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         /* Parse extra opts if any */
 272         argv=np_extra_opts(&argc, argv, progname);
 273
 274         if(process_arguments(argc,argv)!=OK){
 275                 usage4 (_("Could not parse arguments"));
 276                 }
 277
 278         /* this plugin almost certainly needs root permissions. */
 279         np_warn_if_not_root();
 280
 281         /* create socket for DHCP communications */
 282         dhcp_socket=create_dhcp_socket();
 283
 284         /* get hardware address of client machine */
 285         if(user_specified_mac!=NULL)
 286                 memcpy(client_hardware_address,user_specified_mac,6);
 287         else
 288                 get_hardware_address(dhcp_socket,network_interface_name);
 289
 290         if(unicast) /* get IP address of client machine */
 291                 get_ip_address(dhcp_socket,network_interface_name);
 292
 293         /* send DHCPDISCOVER packet */
 294         send_dhcp_discover(dhcp_socket);
 295
 296         /* wait for a DHCPOFFER packet */
 297         get_dhcp_offer(dhcp_socket);
 298
 299         /* close socket we created */
 300         close_dhcp_socket(dhcp_socket);
 301
 302         /* determine state/plugin output to return */
 303         result=get_results();
 304
 305         /* free allocated memory */
 306         free_dhcp_offer_list();
 307         free_requested_server_list();
 308
 309         return result;
 310         }
 311
 312
 313
 314 /* determines hardware address on client machine */
 315 int get_hardware_address(int sock,char *interface_name){
 316
 317 #if defined(__linux__)
 318         struct ifreq ifr;
 319
 320         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 321         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 322
 323         /* try and grab hardware address of requested interface */
 324         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 325                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 326                 exit(STATE_UNKNOWN);
 327                 }
 328
 329         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 330
 331 #elif defined(__bsd__)
 332                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 333
 334         int                     mib[6], len;
 335         char                    *buf;
 336         unsigned char           *ptr;
 337         struct if_msghdr        *ifm;
 338         struct sockaddr_dl      *sdl;
 339
 340         mib[0] = CTL_NET;
 341         mib[1] = AF_ROUTE;
 342         mib[2] = 0;
 343         mib[3] = AF_LINK;
 344         mib[4] = NET_RT_IFLIST;
 345
 346         if((mib[5] = if_nametoindex(interface_name)) == 0){
 347                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 348                 exit(STATE_UNKNOWN);
 349                 }
 350
 351         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 352                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 353                 exit(STATE_UNKNOWN);
 354                 }
 355
 356         if((buf = malloc(len)) == NULL){
 357                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 358                 exit(4);
 359                 }
 360
 361         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 362                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 363                 exit(STATE_UNKNOWN);
 364                 }
 365
 366         ifm = (struct if_msghdr *)buf;
 367         sdl = (struct sockaddr_dl *)(ifm + 1);
 368         ptr = (unsigned char *)LLADDR(sdl);
 369         memcpy(&client_hardware_address[0], ptr, 6) ;
 370                                                 /* King 2004 */
 371
 372 #elif defined(__sun__) || defined(__solaris__)
 373
 374                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 375         long stat;
 376         char dev[20] = "/dev/";
 377         char *p;
 378         int unit;
 379
 380         for(p = interface_name; *p && isalpha(*p); p++)
 381                 /* no-op */ ;
 382         if( p != '\0' ){
 383                 unit = atoi(p) ;
 384                 *p = '\0' ;
 385                 strncat(dev, interface_name, 6) ;
 386                 }
 387         else{
 388                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 389                 exit(STATE_UNKNOWN);
 390                 }
 391         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 392         if(stat != 0){
 393                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 394                 exit(STATE_UNKNOWN);
 395                 }
 396
 397 #elif defined(__hpux__)
 398
 399         long stat;
 400         char dev[20] = "/dev/dlpi" ;
 401         int unit = 0;
 402
 403         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 404         if(stat != 0){
 405                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 406                 exit(STATE_UNKNOWN);
 407                 }
 408                                                 /* Kompf 2000-2003 */
 409
 410 #else
 411         printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
 412         exit(STATE_UNKNOWN);
 413 #endif
 414
 415         if(verbose)
 416                 print_hardware_address(client_hardware_address);
 417
 418         return OK;
 419         }
 420
 421 /* determines IP address of the client interface */
