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) 2001-2007 Nagios Plugin 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 = "nagiosplug-devel@lists.sourceforge.net";
  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 DHCP 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(void);
 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         /* this plugin almost certainly needs root permissions. */
 274         np_warn_if_not_root();
 275
 276         /* create socket for DHCP communications */
 277         dhcp_socket=create_dhcp_socket();
 278
 279         /* get hardware address of client machine */
 280         if(user_specified_mac!=NULL)
 281                 memcpy(client_hardware_address,user_specified_mac,6);
 282         else
 283                 get_hardware_address(dhcp_socket,network_interface_name);
 284
 285         if(unicast) /* get IP address of client machine */
 286                 get_ip_address(dhcp_socket,network_interface_name);
 287
 288         /* send DHCPDISCOVER packet */
 289         send_dhcp_discover(dhcp_socket);
 290
 291         /* wait for a DHCPOFFER packet */
 292         get_dhcp_offer(dhcp_socket);
 293
 294         /* close socket we created */
 295         close_dhcp_socket(dhcp_socket);
 296
 297         /* determine state/plugin output to return */
 298         result=get_results();
 299
 300         /* free allocated memory */
 301         free_dhcp_offer_list();
 302         free_requested_server_list();
 303
 304         return result;
 305         }
 306
 307
 308
 309 /* determines hardware address on client machine */
 310 int get_hardware_address(int sock,char *interface_name){
 311
 312 #if defined(__linux__)
 313         struct ifreq ifr;
 314
 315         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 316         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 317
 318         /* try and grab hardware address of requested interface */
 319         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 320                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 321                 exit(STATE_UNKNOWN);
 322                 }
 323
 324         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 325
 326 #elif defined(__bsd__)
 327                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 328
 329         int                     mib[6], len;
 330         char                    *buf;
 331         unsigned char           *ptr;
 332         struct if_msghdr        *ifm;
 333         struct sockaddr_dl      *sdl;
 334
 335         mib[0] = CTL_NET;
 336         mib[1] = AF_ROUTE;
 337         mib[2] = 0;
 338         mib[3] = AF_LINK;
 339         mib[4] = NET_RT_IFLIST;
 340
 341         if((mib[5] = if_nametoindex(interface_name)) == 0){
 342                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 343                 exit(STATE_UNKNOWN);
 344                 }
 345
 346         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 347                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 348                 exit(STATE_UNKNOWN);
 349                 }
 350
 351         if((buf = malloc(len)) == NULL){
 352                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 353                 exit(4);
 354                 }
 355
 356         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 357                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 358                 exit(STATE_UNKNOWN);
 359                 }
 360
 361         ifm = (struct if_msghdr *)buf;
 362         sdl = (struct sockaddr_dl *)(ifm + 1);
 363         ptr = (unsigned char *)LLADDR(sdl);
 364         memcpy(&client_hardware_address[0], ptr, 6) ;
 365                                                 /* King 2004 */
 366
 367 #elif defined(__sun__) || defined(__solaris__)
 368
 369                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 370         long stat;
 371         char dev[20] = "/dev/";
 372         char *p;
 373         int unit;
 374
 375         for(p = interface_name; *p && isalpha(*p); p++)
 376                 /* no-op */ ;
 377         if( p != '\0' ){
 378                 unit = atoi(p) ;
 379                 *p = '\0' ;
 380                 strncat(dev, interface_name, 6) ;
 381                 }
 382         else{
 383                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 384                 exit(STATE_UNKNOWN);
 385                 }
 386         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 387         if(stat != 0){
 388                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 389                 exit(STATE_UNKNOWN);
 390                 }
 391
 392 #elif defined(__hpux__)
 393
 394         long stat;
 395         char dev[20] = "/dev/dlpi" ;
 396         int unit = 0;
 397
 398         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 399         if(stat != 0){
 400                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 401                 exit(STATE_UNKNOWN);
 402                 }
 403                                                 /* Kompf 2000-2003 */
 404
 405 #else
 406         printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
 407         exit(STATE_UNKNOWN);
 408 #endif
 409
 410         if(verbose)
 411                 print_hardware_address(client_hardware_address);
 412
 413         return OK;
