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
 199 #define DHCP_SERVER_PORT   67
 200 #define DHCP_CLIENT_PORT   68
 201
 202 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 203 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 204
 205 u_int8_t unicast = 0;        /* unicast mode: mimic a DHCP relay */
 206 struct in_addr my_ip;        /* our address (required for relay) */
 207 struct in_addr dhcp_ip;      /* server to query (if in unicast mode) */
 208 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 209 unsigned char *user_specified_mac=NULL;
 210
 211 char network_interface_name[IFNAMSIZ]="eth0";
 212
 213 u_int32_t packet_xid=0;
 214
 215 u_int32_t dhcp_lease_time=0;
 216 u_int32_t dhcp_renewal_time=0;
 217 u_int32_t dhcp_rebinding_time=0;
 218
 219 int dhcpoffer_timeout=2;
 220
 221 dhcp_offer *dhcp_offer_list=NULL;
 222 requested_server *requested_server_list=NULL;
 223
 224 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 225 int requested_servers=0;
 226 int requested_responses=0;
 227
 228 int request_specific_address=FALSE;
 229 int received_requested_address=FALSE;
 230 int verbose=0;
 231 struct in_addr requested_address;
 232
 233
 234 int process_arguments(int, char **);
 235 int call_getopt(int, char **);
 236 int validate_arguments(void);
 237 void print_usage(void);
 238 void print_help(void);
 239
 240 void resolve_host(const char *in,struct in_addr *out);
 241 unsigned char *mac_aton(const char *);
 242 void print_hardware_address(const unsigned char *);
 243 int get_hardware_address(int,char *);
 244 int get_ip_address(int,char *);
 245
 246 int send_dhcp_discover(int);
 247 int get_dhcp_offer(int);
 248
 249 int get_results(void);
 250
 251 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 252 int free_dhcp_offer_list(void);
 253 int free_requested_server_list(void);
 254
 255 int create_dhcp_socket(void);
 256 int close_dhcp_socket(int);
 257 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 258 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 259
 260
 261
 262 int main(int argc, char **argv){
 263         int dhcp_socket;
 264         int result = STATE_UNKNOWN;
 265
 266         setlocale (LC_ALL, "");
 267         bindtextdomain (PACKAGE, LOCALEDIR);
 268         textdomain (PACKAGE);
 269
 270         /* Parse extra opts if any */
 271         argv=np_extra_opts(&argc, argv, progname);
 272
 273         if(process_arguments(argc,argv)!=OK){
 274                 usage4 (_("Could not parse arguments"));
 275                 }
 276
 277         /* this plugin almost certainly needs root permissions. */
 278         np_warn_if_not_root();
 279
 280         /* create socket for DHCP communications */
 281         dhcp_socket=create_dhcp_socket();
 282
 283         /* get hardware address of client machine */
 284         if(user_specified_mac!=NULL)
 285                 memcpy(client_hardware_address,user_specified_mac,6);
 286         else
 287                 get_hardware_address(dhcp_socket,network_interface_name);
 288
 289         if(unicast) /* get IP address of client machine */
 290                 get_ip_address(dhcp_socket,network_interface_name);
 291
 292         /* send DHCPDISCOVER packet */
 293         send_dhcp_discover(dhcp_socket);
 294
 295         /* wait for a DHCPOFFER packet */
 296         get_dhcp_offer(dhcp_socket);
 297
 298         /* close socket we created */
 299         close_dhcp_socket(dhcp_socket);
 300
 301         /* determine state/plugin output to return */
 302         result=get_results();
 303
 304         /* free allocated memory */
 305         free_dhcp_offer_list();
 306         free_requested_server_list();
 307
 308         return result;
 309         }
 310
 311
 312
 313 /* determines hardware address on client machine */
 314 int get_hardware_address(int sock,char *interface_name){
 315
 316 #if defined(__linux__)
 317         struct ifreq ifr;
 318
 319         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 320         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 321
 322         /* try and grab hardware address of requested interface */
 323         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 324                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 325                 exit(STATE_UNKNOWN);
 326                 }
 327
 328         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 329
 330 #elif defined(__bsd__)
 331                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 332
 333         int                     mib[6], len;
 334         char                    *buf;
 335         unsigned char           *ptr;
 336         struct if_msghdr        *ifm;
 337         struct sockaddr_dl      *sdl;