 422 int get_ip_address(int sock,char *interface_name){
 423 #if defined(SIOCGIFADDR)
 424         struct ifreq ifr;
 425
 426         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1);
 427         ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0';
 428
 429         if(ioctl(sock,SIOCGIFADDR,&ifr)<0){
 430                 printf(_("Error: Cannot determine IP address of interface %s\n"),
 431                         interface_name);
 432                 exit(STATE_UNKNOWN);
 433                 }
 434
 435         my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
 436
 437 #else
 438         printf(_("Error: Cannot get interface IP address on this platform.\n"));
 439         exit(STATE_UNKNOWN);
 440 #endif
 441
 442         if(verbose)
 443                 printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip));
 444
 445         return OK;
 446         }
 447
 448 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 449 int send_dhcp_discover(int sock){
 450         dhcp_packet discover_packet;
 451         struct sockaddr_in sockaddr_broadcast;
 452     unsigned short opts;
 453
 454
 455         /* clear the packet data structure */
 456         bzero(&discover_packet,sizeof(discover_packet));
 457
 458
 459         /* boot request flag (backward compatible with BOOTP servers) */
 460         discover_packet.op=BOOTREQUEST;
 461
 462         /* hardware address type */
 463         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 464
 465         /* length of our hardware address */
 466         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 467
 468         /*
 469          * transaction ID is supposed to be random.  We won't use the address so
 470          * we don't care about high entropy here.  time(2) is good enough.
 471          */
 472         srand(time(NULL));
 473         packet_xid=random();
 474         discover_packet.xid=htonl(packet_xid);
 475
 476         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 477         /* downright bizzarre... */
 478         ntohl(discover_packet.xid);
 479
 480         /*discover_packet.secs=htons(65535);*/
 481         discover_packet.secs=0xFF;
 482
 483         /*
 484          * server needs to know if it should broadcast or unicast its response:
 485          * 0x8000L == 32768 == 1 << 15 == broadcast, 0 == unicast
 486          */
 487         discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG);
 488
 489         /* our hardware address */
 490         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 491
 492         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 493         discover_packet.options[0]='\x63';
 494         discover_packet.options[1]='\x82';
 495         discover_packet.options[2]='\x53';
 496         discover_packet.options[3]='\x63';
 497
 498     opts = 4;
 499         /* DHCP message type is embedded in options field */
 500         discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 501         discover_packet.options[opts++]='\x01';               /* DHCP message option length in bytes */
 502         discover_packet.options[opts++]=DHCPDISCOVER;
 503
 504         /* the IP address we're requesting */
 505         if(request_specific_address==TRUE){
 506                 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
 507                 discover_packet.options[opts++]='\x04';
 508                 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
 509                 opts += sizeof(requested_address);
 510                 }
 511         discover_packet.options[opts++]=DHCP_OPTION_END;
 512
 513         /* unicast fields */
 514         if(unicast)
 515                 discover_packet.giaddr.s_addr = my_ip.s_addr;
 516
 517         /* see RFC 1542, 4.1.1 */
 518         discover_packet.hops = unicast ? 1 : 0;
 519
 520         /* send the DHCPDISCOVER packet to broadcast address */
 521         sockaddr_broadcast.sin_family=AF_INET;
 522         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 523         sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.s_addr : INADDR_BROADCAST;
 524         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 525
 526
 527         if(verbose){
 528                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 529                 printf("DHCPDISCOVER XID: %u (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 530                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 531                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 532                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 533                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 534                 }
 535
 536         /* send the DHCPDISCOVER packet out */
 537         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 538
 539         if(verbose)
 540                 printf("\n\n");
 541
 542         return OK;
 543         }
 544
 545
 546
 547
 548 /* waits for a DHCPOFFER message from one or more DHCP servers */
 549 int get_dhcp_offer(int sock){
 550         dhcp_packet offer_packet;
 551         struct sockaddr_in source;
 552         struct sockaddr_in via;
 553         int result=OK;
 554         int responses=0;
 555         int x;
 556         time_t start_time;
 557         time_t current_time;
 558
 559         time(&start_time);
 560