 414         }
 415
 416 /* determines IP address of the client interface */
 417 int get_ip_address(int sock,char *interface_name){
 418 #if defined(SIOCGIFADDR)
 419         struct ifreq ifr;
 420
 421         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 422         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 423
 424         if(ioctl(sock,SIOCGIFADDR,&ifr)<0){
 425                 printf(_("Error: Cannot determine IP address of interface %s\n"),
 426                         interface_name);
 427                 exit(STATE_UNKNOWN);
 428                 }
 429
 430         my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
 431
 432 #else
 433         printf(_("Error: Cannot get interface IP address on this platform.\n"));
 434         exit(STATE_UNKNOWN);
 435 #endif
 436
 437         if(verbose)
 438                 printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip));
 439
 440         return OK;
 441         }
 442
 443 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 444 int send_dhcp_discover(int sock){
 445         dhcp_packet discover_packet;
 446         struct sockaddr_in sockaddr_broadcast;
 447     unsigned short opts;
 448
 449
 450         /* clear the packet data structure */
 451         bzero(&discover_packet,sizeof(discover_packet));
 452
 453
 454         /* boot request flag (backward compatible with BOOTP servers) */
 455         discover_packet.op=BOOTREQUEST;
 456
 457         /* hardware address type */
 458         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 459
 460         /* length of our hardware address */
 461         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 462
 463         /*
 464          * transaction ID is supposed to be random.  We won't use the address so
 465          * we don't care about high entropy here.  time(2) is good enough.
 466          */
 467         srand(time(NULL));
 468         packet_xid=random();
 469         discover_packet.xid=htonl(packet_xid);
 470
 471         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 472         /* downright bizzarre... */
 473         ntohl(discover_packet.xid);
 474
 475         /*discover_packet.secs=htons(65535);*/
 476         discover_packet.secs=0xFF;
 477
 478         /*
 479          * server needs to know if it should broadcast or unicast its response:
 480          * 0x8000L == 32768 == 1 << 15 == broadcast, 0 == unicast
 481          */
 482         discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG);
 483
 484         /* our hardware address */
 485         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 486
 487         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 488         discover_packet.options[0]='\x63';
 489         discover_packet.options[1]='\x82';
 490         discover_packet.options[2]='\x53';
 491         discover_packet.options[3]='\x63';
 492
 493     opts = 4;
 494         /* DHCP message type is embedded in options field */
 495         discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 496         discover_packet.options[opts++]='\x01';               /* DHCP message option length in bytes */
 497         discover_packet.options[opts++]=DHCPDISCOVER;
 498
 499         /* the IP address we're requesting */
 500         if(request_specific_address==TRUE){
 501                 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
 502                 discover_packet.options[opts++]='\x04';
 503                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
 504                 opts += sizeof(requested_address);
 505                 }
 506         discover_packet.options[opts++]=DHCP_OPTION_END;
 507
 508         /* unicast fields */
 509         if(unicast)
 510                 discover_packet.giaddr.s_addr = my_ip.s_addr;
 511
 512         /* see RFC 1542, 4.1.1 */
 513         discover_packet.hops = unicast ? 1 : 0;
 514
 515         /* send the DHCPDISCOVER packet to broadcast address */
 516         sockaddr_broadcast.sin_family=AF_INET;
 517         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 518         sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.s_addr : INADDR_BROADCAST;
 519         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 520
 521
 522         if(verbose){
 523                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 524                 printf("DHCPDISCOVER XID: %u (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 525                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 526                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 527                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 528                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 529                 }
 530
 531         /* send the DHCPDISCOVER packet out */
 532         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 533
 534         if(verbose)
 535                 printf("\n\n");
 536
 537         return OK;
 538         }
 539
 540
 541
 542
 543 /* waits for a DHCPOFFER message from one or more DHCP servers */
 544 int get_dhcp_offer(int sock){
 545         dhcp_packet offer_packet;
 546         struct sockaddr_in source;
 547         struct sockaddr_in via;
 548         int result=OK;
 549         int responses=0;
 550         int x;
 551         time_t start_time;
 552         time_t current_time;
 553
 554         time(&start_time);