 338
 339         mib[0] = CTL_NET;
 340         mib[1] = AF_ROUTE;
 341         mib[2] = 0;
 342         mib[3] = AF_LINK;
 343         mib[4] = NET_RT_IFLIST;
 344
 345         if((mib[5] = if_nametoindex(interface_name)) == 0){
 346                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 347                 exit(STATE_UNKNOWN);
 348                 }
 349
 350         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 351                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 352                 exit(STATE_UNKNOWN);
 353                 }
 354
 355         if((buf = malloc(len)) == NULL){
 356                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 357                 exit(4);
 358                 }
 359
 360         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 361                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 362                 exit(STATE_UNKNOWN);
 363                 }
 364
 365         ifm = (struct if_msghdr *)buf;
 366         sdl = (struct sockaddr_dl *)(ifm + 1);
 367         ptr = (unsigned char *)LLADDR(sdl);
 368         memcpy(&client_hardware_address[0], ptr, 6) ;
 369                                                 /* King 2004 */
 370
 371 #elif defined(__sun__) || defined(__solaris__)
 372
 373                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 374         long stat;
 375         char dev[20] = "/dev/";
 376         char *p;
 377         int unit;
 378
 379         for(p = interface_name; *p && isalpha(*p); p++)
 380                 /* no-op */ ;
 381         if( p != '\0' ){
 382                 unit = atoi(p) ;
 383                 *p = '\0' ;
 384                 strncat(dev, interface_name, 6) ;
 385                 }
 386         else{
 387                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 388                 exit(STATE_UNKNOWN);
 389                 }
 390         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 391         if(stat != 0){
 392                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 393                 exit(STATE_UNKNOWN);
 394                 }
 395
 396 #elif defined(__hpux__)
 397
 398         long stat;
 399         char dev[20] = "/dev/dlpi" ;
 400         int unit = 0;
 401
 402         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 403         if(stat != 0){
 404                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 405                 exit(STATE_UNKNOWN);
 406                 }
 407                                                 /* Kompf 2000-2003 */
 408
 409 #else
 410         printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
 411         exit(STATE_UNKNOWN);
 412 #endif
 413
 414         if(verbose)
 415                 print_hardware_address(client_hardware_address);
 416
 417         return OK;
 418         }
 419
 420 /* determines IP address of the client interface */
 421 int get_ip_address(int sock,char *interface_name){
 422 #if defined(SIOCGIFADDR)
 423         struct ifreq ifr;
 424
 425         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 426         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 427
 428         if(ioctl(sock,SIOCGIFADDR,&ifr)<0){
 429                 printf(_("Error: Cannot determine IP address of interface %s\n"),
 430                         interface_name);
 431                 exit(STATE_UNKNOWN);
 432                 }
 433
 434         my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
 435
 436 #else
 437         printf(_("Error: Cannot get interface IP address on this platform.\n"));
 438         exit(STATE_UNKNOWN);
 439 #endif
 440
 441         if(verbose)
 442                 printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip));
 443
 444         return OK;
 445         }
 446
 447 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 448 int send_dhcp_discover(int sock){
 449         dhcp_packet discover_packet;
 450         struct sockaddr_in sockaddr_broadcast;
 451     unsigned short opts;
 452
 453
 454         /* clear the packet data structure */
 455         bzero(&discover_packet,sizeof(discover_packet));
 456
 457
 458         /* boot request flag (backward compatible with BOOTP servers) */
 459         discover_packet.op=BOOTREQUEST;
 460
 461         /* hardware address type */
 462         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 463
 464         /* length of our hardware address */
 465         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 466
 467         /*
 468          * transaction ID is supposed to be random.  We won't use the address so
 469          * we don't care about high entropy here.  time(2) is good enough.
