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) 2001-2006 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 *
  18 * License Information:
  19 *
  20 * This program is free software; you can redistribute it and/or modify
  21 * it under the terms of the GNU General Public License as published by
  22 * the Free Software Foundation; either version 2 of the License, or
  23 * (at your option) any later version.
  24 *
  25 * This program is distributed in the hope that it will be useful,
  26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28 * GNU General Public License for more details.
  29 *
  30 * You should have received a copy of the GNU General Public License
  31 * along with this program; if not, write to the Free Software
  32 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  33 *
  34 * $Id$
  35 *
  36 *****************************************************************************/
  37
  38 const char *progname = "check_dhcp";
  39 const char *revision = "$Revision$";
  40 const char *copyright = "2001-2006";
  41 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  42
  43 #include "common.h"
  44 #include "netutils.h"
  45 #include "utils.h"
  46
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <errno.h>
  51 #include <unistd.h>
  52 #include <sys/time.h>
  53 #include <sys/ioctl.h>
  54 #include <fcntl.h>
  55 #include <getopt.h>
  56 #include <sys/socket.h>
  57 #include <sys/types.h>
  58 #include <netdb.h>
  59 #include <netinet/in.h>
  60 #include <net/if.h>
  61 #include <arpa/inet.h>
  62
  63 #if defined( __linux__ )
  64
  65 #include <linux/if_ether.h>
  66 #include <features.h>
  67
  68 #elif defined (__bsd__)
  69
  70 #include <netinet/if_ether.h>
  71 #include <sys/param.h>
  72 #include <sys/sysctl.h>
  73 #include <net/if_dl.h>
  74
  75 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
  76
  77 #define INSAP 22
  78 #define OUTSAP 24
  79
  80 #include <signal.h>
  81 #include <ctype.h>
  82 #include <sys/stropts.h>
  83 #include <sys/poll.h>
  84 #include <sys/dlpi.h>
  85
  86 #define bcopy(source, destination, length) memcpy(destination, source, length)
  87
  88 #define AREA_SZ 5000            /* buffer length in bytes */
  89 static u_long ctl_area[AREA_SZ];
  90 static u_long dat_area[AREA_SZ];
  91 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
  92 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
  93
  94 #define GOT_CTRL 1
  95 #define GOT_DATA 2
  96 #define GOT_BOTH 3
  97 #define GOT_INTR 4
  98 #define GOT_ERR 128
  99
 100 #define u_int8_t         uint8_t
 101 #define u_int16_t       uint16_t
 102 #define u_int32_t       uint32_t
 103
 104 static int get_msg(int);
 105 static int check_ctrl(int);
 106 static int put_ctrl(int, int, int);
 107 static int put_both(int, int, int, int);
 108 static int dl_open(const char *, int, int *);
 109 static int dl_bind(int, int, u_char *);
 110 long mac_addr_dlpi( const char *, int, u_char *);
 111
 112 #endif
 113
 114
 115
 116 /**** Common definitions ****/
 117
 118 #define OK                0
 119 #define ERROR             -1
 120
 121 #define FALSE             0
 122 #define TRUE              1
 123
 124
 125 /**** DHCP definitions ****/
 126
 127 #define MAX_DHCP_CHADDR_LENGTH           16
 128 #define MAX_DHCP_SNAME_LENGTH            64
 129 #define MAX_DHCP_FILE_LENGTH             128
 130 #define MAX_DHCP_OPTIONS_LENGTH          312
 131
 132
 133 typedef struct dhcp_packet_struct{
 134         u_int8_t  op;                   /* packet type */
 135         u_int8_t  htype;                /* type of hardware address for this machine (Ethernet, etc) */
 136         u_int8_t  hlen;                 /* length of hardware address (of this machine) */
 137         u_int8_t  hops;                 /* hops */
 138         u_int32_t xid;                  /* random transaction id number - chosen by this machine */
 139         u_int16_t secs;                 /* seconds used in timing */
 140         u_int16_t flags;                /* flags */
 141         struct in_addr ciaddr;          /* IP address of this machine (if we already have one) */
 142         struct in_addr yiaddr;          /* IP address of this machine (offered by the DHCP server) */
 143         struct in_addr siaddr;          /* IP address of DHCP server */
 144         struct in_addr giaddr;          /* IP address of DHCP relay */
 145         unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH];      /* hardware address of this machine */
 146         char sname [MAX_DHCP_SNAME_LENGTH];    /* name of DHCP server */
