plugins-root/check_dhcp.c

   1 /******************************************************************************
   2 *
   3 * CHECK_DHCP.C
   4 *
   5 * Program: DHCP plugin for Nagios
   6 * License: GPL
   7 * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
   8 * Copyright (c) 2001-2006 Nagios Plugin Development Team
   9 *
  10 * License Information:
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of the GNU General Public License as published by
  14 * the Free Software Foundation; either version 2 of the License, or
  15 * (at your option) any later version.
  16 *
  17 * This program is distributed in the hope that it will be useful,
  18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 * GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 *
  26 * $Id$
  27 *
  28 *****************************************************************************/
  29
  30 const char *progname = "check_dhcp";
  31 const char *revision = "$Revision$";
  32 const char *copyright = "2001-2006";
  33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  34
  35 #include "common.h"
  36 #include "netutils.h"
  37 #include "utils.h"
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <errno.h>
  43 #include <unistd.h>
  44 #include <sys/time.h>
  45 #include <sys/ioctl.h>
  46 #include <fcntl.h>
  47 #include <getopt.h>
  48 #include <sys/socket.h>
  49 #include <sys/types.h>
  50 #include <netdb.h>
  51 #include <netinet/in.h>
  52 #include <net/if.h>
  53 #include <arpa/inet.h>
  54
  55 #if defined( __linux__ )
  56
  57 #include <linux/if_ether.h>
  58 #include <features.h>
  59
  60 #elif defined (__bsd__)
  61
  62 #include <netinet/if_ether.h>
  63 #include <sys/sysctl.h>
  64 #include <net/if_dl.h>
  65
  66 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
  67
  68 #define INSAP 22
  69 #define OUTSAP 24
  70
  71 #include <signal.h>
  72 #include <ctype.h>
  73 #include <sys/stropts.h>
  74 #include <sys/poll.h>
  75 #include <sys/dlpi.h>
  76
  77 #define bcopy(source, destination, length) memcpy(destination, source, length)
  78
  79 #define AREA_SZ 5000            /* buffer length in bytes */
  80 static u_long ctl_area[AREA_SZ];
  81 static u_long dat_area[AREA_SZ];
  82 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
  83 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
  84
  85 #define GOT_CTRL 1
  86 #define GOT_DATA 2
  87 #define GOT_BOTH 3
  88 #define GOT_INTR 4
  89 #define GOT_ERR 128
  90
  91 #define u_int8_t         uint8_t
  92 #define u_int16_t       uint16_t
  93 #define u_int32_t       uint32_t
  94
  95 static int get_msg(int);
  96 static int check_ctrl(int);
  97 static int put_ctrl(int, int, int);
  98 static int put_both(int, int, int, int);
  99 static int dl_open(const char *, int, int *);
 100 static int dl_bind(int, int, u_char *);
 101 long mac_addr_dlpi( const char *, int, u_char *);
 102
 103 #endif
 104
 105
 106
 107 /**** Common definitions ****/
 108
 109 #define OK                0
 110 #define ERROR             -1
 111
 112 #define FALSE             0
 113 #define TRUE              1
 114
 115
 116 /**** DHCP definitions ****/
 117
 118 #define MAX_DHCP_CHADDR_LENGTH           16
 119 #define MAX_DHCP_SNAME_LENGTH            64
 120 #define MAX_DHCP_FILE_LENGTH             128
 121 #define MAX_DHCP_OPTIONS_LENGTH          312
 122
 123
 124 typedef struct dhcp_packet_struct{
 125         u_int8_t  op;                   /* packet type */
 126         u_int8_t  htype;                /* type of hardware address for this machine (Ethernet, etc) */
 127         u_int8_t  hlen;                 /* length of hardware address (of this machine) */
 128         u_int8_t  hops;                 /* hops */
 129         u_int32_t xid;                  /* random transaction id number - chosen by this machine */
 130         u_int16_t secs;                 /* seconds used in timing */
 131         u_int16_t flags;                /* flags */
 132         struct in_addr ciaddr;          /* IP address of this machine (if we already have one) */
 133         struct in_addr yiaddr;          /* IP address of this machine (offered by the DHCP server) */
 134         struct in_addr siaddr;          /* IP address of DHCP server */
 135         struct in_addr giaddr;          /* IP address of DHCP relay */
 136         unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH];      /* hardware address of this machine */
 137         char sname [MAX_DHCP_SNAME_LENGTH];    /* name of DHCP server */
 138         char file [MAX_DHCP_FILE_LENGTH];      /* boot file name (used for diskless booting?) */
 139         char options[MAX_DHCP_OPTIONS_LENGTH];  /* options */
 140         }dhcp_packet;
 141
 142
 143 typedef struct dhcp_offer_struct{
 144         struct in_addr server_address;   /* address of DHCP server that sent this offer */
 145         struct in_addr offered_address;  /* the IP address that was offered to us */
 146         u_int32_t lease_time;            /* lease time in seconds */
 147         u_int32_t renewal_time;          /* renewal time in seconds */
 148         u_int32_t rebinding_time;        /* rebinding time in seconds */
 149         struct dhcp_offer_struct *next;
 150         }dhcp_offer;
 151
 152
 153 typedef struct requested_server_struct{
 154         struct in_addr server_address;
 155         int answered;
 156         struct requested_server_struct *next;
 157         }requested_server;
 158
 159
 160 #define BOOTREQUEST     1
 161 #define BOOTREPLY       2
 162
 163 #define DHCPDISCOVER    1
 164 #define DHCPOFFER       2
 165 #define DHCPREQUEST     3
 166 #define DHCPDECLINE     4
 167 #define DHCPACK         5
