKNOWN);
 435                 }
 436
 437         my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
 438
 439 #else
 440         printf(_("Error: Cannot get interface IP address on this platform.\n"));
 441         exit(STATE_UNKNOWN);
 442 #endif
 443
 444         if(verbose)
 445                 printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip));
 446
 447         return OK;
 448         }
 449
 450 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 451 int send_dhcp_discover(int sock){
 452         dhcp_packet discover_packet;
 453         struct sockaddr_in sockaddr_broadcast;
 454     unsigned short opts;
 455
 456
 457         /* clear the packet data structure */
 458         bzero(&discover_packet,sizeof(discover_packet));
 459
 460
 461         /* boot request flag (backward compatible with BOOTP servers) */
 462         discover_packet.op=BOOTREQUEST;
 463
 464         /* hardware address type */
 465         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 466
 467         /* length of our hardware address */
 468         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 469
 470         /*
 471          * transaction ID is supposed to be random.  We won't use the address so
 472          * we don't care about high entropy here.  time(2) is good enough.
 473          */
 474         srand(time(NULL));
 475         packet_xid=random();
 476         discover_packet.xid=htonl(packet_xid);
 477
 478         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 479         /* downright bizzarre... */
 480         ntohl(discover_packet.xid);
 481
 482         /*discover_packet.secs=htons(65535);*/
 483         discover_packet.secs=0xFF;
 484
 485         /*
 486          * server needs to know if it should broadcast or unicast its response:
 487          * 0x8000L == 32768 == 1 << 15 == broadcast, 0 == unicast
 488          */
 489         discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG);
 490
 491         /* our hardware address */
 492         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 493
 494         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 495         discover_packet.options[0]='\x63';
 496         discover_packet.options[1]='\x82';
 497         discover_packet.options[2]='\x53';
 498         discover_packet.options[3]='\x63';
 499
 500     opts = 4;
 501         /* DHCP message type is embedded in options field */
 502         discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 503         discover_packet.options[opts++]='\x01';               /* DHCP message option length in bytes */
 504         discover_packet.options[opts++]=DHCPDISCOVER;
 505
 506         /* the IP address we're requesting */
 507         if(request_specific_address==TRUE){
 508                 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
 509                 discover_packet.options[opts++]='\x04';
 510                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
 511                 opts += sizeof(requested_address);
 512                 }
 513         discover_packet.options[opts++]=DHCP_OPTION_END;
 514
 515         /* unicast fields */
 516         if(unicast)
 517                 discover_packet.giaddr.s_addr = my_ip.s_addr;
 518
 519         /* see RFC 1542, 4.1.1 */
 520         discover_packet.hops = unicast ? 1 : 0;
 521
 522         /* send the DHCPDISCOVER packet to broadcast address */
 523         sockaddr_broadcast.sin_family=AF_INET;
 524         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 525         sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.s_addr : INADDR_BROADCAST;
 526         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 527
 528
 529         if(verbose){
 530                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 531                 printf("DHCPDISCOVER XID: %u (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 532                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 533                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 534                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 535                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 536                 }
 537
 538         /* send the DHCPDISCOVER packet out */
 539         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 540
 541         if(verbose)
 542                 printf("\n\n");
 543
 544         return OK;
 545         }
 546
 547
 548
 549
 550 /* waits for a DHCPOFFER message from one or more DHCP servers */
 551 int get_dhcp_offer(int sock){
 552         dhcp_packet offer_packet;
 553         struct sockaddr_in source;
 554         struct sockaddr_in via;
 555         int result=OK;
 556         int responses=0;
 557         int x;
 558         time_t start_time;
 559         time_t current_time;
 560
 561         time(&start_time);
 562
 563         /* receive as many responses as we can */
 564         for(responses=0,valid_responses=0;;){
 565
 566                 time(&current_time);
 567                 if((current_time-start_time)>=dhcpoffer_timeout)
 568                         break;
 569
 570                 if(verbose)
 571                         printf("\n\n");
 572
 573                 bzero(&source,sizeof(source));
 574                 bzero(&via,sizeof(via));
 575                 bzero(&offer_packet,sizeof(offer_packet));
 576
 577                 result=OK;
 578                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 579
 580                 if(result!=OK){
 581                         if(verbose)
 582                                 printf(_("Result=ERROR\n"));
 583
 584                         continue;
 585                         }
 586                 else{
 587                         if(verbose)
 588                                 printf(_("Result=OK\n"));
 589
 590                         responses++;
 591                         }
 592
 593                 /* The "source" is either a server or a relay. */
 594                 /* Save a copy of "source" into "via" even if it's via itself */
 595                 memcpy(&via,&source,sizeof(source)) ;
 596
 597                 /* If siaddr is non-zero, set "source" to siaddr */
 598                 if(offer_packet.siaddr.s_addr != 0L){