 555
 556         /* receive as many responses as we can */
 557         for(responses=0,valid_responses=0;;){
 558
 559                 time(&current_time);
 560                 if((current_time-start_time)>=dhcpoffer_timeout)
 561                         break;
 562
 563                 if(verbose)
 564                         printf("\n\n");
 565
 566                 bzero(&source,sizeof(source));
 567                 bzero(&via,sizeof(via));
 568                 bzero(&offer_packet,sizeof(offer_packet));
 569
 570                 result=OK;
 571                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 572
 573                 if(result!=OK){
 574                         if(verbose)
 575                                 printf(_("Result=ERROR\n"));
 576
 577                         continue;
 578                         }
 579                 else{
 580                         if(verbose)
 581                                 printf(_("Result=OK\n"));
 582
 583                         responses++;
 584                         }
 585
 586                 /* The "source" is either a server or a relay. */
 587                 /* Save a copy of "source" into "via" even if it's via itself */
 588                 memcpy(&via,&source,sizeof(source)) ;
 589
 590                 /* If siaddr is non-zero, set "source" to siaddr */
 591                 if(offer_packet.siaddr.s_addr != 0L){
 592                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 593                         }
 594
 595                 if(verbose){
 596                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 597                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 598                         printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 599                         }
 600
 601                 /* check packet xid to see if its the same as the one we used in the discover packet */
 602                 if(ntohl(offer_packet.xid)!=packet_xid){
 603                         if(verbose)
 604                                 printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 605
 606                         continue;
 607                         }
 608
 609                 /* check hardware address */
 610                 result=OK;
 611                 if(verbose)
 612                         printf("DHCPOFFER chaddr: ");
 613
 614                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 615                         if(verbose)
 616                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 617
 618                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 619                                 result=ERROR;
 620                         }
 621                 if(verbose)
 622                         printf("\n");
 623
 624                 if(result==ERROR){
 625                         if(verbose)
 626                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 627
 628                         continue;
 629                         }
 630
 631                 if(verbose){
 632                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 633                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 634                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 635                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 636                         }
 637
 638                 add_dhcp_offer(source.sin_addr,&offer_packet);
 639
 640                 valid_responses++;
 641                 }
 642
 643         if(verbose){
 644                 printf(_("Total responses seen on the wire: %d\n"),responses);
 645                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 646                 }
 647
 648         return OK;
 649         }
 650
 651
 652
 653 /* sends a DHCP packet */
 654 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 655         int result;
 656
 657         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 658
 659         if(verbose)
 660                 printf(_("send_dhcp_packet result: %d\n"),result);
 661
 662         if(result<0)
 663                 return ERROR;
 664
 665         return OK;
 666         }
 667
 668
 669
 670 /* receives a DHCP packet */
 671 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 672         struct timeval tv;
 673         fd_set readfds;
 674         fd_set oobfds;
 675         int recv_result;
 676         socklen_t address_size;
 677         struct sockaddr_in source_address;
 678         int nfound;
 679
 680
 681         /* wait for data to arrive (up time timeout) */
 682         tv.tv_sec=timeout;
 683         tv.tv_usec=0;
 684         FD_ZERO(&readfds);
 685         FD_ZERO(&oobfds);
 686         FD_SET(sock,&readfds);
 687         FD_SET(sock,&oobfds);
 688         nfound = select(sock+1,&readfds,NULL,&oobfds,&tv);
 689
 690         /* make sure some data has arrived */
 691         if(!FD_ISSET(sock,&readfds)){
 692                 if(verbose)
 693                         printf(_("No (more) data received (nfound: %d)\n"), nfound);
 694                 return ERROR;
 695                 }
 696
 697         else{
 698
 699                 /* 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
 700                    not being interpreted correctly.  sigh... */
 701                 bzero(&source_address,sizeof(source_address));