 168 #define DHCPNACK        6
 169 #define DHCPRELEASE     7
 170
 171 #define DHCP_OPTION_MESSAGE_TYPE        53
 172 #define DHCP_OPTION_HOST_NAME           12
 173 #define DHCP_OPTION_BROADCAST_ADDRESS   28
 174 #define DHCP_OPTION_REQUESTED_ADDRESS   50
 175 #define DHCP_OPTION_LEASE_TIME          51
 176 #define DHCP_OPTION_RENEWAL_TIME        58
 177 #define DHCP_OPTION_REBINDING_TIME      59
 178
 179 #define DHCP_INFINITE_TIME              0xFFFFFFFF
 180
 181 #define DHCP_BROADCAST_FLAG 32768
 182
 183 #define DHCP_SERVER_PORT   67
 184 #define DHCP_CLIENT_PORT   68
 185
 186 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 187 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 188
 189 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 190
 191 char network_interface_name[IFNAMSIZ]="eth0";
 192
 193 u_int32_t packet_xid=0;
 194
 195 u_int32_t dhcp_lease_time=0;
 196 u_int32_t dhcp_renewal_time=0;
 197 u_int32_t dhcp_rebinding_time=0;
 198
 199 int dhcpoffer_timeout=2;
 200
 201 dhcp_offer *dhcp_offer_list=NULL;
 202 requested_server *requested_server_list=NULL;
 203
 204 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 205 int requested_servers=0;
 206 int requested_responses=0;
 207
 208 int request_specific_address=FALSE;
 209 int received_requested_address=FALSE;
 210 int verbose=0;
 211 struct in_addr requested_address;
 212
 213
 214 int process_arguments(int, char **);
 215 int call_getopt(int, char **);
 216 int validate_arguments(void);
 217 void print_usage(void);
 218 void print_help(void);
 219
 220 int get_hardware_address(int,char *);
 221
 222 int send_dhcp_discover(int);
 223 int get_dhcp_offer(int);
 224
 225 int get_results(void);
 226
 227 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 228 int free_dhcp_offer_list(void);
 229 int free_requested_server_list(void);
 230
 231 int create_dhcp_socket(void);
 232 int close_dhcp_socket(int);
 233 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 234 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 235
 236
 237
 238 int main(int argc, char **argv){
 239         int dhcp_socket;
 240         int result = STATE_UNKNOWN;
 241
 242         setlocale (LC_ALL, "");
 243         bindtextdomain (PACKAGE, LOCALEDIR);
 244         textdomain (PACKAGE);
 245
 246         if(process_arguments(argc,argv)!=OK){
 247                 usage4 (_("Could not parse arguments"));
 248                 }
 249
 250         /* create socket for DHCP communications */
 251         dhcp_socket=create_dhcp_socket();
 252
 253         /* get hardware address of client machine */
 254         get_hardware_address(dhcp_socket,network_interface_name);
 255
 256         /* send DHCPDISCOVER packet */
 257         send_dhcp_discover(dhcp_socket);
 258
 259         /* wait for a DHCPOFFER packet */
 260         get_dhcp_offer(dhcp_socket);
 261
 262         /* close socket we created */
 263         close_dhcp_socket(dhcp_socket);
 264
 265         /* determine state/plugin output to return */
 266         result=get_results();
 267
 268         /* free allocated memory */
 269         free_dhcp_offer_list();
 270         free_requested_server_list();
 271
 272         return result;
 273         }
 274
 275
 276
 277 /* determines hardware address on client machine */
 278 int get_hardware_address(int sock,char *interface_name){
 279
 280         int i;
 281
 282 #if defined(__linux__)
 283         struct ifreq ifr;
 284
 285         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
 286
 287         /* try and grab hardware address of requested interface */
 288         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 289                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 290                 exit(STATE_UNKNOWN);
 291                 }
 292
 293         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 294
 295 #elif defined(__bsd__)
 296                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 297
 298         int                     mib[6], len;
 299         char                    *buf;
 300         unsigned char           *ptr;
 301         struct if_msghdr        *ifm;
 302         struct sockaddr_dl      *sdl;
 303
 304         mib[0] = CTL_NET;
 305         mib[1] = AF_ROUTE;
 306         mib[2] = 0;
 307         mib[3] = AF_LINK;
 308         mib[4] = NET_RT_IFLIST;
 309
 310         if((mib[5] = if_nametoindex(interface_name)) == 0){
 311                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 312                 exit(STATE_UNKNOWN);
 313                 }
 314
 315         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 316                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 317                 exit(STATE_UNKNOWN);
 318                 }
 319
 320         if((buf = malloc(len)) == NULL){
 321                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 322                 exit(4);
 323                 }
 324
 325         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 326                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 327                 exit(STATE_UNKNOWN);
 328                 }
 329
 330         ifm = (struct if_msghdr *)buf;
 331         sdl = (struct sockaddr_dl *)(ifm + 1);
 332         ptr = (unsigned char *)LLADDR(sdl);
 333         memcpy(&client_hardware_address[0], ptr, 6) ;
 334                                                 /* King 2004 */
 335
 336 #elif defined(__sun__) || defined(__solaris__)
 337
 338                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 339         long stat;
 340         char dev[20] = "/dev/";
 341         char *p;
 342         int unit;
