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 * 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 * Unicast mode was originally implemented by Heiti of Boras Kommun with
  18 * general improvements as well as usability fixes and "forward"-porting by
  19 * Andreas Ericsson of OP5 AB.
  20 *
  21 *
  22 * This program is free software: you can redistribute it and/or modify
  23 * it under the terms of the GNU General Public License as published by
  24 * the Free Software Foundation, either version 3 of the License, or
  25 * (at your option) any later version.
  26 *
  27 * This program is distributed in the hope that it will be useful,
  28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30 * GNU General Public License for more details.
  31 *
  32 * You should have received a copy of the GNU General Public License
  33 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  34 *
  35 * $Id$
  36 *
  37 *****************************************************************************/
  38
  39 const char *progname = "check_dhcp";
  40 const char *revision = "$Revision$";
  41 const char *copyright = "2001-2007";
  42 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  43
  44 #include "common.h"
  45 #include "netutils.h"
  46 #include "utils.h"
  47
  48 #include <ctype.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <errno.h>
  53 #include <unistd.h>
  54 #include <sys/time.h>
  55 #include <sys/ioctl.h>
  56 #include <fcntl.h>
  57 #include <getopt.h>
  58 #include <sys/socket.h>
  59 #include <sys/types.h>
  60 #include <netdb.h>
  61 #include <netinet/in.h>
  62 #include <net/if.h>
  63 #include <arpa/inet.h>
  64 #if HAVE_SYS_SOCKIO_H
  65 #include <sys/sockio.h>
  66 #endif
  67
  68 #if defined( __linux__ )
  69
  70 #include <linux/if_ether.h>
  71 #include <features.h>
  72
  73 #elif defined (__bsd__)
  74
  75 #include <netinet/if_ether.h>
  76 #include <sys/param.h>
  77 #include <sys/sysctl.h>
  78 #include <net/if_dl.h>
  79
  80 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
  81
  82 #define INSAP 22
  83 #define OUTSAP 24
  84
  85 #include <signal.h>
  86 #include <ctype.h>
  87 #include <sys/stropts.h>
  88 #include <sys/poll.h>
  89 #include <sys/dlpi.h>
  90
  91 #define bcopy(source, destination, length) memcpy(destination, source, length)
  92
  93 #define AREA_SZ 5000            /* buffer length in bytes */
  94 static u_long ctl_area[AREA_SZ];
  95 static u_long dat_area[AREA_SZ];
  96 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
  97 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
  98
  99 #define GOT_CTRL 1
 100 #define GOT_DATA 2
 101 #define GOT_BOTH 3
 102 #define GOT_INTR 4
 103 #define GOT_ERR 128
 104
 105 #define u_int8_t         uint8_t
 106 #define u_int16_t       uint16_t
 107 #define u_int32_t       uint32_t
 108
 109 static int get_msg(int);
 110 static int check_ctrl(int);
 111 static int put_ctrl(int, int, int);
 112 static int put_both(int, int, int, int);
 113 static int dl_open(const char *, int, int *);
 114 static int dl_bind(int, int, u_char *);
 115 long mac_addr_dlpi( const char *, int, u_char *);
 116
 117 #endif
 118
 119
 120
 121 /**** Common definitions ****/
 122
 123 #define OK                0
 124 #define ERROR             -1
 125
 126 #define FALSE             0
 127 #define TRUE              1
 128
 129
 130 /**** DHCP definitions ****/
 131
 132 #define MAX_DHCP_CHADDR_LENGTH           16
 133 #define MAX_DHCP_SNAME_LENGTH            64
 134 #define MAX_DHCP_FILE_LENGTH             128
 135 #define MAX_DHCP_OPTIONS_LENGTH          312
 136
 137
 138 typedef struct dhcp_packet_struct{
 139         u_int8_t  op;                   /* packet type */
 140         u_int8_t  htype;                /* type of hardware address for this machine (Ethernet, etc) */
 141         u_int8_t  hlen;                 /* length of hardware address (of this machine) */
 142         u_int8_t  hops;                 /* hops */
 143         u_int32_t xid;                  /* random transaction id number - chosen by this machine */
 144         u_int16_t secs;                 /* seconds used in timing */
 145         u_int16_t flags;                /* flags */
 146         struct in_addr ciaddr;          /* IP address of this machine (if we already have one) */
 147         struct in_addr yiaddr;          /* IP address of this machine (offered by the DHCP server) */
 148         struct in_addr siaddr;          /* IP address of DHCP server */
 149         struct in_addr giaddr;          /* IP address of DHCP relay */
 150         unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH];      /* hardware address of this machine */
 151         char sname [MAX_DHCP_SNAME_LENGTH];    /* name of DHCP server */
 152         char file [MAX_DHCP_FILE_LENGTH];      /* boot file name (used for diskless booting?) */
 153         char options[MAX_DHCP_OPTIONS_LENGTH];  /* options */
 154         }dhcp_packet;
 155
 156
 157 typedef struct dhcp_offer_struct{
 158         struct in_addr server_address;   /* address of DHCP server that sent this offer */
 159         struct in_addr offered_address;  /* the IP address that was offered to us */
 160         u_int32_t lease_time;            /* lease time in seconds */