 561         /* receive as many responses as we can */
 562         for(responses=0,valid_responses=0;;){
 563
 564                 time(&current_time);
 565                 if((current_time-start_time)>=dhcpoffer_timeout)
 566                         break;
 567
 568                 if(verbose)
 569                         printf("\n\n");
 570
 571                 bzero(&source,sizeof(source));
 572                 bzero(&via,sizeof(via));
 573                 bzero(&offer_packet,sizeof(offer_packet));
 574
 575                 result=OK;
 576                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 577
 578                 if(result!=OK){
 579                         if(verbose)
 580                                 printf(_("Result=ERROR\n"));
 581
 582                         continue;
 583                         }
 584                 else{
 585                         if(verbose)
 586                                 printf(_("Result=OK\n"));
 587
 588                         responses++;
 589                         }
 590
 591                 /* The "source" is either a server or a relay. */
 592                 /* Save a copy of "source" into "via" even if it's via itself */
 593                 memcpy(&via,&source,sizeof(source)) ;
 594
 595                 /* If siaddr is non-zero, set "source" to siaddr */
 596                 if(offer_packet.siaddr.s_addr != 0L){
 597                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 598                         }
 599
 600                 if(verbose){
 601                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 602                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 603                         printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 604                         }
 605
 606                 /* check packet xid to see if its the same as the one we used in the discover packet */
 607                 if(ntohl(offer_packet.xid)!=packet_xid){
 608                         if(verbose)
 609                                 printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 610
 611                         continue;
 612                         }
 613
 614                 /* check hardware address */
 615                 result=OK;
 616                 if(verbose)
 617                         printf("DHCPOFFER chaddr: ");
 618
 619                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 620                         if(verbose)
 621                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 622
 623                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 624                                 result=ERROR;
 625                         }
 626                 if(verbose)
 627                         printf("\n");
 628
 629                 if(result==ERROR){
 630                         if(verbose)
 631                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 632
 633                         continue;
 634                         }
 635
 636                 if(verbose){
 637                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 638                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 639                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 640                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 641                         }
 642
 643                 add_dhcp_offer(source.sin_addr,&offer_packet);
 644
 645                 valid_responses++;
 646                 }
 647
 648         if(verbose){
 649                 printf(_("Total responses seen on the wire: %d\n"),responses);
 650                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 651                 }
 652
 653         return OK;
 654         }
 655
 656
 657
 658 /* sends a DHCP packet */
 659 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 660         int result;
 661
 662         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 663
 664         if(verbose)
 665                 printf(_("send_dhcp_packet result: %d\n"),result);
 666
 667         if(result<0)
 668                 return ERROR;
 669
 670         return OK;
 671         }
 672
 673
 674
 675 /* receives a DHCP packet */
 676 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 677         struct timeval tv;
 678         fd_set readfds;
 679         fd_set oobfds;
 680         int recv_result;
 681         socklen_t address_size;
 682         struct sockaddr_in source_address;
 683         int nfound;
 684
 685
 686         /* wait for data to arrive (up time timeout) */
 687         tv.tv_sec=timeout;
 688         tv.tv_usec=0;
 689         FD_ZERO(&readfds);
 690         FD_ZERO(&oobfds);
 691         FD_SET(sock,&readfds);
 692         FD_SET(sock,&oobfds);
 693         nfound = select(sock+1,&readfds,NULL,&oobfds,&tv);
 694
 695         /* make sure some data has arrived */
 696         if(!FD_ISSET(sock,&readfds)){
 697                 if(verbose)
 698                         printf(_("No (more) data received (nfound: %d)\n"), nfound);
 699                 return ERROR;
 700                 }
 701
 702         else{
 703
 704                 /* 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
 705                    not being interpreted correctly.  sigh... */
 706                 bzero(&source_address,sizeof(source_address));
 707                 address_size=sizeof(source_address);