 343
 344         for(p = interface_name; *p && isalpha(*p); p++)
 345                 /* no-op */ ;
 346         if( p != '\0' ){
 347                 unit = atoi(p) ;
 348                 *p = '\0' ;
 349                 strncat(dev, interface_name, 6) ;
 350                 }
 351         else{
 352                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 353                 exit(STATE_UNKNOWN);
 354                 }
 355         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 356         if(stat != 0){
 357                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 358                 exit(STATE_UNKNOWN);
 359                 }
 360
 361 #elif defined(__hpux__)
 362
 363         long stat;
 364         char dev[20] = "/dev/dlpi" ;
 365         int unit = 0;
 366
 367         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 368         if(stat != 0){
 369                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 370                 exit(STATE_UNKNOWN);
 371                 }
 372                                                 /* Kompf 2000-2003 */
 373
 374 #else
 375         printf(_("Error: can't get MAC address for this architecture.\n"));
 376         exit(STATE_UNKNOWN);
 377 #endif
 378
 379         if(verbose){
 380                 printf(_("Hardware address: "));
 381                 for (i=0; i<6; ++i)
 382                         printf("%2.2x", client_hardware_address[i]);
 383                 printf( "\n");
 384                 }
 385
 386         return OK;
 387         }
 388
 389
 390 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 391 int send_dhcp_discover(int sock){
 392         dhcp_packet discover_packet;
 393         struct sockaddr_in sockaddr_broadcast;
 394
 395
 396         /* clear the packet data structure */
 397         bzero(&discover_packet,sizeof(discover_packet));
 398
 399
 400         /* boot request flag (backward compatible with BOOTP servers) */
 401         discover_packet.op=BOOTREQUEST;
 402
 403         /* hardware address type */
 404         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 405
 406         /* length of our hardware address */
 407         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 408
 409         discover_packet.hops=0;
 410
 411         /* transaction id is supposed to be random */
 412         srand(time(NULL));
 413         packet_xid=random();
 414         discover_packet.xid=htonl(packet_xid);
 415
 416         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 417         /* downright bizzarre... */
 418         ntohl(discover_packet.xid);
 419
 420         /*discover_packet.secs=htons(65535);*/
 421         discover_packet.secs=0xFF;
 422
 423         /* tell server it should broadcast its response */
 424         discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
 425
 426         /* our hardware address */
 427         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 428
 429         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 430         discover_packet.options[0]='\x63';
 431         discover_packet.options[1]='\x82';
 432         discover_packet.options[2]='\x53';
 433         discover_packet.options[3]='\x63';
 434
 435         /* DHCP message type is embedded in options field */
 436         discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 437         discover_packet.options[5]='\x01';               /* DHCP message option length in bytes */
 438         discover_packet.options[6]=DHCPDISCOVER;
 439
 440         /* the IP address we're requesting */
 441         if(request_specific_address==TRUE){
 442                 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
 443                 discover_packet.options[8]='\x04';
 444                 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
 445                 }
 446
 447         /* send the DHCPDISCOVER packet to broadcast address */
 448         sockaddr_broadcast.sin_family=AF_INET;
 449         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 450         sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
 451         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 452
 453
 454         if(verbose){
 455                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 456                 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 457                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 458                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 459                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 460                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 461                 }
 462
 463         /* send the DHCPDISCOVER packet out */
 464         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 465
 466         if(verbose)
 467                 printf("\n\n");
 468
 469         return OK;
 470         }
 471
 472
 473
 474
 475 /* waits for a DHCPOFFER message from one or more DHCP servers */
 476 int get_dhcp_offer(int sock){
 477         dhcp_packet offer_packet;
 478         struct sockaddr_in source;
 479         struct sockaddr_in via;
 480         int result=OK;
 481         int timeout=1;
 482         int responses=0;
 483         int x;
 484         time_t start_time;
 485         time_t current_time;
 486
 487         time(&start_time);
 488
 489         /* receive as many responses as we can */
 490         for(responses=0,valid_responses=0;;){
 491
 492                 time(&current_time);
 493                 if((current_time-start_time)>=dhcpoffer_timeout)
 494                         break;
 495
 496                 if(verbose)