 161         u_int32_t renewal_time;          /* renewal time in seconds */
 162         u_int32_t rebinding_time;        /* rebinding time in seconds */
 163         struct dhcp_offer_struct *next;
 164         }dhcp_offer;
 165
 166
 167 typedef struct requested_server_struct{
 168         struct in_addr server_address;
 169         int answered;
 170         struct requested_server_struct *next;
 171         }requested_server;
 172
 173
 174 #define BOOTREQUEST     1
 175 #define BOOTREPLY       2
 176
 177 #define DHCPDISCOVER    1
 178 #define DHCPOFFER       2
 179 #define DHCPREQUEST     3
 180 #define DHCPDECLINE     4
 181 #define DHCPACK         5
 182 #define DHCPNACK        6
 183 #define DHCPRELEASE     7
 184
 185 #define DHCP_OPTION_MESSAGE_TYPE        53
 186 #define DHCP_OPTION_HOST_NAME           12
 187 #define DHCP_OPTION_BROADCAST_ADDRESS   28
 188 #define DHCP_OPTION_REQUESTED_ADDRESS   50
 189 #define DHCP_OPTION_LEASE_TIME          51
 190 #define DHCP_OPTION_SERVER_IDENTIFIER   54
 191 #define DHCP_OPTION_RENEWAL_TIME        58
 192 #define DHCP_OPTION_REBINDING_TIME      59
 193 #define DHCP_OPTION_END                 255
 194
 195 #define DHCP_INFINITE_TIME              0xFFFFFFFF
 196
 197 #define DHCP_BROADCAST_FLAG 32768
 198 #define DHCP_UNICAST_FLAG   0
 199
 200 #define DHCP_SERVER_PORT   67
 201 #define DHCP_CLIENT_PORT   68
 202
 203 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 204 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 205
 206 u_int8_t unicast = 0;        /* unicast mode: mimic a DHCP relay */
 207 struct in_addr my_ip;        /* our address (required for relay) */
 208 struct in_addr dhcp_ip;      /* server to query (if in unicast mode) */
 209 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 210 unsigned char *user_specified_mac=NULL;
 211
 212 char network_interface_name[IFNAMSIZ]="eth0";
 213
 214 u_int32_t packet_xid=0;
 215
 216 u_int32_t dhcp_lease_time=0;
 217 u_int32_t dhcp_renewal_time=0;
 218 u_int32_t dhcp_rebinding_time=0;
 219
 220 int dhcpoffer_timeout=2;
 221
 222 dhcp_offer *dhcp_offer_list=NULL;
 223 requested_server *requested_server_list=NULL;
 224
 225 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 226 int requested_servers=0;
 227 int requested_responses=0;
 228
 229 int request_specific_address=FALSE;
 230 int received_requested_address=FALSE;
 231 int verbose=0;
 232 struct in_addr requested_address;
 233
 234
 235 int process_arguments(int, char **);
 236 int call_getopt(int, char **);
 237 int validate_arguments(void);
 238 void print_usage(void);
 239 void print_help(void);
 240
 241 void resolve_host(const char *in,struct in_addr *out);
 242 unsigned char *mac_aton(const char *);
 243 void print_hardware_address(const unsigned char *);
 244 int get_hardware_address(int,char *);
 245 int get_ip_address(int,char *);
 246
 247 int send_dhcp_discover(int);
 248 int get_dhcp_offer(int);
 249
 250 int get_results(void);
 251
 252 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 253 int free_dhcp_offer_list(void);
 254 int free_requested_server_list(void);
 255
 256 int create_dhcp_socket(void);
 257 int close_dhcp_socket(int);
 258 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 259 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 260
 261
 262
 263 int main(int argc, char **argv){
 264         int dhcp_socket;
 265         int result = STATE_UNKNOWN;
 266
 267         setlocale (LC_ALL, "");
 268         bindtextdomain (PACKAGE, LOCALEDIR);
 269         textdomain (PACKAGE);
 270
 271         if(process_arguments(argc,argv)!=OK){
 272                 usage4 (_("Could not parse arguments"));
 273                 }
 274
 275         /* this plugin almost certainly needs root permissions. */
 276         np_warn_if_not_root();
 277
 278         /* create socket for DHCP communications */
 279         dhcp_socket=create_dhcp_socket();
 280
 281         /* get hardware address of client machine */
 282         if(user_specified_mac!=NULL)
 283                 memcpy(client_hardware_address,user_specified_mac,6);
 284         else
 285                 get_hardware_address(dhcp_socket,network_interface_name);
 286
 287         if(unicast) /* get IP address of client machine */
 288                 get_ip_address(dhcp_socket,network_interface_name);
 289
 290         /* send DHCPDISCOVER packet */
 291         send_dhcp_discover(dhcp_socket);
 292
 293         /* wait for a DHCPOFFER packet */
 294         get_dhcp_offer(dhcp_socket);
 295
 296         /* close socket we created */
 297         close_dhcp_socket(dhcp_socket);
 298
 299         /* determine state/plugin output to return */
 300         result=get_results();
 301
 302         /* free allocated memory */
 303         free_dhcp_offer_list();
 304         free_requested_server_list();
 305
 306         return result;
 307         }
 308
 309
 310
 311 /* determines hardware address on client machine */
 312 int get_hardware_address(int sock,char *interface_name){
 313
 314 #if defined(__linux__)
 315         struct ifreq ifr;
 316
 317         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 318         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 319
 320         /* try and grab hardware address of requested interface */