 470          */
 471         srand(time(NULL));
 472         packet_xid=random();
 473         discover_packet.xid=htonl(packet_xid);
 474
 475         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 476         /* downright bizzarre... */
 477         ntohl(discover_packet.xid);
 478
 479         /*discover_packet.secs=htons(65535);*/
 480         discover_packet.secs=0xFF;
 481
 482         /*
 483          * server needs to know if it should broadcast or unicast its response:
 484          * 0x8000L == 32768 == 1 << 15 == broadcast, 0 == unicast
 485          */
 486         discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG);
 487
 488         /* our hardware address */
 489         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 490
 491         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 492         discover_packet.options[0]='\x63';
 493         discover_packet.options[1]='\x82';
 494         discover_packet.options[2]='\x53';
 495         discover_packet.options[3]='\x63';
 496
 497     opts = 4;
 498         /* DHCP message type is embedded in options field */
 499         discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 500         discover_packet.options[opts++]='\x01';               /* DHCP message option length in bytes */
 501         discover_packet.options[opts++]=DHCPDISCOVER;
 502
 503         /* the IP address we're requesting */
 504         if(request_specific_address==TRUE){
 505                 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
 506                 discover_packet.options[opts++]='\x04';
 507                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
 508                 opts += sizeof(requested_address);
 509                 }
 510         discover_packet.options[opts++]=DHCP_OPTION_END;
 511
 512         /* unicast fields */
 513         if(unicast)
 514                 discover_packet.giaddr.s_addr = my_ip.s_addr;
 515
 516         /* see RFC 1542, 4.1.1 */
 517         discover_packet.hops = unicast ? 1 : 0;
 518
 519         /* send the DHCPDISCOVER packet to broadcast address */
 520         sockaddr_broadcast.sin_family=AF_INET;
 521         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 522         sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.s_addr : INADDR_BROADCAST;
 523         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 524
 525
 526         if(verbose){
 527                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 528                 printf("DHCPDISCOVER XID: %u (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 529                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 530                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 531                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 532                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 533                 }
 534
 535         /* send the DHCPDISCOVER packet out */
 536         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 537
 538         if(verbose)
 539                 printf("\n\n");
 540
 541         return OK;
 542         }
 543
 544
 545
 546
 547 /* waits for a DHCPOFFER message from one or more DHCP servers */
 548 int get_dhcp_offer(int sock){
 549         dhcp_packet offer_packet;
 550         struct sockaddr_in source;
 551         struct sockaddr_in via;
 552         int result=OK;
 553         int responses=0;
 554         int x;
 555         time_t start_time;
 556         time_t current_time;
 557
 558         time(&start_time);
 559
 560         /* receive as many responses as we can */
 561         for(responses=0,valid_responses=0;;){
 562
 563                 time(&current_time);
 564                 if((current_time-start_time)>=dhcpoffer_timeout)
 565                         break;
 566
 567                 if(verbose)
 568                         printf("\n\n");
 569
 570                 bzero(&source,sizeof(source));
 571                 bzero(&via,sizeof(via));
 572                 bzero(&offer_packet,sizeof(offer_packet));
 573
 574                 result=OK;
 575                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 576
 577                 if(result!=OK){
 578                         if(verbose)
 579                                 printf(_("Result=ERROR\n"));
 580
 581                         continue;
 582                         }
 583                 else{
 584                         if(verbose)
 585                                 printf(_("Result=OK\n"));
 586
 587                         responses++;
 588                         }
 589
 590                 /* The "source" is either a server or a relay. */
 591                 /* Save a copy of "source" into "via" even if it's via itself */
 592                 memcpy(&via,&source,sizeof(source)) ;
 593
 594                 /* If siaddr is non-zero, set "source" to siaddr */
 595                 if(offer_packet.siaddr.s_addr != 0L){
 596                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 597                         }
 598
 599                 if(verbose){
 600                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 601                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 602                         printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 603                         }
 604
 605                 /* check packet xid to see if its the same as the one we used in the discover packet */
 606                 if(ntohl(offer_packet.xid)!=packet_xid){
 607                         if(verbose)
 608                                 printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 609
 610                         continue;
 611                         }
 612
 613                 /* check hardware address */
 614                 result=OK;
 615                 if(verbose)
 616                         printf("DHCPOFFER chaddr: ");
 617