 599                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 600                         }
 601
 602                 if(verbose){
 603                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 604                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 605                         printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 606                         }
 607
 608                 /* check packet xid to see if its the same as the one we used in the discover packet */
 609                 if(ntohl(offer_packet.xid)!=packet_xid){
 610                         if(verbose)
 611                                 printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 612
 613                         continue;
 614                         }
 615
 616                 /* check hardware address */
 617                 result=OK;
 618                 if(verbose)
 619                         printf("DHCPOFFER chaddr: ");
 620
 621                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 622                         if(verbose)
 623                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 624
 625                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 626                                 result=ERROR;
 627                         }
 628                 if(verbose)
 629                         printf("\n");
 630
 631                 if(result==ERROR){
 632                         if(verbose)
 633                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 634
 635                         continue;
 636                         }
 637
 638                 if(verbose){
 639                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 640                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 641                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 642                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 643                         }
 644
 645                 add_dhcp_offer(source.sin_addr,&offer_packet);
 646
 647                 valid_responses++;
 648                 }
 649
 650         if(verbose){
 651                 printf(_("Total responses seen on the wire: %d\n"),responses);
 652                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 653                 }
 654
 655         return OK;
 656         }
 657
 658
 659
 660 /* sends a DHCP packet */
 661 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 662         int result;
 663
 664         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 665
 666         if(verbose)
 667                 printf(_("send_dhcp_packet result: %d\n"),result);
 668
 669         if(result<0)
 670                 return ERROR;
 671
 672         return OK;
 673         }
 674
 675
 676
 677 /* receives a DHCP packet */
 678 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 679         struct timeval tv;
 680         fd_set readfds;
 681         fd_set oobfds;
 682         int recv_result;
 683         socklen_t address_size;
 684         struct sockaddr_in source_address;
 685         int nfound;
 686
 687
 688         /* wait for data to arrive (up time timeout) */
 689         tv.tv_sec=timeout;
 690         tv.tv_usec=0;
 691         FD_ZERO(&readfds);
 692         FD_ZERO(&oobfds);
 693         FD_SET(sock,&readfds);
 694         FD_SET(sock,&oobfds);
 695         nfound = select(sock+1,&readfds,NULL,&oobfds,&tv);
 696
 697         /* make sure some data has arrived */
 698         if(!FD_ISSET(sock,&readfds)){
 699                 if(verbose)
 700                         printf(_("No (more) data received (nfound: %d)\n"), nfound);
 701                 return ERROR;
 702                 }
 703
 704         else{
 705
 706                 /* 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
 707                    not being interpreted correctly.  sigh... */
 708                 bzero(&source_address,sizeof(source_address));
 709                 address_size=sizeof(source_address);
 710                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 711                 if(verbose)
 712                         printf("recv_result_1: %d\n",recv_result);
 713                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 714                 if(verbose)
 715                         printf("recv_result_2: %d\n",recv_result);
 716
 717                 if(recv_result==-1){
 718                         if(verbose){
 719                                 printf(_("recvfrom() failed, "));
 720                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 721                                 }
 722                         return ERROR;
 723                         }
 724                 else{
 725                         if(verbose){
 726                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 727                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 728                                 }
 729
 730                         memcpy(address,&source_address,sizeof(source_address));
 731                         return OK;
 732                         }
 733                 }
 734
 735         return OK;
 736         }
 737
 738
 739 /* creates a socket for DHCP communication */
 740 int create_dhcp_socket(void){
 741         struct sockaddr_in myname;
 742         struct ifreq interface;
 743         int sock;
 744         int flag=1;
 745
 746         /* Set up the address we're going to bind to. */
 747         bzero(&myname,sizeof(myname));
 748         myname.sin_family=AF_INET;
 749         /* listen to DHCP server port if we're in unicast mode */
 750         myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT);
 751         myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY;
 752         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 753
 754         /* create a socket for DHCP communications */
 755         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 756         if(sock<0){
 757                 printf(_("Error: Could not create socket!\n"));
 758                 exit(STATE_UNKNOWN);
 759                 }
 760
 761         if(verbose)
 762                 printf("DHCP socket: %d\n",sock);