 702                 address_size=sizeof(source_address);
 703                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 704                 if(verbose)
 705                         printf("recv_result_1: %d\n",recv_result);
 706                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 707                 if(verbose)
 708                         printf("recv_result_2: %d\n",recv_result);
 709
 710                 if(recv_result==-1){
 711                         if(verbose){
 712                                 printf(_("recvfrom() failed, "));
 713                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 714                                 }
 715                         return ERROR;
 716                         }
 717                 else{
 718                         if(verbose){
 719                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 720                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 721                                 }
 722
 723                         memcpy(address,&source_address,sizeof(source_address));
 724                         return OK;
 725                         }
 726                 }
 727
 728         return OK;
 729         }
 730
 731
 732 /* creates a socket for DHCP communication */
 733 int create_dhcp_socket(void){
 734         struct sockaddr_in myname;
 735         struct ifreq interface;
 736         int sock;
 737         int flag=1;
 738
 739         /* Set up the address we're going to bind to. */
 740         bzero(&myname,sizeof(myname));
 741         myname.sin_family=AF_INET;
 742         /* listen to DHCP server port if we're in unicast mode */
 743         myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT);
 744         myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY;
 745         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 746
 747         /* create a socket for DHCP communications */
 748         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 749         if(sock<0){
 750                 printf(_("Error: Could not create socket!\n"));
 751                 exit(STATE_UNKNOWN);
 752                 }
 753
 754         if(verbose)
 755                 printf("DHCP socket: %d\n",sock);
 756
 757         /* set the reuse address flag so we don't get errors when restarting */
 758         flag=1;
 759         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 760                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 761                 exit(STATE_UNKNOWN);
 762                 }
 763
 764         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 765         if(!unicast && setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 766                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 767                 exit(STATE_UNKNOWN);
 768                 }
 769
 770         /* bind socket to interface */
 771 #if defined(__linux__)
 772         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ-1);
 773         interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
 774         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 775                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 776                 exit(STATE_UNKNOWN);
 777                 }
 778
 779 #else
 780         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ-1);
 781         interface.ifr_name[IFNAMSIZ-1]='\0';
 782 #endif
 783
 784         /* bind the socket */
 785         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 786                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 787                 exit(STATE_UNKNOWN);
 788                 }
 789
 790         return sock;
 791         }
 792
 793
 794 /* closes DHCP socket */
 795 int close_dhcp_socket(int sock){
 796
 797         close(sock);
 798
 799         return OK;
 800         }
 801
 802
 803 /* adds a requested server address to list in memory */
 804 int add_requested_server(struct in_addr server_address){
 805         requested_server *new_server;
 806
 807         new_server=(requested_server *)malloc(sizeof(requested_server));
 808         if(new_server==NULL)
 809                 return ERROR;
 810
 811         new_server->server_address=server_address;
 812         new_server->answered=FALSE;
 813
 814         new_server->next=requested_server_list;
 815         requested_server_list=new_server;
 816
 817         requested_servers++;
 818
 819         if(verbose)
 820                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 821
 822         return OK;
 823         }
 824
 825
 826
 827
 828 /* adds a DHCP OFFER to list in memory */
 829 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 830         dhcp_offer *new_offer;
 831         int x;
 832         unsigned option_type;
 833         unsigned option_length;
 834         struct in_addr serv_ident = {0};
 835
 836         if(offer_packet==NULL)
 837                 return ERROR;
 838
 839         /* process all DHCP options present in the packet */
 840         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 841
 842                 /* end of options (0 is really just a pad, but bail out anyway) */
 843                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 844                         break;
 845
 846                 /* get option type */
 847                 option_type=offer_packet->options[x++];