 321         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 322                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 323                 exit(STATE_UNKNOWN);
 324                 }
 325
 326         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 327
 328 #elif defined(__bsd__)
 329                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 330
 331         int                     mib[6], len;
 332         char                    *buf;
 333         unsigned char           *ptr;
 334         struct if_msghdr        *ifm;
 335         struct sockaddr_dl      *sdl;
 336
 337         mib[0] = CTL_NET;
 338         mib[1] = AF_ROUTE;
 339         mib[2] = 0;
 340         mib[3] = AF_LINK;
 341         mib[4] = NET_RT_IFLIST;
 342
 343         if((mib[5] = if_nametoindex(interface_name)) == 0){
 344                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 345                 exit(STATE_UNKNOWN);
 346                 }
 347
 348         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 349                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 350                 exit(STATE_UNKNOWN);
 351                 }
 352
 353         if((buf = malloc(len)) == NULL){
 354                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 355                 exit(4);
 356                 }
 357
 358         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 359                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 360                 exit(STATE_UNKNOWN);
 361                 }
 362
 363         ifm = (struct if_msghdr *)buf;
 364         sdl = (struct sockaddr_dl *)(ifm + 1);
 365         ptr = (unsigned char *)LLADDR(sdl);
 366         memcpy(&client_hardware_address[0], ptr, 6) ;
 367                                                 /* King 2004 */
 368
 369 #elif defined(__sun__) || defined(__solaris__)
 370
 371                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 372         long stat;
 373         char dev[20] = "/dev/";
 374         char *p;
 375         int unit;
 376
 377         for(p = interface_name; *p && isalpha(*p); p++)
 378                 /* no-op */ ;
 379         if( p != '\0' ){
 380                 unit = atoi(p) ;
 381                 *p = '\0' ;
 382                 strncat(dev, interface_name, 6) ;
 383                 }
 384         else{
 385                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 386                 exit(STATE_UNKNOWN);
 387                 }
 388         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 389         if(stat != 0){
 390                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 391                 exit(STATE_UNKNOWN);
 392                 }
 393
 394 #elif defined(__hpux__)
 395
 396         long stat;
 397         char dev[20] = "/dev/dlpi" ;
 398         int unit = 0;
 399
 400         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 401         if(stat != 0){
 402                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 403                 exit(STATE_UNKNOWN);
 404                 }
 405                                                 /* Kompf 2000-2003 */
 406
 407 #else
 408         printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
 409         exit(STATE_UNKNOWN);
 410 #endif
 411
 412         if(verbose)
 413                 print_hardware_address(client_hardware_address);
 414
 415         return OK;
 416         }
 417
 418 /* determines IP address of the client interface */
 419 int get_ip_address(int sock,char *interface_name){
 420 #if defined(SIOCGIFADDR)
 421         struct ifreq ifr;
 422
 423         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 424         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 425
 426         if(ioctl(sock,SIOCGIFADDR,&ifr)<0){
 427                 printf(_("Error: Cannot determine IP address of interface %s\n"),
 428                         interface_name);
 429                 exit(STATE_UNKNOWN);
 430                 }
 431
 432         my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
 433
 434 #else
 435         printf(_("Error: Cannot get interface IP address on this platform.\n"));
 436         exit(STATE_UNKNOWN);
 437 #endif
 438
 439         if(verbose)
 440                 printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip));
 441
 442         return OK;
 443         }
 444
 445 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 446 int send_dhcp_discover(int sock){
 447         dhcp_packet discover_packet;
 448         struct sockaddr_in sockaddr_broadcast;
 449     unsigned short opts;
 450
 451
 452         /* clear the packet data structure */
 453         bzero(&discover_packet,sizeof(discover_packet));
 454
 455
 456         /* boot request flag (backward compatible with BOOTP servers) */
 457         discover_packet.op=BOOTREQUEST;
 458
 459         /* hardware address type */
 460         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 461
 462         /* length of our hardware address */
 463         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 464
 465         /*
 466          * transaction ID is supposed to be random.  We won't use the address so
 467          * we don't care about high entropy here.  time(2) is good enough.