 708                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 709                 if(verbose)
 710                         printf("recv_result_1: %d\n",recv_result);
 711                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 712                 if(verbose)
 713                         printf("recv_result_2: %d\n",recv_result);
 714
 715                 if(recv_result==-1){
 716                         if(verbose){
 717                                 printf(_("recvfrom() failed, "));
 718                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 719                                 }
 720                         return ERROR;
 721                         }
 722                 else{
 723                         if(verbose){
 724                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 725                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 726                                 }
 727
 728                         memcpy(address,&source_address,sizeof(source_address));
 729                         return OK;
 730                         }
 731                 }
 732
 733         return OK;
 734         }
 735
 736
 737 /* creates a socket for DHCP communication */
 738 int create_dhcp_socket(void){
 739         struct sockaddr_in myname;
 740         struct ifreq interface;
 741         int sock;
 742         int flag=1;
 743
 744         /* Set up the address we're going to bind to. */
 745         bzero(&myname,sizeof(myname));
 746         myname.sin_family=AF_INET;
 747         /* listen to DHCP server port if we're in unicast mode */
 748         myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT);
 749         myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY;
 750         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 751
 752         /* create a socket for DHCP communications */
 753         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 754         if(sock<0){
 755                 printf(_("Error: Could not create socket!\n"));
 756                 exit(STATE_UNKNOWN);
 757                 }
 758
 759         if(verbose)
 760                 printf("DHCP socket: %d\n",sock);
 761
 762         /* set the reuse address flag so we don't get errors when restarting */
 763         flag=1;
 764         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 765                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 766                 exit(STATE_UNKNOWN);
 767                 }
 768
 769         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 770         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 771                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 772                 exit(STATE_UNKNOWN);
 773                 }
 774
 775         /* bind socket to interface */
 776 #if defined(__linux__)
 777         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ-1);
 778         interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0';
 779         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 780                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 781                 exit(STATE_UNKNOWN);
 782                 }
 783
 784 #else
 785         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ-1);
 786         interface.ifr_name[IFNAMSIZ-1]='\0';
 787 #endif
 788
 789         /* bind the socket */
 790         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 791                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 792                 exit(STATE_UNKNOWN);
 793                 }
 794
 795         return sock;
 796         }
 797
 798
 799 /* closes DHCP socket */
 800 int close_dhcp_socket(int sock){
 801
 802         close(sock);
 803
 804         return OK;
 805         }
 806
 807
 808 /* adds a requested server address to list in memory */
 809 int add_requested_server(struct in_addr server_address){
 810         requested_server *new_server;
 811
 812         new_server=(requested_server *)malloc(sizeof(requested_server));
 813         if(new_server==NULL)
 814                 return ERROR;
 815
 816         new_server->server_address=server_address;
 817         new_server->answered=FALSE;
 818
 819         new_server->next=requested_server_list;
 820         requested_server_list=new_server;
 821
 822         requested_servers++;
 823
 824         if(verbose)
 825                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 826
 827         return OK;
 828         }
 829
 830
 831
 832
 833 /* adds a DHCP OFFER to list in memory */
 834 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 835         dhcp_offer *new_offer;
 836         int x;
 837         unsigned option_type;
 838         unsigned option_length;
 839         struct in_addr serv_ident = {0};
 840
 841         if(offer_packet==NULL)
 842                 return ERROR;
 843
 844         /* process all DHCP options present in the packet */
 845         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 846
 847                 /* end of options (0 is really just a pad, but bail out anyway) */
 848                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 849                         break;
 850
 851                 /* get option type */
 852                 option_type=offer_packet->options[x++];
 853
 854                 /* get option length */