 147         char file [MAX_DHCP_FILE_LENGTH];      /* boot file name (used for diskless booting?) */
 148         char options[MAX_DHCP_OPTIONS_LENGTH];  /* options */
 149         }dhcp_packet;
 150
 151
 152 typedef struct dhcp_offer_struct{
 153         struct in_addr server_address;   /* address of DHCP server that sent this offer */
 154         struct in_addr offered_address;  /* the IP address that was offered to us */
 155         u_int32_t lease_time;            /* lease time in seconds */
 156         u_int32_t renewal_time;          /* renewal time in seconds */
 157         u_int32_t rebinding_time;        /* rebinding time in seconds */
 158         struct dhcp_offer_struct *next;
 159         }dhcp_offer;
 160
 161
 162 typedef struct requested_server_struct{
 163         struct in_addr server_address;
 164         int answered;
 165         struct requested_server_struct *next;
 166         }requested_server;
 167
 168
 169 #define BOOTREQUEST     1
 170 #define BOOTREPLY       2
 171
 172 #define DHCPDISCOVER    1
 173 #define DHCPOFFER       2
 174 #define DHCPREQUEST     3
 175 #define DHCPDECLINE     4
 176 #define DHCPACK         5
 177 #define DHCPNACK        6
 178 #define DHCPRELEASE     7
 179
 180 #define DHCP_OPTION_MESSAGE_TYPE        53
 181 #define DHCP_OPTION_HOST_NAME           12
 182 #define DHCP_OPTION_BROADCAST_ADDRESS   28
 183 #define DHCP_OPTION_REQUESTED_ADDRESS   50
 184 #define DHCP_OPTION_LEASE_TIME          51
 185 #define DHCP_OPTION_RENEWAL_TIME        58
 186 #define DHCP_OPTION_REBINDING_TIME      59
 187
 188 #define DHCP_INFINITE_TIME              0xFFFFFFFF
 189
 190 #define DHCP_BROADCAST_FLAG 32768
 191
 192 #define DHCP_SERVER_PORT   67
 193 #define DHCP_CLIENT_PORT   68
 194
 195 #define ETHERNET_HARDWARE_ADDRESS            1     /* used in htype field of dhcp packet */
 196 #define ETHERNET_HARDWARE_ADDRESS_LENGTH     6     /* length of Ethernet hardware addresses */
 197
 198 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
 199
 200 char network_interface_name[IFNAMSIZ]="eth0";
 201
 202 u_int32_t packet_xid=0;
 203
 204 u_int32_t dhcp_lease_time=0;
 205 u_int32_t dhcp_renewal_time=0;
 206 u_int32_t dhcp_rebinding_time=0;
 207
 208 int dhcpoffer_timeout=2;
 209
 210 dhcp_offer *dhcp_offer_list=NULL;
 211 requested_server *requested_server_list=NULL;
 212
 213 int valid_responses=0;     /* number of valid DHCPOFFERs we received */
 214 int requested_servers=0;
 215 int requested_responses=0;
 216
 217 int request_specific_address=FALSE;
 218 int received_requested_address=FALSE;
 219 int verbose=0;
 220 struct in_addr requested_address;
 221
 222
 223 int process_arguments(int, char **);
 224 int call_getopt(int, char **);
 225 int validate_arguments(void);
 226 void print_usage(void);
 227 void print_help(void);
 228
 229 int get_hardware_address(int,char *);
 230
 231 int send_dhcp_discover(int);
 232 int get_dhcp_offer(int);
 233
 234 int get_results(void);
 235
 236 int add_dhcp_offer(struct in_addr,dhcp_packet *);
 237 int free_dhcp_offer_list(void);
 238 int free_requested_server_list(void);
 239
 240 int create_dhcp_socket(void);
 241 int close_dhcp_socket(int);
 242 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
 243 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
 244
 245
 246
 247 int main(int argc, char **argv){
 248         int dhcp_socket;
 249         int result = STATE_UNKNOWN;
 250
 251         setlocale (LC_ALL, "");
 252         bindtextdomain (PACKAGE, LOCALEDIR);
 253         textdomain (PACKAGE);
 254
 255         if(process_arguments(argc,argv)!=OK){
 256                 usage4 (_("Could not parse arguments"));
 257                 }
 258
 259         /* create socket for DHCP communications */
 260         dhcp_socket=create_dhcp_socket();
 261
 262         /* get hardware address of client machine */
 263         get_hardware_address(dhcp_socket,network_interface_name);
 264
 265         /* send DHCPDISCOVER packet */
 266         send_dhcp_discover(dhcp_socket);
 267
 268         /* wait for a DHCPOFFER packet */
 269         get_dhcp_offer(dhcp_socket);
 270
 271         /* close socket we created */
 272         close_dhcp_socket(dhcp_socket);
 273
 274         /* determine state/plugin output to return */
 275         result=get_results();
 276
 277         /* free allocated memory */
 278         free_dhcp_offer_list();
 279         free_requested_server_list();
 280
 281         return result;
 282         }
 283
 284
 285