 763
 764         /* set the reuse address flag so we don't get errors when restarting */
 765         flag=1;
 766         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 767                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 768                 exit(STATE_UNKNOWN);
 769                 }
 770
 771         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 772         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 773                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 774                 exit(STATE_UNKNOWN);
 775                 }
 776
 777         /* bind socket to interface */
 778 #if defined(__linux__)
 779         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ-1);
 780         interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
 781         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 782                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 783                 exit(STATE_UNKNOWN);
 784                 }
 785
 786 #else
 787         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ-1);
 788         interface.ifr_name[IFNAMSIZ-1]='\0';
 789 #endif
 790
 791         /* bind the socket */
 792         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 793                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 794                 exit(STATE_UNKNOWN);
 795                 }
 796
 797         return sock;
 798         }
 799
 800
 801 /* closes DHCP socket */
 802 int close_dhcp_socket(int sock){
 803
 804         close(sock);
 805
 806         return OK;
 807         }
 808
 809
 810 /* adds a requested server address to list in memory */
 811 int add_requested_server(struct in_addr server_address){
 812         requested_server *new_server;
 813
 814         new_server=(requested_server *)malloc(sizeof(requested_server));
 815         if(new_server==NULL)
 816                 return ERROR;
 817
 818         new_server->server_address=server_address;
 819         new_server->answered=FALSE;
 820
 821         new_server->next=requested_server_list;
 822         requested_server_list=new_server;
 823
 824         requested_servers++;
 825
 826         if(verbose)
 827                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 828
 829         return OK;
 830         }
 831
 832
 833
 834
 835 /* adds a DHCP OFFER to list in memory */
 836 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 837         dhcp_offer *new_offer;
 838         int x;
 839         unsigned option_type;
 840         unsigned option_length;
 841         struct in_addr serv_ident = {0};
 842
 843         if(offer_packet==NULL)
 844                 return ERROR;
 845
 846         /* process all DHCP options present in the packet */
 847         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 848
 849                 /* end of options (0 is really just a pad, but bail out anyway) */
 850                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 851                         break;
 852
 853                 /* get option type */
 854                 option_type=offer_packet->options[x++];
 855
 856                 /* get option length */
 857                 option_length=offer_packet->options[x++];
 858
 859                 if(verbose)
 860                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 861
 862                 /* get option data */
 863                 switch(option_type){
 864                 case DHCP_OPTION_LEASE_TIME:
 865                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 866                         dhcp_lease_time = ntohl(dhcp_lease_time);
 867                         break;
 868                 case DHCP_OPTION_RENEWAL_TIME:
 869                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 870                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 871                         break;
 872                 case DHCP_OPTION_REBINDING_TIME:
 873                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 874                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 875                         break;
 876                 case DHCP_OPTION_SERVER_IDENTIFIER:
 877                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 878                         break;
 879                         }
 880
 881                 /* skip option data we're ignoring */
 882                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 883                         x+=option_length;
 884                 }
 885
 886         if(verbose){
 887                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 888                         printf(_("Lease Time: Infinite\n"));
 889                 else
 890                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 891                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 892                         printf(_("Renewal Time: Infinite\n"));
 893                 else
 894                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 895                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 896                         printf(_("Rebinding Time: Infinite\n"));
 897                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 898                 }
 899
 900         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 901
 902         if(new_offer==NULL)
 903                 return ERROR;
 904
 905         /*
 906          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 907          * 'siaddr' field as the address of the server to use in the next step
 908          * of the client's bootstrap process.  A DHCP server may return its own
 909          * address in the 'siaddr' field, if the server is prepared to supply
 910          * the next bootstrap service (e.g., delivery of an operating system
 911          * executable image).  A DHCP server always returns its own address in
 912          * the 'server identifier' option."  'serv_ident' is the 'server
 913          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 914          * wasn't available) the IP address we received the DHCPOFFER from.  If
 915          * 'serv_ident' isn't available for some reason, we use 'source'.