 855                 option_length=offer_packet->options[x++];
 856
 857                 if(verbose)
 858                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 859
 860                 /* get option data */
 861                 switch(option_type){
 862                 case DHCP_OPTION_LEASE_TIME:
 863                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 864                         dhcp_lease_time = ntohl(dhcp_lease_time);
 865                         break;
 866                 case DHCP_OPTION_RENEWAL_TIME:
 867                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 868                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 869                         break;
 870                 case DHCP_OPTION_REBINDING_TIME:
 871                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 872                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 873                         break;
 874                 case DHCP_OPTION_SERVER_IDENTIFIER:
 875                         memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
 876                         break;
 877                         }
 878
 879                 /* skip option data we're ignoring */
 880                 if(option_type!=DHCP_OPTION_REBINDING_TIME)
 881                         x+=option_length;
 882                 }
 883
 884         if(verbose){
 885                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 886                         printf(_("Lease Time: Infinite\n"));
 887                 else
 888                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 889                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 890                         printf(_("Renewal Time: Infinite\n"));
 891                 else
 892                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 893                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 894                         printf(_("Rebinding Time: Infinite\n"));
 895                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 896                 }
 897
 898         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 899
 900         if(new_offer==NULL)
 901                 return ERROR;
 902
 903         /*
 904          * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
 905          * 'siaddr' field as the address of the server to use in the next step
 906          * of the client's bootstrap process.  A DHCP server may return its own
 907          * address in the 'siaddr' field, if the server is prepared to supply
 908          * the next bootstrap service (e.g., delivery of an operating system
 909          * executable image).  A DHCP server always returns its own address in
 910          * the 'server identifier' option."  'serv_ident' is the 'server
 911          * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
 912          * wasn't available) the IP address we received the DHCPOFFER from.  If
 913          * 'serv_ident' isn't available for some reason, we use 'source'.
 914          */
 915         new_offer->server_address=serv_ident.s_addr?serv_ident:source;
 916         new_offer->offered_address=offer_packet->yiaddr;
 917         new_offer->lease_time=dhcp_lease_time;
 918         new_offer->renewal_time=dhcp_renewal_time;
 919         new_offer->rebinding_time=dhcp_rebinding_time;
 920
 921
 922         if(verbose){
 923                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 924                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 925                 }
 926
 927         /* add new offer to head of list */
 928         new_offer->next=dhcp_offer_list;
 929         dhcp_offer_list=new_offer;
 930
 931         return OK;
 932         }
 933
 934
 935 /* frees memory allocated to DHCP OFFER list */
 936 int free_dhcp_offer_list(void){
 937         dhcp_offer *this_offer;
 938         dhcp_offer *next_offer;
 939
 940         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 941                 next_offer=this_offer->next;
 942                 free(this_offer);
 943                 }
 944
 945         return OK;
 946         }
 947
 948
 949 /* frees memory allocated to requested server list */
 950 int free_requested_server_list(void){
 951         requested_server *this_server;
 952         requested_server *next_server;
 953
 954         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 955                 next_server=this_server->next;
 956                 free(this_server);
 957                 }
 958
 959         return OK;
 960         }
 961
 962
 963 /* gets state and plugin output to return */
 964 int get_results(void){
 965         dhcp_offer *temp_offer;
 966         requested_server *temp_server;
 967         int result;
 968         u_int32_t max_lease_time=0;
 969
 970         received_requested_address=FALSE;
 971
 972         /* checks responses from requested servers */
 973         requested_responses=0;
 974         if(requested_servers>0){
 975
 976                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 977
 978                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 979
 980                                 /* get max lease time we were offered */
 981                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 982                                         max_lease_time=temp_offer->lease_time;