 468          */
 469         srand(time(NULL));
 470         packet_xid=random();
 471         discover_packet.xid=htonl(packet_xid);
 472
 473         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 474         /* downright bizzarre... */
 475         ntohl(discover_packet.xid);
 476
 477         /*discover_packet.secs=htons(65535);*/
 478         discover_packet.secs=0xFF;
 479
 480         /*
 481          * server needs to know if it should broadcast or unicast its response:
 482          * 0x8000L == 32768 == 1 << 15 == broadcast, 0 == unicast
 483          */
 484         discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG);
 485
 486         /* our hardware address */
 487         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 488
 489         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 490         discover_packet.options[0]='\x63';
 491         discover_packet.options[1]='\x82';
 492         discover_packet.options[2]='\x53';
 493         discover_packet.options[3]='\x63';
 494
 495     opts = 4;
 496         /* DHCP message type is embedded in options field */
 497         discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 498         discover_packet.options[opts++]='\x01';               /* DHCP message option length in bytes */
 499         discover_packet.options[opts++]=DHCPDISCOVER;
 500
 501         /* the IP address we're requesting */
 502         if(request_specific_address==TRUE){
 503                 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
 504                 discover_packet.options[opts++]='\x04';
 505                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
 506                 opts += sizeof(requested_address);
 507                 }
 508         discover_packet.options[opts++]=DHCP_OPTION_END;
 509
 510         /* unicast fields */
 511         if(unicast)
 512                 discover_packet.giaddr.s_addr = my_ip.s_addr;
 513
 514         /* see RFC 1542, 4.1.1 */
 515         discover_packet.hops = unicast ? 1 : 0;
 516
 517         /* send the DHCPDISCOVER packet to broadcast address */
 518         sockaddr_broadcast.sin_family=AF_INET;
 519         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 520         sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.s_addr : INADDR_BROADCAST;
 521         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 522
 523
 524         if(verbose){
 525                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 526                 printf("DHCPDISCOVER XID: %u (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 527                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 528                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 529                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 530                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 531                 }
 532
 533         /* send the DHCPDISCOVER packet out */
 534         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 535
 536         if(verbose)
 537                 printf("\n\n");
 538
 539         return OK;
 540         }
 541
 542
 543
 544
 545 /* waits for a DHCPOFFER message from one or more DHCP servers */
 546 int get_dhcp_offer(int sock){
 547         dhcp_packet offer_packet;
 548         struct sockaddr_in source;
 549         struct sockaddr_in via;
 550         int result=OK;
 551         int responses=0;
 552         int x;
 553         time_t start_time;
 554         time_t current_time;
 555
 556         time(&start_time);
 557
 558         /* receive as many responses as we can */
 559         for(responses=0,valid_responses=0;;){
 560
 561                 time(&current_time);
 562                 if((current_time-start_time)>=dhcpoffer_timeout)
 563                         break;
 564
 565                 if(verbose)
 566                         printf("\n\n");
 567
 568                 bzero(&source,sizeof(source));
 569                 bzero(&via,sizeof(via));
 570                 bzero(&offer_packet,sizeof(offer_packet));
 571
 572                 result=OK;
 573                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 574
 575                 if(result!=OK){
 576                         if(verbose)
 577                                 printf(_("Result=ERROR\n"));
 578
 579                         continue;
 580                         }
 581                 else{
 582                         if(verbose)
 583                                 printf(_("Result=OK\n"));
 584
 585                         responses++;
 586                         }
 587
 588                 /* The "source" is either a server or a relay. */
 589                 /* Save a copy of "source" into "via" even if it's via itself */
 590                 memcpy(&via,&source,sizeof(source)) ;
 591
 592                 /* If siaddr is non-zero, set "source" to siaddr */
 593                 if(offer_packet.siaddr.s_addr != 0L){
 594                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 595                         }
 596
 597                 if(verbose){
 598                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 599                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 600                         printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 601                         }
 602
 603                 /* check packet xid to see if its the same as the one we used in the discover packet */
 604                 if(ntohl(offer_packet.xid)!=packet_xid){
 605                         if(verbose)
 606                                 printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 607
 608                         continue;
 609                         }
 610
 611                 /* check hardware address */
 612                 result=OK;
 613                 if(verbose)
 614                         printf("DHCPOFFER chaddr: ");
 615
 616                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 617                         if(verbose)
 618                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 619
 620                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 621                                 result=ERROR;
 622                         }
 623                 if(verbose)
 624                         printf("\n");
 625
 626                 if(result==ERROR){
 627                         if(verbose)
 628                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 629
 630                         continue;
 631                         }
 632
 633                 if(verbose){
 634                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 635                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 636                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 637                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 638                         }
 639
 640                 add_dhcp_offer(source.sin_addr,&offer_packet);
 641
 642                 valid_responses++;
 643                 }
 644
 645         if(verbose){
 646                 printf(_("Total responses seen on the wire: %d\n"),responses);
 647                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 648                 }
 649
 650         return OK;
 651         }
 652
 653
 654
 655 /* sends a DHCP packet */
 656 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 657         int result;
 658
 659         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 660
 661         if(verbose)
 662                 printf(_("send_dhcp_packet result: %d\n"),result);
 663
 664         if(result<0)
 665                 return ERROR;
 666
 667         return OK;
 668         }
 669
 670
 671
 672 /* receives a DHCP packet */
 673 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 674         struct timeval tv;
 675         fd_set readfds;
 676         fd_set oobfds;
 677         int recv_result;
 678         socklen_t address_size;
 679         struct sockaddr_in source_address;
 680         int nfound;
 681
 682
 683         /* wait for data to arrive (up time timeout) */
 684         tv.tv_sec=timeout;
 685         tv.tv_usec=0;
 686         FD_ZERO(&readfds);
 687         FD_ZERO(&oobfds);
 688         FD_SET(sock,&readfds);
 689         FD_SET(sock,&oobfds);
 690         nfound = select(sock+1,&readfds,NULL,&oobfds,&tv);
 691
 692         /* make sure some data has arrived */
 693         if(!FD_ISSET(sock,&readfds)){
 694                 if(verbose)
 695                         printf(_("No (more) data received (nfound: %d)\n"), nfound);
 696                 return ERROR;
 697                 }
 698
 699         else{