 916          */
 917         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 918         new_offer->offered_address=offer_packet->yiaddr;
 919         new_offer->lease_time=dhcp_lease_time;
 920         new_offer->renewal_time=dhcp_renewal_time;
 921         new_offer->rebinding_time=dhcp_rebinding_time;
 922
 923
 924         if(verbose){
 925                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 926                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 927                 }
 928
 929         /* add new offer to head of list */
 930         new_offer->next=dhcp_offer_list;
 931         dhcp_offer_list=new_offer;
 932
 933         return OK;
 934         }
 935
 936
 937 /* frees memory allocated to DHCP OFFER list */
 938 int free_dhcp_offer_list(void){
 939         dhcp_offer *this_offer;
 940         dhcp_offer *next_offer;
 941
 942         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 943                 next_offer=this_offer->next;
 944                 free(this_offer);
 945                 }
 946
 947         return OK;
 948         }
 949
 950
 951 /* frees memory allocated to requested server list */
 952 int free_requested_server_list(void){
 953         requested_server *this_server;
 954         requested_server *next_server;
 955
 956         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 957                 next_server=this_server->next;
 958                 free(this_server);
 959                 }
 960
 961         return OK;
 962         }
 963
 964
 965 /* gets state and plugin output to return */
 966 int get_results(void){
 967         dhcp_offer *temp_offer;
 968         requested_server *temp_server;
 969         int result;
 970         u_int32_t max_lease_time=0;
 971
 972         received_requested_address=FALSE;
 973
 974         /* checks responses from requested servers */
 975         requested_responses=0;
 976         if(requested_servers>0){
 977
 978                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 979
 980                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 981
 982                                 /* get max lease time we were offered */
 983                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 984                                         max_lease_time=temp_offer->lease_time;
 985
 986                                 /* see if we got the address we requested */
 987                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 988                                         received_requested_address=TRUE;
 989
 990                                 /* see if the servers we wanted a response from talked to us or not */
 991                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 992                                         if(verbose){
 993                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 994                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 995                                                 if(temp_server->answered)
 996                                                         printf(_(" (duplicate)"));
 997                                                 printf(_("\n"));
 998                                                 }
 999                                         if(temp_server->answered == FALSE){
1000                                                 requested_responses++;
1001                                                 temp_server->answered=TRUE;
1002                                                 }
1003                                         }
1004                                 }
1005                         }
1006
1007                 }
1008
1009         /* else check and see if we got our requested address from any server */
1010         else{
1011
1012                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
1013
1014                         /* get max lease time we were offered */
1015                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
1016                                 max_lease_time=temp_offer->lease_time;
1017
1018                         /* see if we got the address we requested */
1019                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
1020                                 received_requested_address=TRUE;
1021                         }
1022                 }
1023
1024         result=STATE_OK;
1025         if(valid_responses==0)
1026                 result=STATE_CRITICAL;
1027         else if(requested_servers>0 && requested_responses==0)
1028                 result=STATE_CRITICAL;
1029         else if(requested_responses<requested_servers)
1030                 result=STATE_WARNING;
1031         else if(request_specific_address==TRUE && received_requested_address==FALSE)
1032                 result=STATE_WARNING;
1033
1034         if(result==0)               /* garrett honeycutt 2005 */
1035                 printf("OK: ");
1036         else if(result==1)
1037                 printf("WARNING: ");
1038         else if(result==2)
1039                 printf("CRITICAL: ");
1040         else if(result==3)
1041                 printf("UNKNOWN: ");
1042
1043         /* we didn't receive any DHCPOFFERs */
1044         if(dhcp_offer_list==NULL){
1045                 printf(_("No DHCPOFFERs were received.\n"));
1046                 return result;
1047                 }
1048
1049         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
1050
1051         if(requested_servers>0)
1052                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
1053
1054         if(request_specific_address==TRUE)
1055                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
1056
1057         printf(_(", max lease time = "));
1058         if(max_lease_time==DHCP_INFINITE_TIME)
1059                 printf(_("Infinity"));
1060         else
1061                 printf("%lu sec",(unsigned long)max_lease_time);
1062
1063         printf(".\n");
1064
1065         return result;
1066         }
1067
1068
1069 /* process command-line arguments */