 286 /* determines hardware address on client machine */
 287 int get_hardware_address(int sock,char *interface_name){
 288
 289         int i;
 290
 291 #if defined(__linux__)
 292         struct ifreq ifr;
 293
 294         strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
 295
 296         /* try and grab hardware address of requested interface */
 297         if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
 298                 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
 299                 exit(STATE_UNKNOWN);
 300                 }
 301
 302         memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
 303
 304 #elif defined(__bsd__)
 305                                                 /* King 2004    see ACKNOWLEDGEMENTS */
 306
 307         int                     mib[6], len;
 308         char                    *buf;
 309         unsigned char           *ptr;
 310         struct if_msghdr        *ifm;
 311         struct sockaddr_dl      *sdl;
 312
 313         mib[0] = CTL_NET;
 314         mib[1] = AF_ROUTE;
 315         mib[2] = 0;
 316         mib[3] = AF_LINK;
 317         mib[4] = NET_RT_IFLIST;
 318
 319         if((mib[5] = if_nametoindex(interface_name)) == 0){
 320                 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
 321                 exit(STATE_UNKNOWN);
 322                 }
 323
 324         if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
 325                 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
 326                 exit(STATE_UNKNOWN);
 327                 }
 328
 329         if((buf = malloc(len)) == NULL){
 330                 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
 331                 exit(4);
 332                 }
 333
 334         if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
 335                 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
 336                 exit(STATE_UNKNOWN);
 337                 }
 338
 339         ifm = (struct if_msghdr *)buf;
 340         sdl = (struct sockaddr_dl *)(ifm + 1);
 341         ptr = (unsigned char *)LLADDR(sdl);
 342         memcpy(&client_hardware_address[0], ptr, 6) ;
 343                                                 /* King 2004 */
 344
 345 #elif defined(__sun__) || defined(__solaris__)
 346
 347                                                 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
 348         long stat;
 349         char dev[20] = "/dev/";
 350         char *p;
 351         int unit;
 352
 353         for(p = interface_name; *p && isalpha(*p); p++)
 354                 /* no-op */ ;
 355         if( p != '\0' ){
 356                 unit = atoi(p) ;
 357                 *p = '\0' ;
 358                 strncat(dev, interface_name, 6) ;
 359                 }
 360         else{
 361                 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
 362                 exit(STATE_UNKNOWN);
 363                 }
 364         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 365         if(stat != 0){
 366                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 367                 exit(STATE_UNKNOWN);
 368                 }
 369
 370 #elif defined(__hpux__)
 371
 372         long stat;
 373         char dev[20] = "/dev/dlpi" ;
 374         int unit = 0;
 375
 376         stat = mac_addr_dlpi(dev, unit, client_hardware_address);
 377         if(stat != 0){
 378                 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
 379                 exit(STATE_UNKNOWN);
 380                 }
 381                                                 /* Kompf 2000-2003 */
 382
 383 #else
 384         printf(_("Error: can't get MAC address for this architecture.\n"));
 385         exit(STATE_UNKNOWN);
 386 #endif
 387
 388         if(verbose){
 389                 printf(_("Hardware address: "));
 390                 for (i=0; i<6; ++i)
 391                         printf("%2.2x", client_hardware_address[i]);
 392                 printf( "\n");
 393                 }
 394
 395         return OK;
 396         }
 397
 398
 399 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
 400 int send_dhcp_discover(int sock){
 401         dhcp_packet discover_packet;
 402         struct sockaddr_in sockaddr_broadcast;
 403
 404
 405         /* clear the packet data structure */
 406         bzero(&discover_packet,sizeof(discover_packet));
 407
 408
 409         /* boot request flag (backward compatible with BOOTP servers) */
 410         discover_packet.op=BOOTREQUEST;
 411
 412         /* hardware address type */