 700
 701                 /* 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
 702                    not being interpreted correctly.  sigh... */
 703                 bzero(&source_address,sizeof(source_address));
 704                 address_size=sizeof(source_address);
 705                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 706                 if(verbose)
 707                         printf("recv_result_1: %d\n",recv_result);
 708                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 709                 if(verbose)
 710                         printf("recv_result_2: %d\n",recv_result);
 711
 712                 if(recv_result==-1){
 713                         if(verbose){
 714                                 printf(_("recvfrom() failed, "));
 715                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 716                                 }
 717                         return ERROR;
 718                         }
 719                 else{
 720                         if(verbose){
 721                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 722                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 723                                 }
 724
 725                         memcpy(address,&source_address,sizeof(source_address));
 726                         return OK;
 727                         }
 728                 }
 729
 730         return OK;
 731         }
 732
 733
 734 /* creates a socket for DHCP communication */
 735 int create_dhcp_socket(void){
 736         struct sockaddr_in myname;
 737         struct ifreq interface;
 738         int sock;
 739         int flag=1;
 740
 741         /* Set up the address we're going to bind to. */
 742         bzero(&myname,sizeof(myname));
 743         myname.sin_family=AF_INET;
 744         /* listen to DHCP server port if we're in unicast mode */
 745         myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT);
 746         myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY;
 747         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 748
 749         /* create a socket for DHCP communications */
 750         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 751         if(sock<0){
 752                 printf(_("Error: Could not create socket!\n"));
 753                 exit(STATE_UNKNOWN);
 754                 }
 755
 756         if(verbose)
 757                 printf("DHCP socket: %d\n",sock);
 758
 759         /* set the reuse address flag so we don't get errors when restarting */
 760         flag=1;
 761         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 762                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 763                 exit(STATE_UNKNOWN);
 764                 }
 765
 766         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 767         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 768                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 769                 exit(STATE_UNKNOWN);
 770                 }
 771
 772         /* bind socket to interface */
 773 #if defined(__linux__)
 774         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ-1);
 775         interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
 776         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 777                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 778                 exit(STATE_UNKNOWN);
 779                 }
 780
 781 #else
 782         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ-1);
 783         interface.ifr_name[IFNAMSIZ-1]='\0';
 784 #endif
 785
 786         /* bind the socket */
 787         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 788                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 789                 exit(STATE_UNKNOWN);
 790                 }
 791
 792         return sock;
 793         }
 794
 795
 796 /* closes DHCP socket */
 797 int close_dhcp_socket(int sock){
 798
 799         close(sock);
 800
 801         return OK;
 802         }
 803
 804
 805 /* adds a requested server address to list in memory */
 806 int add_requested_server(struct in_addr server_address){
 807         requested_server *new_server;
 808
 809         new_server=(requested_server *)malloc(sizeof(requested_server));
 810         if(new_server==NULL)
 811                 return ERROR;
 812
 813         new_server->server_address=server_address;
 814         new_server->answered=FALSE;
 815
 816         new_server->next=requested_server_list;
 817         requested_server_list=new_server;
 818
 819         requested_servers++;
 820
 821         if(verbose)
 822                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 823
 824         return OK;
 825         }
 826
 827
 828
 829
 830 /* adds a DHCP OFFER to list in memory */
 831 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 832         dhcp_offer *new_offer;
 833         int x;
 834         unsigned option_type;
 835         unsigned option_length;
 836         struct in_addr serv_ident = {0};
 837
 838         if(offer_packet==NULL)
 839                 return ERROR;
 840
 841         /* process all DHCP options present in the packet */
 842         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 843
 844                 /* end of options (0 is really just a pad, but bail out anyway) */
 845                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 846                         break;
 847
 848                 /* get option type */
 849                 option_type=offer_packet->options[x++];
 850
 851                 /* get option length */
 852                 option_length=offer_packet->options[x++];
 853
 854                 if(verbose)
 855                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 856
 857                 /* get option data */
 858                 switch(option_type){
 859                 case DHCP_OPTION_LEASE_TIME:
 860                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 861                         dhcp_lease_time = ntohl(dhcp_lease_time);
 862                         break;
 863                 case DHCP_OPTION_RENEWAL_TIME:
 864                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 865                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 866                         break;
 867                 case DHCP_OPTION_REBINDING_TIME:
 868                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 869                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 870                         break;
 871                 case DHCP_OPTION_SERVER_IDENTIFIER:
 872                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 873                         break;
 874                         }
 875
 876                 /* skip option data we're ignoring */
 877                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 878                         x+=option_length;
 879                 }
 880
 881         if(verbose){
 882                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 883                         printf(_("Lease Time: Infinite\n"));
 884                 else
 885                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 886                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 887                         printf(_("Renewal Time: Infinite\n"));
 888                 else
 889                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 890                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 891                         printf(_("Rebinding Time: Infinite\n"));
 892                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 893                 }
 894
 895         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 896
 897         if(new_offer==NULL)
 898                 return ERROR;
 899
 900         /*
 901          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 902          * 'siaddr' field as the address of the server to use in the next step
 903          * of the client's bootstrap process.  A DHCP server may return its own
 904          * address in the 'siaddr' field, if the server is prepared to supply
 905          * the next bootstrap service (e.g., delivery of an operating system
 906          * executable image).  A DHCP server always returns its own address in
 907          * the 'server identifier' option."  'serv_ident' is the 'server
 908          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 909          * wasn't available) the IP address we received the DHCPOFFER from.  If
 910          * 'serv_ident' isn't available for some reason, we use 'source'.