1070 int process_arguments(int argc, char **argv){
1071         int c;
1072
1073         if(argc<1)
1074                 return ERROR;
1075
1076         c=0;
1077         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1078
1079                 /*
1080                 if(is_option(argv[c]))
1081                         continue;
1082                 */
1083                 }
1084
1085         return validate_arguments();
1086         }
1087
1088
1089
1090 int call_getopt(int argc, char **argv){
1091         int c=0;
1092         int i=0;
1093
1094         int option_index = 0;
1095         static struct option long_options[] =
1096         {
1097                 {"serverip",       required_argument,0,'s'},
1098                 {"requestedip",    required_argument,0,'r'},
1099                 {"timeout",        required_argument,0,'t'},
1100                 {"interface",      required_argument,0,'i'},
1101                 {"mac",            required_argument,0,'m'},
1102                 {"unicast",        no_argument,      0,'u'},
1103                 {"verbose",        no_argument,      0,'v'},
1104                 {"version",        no_argument,      0,'V'},
1105                 {"help",           no_argument,      0,'h'},
1106                 {0,0,0,0}
1107         };
1108
1109         while(1){
1110                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
1111
1112                 i++;
1113
1114                 if(c==-1||c==EOF||c==1)
1115                         break;
1116
1117                 switch(c){
1118                 case 'w':
1119                 case 'r':
1120                 case 't':
1121                 case 'i':
1122                         i++;
1123                         break;
1124                 default:
1125                         break;
1126                         }
1127
1128                 switch(c){
1129
1130                 case 's': /* DHCP server address */
1131                         resolve_host(optarg,&dhcp_ip);
1132                         add_requested_server(dhcp_ip);
1133                         break;
1134
1135                 case 'r': /* address we are requested from DHCP servers */
1136                         resolve_host(optarg,&requested_address);
1137                         request_specific_address=TRUE;
1138                         break;
1139
1140                 case 't': /* timeout */
1141
1142                         /*
1143                         if(is_intnonneg(optarg))
1144                         */
1145                         if(atoi(optarg)>0)
1146                                 dhcpoffer_timeout=atoi(optarg);
1147                         /*
1148                         else
1149                                 usage("Time interval must be a nonnegative integer\n");
1150                         */
1151                         break;
1152
1153                 case 'm': /* MAC address */
1154
1155                         if((user_specified_mac=mac_aton(optarg)) == NULL)
1156                                 usage("Cannot parse MAC address.\n");
1157                         if(verbose)
1158                                 print_hardware_address(user_specified_mac);
1159
1160                         break;
1161
1162                 case 'i': /* interface name */
1163
1164                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1165                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1166
1167                         break;
1168
1169                 case 'u': /* unicast testing */
1170                         unicast=1;
1171                         break;
1172
1173                 case 'V': /* version */
1174                         print_revision(progname,revision);
1175                         exit(STATE_OK);
1176
1177                 case 'h': /* help */
1178                         print_help();
1179                         exit(STATE_OK);
1180
1181                 case 'v': /* verbose */
1182                         verbose=1;
1183                         break;
1184
1185                 case '?': /* help */
1186                         usage5 ();
1187                         break;
1188
1189                 default:
1190                         break;
1191                         }
1192                 }
1193
1194         return i;
1195         }
1196
1197
1198 int validate_arguments(void){
1199
1200         return OK;
1201         }
1202
1203
1204 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1205 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1206
1207 /* get a message from a stream; return type of message */
1208 static int get_msg(int fd){
1209         int flags = 0;
1210         int res, ret;
1211         ctl_area[0] = 0;
1212         dat_area[0] = 0;
1213         ret = 0;
1214         res = getmsg(fd, &ctl, &dat, &flags);
1215
1216         if(res < 0){
1217                 if(errno == EINTR){
1218                         return(GOT_INTR);
1219                         }
1220                 else{
1221                         printf("%s\n", "get_msg FAILED.");
1222                         return(GOT_ERR);
1223                         }
1224                 }
1225         if(ctl.len > 0){
1226                 ret |= GOT_CTRL;
1227                 }
1228         if(dat.len > 0){
1229                 ret |= GOT_DATA;
1230                 }
1231
1232         return(ret);
1233         }
1234
1235 /* verify that dl_primitive in ctl_area = prim */
1236 static int check_ctrl(int prim){
1237         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1238
1239         if(err_ack->dl_primitive != prim){
1240                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1241                 exit(STATE_UNKNOWN);
1242                 }
1243
1244         return 0;
1245         }
1246
1247 /* put a control message on a stream */
1248 static int put_ctrl(int fd, int len, int pri){
1249
1250         ctl.len = len;
1251         if(putmsg(fd, &ctl, 0, pri) < 0){
1252                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1253                 exit(STATE_UNKNOWN);
1254                 }