 618                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 619                         if(verbose)
 620                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 621
 622                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 623                                 result=ERROR;
 624                         }
 625                 if(verbose)
 626                         printf("\n");
 627
 628                 if(result==ERROR){
 629                         if(verbose)
 630                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 631
 632                         continue;
 633                         }
 634
 635                 if(verbose){
 636                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 637                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 638                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 639                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 640                         }
 641
 642                 add_dhcp_offer(source.sin_addr,&offer_packet);
 643
 644                 valid_responses++;
 645                 }
 646
 647         if(verbose){
 648                 printf(_("Total responses seen on the wire: %d\n"),responses);
 649                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 650                 }
 651
 652         return OK;
 653         }
 654
 655
 656
 657 /* sends a DHCP packet */
 658 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 659         int result;
 660
 661         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 662
 663         if(verbose)
 664                 printf(_("send_dhcp_packet result: %d\n"),result);
 665
 666         if(result<0)
 667                 return ERROR;
 668
 669         return OK;
 670         }
 671
 672
 673
 674 /* receives a DHCP packet */
 675 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 676         struct timeval tv;
 677         fd_set readfds;
 678         fd_set oobfds;
 679         int recv_result;
 680         socklen_t address_size;
 681         struct sockaddr_in source_address;
 682         int nfound;
 683
 684
 685         /* wait for data to arrive (up time timeout) */
 686         tv.tv_sec=timeout;
 687         tv.tv_usec=0;
 688         FD_ZERO(&readfds);
 689         FD_ZERO(&oobfds);
 690         FD_SET(sock,&readfds);
 691         FD_SET(sock,&oobfds);
 692         nfound = select(sock+1,&readfds,NULL,&oobfds,&tv);
 693
 694         /* make sure some data has arrived */
 695         if(!FD_ISSET(sock,&readfds)){
 696                 if(verbose)
 697                         printf(_("No (more) data received (nfound: %d)\n"), nfound);
 698                 return ERROR;
 699                 }
 700
 701         else{
 702
 703                 /* 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
 704                    not being interpreted correctly.  sigh... */
 705                 bzero(&source_address,sizeof(source_address));
 706                 address_size=sizeof(source_address);
 707                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 708                 if(verbose)
 709                         printf("recv_result_1: %d\n",recv_result);
 710                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 711                 if(verbose)
 712                         printf("recv_result_2: %d\n",recv_result);
 713
 714                 if(recv_result==-1){
 715                         if(verbose){
 716                                 printf(_("recvfrom() failed, "));
 717                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 718                                 }
 719                         return ERROR;
 720                         }
 721                 else{
 722                         if(verbose){
 723                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 724                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 725                                 }
 726
 727                         memcpy(address,&source_address,sizeof(source_address));
 728                         return OK;
 729                         }
 730                 }
 731
 732         return OK;
 733         }
 734
 735
 736 /* creates a socket for DHCP communication */
 737 int create_dhcp_socket(void){
 738         struct sockaddr_in myname;
 739         struct ifreq interface;
 740         int sock;
 741         int flag=1;
 742
 743         /* Set up the address we're going to bind to. */
 744         bzero(&myname,sizeof(myname));
 745         myname.sin_family=AF_INET;
 746         /* listen to DHCP server port if we're in unicast mode */
 747         myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT);
 748         myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY;
 749         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 750
 751         /* create a socket for DHCP communications */
 752         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 753         if(sock<0){
 754                 printf(_("Error: Could not create socket!\n"));
 755                 exit(STATE_UNKNOWN);
 756                 }
 757
 758         if(verbose)
 759                 printf("DHCP socket: %d\n",sock);
 760
 761         /* set the reuse address flag so we don't get errors when restarting */
 762         flag=1;
 763         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 764                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 765                 exit(STATE_UNKNOWN);
 766                 }
 767
 768         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 769         if(!unicast && setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 770                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 771                 exit(STATE_UNKNOWN);
 772                 }
 773
 774         /* bind socket to interface */
 775 #if defined(__linux__)
 776         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ-1);