 911          */
 912         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 913         new_offer->offered_address=offer_packet->yiaddr;
 914         new_offer->lease_time=dhcp_lease_time;
 915         new_offer->renewal_time=dhcp_renewal_time;
 916         new_offer->rebinding_time=dhcp_rebinding_time;
 917
 918
 919         if(verbose){
 920                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 921                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 922                 }
 923
 924         /* add new offer to head of list */
 925         new_offer->next=dhcp_offer_list;
 926         dhcp_offer_list=new_offer;
 927
 928         return OK;
 929         }
 930
 931
 932 /* frees memory allocated to DHCP OFFER list */
 933 int free_dhcp_offer_list(void){
 934         dhcp_offer *this_offer;
 935         dhcp_offer *next_offer;
 936
 937         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 938                 next_offer=this_offer->next;
 939                 free(this_offer);
 940                 }
 941
 942         return OK;
 943         }
 944
 945
 946 /* frees memory allocated to requested server list */
 947 int free_requested_server_list(void){
 948         requested_server *this_server;
 949         requested_server *next_server;
 950
 951         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 952                 next_server=this_server->next;
 953                 free(this_server);
 954                 }
 955
 956         return OK;
 957         }
 958
 959
 960 /* gets state and plugin output to return */
 961 int get_results(void){
 962         dhcp_offer *temp_offer;
 963         requested_server *temp_server;
 964         int result;
 965         u_int32_t max_lease_time=0;
 966
 967         received_requested_address=FALSE;
 968
 969         /* checks responses from requested servers */
 970         requested_responses=0;
 971         if(requested_servers>0){
 972
 973                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 974
 975                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 976
 977                                 /* get max lease time we were offered */
 978                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 979                                         max_lease_time=temp_offer->lease_time;
 980
 981                                 /* see if we got the address we requested */
 982                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 983                                         received_requested_address=TRUE;
 984
 985                                 /* see if the servers we wanted a response from talked to us or not */
 986                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 987                                         if(verbose){
 988                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 989                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 990                                                 if(temp_server->answered)
 991                                                         printf(_(" (duplicate)"));
 992                                                 printf(_("\n"));
 993                                                 }
 994                                         if(temp_server->answered == FALSE){
 995                                                 requested_responses++;
 996                                                 temp_server->answered=TRUE;
 997                                                 }
 998                                         }
 999                                 }
1000                         }
1001
1002                 }
1003
1004         /* else check and see if we got our requested address from any server */
1005         else{
1006
1007                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
1008
1009                         /* get max lease time we were offered */
1010                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
1011                                 max_lease_time=temp_offer->lease_time;
1012
1013                         /* see if we got the address we requested */
1014                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
1015                                 received_requested_address=TRUE;
1016                         }
1017                 }
1018
1019         result=STATE_OK;
1020         if(valid_responses==0)
1021                 result=STATE_CRITICAL;
1022         else if(requested_servers>0 && requested_responses==0)
1023                 result=STATE_CRITICAL;
1024         else if(requested_responses<requested_servers)
1025                 result=STATE_WARNING;
1026         else if(request_specific_address==TRUE && received_requested_address==FALSE)
1027                 result=STATE_WARNING;
1028
1029         if(result==0)               /* garrett honeycutt 2005 */
1030                 printf("OK: ");
1031         else if(result==1)
1032                 printf("WARNING: ");
1033         else if(result==2)
1034                 printf("CRITICAL: ");
1035         else if(result==3)
1036                 printf("UNKNOWN: ");
1037
1038         /* we didn't receive any DHCPOFFERs */
1039         if(dhcp_offer_list==NULL){
1040                 printf(_("No DHCPOFFERs were received.\n"));
1041                 return result;
1042                 }
1043
1044         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
1045
1046         if(requested_servers>0)
1047                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
1048
1049         if(request_specific_address==TRUE)
1050                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
1051
1052         printf(_(", max lease time = "));
1053         if(max_lease_time==DHCP_INFINITE_TIME)
1054                 printf(_("Infinity"));
1055         else
1056                 printf("%lu sec",(unsigned long)max_lease_time);
1057
1058         printf(".\n");
1059
1060         return result;
1061         }
1062
1063
1064 /* process command-line arguments */