1255
1256         return  0;
1257         }
1258
1259 /* put a control + data message on a stream */
1260 static int put_both(int fd, int clen, int dlen, int pri){
1261
1262         ctl.len = clen;
1263         dat.len = dlen;
1264         if(putmsg(fd, &ctl, &dat, pri) < 0){
1265                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1266                 exit(STATE_UNKNOWN);
1267                 }
1268
1269         return  0;
1270         }
1271
1272 /* open file descriptor and attach */
1273 static int dl_open(const char *dev, int unit, int *fd){
1274         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1275
1276         if((*fd = open(dev, O_RDWR)) == -1){
1277                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1278                 exit(STATE_UNKNOWN);
1279                 }
1280         attach_req->dl_primitive = DL_ATTACH_REQ;
1281         attach_req->dl_ppa = unit;
1282         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1283         get_msg(*fd);
1284         return check_ctrl(DL_OK_ACK);
1285         }
1286
1287 /* send DL_BIND_REQ */
1288 static int dl_bind(int fd, int sap, u_char *addr){
1289         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1290         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1291
1292         bind_req->dl_primitive = DL_BIND_REQ;
1293         bind_req->dl_sap = sap;
1294         bind_req->dl_max_conind = 1;
1295         bind_req->dl_service_mode = DL_CLDLS;
1296         bind_req->dl_conn_mgmt = 0;
1297         bind_req->dl_xidtest_flg = 0;
1298         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1299         get_msg(fd);
1300         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1301                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1302                 exit(STATE_UNKNOWN);
1303                 }
1304         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1305               bind_ack->dl_addr_length);
1306
1307         return 0;
1308         }
1309
1310 /***********************************************************************
1311  * interface:
1312  * function mac_addr_dlpi - get the mac address of the interface with
1313  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1314  *
1315  * parameter: addr: an array of six bytes, has to be allocated by the caller
1316  *
1317  * return: 0 if OK, -1 if the address could not be determined
1318  *
1319  *
1320  ***********************************************************************/
1321
1322 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1323         int fd;
1324         u_char mac_addr[25];
1325
1326         if(GOT_ERR != dl_open(dev, unit, &fd)){
1327                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1328                         bcopy( mac_addr, addr, 6);
1329                         return 0;
1330                         }
1331                 }
1332         close(fd);
1333
1334         return -1;
1335         }
1336
1337 /* Kompf 2000-2003 */
1338 #endif
1339
1340
1341 /* resolve host name or die (TODO: move this to netutils.c!) */
1342 void resolve_host(const char *in,struct in_addr *out){
1343         struct addrinfo hints, *ai;
1344
1345         memset(&hints,0,sizeof(hints));
1346         hints.ai_family=PF_INET;
1347         if (getaddrinfo(in,NULL,&hints,&ai) != 0)
1348                 usage_va(_("Invalid hostname/address - %s"),optarg);
1349
1350         memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out));
1351         freeaddrinfo(ai);
1352         }
1353
1354
1355 /* parse MAC address string, return 6 bytes (unterminated) or NULL */
1356 unsigned char *mac_aton(const char *string){
1357         static unsigned char result[6];
1358         char tmp[3];
1359         unsigned i, j;
1360
1361         for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
1362                 /* ignore ':' and any other non-hex character */
1363                 if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
1364                         continue;
1365                 tmp[0]=string[i];
1366                 tmp[1]=string[i+1];
1367                 tmp[2]='\0';
1368                 result[j]=strtol(tmp,(char **)NULL,16);
1369                 i++;
1370                 j++;
1371                 }
1372
1373         return (j==6) ? result : NULL;
1374         }
1375
1376
1377 void print_hardware_address(const unsigned char *address){
1378         int i;
1379
1380         printf(_("Hardware address: "));
1381         for (i=0; i<5; i++)
1382                 printf("%2.2x:", address[i]);
1383         printf("%2.2x", address[i]);
1384         putchar('\n');
1385         }
1386
1387
1388 /* print usage help */
1389 void print_help(void){
1390
1391         print_revision(progname,revision);
1392
1393         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1394         printf (COPYRIGHT, copyright, email);
1395
1396         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1397
1398   printf ("\n\n");
1399
1400         print_usage();
1401
1402         printf (_(UT_HELP_VRSN));
1403
1404         printf (_(UT_VERBOSE));
1405
1406         printf (" %s\n", "-s, --serverip=IPADDRESS");
1407   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1408   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1409   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1410   printf (" %s\n", "-t, --timeout=INTEGER");
1411   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1412   printf (" %s\n", "-i, --interface=STRING");
1413   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1414   printf (" %s\n", "-m, --mac=STRING");
1415   printf ("    %s\n", _("MAC address to use in the DHCP request"));
1416   printf (" %s\n", "-u, --unicast");
1417   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
1418
1419         return;
1420         }
1421
1422
1423 void
1424 print_usage(void){
1425
1426   printf (_("Usage:"));
1427   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
1428   printf ("                  [-i interface] [-m mac]\n");
1429
1430         return;
1431         }
1432
1433
1434