 497                         printf("\n\n");
 498
 499                 bzero(&source,sizeof(source));
 500                 bzero(&via,sizeof(via));
 501                 bzero(&offer_packet,sizeof(offer_packet));
 502
 503                 result=OK;
 504                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 505
 506                 if(result!=OK){
 507                         if(verbose)
 508                                 printf(_("Result=ERROR\n"));
 509
 510                         continue;
 511                         }
 512                 else{
 513                         if(verbose)
 514                                 printf(_("Result=OK\n"));
 515
 516                         responses++;
 517                         }
 518
 519                 /* The "source" is either a server or a relay. */
 520                 /* Save a copy of "source" into "via" even if it's via itself */
 521                 memcpy(&via,&source,sizeof(source)) ;
 522
 523                 /* If siaddr is non-zero, set "source" to siaddr */
 524                 if(offer_packet.siaddr.s_addr != 0L){
 525                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 526                         }
 527
 528                 if(verbose){
 529                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 530                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 531                         printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 532                         }
 533
 534                 /* check packet xid to see if its the same as the one we used in the discover packet */
 535                 if(ntohl(offer_packet.xid)!=packet_xid){
 536                         if(verbose)
 537                                 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 538
 539                         continue;
 540                         }
 541
 542                 /* check hardware address */
 543                 result=OK;
 544                 if(verbose)
 545                         printf("DHCPOFFER chaddr: ");
 546
 547                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 548                         if(verbose)
 549                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 550
 551                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 552                                 result=ERROR;
 553                         }
 554                 if(verbose)
 555                         printf("\n");
 556
 557                 if(result==ERROR){
 558                         if(verbose)
 559                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 560
 561                         continue;
 562                         }
 563
 564                 if(verbose){
 565                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 566                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 567                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 568                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 569                         }
 570
 571                 add_dhcp_offer(source.sin_addr,&offer_packet);
 572
 573                 valid_responses++;
 574                 }
 575
 576         if(verbose){
 577                 printf(_("Total responses seen on the wire: %d\n"),responses);
 578                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 579                 }
 580
 581         return OK;
 582         }
 583
 584
 585
 586 /* sends a DHCP packet */
 587 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 588         struct sockaddr_in myname;
 589         int result;
 590
 591         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 592
 593         if(verbose)
 594                 printf(_("send_dhcp_packet result: %d\n"),result);
 595
 596         if(result<0)
 597                 return ERROR;
 598
 599         return OK;
 600         }
 601
 602
 603
 604 /* receives a DHCP packet */
 605 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 606         struct timeval tv;
 607         fd_set readfds;
 608         int recv_result;
 609         socklen_t address_size;
 610         struct sockaddr_in source_address;
 611
 612
 613         /* wait for data to arrive (up time timeout) */
 614         tv.tv_sec=timeout;
 615         tv.tv_usec=0;
 616         FD_ZERO(&readfds);
 617         FD_SET(sock,&readfds);
 618         select(sock+1,&readfds,NULL,NULL,&tv);
 619
 620         /* make sure some data has arrived */
 621         if(!FD_ISSET(sock,&readfds)){
 622                 if(verbose)
 623                         printf(_("No (more) data received\n"));
 624                 return ERROR;
 625                 }
 626
 627         else{
 628
 629                 /* 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
 630                    not being interpreted correctly.  sigh... */
 631                 bzero(&source_address,sizeof(source_address));
 632                 address_size=sizeof(source_address);
 633                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 634                 if(verbose)
 635                         printf("recv_result_1: %d\n",recv_result);
 636                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 637                 if(verbose)
 638                         printf("recv_result_2: %d\n",recv_result);
 639
 640                 if(recv_result==-1){
 641                         if(verbose){
 642                                 printf(_("recvfrom() failed, "));
 643                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 644                                 }
 645                         return ERROR;