 983
 984                                 /* see if we got the address we requested */
 985                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 986                                         received_requested_address=TRUE;
 987
 988                                 /* see if the servers we wanted a response from talked to us or not */
 989                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 990                                         if(verbose){
 991                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 992                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 993                                                 if(temp_server->answered)
 994                                                         printf(_(" (duplicate)"));
 995                                                 printf(_("\n"));
 996                                                 }
 997                                         if(temp_server->answered == FALSE){
 998                                                 requested_responses++;
 999                                                 temp_server->answered=TRUE;
1000                                                 }
1001                                         }
1002                                 }
1003                         }
1004
1005                 }
1006
1007         /* else check and see if we got our requested address from any server */
1008         else{
1009
1010                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
1011
1012                         /* get max lease time we were offered */
1013                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
1014                                 max_lease_time=temp_offer->lease_time;
1015
1016                         /* see if we got the address we requested */
1017                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
1018                                 received_requested_address=TRUE;
1019                         }
1020                 }
1021
1022         result=STATE_OK;
1023         if(valid_responses==0)
1024                 result=STATE_CRITICAL;
1025         else if(requested_servers>0 && requested_responses==0)
1026                 result=STATE_CRITICAL;
1027         else if(requested_responses<requested_servers)
1028                 result=STATE_WARNING;
1029         else if(request_specific_address==TRUE && received_requested_address==FALSE)
1030                 result=STATE_WARNING;
1031
1032         if(result==0)               /* garrett honeycutt 2005 */
1033                 printf("OK: ");
1034         else if(result==1)
1035                 printf("WARNING: ");
1036         else if(result==2)
1037                 printf("CRITICAL: ");
1038         else if(result==3)
1039                 printf("UNKNOWN: ");
1040
1041         /* we didn't receive any DHCPOFFERs */
1042         if(dhcp_offer_list==NULL){
1043                 printf(_("No DHCPOFFERs were received.\n"));
1044                 return result;
1045                 }
1046
1047         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
1048
1049         if(requested_servers>0)
1050                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
1051
1052         if(request_specific_address==TRUE)
1053                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
1054
1055         printf(_(", max lease time = "));
1056         if(max_lease_time==DHCP_INFINITE_TIME)
1057                 printf(_("Infinity"));
1058         else
1059                 printf("%lu sec",(unsigned long)max_lease_time);
1060
1061         printf(".\n");
1062
1063         return result;
1064         }
1065
1066
1067 /* process command-line arguments */
1068 int process_arguments(int argc, char **argv){
1069         int c;
1070
1071         if(argc<1)
1072                 return ERROR;
1073
1074         c=0;
1075         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1076
1077                 /*
1078                 if(is_option(argv[c]))
1079                         continue;
1080                 */
1081                 }
1082
1083         return validate_arguments();
1084         }
1085
1086
1087
1088 int call_getopt(int argc, char **argv){
1089         int c=0;
1090         int i=0;
1091
1092         int option_index = 0;
1093         static struct option long_options[] =
1094         {
1095                 {"serverip",       required_argument,0,'s'},
1096                 {"requestedip",    required_argument,0,'r'},
1097                 {"timeout",        required_argument,0,'t'},
1098                 {"interface",      required_argument,0,'i'},
1099                 {"mac",            required_argument,0,'m'},
1100                 {"unicast",        no_argument,      0,'u'},
1101                 {"verbose",        no_argument,      0,'v'},
1102                 {"version",        no_argument,      0,'V'},
1103                 {"help",           no_argument,      0,'h'},
1104                 {0,0,0,0}
1105         };
1106
1107         while(1){
1108                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
1109
1110                 i++;
1111
1112                 if(c==-1||c==EOF||c==1)
1113                         break;
1114
1115                 switch(c){
1116                 case 'w':
1117                 case 'r':