 777         interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
 778         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 779                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 780                 exit(STATE_UNKNOWN);
 781                 }
 782
 783 #else
 784         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ-1);
 785         interface.ifr_name[IFNAMSIZ-1]='\0';
 786 #endif
 787
 788         /* bind the socket */
 789         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 790                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 791                 exit(STATE_UNKNOWN);
 792                 }
 793
 794         return sock;
 795         }
 796
 797
 798 /* closes DHCP socket */
 799 int close_dhcp_socket(int sock){
 800
 801         close(sock);
 802
 803         return OK;
 804         }
 805
 806
 807 /* adds a requested server address to list in memory */
 808 int add_requested_server(struct in_addr server_address){
 809         requested_server *new_server;
 810
 811         new_server=(requested_server *)malloc(sizeof(requested_server));
 812         if(new_server==NULL)
 813                 return ERROR;
 814
 815         new_server->server_address=server_address;
 816         new_server->answered=FALSE;
 817
 818         new_server->next=requested_server_list;
 819         requested_server_list=new_server;
 820
 821         requested_servers++;
 822
 823         if(verbose)
 824                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 825
 826         return OK;
 827         }
 828
 829
 830
 831
 832 /* adds a DHCP OFFER to list in memory */
 833 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 834         dhcp_offer *new_offer;
 835         int x;
 836         unsigned option_type;
 837         unsigned option_length;
 838         struct in_addr serv_ident = {0};
 839
 840         if(offer_packet==NULL)
 841                 return ERROR;
 842
 843         /* process all DHCP options present in the packet */
 844         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 845
 846                 /* end of options (0 is really just a pad, but bail out anyway) */
 847                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 848                         break;
 849
 850                 /* get option type */
 851                 option_type=offer_packet->options[x++];
 852
 853                 /* get option length */
 854                 option_length=offer_packet->options[x++];
 855
 856                 if(verbose)
 857                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 858
 859                 /* get option data */
 860                 switch(option_type){
 861                 case DHCP_OPTION_LEASE_TIME:
 862                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 863                         dhcp_lease_time = ntohl(dhcp_lease_time);
 864                         break;
 865                 case DHCP_OPTION_RENEWAL_TIME:
 866                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 867                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 868                         break;
 869                 case DHCP_OPTION_REBINDING_TIME:
 870                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 871                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 872                         break;
 873                 case DHCP_OPTION_SERVER_IDENTIFIER:
 874                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 875                         break;
 876                         }
 877
 878                 /* skip option data we're ignoring */
 879                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 880                         x+=option_length;
 881                 }
 882
 883         if(verbose){
 884                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 885                         printf(_("Lease Time: Infinite\n"));
 886                 else
 887                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 888                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 889                         printf(_("Renewal Time: Infinite\n"));
 890                 else
 891                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 892                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 893                         printf(_("Rebinding Time: Infinite\n"));
 894                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 895                 }
 896
 897         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 898
 899         if(new_offer==NULL)
 900                 return ERROR;
 901
 902         /*
 903          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 904          * 'siaddr' field as the address of the server to use in the next step
 905          * of the client's bootstrap process.  A DHCP server may return its own
 906          * address in the 'siaddr' field, if the server is prepared to supply
 907          * the next bootstrap service (e.g., delivery of an operating system
 908          * executable image).  A DHCP server always returns its own address in
 909          * the 'server identifier' option."  'serv_ident' is the 'server
 910          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 911          * wasn't available) the IP address we received the DHCPOFFER from.  If
 912          * 'serv_ident' isn't available for some reason, we use 'source'.
 913          */
 914         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 915         new_offer->offered_address=offer_packet->yiaddr;
 916         new_offer->lease_time=dhcp_lease_time;
 917         new_offer->renewal_time=dhcp_renewal_time;
 918         new_offer->rebinding_time=dhcp_rebinding_time;
 919
 920
 921         if(verbose){
 922                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 923                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 924                 }