 646                         }
 647                 else{
 648                         if(verbose){
 649                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 650                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 651                                 }
 652
 653                         memcpy(address,&source_address,sizeof(source_address));
 654                         return OK;
 655                         }
 656                 }
 657
 658         return OK;
 659         }
 660
 661
 662 /* creates a socket for DHCP communication */
 663 int create_dhcp_socket(void){
 664         struct sockaddr_in myname;
 665         struct ifreq interface;
 666         int sock;
 667         int flag=1;
 668
 669         /* Set up the address we're going to bind to. */
 670         bzero(&myname,sizeof(myname));
 671         myname.sin_family=AF_INET;
 672         myname.sin_port=htons(DHCP_CLIENT_PORT);
 673         myname.sin_addr.s_addr=INADDR_ANY;                 /* listen on any address */
 674         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 675
 676         /* create a socket for DHCP communications */
 677         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 678         if(sock<0){
 679                 printf(_("Error: Could not create socket!\n"));
 680                 exit(STATE_UNKNOWN);
 681                 }
 682
 683         if(verbose)
 684                 printf("DHCP socket: %d\n",sock);
 685
 686         /* set the reuse address flag so we don't get errors when restarting */
 687         flag=1;
 688         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 689                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 690                 exit(STATE_UNKNOWN);
 691                 }
 692
 693         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 694         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 695                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 696                 exit(STATE_UNKNOWN);
 697                 }
 698
 699         /* bind socket to interface */
 700 #if defined(__linux__)
 701         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
 702         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 703                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 704                 exit(STATE_UNKNOWN);
 705                 }
 706
 707 #else
 708         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
 709 #endif
 710
 711         /* bind the socket */
 712         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 713                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 714                 exit(STATE_UNKNOWN);
 715                 }
 716
 717         return sock;
 718         }
 719
 720
 721 /* closes DHCP socket */
 722 int close_dhcp_socket(int sock){
 723
 724         close(sock);
 725
 726         return OK;
 727         }
 728
 729
 730 /* adds a requested server address to list in memory */
 731 int add_requested_server(struct in_addr server_address){
 732         requested_server *new_server;
 733
 734         new_server=(requested_server *)malloc(sizeof(requested_server));
 735         if(new_server==NULL)
 736                 return ERROR;
 737
 738         new_server->server_address=server_address;
 739         new_server->answered=FALSE;
 740
 741         new_server->next=requested_server_list;
 742         requested_server_list=new_server;
 743
 744         requested_servers++;
 745
 746         if(verbose)
 747                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 748
 749         return OK;
 750         }
 751
 752
 753
 754
 755 /* adds a DHCP OFFER to list in memory */
 756 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 757         dhcp_offer *new_offer;
 758         int x;
 759         int y;
 760         unsigned option_type;
 761         unsigned option_length;
 762
 763         if(offer_packet==NULL)
 764                 return ERROR;
 765
 766         /* process all DHCP options present in the packet */
 767         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 768
 769                 /* end of options (0 is really just a pad, but bail out anyway) */
 770                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 771                         break;
 772
 773                 /* get option type */
 774                 option_type=offer_packet->options[x++];
 775
 776                 /* get option length */
 777                 option_length=offer_packet->options[x++];
 778
 779                 if(verbose)
 780                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 781
 782                 /* get option data */
 783                 if(option_type==DHCP_OPTION_LEASE_TIME){
 784                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 785                         dhcp_lease_time = ntohl(dhcp_lease_time);
 786                         }
 787                 if(option_type==DHCP_OPTION_RENEWAL_TIME){
 788                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 789                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 790                         }
 791                 if(option_type==DHCP_OPTION_REBINDING_TIME){
 792                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 793                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 794                         }
 795
 796                 /* skip option data we're ignoring */
 797                 else
 798                         for(y=0;y<option_length;y++,x++);
 799                 }
 800
 801         if(verbose){