1118                 case 't':
1119                 case 'i':
1120                         i++;
1121                         break;
1122                 default:
1123                         break;
1124                         }
1125
1126                 switch(c){
1127
1128                 case 's': /* DHCP server address */
1129                         resolve_host(optarg,&dhcp_ip);
1130                         add_requested_server(dhcp_ip);
1131                         break;
1132
1133                 case 'r': /* address we are requested from DHCP servers */
1134                         resolve_host(optarg,&requested_address);
1135                         request_specific_address=TRUE;
1136                         break;
1137
1138                 case 't': /* timeout */
1139
1140                         /*
1141                         if(is_intnonneg(optarg))
1142                         */
1143                         if(atoi(optarg)>0)
1144                                 dhcpoffer_timeout=atoi(optarg);
1145                         /*
1146                         else
1147                                 usage("Time interval must be a nonnegative integer\n");
1148                         */
1149                         break;
1150
1151                 case 'm': /* MAC address */
1152
1153                         if((user_specified_mac=mac_aton(optarg)) == NULL)
1154                                 usage("Cannot parse MAC address.\n");
1155                         if(verbose)
1156                                 print_hardware_address(user_specified_mac);
1157
1158                         break;
1159
1160                 case 'i': /* interface name */
1161
1162                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1163                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1164
1165                         break;
1166
1167                 case 'u': /* unicast testing */
1168                         unicast=1;
1169                         break;
1170
1171                 case 'V': /* version */
1172                         print_revision(progname,revision);
1173                         exit(STATE_OK);
1174
1175                 case 'h': /* help */
1176                         print_help();
1177                         exit(STATE_OK);
1178
1179                 case 'v': /* verbose */
1180                         verbose=1;
1181                         break;
1182
1183                 case '?': /* help */
1184                         usage5 ();
1185                         break;
1186
1187                 default:
1188                         break;
1189                         }
1190                 }
1191
1192         return i;
1193         }
1194
1195
1196 int validate_arguments(void){
1197
1198         return OK;
1199         }
1200
1201
1202 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1203 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1204
1205 /* get a message from a stream; return type of message */
1206 static int get_msg(int fd){
1207         int flags = 0;
1208         int res, ret;
1209         ctl_area[0] = 0;
1210         dat_area[0] = 0;
1211         ret = 0;
1212         res = getmsg(fd, &ctl, &dat, &flags);
1213
1214         if(res < 0){
1215                 if(errno == EINTR){
1216                         return(GOT_INTR);
1217                         }
1218                 else{
1219                         printf("%s\n", "get_msg FAILED.");
1220                         return(GOT_ERR);
1221                         }
1222                 }
1223         if(ctl.len > 0){
1224                 ret |= GOT_CTRL;
1225                 }
1226         if(dat.len > 0){
1227                 ret |= GOT_DATA;
1228                 }
1229
1230         return(ret);
1231         }
1232
1233 /* verify that dl_primitive in ctl_area = prim */
1234 static int check_ctrl(int prim){
1235         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1236
1237         if(err_ack->dl_primitive != prim){
1238                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1239                 exit(STATE_UNKNOWN);
1240                 }
1241
1242         return 0;
1243         }
1244
1245 /* put a control message on a stream */
1246 static int put_ctrl(int fd, int len, int pri){
1247
1248         ctl.len = len;
1249         if(putmsg(fd, &ctl, 0, pri) < 0){
1250                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1251                 exit(STATE_UNKNOWN);
1252                 }
1253
1254         return  0;
1255         }
1256
1257 /* put a control + data message on a stream */
1258 static int put_both(int fd, int clen, int dlen, int pri){
1259
1260         ctl.len = clen;
1261         dat.len = dlen;
1262         if(putmsg(fd, &ctl, &dat, pri) < 0){
1263                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1264                 exit(STATE_UNKNOWN);
1265                 }
1266
1267         return  0;
1268         }
1269
1270 /* open file descriptor and attach */
1271 static int dl_open(const char *dev, int unit, int *fd){
1272         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1273
1274         if((*fd = open(dev, O_RDWR)) == -1){
1275                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1276                 exit(STATE_UNKNOWN);
1277                 }
1278         attach_req->dl_primitive = DL_ATTACH_REQ;
1279         attach_req->dl_ppa = unit;