 925
 926         /* add new offer to head of list */
 927         new_offer->next=dhcp_offer_list;
 928         dhcp_offer_list=new_offer;
 929
 930         return OK;
 931         }
 932
 933
 934 /* frees memory allocated to DHCP OFFER list */
 935 int free_dhcp_offer_list(void){
 936         dhcp_offer *this_offer;
 937         dhcp_offer *next_offer;
 938
 939         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 940                 next_offer=this_offer->next;
 941                 free(this_offer);
 942                 }
 943
 944         return OK;
 945         }
 946
 947
 948 /* frees memory allocated to requested server list */
 949 int free_requested_server_list(void){
 950         requested_server *this_server;
 951         requested_server *next_server;
 952
 953         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 954                 next_server=this_server->next;
 955                 free(this_server);
 956                 }
 957
 958         return OK;
 959         }
 960
 961
 962 /* gets state and plugin output to return */
 963 int get_results(void){
 964         dhcp_offer *temp_offer;
 965         requested_server *temp_server;
 966         int result;
 967         u_int32_t max_lease_time=0;
 968
 969         received_requested_address=FALSE;
 970
 971         /* checks responses from requested servers */
 972         requested_responses=0;
 973         if(requested_servers>0){
 974
 975                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 976
 977                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 978
 979                                 /* get max lease time we were offered */
 980                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 981                                         max_lease_time=temp_offer->lease_time;
 982
 983                                 /* see if we got the address we requested */
 984                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 985                                         received_requested_address=TRUE;
 986
 987                                 /* see if the servers we wanted a response from talked to us or not */
 988                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 989                                         if(verbose){
 990                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 991                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 992                                                 if(temp_server->answered)
 993                                                         printf(_(" (duplicate)"));
 994                                                 printf(_("\n"));
 995                                                 }
 996                                         if(temp_server->answered == FALSE){
 997                                                 requested_responses++;
 998                                                 temp_server->answered=TRUE;
 999                                                 }
1000                                         }
1001                                 }
1002                         }
1003
1004                 }
1005
1006         /* else check and see if we got our requested address from any server */
1007         else{
1008
1009                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
1010
1011                         /* get max lease time we were offered */
1012                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
1013                                 max_lease_time=temp_offer->lease_time;
1014
1015                         /* see if we got the address we requested */
1016                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
1017                                 received_requested_address=TRUE;
1018                         }
1019                 }
1020
1021         result=STATE_OK;
1022         if(valid_responses==0)
1023                 result=STATE_CRITICAL;
1024         else if(requested_servers>0 && requested_responses==0)
1025                 result=STATE_CRITICAL;
1026         else if(requested_responses<requested_servers)
1027                 result=STATE_WARNING;
1028         else if(request_specific_address==TRUE && received_requested_address==FALSE)
1029                 result=STATE_WARNING;
1030
1031         if(result==0)               /* garrett honeycutt 2005 */
1032                 printf("OK: ");
1033         else if(result==1)
1034                 printf("WARNING: ");
1035         else if(result==2)
1036                 printf("CRITICAL: ");
1037         else if(result==3)
1038                 printf("UNKNOWN: ");
1039
1040         /* we didn't receive any DHCPOFFERs */
1041         if(dhcp_offer_list==NULL){
1042                 printf(_("No DHCPOFFERs were received.\n"));
1043                 return result;
1044                 }
1045
1046         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
1047
1048         if(requested_servers>0)
1049                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
1050
1051         if(request_specific_address==TRUE)
1052                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
1053
1054         printf(_(", max lease time = "));
1055         if(max_lease_time==DHCP_INFINITE_TIME)
1056                 printf(_("Infinity"));
1057         else
1058                 printf("%lu sec",(unsigned long)max_lease_time);
1059
1060         printf(".\n");
1061
1062         return result;
1063         }
1064
1065
1066 /* process command-line arguments */
1067 int process_arguments(int argc, char **argv){
1068         int c;
1069
1070         if(argc<1)
1071                 return ERROR;
1072
1073         c=0;
1074         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1075
1076                 /*
1077                 if(is_option(argv[c]))
1078                         continue;
1079                 */
1080                 }
1081
1082         return validate_arguments();