1065 int process_arguments(int argc, char **argv){
1066         int c;
1067
1068         if(argc<1)
1069                 return ERROR;
1070
1071         c=0;
1072         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1073
1074                 /*
1075                 if(is_option(argv[c]))
1076                         continue;
1077                 */
1078                 }
1079
1080         return validate_arguments();
1081         }
1082
1083
1084
1085 int call_getopt(int argc, char **argv){
1086         int c=0;
1087         int i=0;
1088
1089         int option_index = 0;
1090         static struct option long_options[] =
1091         {
1092                 {"serverip",       required_argument,0,'s'},
1093                 {"requestedip",    required_argument,0,'r'},
1094                 {"timeout",        required_argument,0,'t'},
1095                 {"interface",      required_argument,0,'i'},
1096                 {"mac",            required_argument,0,'m'},
1097                 {"unicast",        no_argument,      0,'u'},
1098                 {"verbose",        no_argument,      0,'v'},
1099                 {"version",        no_argument,      0,'V'},
1100                 {"help",           no_argument,      0,'h'},
1101                 {0,0,0,0}
1102         };
1103
1104         while(1){
1105                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
1106
1107                 i++;
1108
1109                 if(c==-1||c==EOF||c==1)
1110                         break;
1111
1112                 switch(c){
1113                 case 'w':
1114                 case 'r':
1115                 case 't':
1116                 case 'i':
1117                         i++;
1118                         break;
1119                 default:
1120                         break;
1121                         }
1122
1123                 switch(c){
1124
1125                 case 's': /* DHCP server address */
1126                         resolve_host(optarg,&dhcp_ip);
1127                         add_requested_server(dhcp_ip);
1128                         break;
1129
1130                 case 'r': /* address we are requested from DHCP servers */
1131                         resolve_host(optarg,&requested_address);
1132                         request_specific_address=TRUE;
1133                         break;
1134
1135                 case 't': /* timeout */
1136
1137                         /*
1138                         if(is_intnonneg(optarg))
1139                         */
1140                         if(atoi(optarg)>0)
1141                                 dhcpoffer_timeout=atoi(optarg);
1142                         /*
1143                         else
1144                                 usage("Time interval must be a nonnegative integer\n");
1145                         */
1146                         break;
1147
1148                 case 'm': /* MAC address */
1149
1150                         if((user_specified_mac=mac_aton(optarg)) == NULL)
1151                                 usage("Cannot parse MAC address.\n");
1152                         if(verbose)
1153                                 print_hardware_address(user_specified_mac);
1154
1155                         break;
1156
1157                 case 'i': /* interface name */
1158
1159                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1160                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1161
1162                         break;
1163
1164                 case 'u': /* unicast testing */
1165                         unicast=1;
1166                         break;
1167
1168                 case 'V': /* version */
1169                         print_revision(progname,revision);
1170                         exit(STATE_OK);
1171
1172                 case 'h': /* help */
1173                         print_help();
1174                         exit(STATE_OK);
1175
1176                 case 'v': /* verbose */
1177                         verbose=1;
1178                         break;
1179
1180                 case '?': /* help */
1181                         usage5 ();
1182                         break;
1183
1184                 default:
1185                         break;
1186                         }
1187                 }
1188
1189         return i;
1190         }
1191
1192
1193 int validate_arguments(void){
1194
1195         return OK;
1196         }
1197
1198
1199 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1200 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1201
1202 /* get a message from a stream; return type of message */
1203 static int get_msg(int fd){
1204         int flags = 0;
1205         int res, ret;
1206         ctl_area[0] = 0;
1207         dat_area[0] = 0;
1208         ret = 0;
1209         res = getmsg(fd, &ctl, &dat, &flags);
1210
1211         if(res < 0){
1212                 if(errno == EINTR){
1213                         return(GOT_INTR);
1214                         }
1215                 else{
1216                         printf("%s\n", "get_msg FAILED.");
1217                         return(GOT_ERR);
1218                         }
1219                 }
1220         if(ctl.len > 0){
1221                 ret |= GOT_CTRL;
1222                 }
1223         if(dat.len > 0){
1224                 ret |= GOT_DATA;
1225                 }
1226
1227         return(ret);
1228         }
1229
1230 /* verify that dl_primitive in ctl_area = prim */
1231 static int check_ctrl(int prim){
1232         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1233
1234         if(err_ack->dl_primitive != prim){
1235                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1236                 exit(STATE_UNKNOWN);
1237                 }
1238
1239         return 0;
1240         }
1241
1242 /* put a control message on a stream */
1243 static int put_ctrl(int fd, int len, int pri){
1244
1245         ctl.len = len;
1246         if(putmsg(fd, &ctl, 0, pri) < 0){
1247                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1248                 exit(STATE_UNKNOWN);
1249                 }
1250
1251         return  0;