 848
 849                 /* get option length */
 850                 option_length=offer_packet->options[x++];
 851
 852                 if(verbose)
 853                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 854
 855                 /* get option data */
 856                 switch(option_type){
 857                 case DHCP_OPTION_LEASE_TIME:
 858                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 859                         dhcp_lease_time = ntohl(dhcp_lease_time);
 860                         break;
 861                 case DHCP_OPTION_RENEWAL_TIME:
 862                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 863                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 864                         break;
 865                 case DHCP_OPTION_REBINDING_TIME:
 866                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 867                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 868                         break;
 869                 case DHCP_OPTION_SERVER_IDENTIFIER:
 870                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 871                         break;
 872                         }
 873
 874                 /* skip option data we're ignoring */
 875                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 876                         x+=option_length;
 877                 }
 878
 879         if(verbose){
 880                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 881                         printf(_("Lease Time: Infinite\n"));
 882                 else
 883                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 884                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 885                         printf(_("Renewal Time: Infinite\n"));
 886                 else
 887                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 888                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 889                         printf(_("Rebinding Time: Infinite\n"));
 890                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 891                 }
 892
 893         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 894
 895         if(new_offer==NULL)
 896                 return ERROR;
 897
 898         /*
 899          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 900          * 'siaddr' field as the address of the server to use in the next step
 901          * of the client's bootstrap process.  A DHCP server may return its own
 902          * address in the 'siaddr' field, if the server is prepared to supply
 903          * the next bootstrap service (e.g., delivery of an operating system
 904          * executable image).  A DHCP server always returns its own address in
 905          * the 'server identifier' option."  'serv_ident' is the 'server
 906          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 907          * wasn't available) the IP address we received the DHCPOFFER from.  If
 908          * 'serv_ident' isn't available for some reason, we use 'source'.
 909          */
 910         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 911         new_offer->offered_address=offer_packet->yiaddr;
 912         new_offer->lease_time=dhcp_lease_time;
 913         new_offer->renewal_time=dhcp_renewal_time;
 914         new_offer->rebinding_time=dhcp_rebinding_time;
 915
 916
 917         if(verbose){
 918                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 919                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 920                 }
 921
 922         /* add new offer to head of list */
 923         new_offer->next=dhcp_offer_list;
 924         dhcp_offer_list=new_offer;
 925
 926         return OK;
 927         }
 928
 929
 930 /* frees memory allocated to DHCP OFFER list */
 931 int free_dhcp_offer_list(void){
 932         dhcp_offer *this_offer;
 933         dhcp_offer *next_offer;
 934
 935         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 936                 next_offer=this_offer->next;
 937                 free(this_offer);
 938                 }
 939
 940         return OK;
 941         }
 942
 943
 944 /* frees memory allocated to requested server list */
 945 int free_requested_server_list(void){
 946         requested_server *this_server;
 947         requested_server *next_server;
 948
 949         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 950                 next_server=this_server->next;
 951                 free(this_server);
 952                 }
 953
 954         return OK;
 955         }
 956
 957
 958 /* gets state and plugin output to return */
 959 int get_results(void){
 960         dhcp_offer *temp_offer;
 961         requested_server *temp_server;
 962         int result;
 963         u_int32_t max_lease_time=0;
 964
 965         received_requested_address=FALSE;
 966
 967         /* checks responses from requested servers */
 968         requested_responses=0;
 969         if(requested_servers>0){
 970
 971                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 972
 973                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 974
 975                                 /* get max lease time we were offered */
 976                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 977                                         max_lease_time=temp_offer->lease_time;