1083         }
1084
1085
1086
1087 int call_getopt(int argc, char **argv){
1088         int c=0;
1089         int i=0;
1090
1091         int option_index = 0;
1092         static struct option long_options[] =
1093         {
1094                 {"serverip",       required_argument,0,'s'},
1095                 {"requestedip",    required_argument,0,'r'},
1096                 {"timeout",        required_argument,0,'t'},
1097                 {"interface",      required_argument,0,'i'},
1098                 {"mac",            required_argument,0,'m'},
1099                 {"unicast",        no_argument,      0,'u'},
1100                 {"verbose",        no_argument,      0,'v'},
1101                 {"version",        no_argument,      0,'V'},
1102                 {"help",           no_argument,      0,'h'},
1103                 {0,0,0,0}
1104         };
1105
1106         while(1){
1107                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
1108
1109                 i++;
1110
1111                 if(c==-1||c==EOF||c==1)
1112                         break;
1113
1114                 switch(c){
1115                 case 'w':
1116                 case 'r':
1117                 case 't':
1118                 case 'i':
1119                         i++;
1120                         break;
1121                 default:
1122                         break;
1123                         }
1124
1125                 switch(c){
1126
1127                 case 's': /* DHCP server address */
1128                         resolve_host(optarg,&dhcp_ip);
1129                         add_requested_server(dhcp_ip);
1130                         break;
1131
1132                 case 'r': /* address we are requested from DHCP servers */
1133                         resolve_host(optarg,&requested_address);
1134                         request_specific_address=TRUE;
1135                         break;
1136
1137                 case 't': /* timeout */
1138
1139                         /*
1140                         if(is_intnonneg(optarg))
1141                         */
1142                         if(atoi(optarg)>0)
1143                                 dhcpoffer_timeout=atoi(optarg);
1144                         /*
1145                         else
1146                                 usage("Time interval must be a nonnegative integer\n");
1147                         */
1148                         break;
1149
1150                 case 'm': /* MAC address */
1151
1152                         if((user_specified_mac=mac_aton(optarg)) == NULL)
1153                                 usage("Cannot parse MAC address.\n");
1154                         if(verbose)
1155                                 print_hardware_address(user_specified_mac);
1156
1157                         break;
1158
1159                 case 'i': /* interface name */
1160
1161                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1162                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1163
1164                         break;
1165
1166                 case 'u': /* unicast testing */
1167                         unicast=1;
1168                         break;
1169
1170                 case 'V': /* version */
1171                         print_revision(progname,revision);
1172                         exit(STATE_OK);
1173
1174                 case 'h': /* help */
1175                         print_help();
1176                         exit(STATE_OK);
1177
1178                 case 'v': /* verbose */
1179                         verbose=1;
1180                         break;
1181
1182                 case '?': /* help */
1183                         usage5 ();
1184                         break;
1185
1186                 default:
1187                         break;
1188                         }
1189                 }
1190
1191         return i;
1192         }
1193
1194
1195 int validate_arguments(void){
1196
1197         return OK;
1198         }
1199
1200
1201 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1202 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1203
1204 /* get a message from a stream; return type of message */
1205 static int get_msg(int fd){
1206         int flags = 0;
1207         int res, ret;
1208         ctl_area[0] = 0;
1209         dat_area[0] = 0;
1210         ret = 0;
1211         res = getmsg(fd, &ctl, &dat, &flags);
1212
1213         if(res < 0){
1214                 if(errno == EINTR){
1215                         return(GOT_INTR);
1216                         }
1217                 else{
1218                         printf("%s\n", "get_msg FAILED.");
1219                         return(GOT_ERR);
1220                         }
1221                 }
1222         if(ctl.len > 0){
1223                 ret |= GOT_CTRL;
1224                 }
1225         if(dat.len > 0){
1226                 ret |= GOT_DATA;
1227                 }
1228
1229         return(ret);
1230         }
1231
1232 /* verify that dl_primitive in ctl_area = prim */
1233 static int check_ctrl(int prim){
1234         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1235
1236         if(err_ack->dl_primitive != prim){
1237                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1238                 exit(STATE_UNKNOWN);
1239                 }
1240
1241         return 0;
1242         }
1243
1244 /* put a control message on a stream */
1245 static int put_ctrl(int fd, int len, int pri){
1246
1247         ctl.len = len;
1248         if(putmsg(fd, &ctl, 0, pri) < 0){
1249                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1250                 exit(STATE_UNKNOWN);
1251                 }
1252
1253         return  0;
1254         }
1255
1256 /* put a control + data message on a stream */
1257 static int put_both(int fd, int clen, int dlen, int pri){
1258
1259         ctl.len = clen;
1260         dat.len = dlen;
1261         if(putmsg(fd, &ctl, &dat, pri) < 0){