 802                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 803                         printf(_("Lease Time: Infinite\n"));
 804                 else
 805                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 806                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 807                         printf(_("Renewal Time: Infinite\n"));
 808                 else
 809                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 810                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 811                         printf(_("Rebinding Time: Infinite\n"));
 812                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 813                 }
 814
 815         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 816
 817         if(new_offer==NULL)
 818                 return ERROR;
 819
 820         new_offer->server_address=source;
 821         new_offer->offered_address=offer_packet->yiaddr;
 822         new_offer->lease_time=dhcp_lease_time;
 823         new_offer->renewal_time=dhcp_renewal_time;
 824         new_offer->rebinding_time=dhcp_rebinding_time;
 825
 826
 827         if(verbose){
 828                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 829                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 830                 }
 831
 832         /* add new offer to head of list */
 833         new_offer->next=dhcp_offer_list;
 834         dhcp_offer_list=new_offer;
 835
 836         return OK;
 837         }
 838
 839
 840 /* frees memory allocated to DHCP OFFER list */
 841 int free_dhcp_offer_list(void){
 842         dhcp_offer *this_offer;
 843         dhcp_offer *next_offer;
 844
 845         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 846                 next_offer=this_offer->next;
 847                 free(this_offer);
 848                 }
 849
 850         return OK;
 851         }
 852
 853
 854 /* frees memory allocated to requested server list */
 855 int free_requested_server_list(void){
 856         requested_server *this_server;
 857         requested_server *next_server;
 858
 859         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 860                 next_server=this_server->next;
 861                 free(this_server);
 862                 }
 863
 864         return OK;
 865         }
 866
 867
 868 /* gets state and plugin output to return */
 869 int get_results(void){
 870         dhcp_offer *temp_offer;
 871         requested_server *temp_server;
 872         int result;
 873         u_int32_t max_lease_time=0;
 874
 875         received_requested_address=FALSE;
 876
 877         /* checks responses from requested servers */
 878         requested_responses=0;
 879         if(requested_servers>0){
 880
 881                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 882
 883                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 884
 885                                 /* get max lease time we were offered */
 886                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 887                                         max_lease_time=temp_offer->lease_time;
 888
 889                                 /* see if we got the address we requested */
 890                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 891                                         received_requested_address=TRUE;
 892
 893                                 /* see if the servers we wanted a response from talked to us or not */
 894                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 895                                         if(verbose){
 896                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 897                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 898                                                 if(temp_server->answered)
 899                                                         printf(_(" (duplicate)"));
 900                                                 printf(_("\n"));
 901                                                 }
 902                                         if(temp_server->answered == FALSE){
 903                                                 requested_responses++;
 904                                                 temp_server->answered=TRUE;
 905                                                 }
 906                                         }
 907                                 }
 908                         }
 909
 910                 }
 911
 912         /* else check and see if we got our requested address from any server */
 913         else{
 914
 915                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 916
 917                         /* get max lease time we were offered */
 918                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 919                                 max_lease_time=temp_offer->lease_time;
 920
 921                         /* see if we got the address we requested */
 922                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 923                                 received_requested_address=TRUE;
 924                         }
 925                 }
 926
 927         result=STATE_OK;
 928         if(valid_responses==0)
 929                 result=STATE_CRITICAL;
 930         else if(requested_servers>0 && requested_responses==0)
 931                 result=STATE_CRITICAL;
 932         else if(requested_responses<requested_servers)
 933                 result=STATE_WARNING;
 934         else if(request_specific_address==TRUE && received_requested_address==FALSE)
 935                 result=STATE_WARNING;