 978
 979                                 /* see if we got the address we requested */
 980                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 981                                         received_requested_address=TRUE;
 982
 983                                 /* see if the servers we wanted a response from talked to us or not */
 984                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 985                                         if(verbose){
 986                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 987                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 988                                                 if(temp_server->answered)
 989                                                         printf(_(" (duplicate)"));
 990                                                 printf(_("\n"));
 991                                                 }
 992                                         if(temp_server->answered == FALSE){
 993                                                 requested_responses++;
 994                                                 temp_server->answered=TRUE;
 995                                                 }
 996                                         }
 997                                 }
 998                         }
 999
1000                 }
1001
1002         /* else check and see if we got our requested address from any server */
1003         else{
1004
1005                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
1006
1007                         /* get max lease time we were offered */
1008                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
1009                                 max_lease_time=temp_offer->lease_time;
1010
1011                         /* see if we got the address we requested */
1012                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
1013                                 received_requested_address=TRUE;
1014                         }
1015                 }
1016
1017         result=STATE_OK;
1018         if(valid_responses==0)
1019                 result=STATE_CRITICAL;
1020         else if(requested_servers>0 && requested_responses==0)
1021                 result=STATE_CRITICAL;
1022         else if(requested_responses<requested_servers)
1023                 result=STATE_WARNING;
1024         else if(request_specific_address==TRUE && received_requested_address==FALSE)
1025                 result=STATE_WARNING;
1026
1027         if(result==0)               /* garrett honeycutt 2005 */
1028                 printf("OK: ");
1029         else if(result==1)
1030                 printf("WARNING: ");
1031         else if(result==2)
1032                 printf("CRITICAL: ");
1033         else if(result==3)
1034                 printf("UNKNOWN: ");
1035
1036         /* we didn't receive any DHCPOFFERs */
1037         if(dhcp_offer_list==NULL){
1038                 printf(_("No DHCPOFFERs were received.\n"));
1039                 return result;
1040                 }
1041
1042         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
1043
1044         if(requested_servers>0)
1045                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
1046
1047         if(request_specific_address==TRUE)
1048                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
1049
1050         printf(_(", max lease time = "));
1051         if(max_lease_time==DHCP_INFINITE_TIME)
1052                 printf(_("Infinity"));
1053         else
1054                 printf("%lu sec",(unsigned long)max_lease_time);
1055
1056         printf(".\n");
1057
1058         return result;
1059         }
1060
1061
1062 /* process command-line arguments */
1063 int process_arguments(int argc, char **argv){
1064         int c;
1065
1066         if(argc<1)
1067                 return ERROR;
1068
1069         c=0;
1070         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1071
1072                 /*
1073                 if(is_option(argv[c]))
1074                         continue;
1075                 */
1076                 }
1077
1078         return validate_arguments();
1079         }
1080
1081
1082
1083 int call_getopt(int argc, char **argv){
1084         int c=0;
1085         int i=0;
1086
1087         int option_index = 0;
1088         static struct option long_options[] =
1089         {
1090                 {"serverip",       required_argument,0,'s'},
1091                 {"requestedip",    required_argument,0,'r'},
1092                 {"timeout",        required_argument,0,'t'},
1093                 {"interface",      required_argument,0,'i'},
1094                 {"mac",            required_argument,0,'m'},
1095                 {"unicast",        no_argument,      0,'u'},
1096                 {"verbose",        no_argument,      0,'v'},
1097                 {"version",        no_argument,      0,'V'},
1098                 {"help",           no_argument,      0,'h'},
1099                 {0,0,0,0}
1100         };
1101
1102         while(1){
1103                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
1104
1105                 i++;
1106
1107                 if(c==-1||c==EOF||c==1)
1108                         break;
1109
1110                 switch(c){
1111                 case 'w':
1112                 case 'r':