1262                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1263                 exit(STATE_UNKNOWN);
1264                 }
1265
1266         return  0;
1267         }
1268
1269 /* open file descriptor and attach */
1270 static int dl_open(const char *dev, int unit, int *fd){
1271         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1272
1273         if((*fd = open(dev, O_RDWR)) == -1){
1274                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1275                 exit(STATE_UNKNOWN);
1276                 }
1277         attach_req->dl_primitive = DL_ATTACH_REQ;
1278         attach_req->dl_ppa = unit;
1279         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1280         get_msg(*fd);
1281         return check_ctrl(DL_OK_ACK);
1282         }
1283
1284 /* send DL_BIND_REQ */
1285 static int dl_bind(int fd, int sap, u_char *addr){
1286         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1287         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1288
1289         bind_req->dl_primitive = DL_BIND_REQ;
1290         bind_req->dl_sap = sap;
1291         bind_req->dl_max_conind = 1;
1292         bind_req->dl_service_mode = DL_CLDLS;
1293         bind_req->dl_conn_mgmt = 0;
1294         bind_req->dl_xidtest_flg = 0;
1295         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1296         get_msg(fd);
1297         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1298                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1299                 exit(STATE_UNKNOWN);
1300                 }
1301         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1302               bind_ack->dl_addr_length);
1303
1304         return 0;
1305         }
1306
1307 /***********************************************************************
1308  * interface:
1309  * function mac_addr_dlpi - get the mac address of the interface with
1310  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1311  *
1312  * parameter: addr: an array of six bytes, has to be allocated by the caller
1313  *
1314  * return: 0 if OK, -1 if the address could not be determined
1315  *
1316  *
1317  ***********************************************************************/
1318
1319 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1320         int fd;
1321         u_char mac_addr[25];
1322
1323         if(GOT_ERR != dl_open(dev, unit, &fd)){
1324                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1325                         bcopy( mac_addr, addr, 6);
1326                         return 0;
1327                         }
1328                 }
1329         close(fd);
1330
1331         return -1;
1332         }
1333
1334 /* Kompf 2000-2003 */
1335 #endif
1336
1337
1338 /* resolve host name or die (TODO: move this to netutils.c!) */
1339 void resolve_host(const char *in,struct in_addr *out){
1340         struct addrinfo hints, *ai;
1341
1342         memset(&hints,0,sizeof(hints));
1343         hints.ai_family=PF_INET;
1344         if (getaddrinfo(in,NULL,&hints,&ai) != 0)
1345                 usage_va(_("Invalid hostname/address - %s"),optarg);
1346
1347         memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out));
1348         freeaddrinfo(ai);
1349         }
1350
1351
1352 /* parse MAC address string, return 6 bytes (unterminated) or NULL */
1353 unsigned char *mac_aton(const char *string){
1354         static unsigned char result[6];
1355         char tmp[3];
1356         unsigned i, j;
1357
1358         for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
1359                 /* ignore ':' and any other non-hex character */
1360                 if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
1361                         continue;
1362                 tmp[0]=string[i];
1363                 tmp[1]=string[i+1];
1364                 tmp[2]='\0';
1365                 result[j]=strtol(tmp,(char **)NULL,16);
1366                 i++;
1367                 j++;
1368                 }
1369
1370         return (j==6) ? result : NULL;
1371         }
1372
1373
1374 void print_hardware_address(const unsigned char *address){
1375         int i;
1376
1377         printf(_("Hardware address: "));
1378         for (i=0; i<5; i++)
1379                 printf("%2.2x:", address[i]);
1380         printf("%2.2x", address[i]);
1381         putchar('\n');
1382         }
1383
1384
1385 /* print usage help */
1386 void print_help(void){
1387
1388         print_revision(progname,revision);
1389
1390         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1391         printf (COPYRIGHT, copyright, email);
1392
1393         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1394
1395   printf ("\n\n");
1396
1397         print_usage();
1398
1399         printf (_(UT_HELP_VRSN));
1400         printf (_(UT_EXTRA_OPTS));
1401
1402         printf (_(UT_VERBOSE));
1403
1404         printf (" %s\n", "-s, --serverip=IPADDRESS");
1405   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1406   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1407   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1408   printf (" %s\n", "-t, --timeout=INTEGER");
1409   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1410   printf (" %s\n", "-i, --interface=STRING");
1411   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1412   printf (" %s\n", "-m, --mac=STRING");
1413   printf ("    %s\n", _("MAC address to use in the DHCP request"));
1414   printf (" %s\n", "-u, --unicast");
1415   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
1416
1417 #ifdef NP_EXTRA_OPTS
1418   printf ("\n");
1419   printf ("%s\n", _("Notes:"));
1420   printf (_(UT_EXTRA_OPTS_NOTES));
1421 #endif
1422
1423   printf (_(UT_SUPPORT));
1424         return;
1425         }
1426
1427
1428 void
1429 print_usage(void){
1430
1431   printf (_("Usage:"));
1432   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
1433   printf ("                  [-i interface] [-m mac]\n");
1434
1435         return;
1436         }
1437
1438
1439