 936
 937         if(result==0)               /* garrett honeycutt 2005 */
 938                 printf("OK: ");
 939         else if(result==1)
 940                 printf("WARNING: ");
 941         else if(result==2)
 942                 printf("CRITICAL: ");
 943         else if(result==3)
 944                 printf("UNKNOWN: ");
 945
 946         /* we didn't receive any DHCPOFFERs */
 947         if(dhcp_offer_list==NULL){
 948                 printf(_("No DHCPOFFERs were received.\n"));
 949                 return result;
 950                 }
 951
 952         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
 953
 954         if(requested_servers>0)
 955                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
 956
 957         if(request_specific_address==TRUE)
 958                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
 959
 960         printf(_(", max lease time = "));
 961         if(max_lease_time==DHCP_INFINITE_TIME)
 962                 printf(_("Infinity"));
 963         else
 964                 printf("%lu sec",(unsigned long)max_lease_time);
 965
 966         printf(".\n");
 967
 968         return result;
 969         }
 970
 971
 972 /* process command-line arguments */
 973 int process_arguments(int argc, char **argv){
 974         int c;
 975
 976         if(argc<1)
 977                 return ERROR;
 978
 979         c=0;
 980         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
 981
 982                 /*
 983                 if(is_option(argv[c]))
 984                         continue;
 985                 */
 986                 }
 987
 988         return validate_arguments();
 989         }
 990
 991
 992
 993 int call_getopt(int argc, char **argv){
 994         int c=0;
 995         int i=0;
 996         struct in_addr ipaddress;
 997
 998         int option_index = 0;
 999         static struct option long_options[] =
1000         {
1001                 {"serverip",       required_argument,0,'s'},
1002                 {"requestedip",    required_argument,0,'r'},
1003                 {"timeout",        required_argument,0,'t'},
1004                 {"interface",      required_argument,0,'i'},
1005                 {"verbose",        no_argument,      0,'v'},
1006                 {"version",        no_argument,      0,'V'},
1007                 {"help",           no_argument,      0,'h'},
1008                 {0,0,0,0}
1009         };
1010
1011         while(1){
1012                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1013
1014                 i++;
1015
1016                 if(c==-1||c==EOF||c==1)
1017                         break;
1018
1019                 switch(c){
1020                 case 'w':
1021                 case 'r':
1022                 case 't':
1023                 case 'i':
1024                         i++;
1025                         break;
1026                 default:
1027                         break;
1028                         }
1029
1030                 switch(c){
1031
1032                 case 's': /* DHCP server address */
1033                         if(inet_aton(optarg,&ipaddress))
1034                                 add_requested_server(ipaddress);
1035                         /*
1036                         else
1037                                 usage("Invalid server IP address\n");
1038                         */
1039                         break;
1040
1041                 case 'r': /* address we are requested from DHCP servers */
1042                         if(inet_aton(optarg,&ipaddress)){
1043                                 requested_address=ipaddress;
1044                                 request_specific_address=TRUE;
1045                                 }
1046                         /*
1047                         else
1048                                 usage("Invalid requested IP address\n");
1049                         */
1050                         break;
1051
1052                 case 't': /* timeout */
1053
1054                         /*
1055                         if(is_intnonneg(optarg))
1056                         */
1057                         if(atoi(optarg)>0)
1058                                 dhcpoffer_timeout=atoi(optarg);
1059                         /*
1060                         else
1061                                 usage("Time interval must be a nonnegative integer\n");
1062                         */
1063                         break;
1064
1065                 case 'i': /* interface name */
1066
1067                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1068                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1069
1070                         break;
1071
1072                 case 'V': /* version */
1073                         print_revision(progname,revision);
1074                         exit(STATE_OK);
1075
1076                 case 'h': /* help */
1077                         print_help();
1078                         exit(STATE_OK);
1079
1080                 case 'v': /* verbose */
1081                         verbose=1;
1082                         break;
1083
1084                 case '?': /* help */
1085                         usage2 (_("Unknown argument"), optarg);
1086                         break;
1087
1088                 default:
1089                         break;
1090                         }
1091                 }
1092
1093         return i;
1094         }
1095
1096
1097 int validate_arguments(void){
1098
1099         return OK;
1100         }
1101
1102
1103 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1104 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1105