1113                 case 't':
1114                 case 'i':
1115                         i++;
1116                         break;
1117                 default:
1118                         break;
1119                         }
1120
1121                 switch(c){
1122
1123                 case 's': /* DHCP server address */
1124                         resolve_host(optarg,&dhcp_ip);
1125                         add_requested_server(dhcp_ip);
1126                         break;
1127
1128                 case 'r': /* address we are requested from DHCP servers */
1129                         resolve_host(optarg,&requested_address);
1130                         request_specific_address=TRUE;
1131                         break;
1132
1133                 case 't': /* timeout */
1134
1135                         /*
1136                         if(is_intnonneg(optarg))
1137                         */
1138                         if(atoi(optarg)>0)
1139                                 dhcpoffer_timeout=atoi(optarg);
1140                         /*
1141                         else
1142                                 usage("Time interval must be a nonnegative integer\n");
1143                         */
1144                         break;
1145
1146                 case 'm': /* MAC address */
1147
1148                         if((user_specified_mac=mac_aton(optarg)) == NULL)
1149                                 usage("Cannot parse MAC address.\n");
1150                         if(verbose)
1151                                 print_hardware_address(user_specified_mac);
1152
1153                         break;
1154
1155                 case 'i': /* interface name */
1156
1157                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1158                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1159
1160                         break;
1161
1162                 case 'u': /* unicast testing */
1163                         unicast=1;
1164                         break;
1165
1166                 case 'V': /* version */
1167                         print_revision(progname, NP_VERSION);
1168                         exit(STATE_OK);
1169
1170                 case 'h': /* help */
1171                         print_help();
1172                         exit(STATE_OK);
1173
1174                 case 'v': /* verbose */
1175                         verbose=1;
1176                         break;
1177
1178                 case '?': /* help */
1179                         usage5 ();
1180                         break;
1181
1182                 default:
1183                         break;
1184                         }
1185                 }
1186
1187         return i;
1188         }
1189
1190
1191 int validate_arguments(void){
1192
1193         return OK;
1194         }
1195
1196
1197 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1198 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1199
1200 /* get a message from a stream; return type of message */
1201 static int get_msg(int fd){
1202         int flags = 0;
1203         int res, ret;
1204         ctl_area[0] = 0;
1205         dat_area[0] = 0;
1206         ret = 0;
1207         res = getmsg(fd, &ctl, &dat, &flags);
1208
1209         if(res < 0){
1210                 if(errno == EINTR){
1211                         return(GOT_INTR);
1212                         }
1213                 else{
1214                         printf("%s\n", "get_msg FAILED.");
1215                         return(GOT_ERR);
1216                         }
1217                 }
1218         if(ctl.len > 0){
1219                 ret |= GOT_CTRL;
1220                 }
1221         if(dat.len > 0){
1222                 ret |= GOT_DATA;
1223                 }
1224
1225         return(ret);
1226         }
1227
1228 /* verify that dl_primitive in ctl_area = prim */
1229 static int check_ctrl(int prim){
1230         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1231
1232         if(err_ack->dl_primitive != prim){
1233                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1234                 exit(STATE_UNKNOWN);
1235                 }
1236
1237         return 0;
1238         }
1239
1240 /* put a control message on a stream */
1241 static int put_ctrl(int fd, int len, int pri){
1242
1243         ctl.len = len;
1244         if(putmsg(fd, &ctl, 0, pri) < 0){
1245                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1246                 exit(STATE_UNKNOWN);
1247                 }
1248
1249         return  0;
1250         }
1251
1252 /* put a control + data message on a stream */
1253 static int put_both(int fd, int clen, int dlen, int pri){
1254
1255         ctl.len = clen;
1256         dat.len = dlen;
1257         if(putmsg(fd, &ctl, &dat, pri) < 0){
1258                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1259                 exit(STATE_UNKNOWN);
1260                 }
1261
1262         return  0;
1263         }
1264
1265 /* open file descriptor and attach */
1266 static int dl_open(const char *dev, int unit, int *fd){
1267         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1268
1269         if((*fd = open(dev, O_RDWR)) == -1){
1270                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1271                 exit(STATE_UNKNOWN);
1272                 }
1273         attach_req->dl_primitive = DL_ATTACH_REQ;
1274         attach_req->dl_ppa = unit;