1280         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1281         get_msg(*fd);
1282         return check_ctrl(DL_OK_ACK);
1283         }
1284
1285 /* send DL_BIND_REQ */
1286 static int dl_bind(int fd, int sap, u_char *addr){
1287         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1288         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1289
1290         bind_req->dl_primitive = DL_BIND_REQ;
1291         bind_req->dl_sap = sap;
1292         bind_req->dl_max_conind = 1;
1293         bind_req->dl_service_mode = DL_CLDLS;
1294         bind_req->dl_conn_mgmt = 0;
1295         bind_req->dl_xidtest_flg = 0;
1296         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1297         get_msg(fd);
1298         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1299                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1300                 exit(STATE_UNKNOWN);
1301                 }
1302         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1303               bind_ack->dl_addr_length);
1304
1305         return 0;
1306         }
1307
1308 /***********************************************************************
1309  * interface:
1310  * function mac_addr_dlpi - get the mac address of the interface with
1311  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1312  *
1313  * parameter: addr: an array of six bytes, has to be allocated by the caller
1314  *
1315  * return: 0 if OK, -1 if the address could not be determined
1316  *
1317  *
1318  ***********************************************************************/
1319
1320 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1321         int fd;
1322         u_char mac_addr[25];
1323
1324         if(GOT_ERR != dl_open(dev, unit, &fd)){
1325                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1326                         bcopy( mac_addr, addr, 6);
1327                         return 0;
1328                         }
1329                 }
1330         close(fd);
1331
1332         return -1;
1333         }
1334
1335 /* Kompf 2000-2003 */
1336 #endif
1337
1338
1339 /* resolve host name or die (TODO: move this to netutils.c!) */
1340 void resolve_host(const char *in,struct in_addr *out){
1341         struct addrinfo hints, *ai;
1342
1343         memset(&hints,0,sizeof(hints));
1344         hints.ai_family=PF_INET;
1345         if (getaddrinfo(in,NULL,&hints,&ai) != 0)
1346                 usage_va(_("Invalid hostname/address - %s"),optarg);
1347
1348         memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out));
1349         freeaddrinfo(ai);
1350         }
1351
1352
1353 /* parse MAC address string, return 6 bytes (unterminated) or NULL */
1354 unsigned char *mac_aton(const char *string){
1355         static unsigned char result[6];
1356         char tmp[3];
1357         unsigned i, j;
1358
1359         for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
1360                 /* ignore ':' and any other non-hex character */
1361                 if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
1362                         continue;
1363                 tmp[0]=string[i];
1364                 tmp[1]=string[i+1];
1365                 tmp[2]='\0';
1366                 result[j]=strtol(tmp,(char **)NULL,16);
1367                 i++;
1368                 j++;
1369                 }
1370
1371         return (j==6) ? result : NULL;
1372         }
1373
1374
1375 void print_hardware_address(const unsigned char *address){
1376         int i;
1377
1378         printf(_("Hardware address: "));
1379         for (i=0; i<5; i++)
1380                 printf("%2.2x:", address[i]);
1381         printf("%2.2x", address[i]);
1382         putchar('\n');
1383         }
1384
1385
1386 /* print usage help */
1387 void print_help(void){
1388
1389         print_revision(progname,revision);
1390
1391         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1392         printf (COPYRIGHT, copyright, email);
1393
1394         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1395
1396   printf ("\n\n");
1397
1398         print_usage();
1399
1400         printf (_(UT_HELP_VRSN));
1401         printf (_(UT_EXTRA_OPTS));
1402
1403         printf (_(UT_VERBOSE));
1404
1405         printf (" %s\n", "-s, --serverip=IPADDRESS");
1406   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1407   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1408   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1409   printf (" %s\n", "-t, --timeout=INTEGER");
1410   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1411   printf (" %s\n", "-i, --interface=STRING");
1412   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1413   printf (" %s\n", "-m, --mac=STRING");
1414   printf ("    %s\n", _("MAC address to use in the DHCP request"));
1415   printf (" %s\n", "-u, --unicast");
1416   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
1417
1418 #ifdef NP_EXTRA_OPTS
1419   printf ("\n");
1420   printf ("%s\n", _("Notes:"));
1421   printf (_(UT_EXTRA_OPTS_NOTES));
1422 #endif
1423
1424   printf (_(UT_SUPPORT));
1425         return;
1426         }
1427
1428
1429 void
1430 print_usage(void){
1431
1432   printf (_("Usage:"));
1433   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
1434   printf ("                  [-i interface] [-m mac]\n");
1435
1436         return;
1437         }
1438
1439
1440