1106 /* get a message from a stream; return type of message */
1107 static int get_msg(int fd){
1108         int flags = 0;
1109         int res, ret;
1110         ctl_area[0] = 0;
1111         dat_area[0] = 0;
1112         ret = 0;
1113         res = getmsg(fd, &ctl, &dat, &flags);
1114
1115         if(res < 0){
1116                 if(errno == EINTR){
1117                         return(GOT_INTR);
1118                         }
1119                 else{
1120                         printf("%s\n", "get_msg FAILED.");
1121                         return(GOT_ERR);
1122                         }
1123                 }
1124         if(ctl.len > 0){
1125                 ret |= GOT_CTRL;
1126                 }
1127         if(dat.len > 0){
1128                 ret |= GOT_DATA;
1129                 }
1130
1131         return(ret);
1132         }
1133
1134 /* verify that dl_primitive in ctl_area = prim */
1135 static int check_ctrl(int prim){
1136         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1137
1138         if(err_ack->dl_primitive != prim){
1139                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1140                 exit(STATE_UNKNOWN);
1141                 }
1142
1143         return 0;
1144         }
1145
1146 /* put a control message on a stream */
1147 static int put_ctrl(int fd, int len, int pri){
1148
1149         ctl.len = len;
1150         if(putmsg(fd, &ctl, 0, pri) < 0){
1151                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1152                 exit(STATE_UNKNOWN);
1153                 }
1154
1155         return  0;
1156         }
1157
1158 /* put a control + data message on a stream */
1159 static int put_both(int fd, int clen, int dlen, int pri){
1160
1161         ctl.len = clen;
1162         dat.len = dlen;
1163         if(putmsg(fd, &ctl, &dat, pri) < 0){
1164                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1165                 exit(STATE_UNKNOWN);
1166                 }
1167
1168         return  0;
1169         }
1170
1171 /* open file descriptor and attach */
1172 static int dl_open(const char *dev, int unit, int *fd){
1173         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1174
1175         if((*fd = open(dev, O_RDWR)) == -1){
1176                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1177                 exit(STATE_UNKNOWN);
1178                 }
1179         attach_req->dl_primitive = DL_ATTACH_REQ;
1180         attach_req->dl_ppa = unit;
1181         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1182         get_msg(*fd);
1183         return check_ctrl(DL_OK_ACK);
1184         }
1185
1186 /* send DL_BIND_REQ */
1187 static int dl_bind(int fd, int sap, u_char *addr){
1188         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1189         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1190
1191         bind_req->dl_primitive = DL_BIND_REQ;
1192         bind_req->dl_sap = sap;
1193         bind_req->dl_max_conind = 1;
1194         bind_req->dl_service_mode = DL_CLDLS;
1195         bind_req->dl_conn_mgmt = 0;
1196         bind_req->dl_xidtest_flg = 0;
1197         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1198         get_msg(fd);
1199         if GOT_ERR == check_ctrl(DL_BIND_ACK)){
1200                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1201                 exit(STATE_UNKNOWN);
1202                 }
1203         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1204               bind_ack->dl_addr_length);
1205
1206         return 0;
1207         }
1208
1209 /***********************************************************************
1210  * interface:
1211  * function mac_addr_dlpi - get the mac address of the interface with
1212  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1213  *
1214  * parameter: addr: an array of six bytes, has to be allocated by the caller
1215  *
1216  * return: 0 if OK, -1 if the address could not be determined
1217  *
1218  *
1219  ***********************************************************************/
1220
1221 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1222         int fd;
1223         u_char mac_addr[25];
1224
1225         if(GOT_ERR != dl_open(dev, unit, &fd)){
1226                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1227                         bcopy( mac_addr, addr, 6);
1228                         return 0;
1229                         }
1230                 }
1231         close(fd);
1232
1233         return -1;
1234         }
1235
1236 /* Kompf 2000-2003 */
1237 #endif
1238
1239
1240 /* print usage help */
1241 void print_help(void){
1242
1243         print_revision(progname,revision);
1244
1245         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1246         printf (COPYRIGHT, copyright, email);
1247
1248         printf(_("This plugin tests the availability of DHCP servers on a network.\n\n"));
1249
1250         print_usage();
1251
1252         printf (_(UT_HELP_VRSN));
1253
1254         printf (_(UT_VERBOSE));
1255
1256         printf(_("\
1257  -s, --serverip=IPADDRESS\n\
1258    IP address of DHCP server that we must hear from\n\
1259  -r, --requestedip=IPADDRESS\n\
1260    IP address that should be offered by at least one DHCP server\n\
1261  -t, --timeout=INTEGER\n\
1262    Seconds to wait for DHCPOFFER before timeout occurs\n\
1263  -i, --interface=STRING\n\
1264    Interface to to use for listening (i.e. eth0)\n"));
1265
1266         return;
1267         }
1268
1269
1270 void print_usage(void){
1271         printf("\
1272 Usage: %s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1273
1274         return;
1275         }
1276
1277
1278