1275         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1276         get_msg(*fd);
1277         return check_ctrl(DL_OK_ACK);
1278         }
1279
1280 /* send DL_BIND_REQ */
1281 static int dl_bind(int fd, int sap, u_char *addr){
1282         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1283         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1284
1285         bind_req->dl_primitive = DL_BIND_REQ;
1286         bind_req->dl_sap = sap;
1287         bind_req->dl_max_conind = 1;
1288         bind_req->dl_service_mode = DL_CLDLS;
1289         bind_req->dl_conn_mgmt = 0;
1290         bind_req->dl_xidtest_flg = 0;
1291         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1292         get_msg(fd);
1293         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1294                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1295                 exit(STATE_UNKNOWN);
1296                 }
1297         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1298               bind_ack->dl_addr_length);
1299
1300         return 0;
1301         }
1302
1303 /***********************************************************************
1304  * interface:
1305  * function mac_addr_dlpi - get the mac address of the interface with
1306  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1307  *
1308  * parameter: addr: an array of six bytes, has to be allocated by the caller
1309  *
1310  * return: 0 if OK, -1 if the address could not be determined
1311  *
1312  *
1313  ***********************************************************************/
1314
1315 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1316         int fd;
1317         u_char mac_addr[25];
1318
1319         if(GOT_ERR != dl_open(dev, unit, &fd)){
1320                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1321                         bcopy( mac_addr, addr, 6);
1322                         return 0;
1323                         }
1324                 }
1325         close(fd);
1326
1327         return -1;
1328         }
1329
1330 /* Kompf 2000-2003 */
1331 #endif
1332
1333
1334 /* resolve host name or die (TODO: move this to netutils.c!) */
1335 void resolve_host(const char *in,struct in_addr *out){
1336         struct addrinfo hints, *ai;
1337
1338         memset(&hints,0,sizeof(hints));
1339         hints.ai_family=PF_INET;
1340         if (getaddrinfo(in,NULL,&hints,&ai) != 0)
1341                 usage_va(_("Invalid hostname/address - %s"),optarg);
1342
1343         memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out));
1344         freeaddrinfo(ai);
1345         }
1346
1347
1348 /* parse MAC address string, return 6 bytes (unterminated) or NULL */
1349 unsigned char *mac_aton(const char *string){
1350         static unsigned char result[6];
1351         char tmp[3];
1352         unsigned i, j;
1353
1354         for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
1355                 /* ignore ':' and any other non-hex character */
1356                 if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
1357                         continue;
1358                 tmp[0]=string[i];
1359                 tmp[1]=string[i+1];
1360                 tmp[2]='\0';
1361                 result[j]=strtol(tmp,(char **)NULL,16);
1362                 i++;
1363                 j++;
1364                 }
1365
1366         return (j==6) ? result : NULL;
1367         }
1368
1369
1370 void print_hardware_address(const unsigned char *address){
1371         int i;
1372
1373         printf(_("Hardware address: "));
1374         for (i=0; i<5; i++)
1375                 printf("%2.2x:", address[i]);
1376         printf("%2.2x", address[i]);
1377         putchar('\n');
1378         }
1379
1380
1381 /* print usage help */
1382 void print_help(void){
1383
1384         print_revision(progname, NP_VERSION);
1385
1386         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1387         printf (COPYRIGHT, copyright, email);
1388
1389         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1390
1391   printf ("\n\n");
1392
1393         print_usage();
1394
1395         printf (_(UT_HELP_VRSN));
1396         printf (_(UT_EXTRA_OPTS));
1397
1398         printf (_(UT_VERBOSE));
1399
1400         printf (" %s\n", "-s, --serverip=IPADDRESS");
1401   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1402   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1403   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1404   printf (" %s\n", "-t, --timeout=INTEGER");
1405   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1406   printf (" %s\n", "-i, --interface=STRING");
1407   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1408   printf (" %s\n", "-m, --mac=STRING");
1409   printf ("    %s\n", _("MAC address to use in the DHCP request"));
1410   printf (" %s\n", "-u, --unicast");
1411   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
1412
1413 #ifdef NP_EXTRA_OPTS
1414   printf ("\n");
1415   printf ("%s\n", _("Notes:"));
1416   printf (_(UT_EXTRA_OPTS_NOTES));
1417 #endif
1418
1419   printf (_(UT_SUPPORT));
1420         return;
1421         }
1422
1423
1424 void
1425 print_usage(void){
1426
1427   printf (_("Usage:"));
1428   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
1429   printf ("                  [-i interface] [-m mac]\n");
1430
1431         return;
1432         }
1433
1434
1435