1252         }
1253
1254 /* put a control + data message on a stream */
1255 static int put_both(int fd, int clen, int dlen, int pri){
1256
1257         ctl.len = clen;
1258         dat.len = dlen;
1259         if(putmsg(fd, &ctl, &dat, pri) < 0){
1260                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1261                 exit(STATE_UNKNOWN);
1262                 }
1263
1264         return  0;
1265         }
1266
1267 /* open file descriptor and attach */
1268 static int dl_open(const char *dev, int unit, int *fd){
1269         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1270
1271         if((*fd = open(dev, O_RDWR)) == -1){
1272                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1273                 exit(STATE_UNKNOWN);
1274                 }
1275         attach_req->dl_primitive = DL_ATTACH_REQ;
1276         attach_req->dl_ppa = unit;
1277         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1278         get_msg(*fd);
1279         return check_ctrl(DL_OK_ACK);
1280         }
1281
1282 /* send DL_BIND_REQ */
1283 static int dl_bind(int fd, int sap, u_char *addr){
1284         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1285         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1286
1287         bind_req->dl_primitive = DL_BIND_REQ;
1288         bind_req->dl_sap = sap;
1289         bind_req->dl_max_conind = 1;
1290         bind_req->dl_service_mode = DL_CLDLS;
1291         bind_req->dl_conn_mgmt = 0;
1292         bind_req->dl_xidtest_flg = 0;
1293         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1294         get_msg(fd);
1295         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1296                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1297                 exit(STATE_UNKNOWN);
1298                 }
1299         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1300               bind_ack->dl_addr_length);
1301
1302         return 0;
1303         }
1304
1305 /***********************************************************************
1306  * interface:
1307  * function mac_addr_dlpi - get the mac address of the interface with
1308  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1309  *
1310  * parameter: addr: an array of six bytes, has to be allocated by the caller
1311  *
1312  * return: 0 if OK, -1 if the address could not be determined
1313  *
1314  *
1315  ***********************************************************************/
1316
1317 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1318         int fd;
1319         u_char mac_addr[25];
1320
1321         if(GOT_ERR != dl_open(dev, unit, &fd)){
1322                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1323                         bcopy( mac_addr, addr, 6);
1324                         return 0;
1325                         }
1326                 }
1327         close(fd);
1328
1329         return -1;
1330         }
1331
1332 /* Kompf 2000-2003 */
1333 #endif
1334
1335
1336 /* resolve host name or die (TODO: move this to netutils.c!) */
1337 void resolve_host(const char *in,struct in_addr *out){
1338         struct addrinfo hints, *ai;
1339
1340         memset(&hints,0,sizeof(hints));
1341         hints.ai_family=PF_INET;
1342         if (getaddrinfo(in,NULL,&hints,&ai) != 0)
1343                 usage_va(_("Invalid hostname/address - %s"),optarg);
1344
1345         memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out));
1346         freeaddrinfo(ai);
1347         }
1348
1349
1350 /* parse MAC address string, return 6 bytes (unterminated) or NULL */
1351 unsigned char *mac_aton(const char *string){
1352         static unsigned char result[6];
1353         char tmp[3];
1354         unsigned i, j;
1355
1356         for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
1357                 /* ignore ':' and any other non-hex character */
1358                 if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
1359                         continue;
1360                 tmp[0]=string[i];
1361                 tmp[1]=string[i+1];
1362                 tmp[2]='\0';
1363                 result[j]=strtol(tmp,(char **)NULL,16);
1364                 i++;
1365                 j++;
1366                 }
1367
1368         return (j==6) ? result : NULL;
1369         }
1370
1371
1372 void print_hardware_address(const unsigned char *address){
1373         int i;
1374
1375         printf(_("Hardware address: "));
1376         for (i=0; i<5; i++)
1377                 printf("%2.2x:", address[i]);
1378         printf("%2.2x", address[i]);
1379         putchar('\n');
1380         }
1381
1382
1383 /* print usage help */
1384 void print_help(void){
1385
1386         print_revision(progname,revision);
1387
1388         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1389         printf (COPYRIGHT, copyright, email);
1390
1391         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1392
1393   printf ("\n\n");
1394
1395         print_usage();
1396
1397         printf (_(UT_HELP_VRSN));
1398
1399         printf (_(UT_VERBOSE));
1400
1401         printf (" %s\n", "-s, --serverip=IPADDRESS");
1402   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1403   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1404   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1405   printf (" %s\n", "-t, --timeout=INTEGER");
1406   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1407   printf (" %s\n", "-i, --interface=STRING");
1408   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1409   printf (" %s\n", "-m, --mac=STRING");
1410   printf ("    %s\n", _("MAC address to use in the DHCP request"));
1411   printf (" %s\n", "-u, --unicast");
1412   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
1413
1414   printf (_(UT_SUPPORT));
1415         return;
1416         }
1417
1418
1419 void
1420 print_usage(void){
1421
1422   printf (_("Usage:"));
1423   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
1424   printf ("                  [-i interface] [-m mac]\n");
1425
1426         return;
1427         }
1428
1429
1430