 413         discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
 414
 415         /* length of our hardware address */
 416         discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
 417
 418         discover_packet.hops=0;
 419
 420         /* transaction id is supposed to be random */
 421         srand(time(NULL));
 422         packet_xid=random();
 423         discover_packet.xid=htonl(packet_xid);
 424
 425         /**** WHAT THE HECK IS UP WITH THIS?!?  IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
 426         /* downright bizzarre... */
 427         ntohl(discover_packet.xid);
 428
 429         /*discover_packet.secs=htons(65535);*/
 430         discover_packet.secs=0xFF;
 431
 432         /* tell server it should broadcast its response */
 433         discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
 434
 435         /* our hardware address */
 436         memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
 437
 438         /* first four bytes of options field is magic cookie (as per RFC 2132) */
 439         discover_packet.options[0]='\x63';
 440         discover_packet.options[1]='\x82';
 441         discover_packet.options[2]='\x53';
 442         discover_packet.options[3]='\x63';
 443
 444         /* DHCP message type is embedded in options field */
 445         discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE;    /* DHCP message type option identifier */
 446         discover_packet.options[5]='\x01';               /* DHCP message option length in bytes */
 447         discover_packet.options[6]=DHCPDISCOVER;
 448
 449         /* the IP address we're requesting */
 450         if(request_specific_address==TRUE){
 451                 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
 452                 discover_packet.options[8]='\x04';
 453                 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
 454                 }
 455
 456         /* send the DHCPDISCOVER packet to broadcast address */
 457         sockaddr_broadcast.sin_family=AF_INET;
 458         sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
 459         sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
 460         bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
 461
 462
 463         if(verbose){
 464                 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
 465                 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
 466                 printf("DHCDISCOVER ciaddr:  %s\n",inet_ntoa(discover_packet.ciaddr));
 467                 printf("DHCDISCOVER yiaddr:  %s\n",inet_ntoa(discover_packet.yiaddr));
 468                 printf("DHCDISCOVER siaddr:  %s\n",inet_ntoa(discover_packet.siaddr));
 469                 printf("DHCDISCOVER giaddr:  %s\n",inet_ntoa(discover_packet.giaddr));
 470                 }
 471
 472         /* send the DHCPDISCOVER packet out */
 473         send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
 474
 475         if(verbose)
 476                 printf("\n\n");
 477
 478         return OK;
 479         }
 480
 481
 482
 483
 484 /* waits for a DHCPOFFER message from one or more DHCP servers */
 485 int get_dhcp_offer(int sock){
 486         dhcp_packet offer_packet;
 487         struct sockaddr_in source;
 488         struct sockaddr_in via;
 489         int result=OK;
 490         int timeout=1;
 491         int responses=0;
 492         int x;
 493         time_t start_time;
 494         time_t current_time;
 495
 496         time(&start_time);
 497
 498         /* receive as many responses as we can */
 499         for(responses=0,valid_responses=0;;){
 500
 501                 time(&current_time);
 502                 if((current_time-start_time)>=dhcpoffer_timeout)
 503                         break;
 504
 505                 if(verbose)
 506                         printf("\n\n");
 507
 508                 bzero(&source,sizeof(source));
 509                 bzero(&via,sizeof(via));
 510                 bzero(&offer_packet,sizeof(offer_packet));
 511
 512                 result=OK;
 513                 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
 514
 515                 if(result!=OK){
 516                         if(verbose)
 517                                 printf(_("Result=ERROR\n"));
 518
 519                         continue;
 520                         }
 521                 else{
 522                         if(verbose)
 523                                 printf(_("Result=OK\n"));
 524
 525                         responses++;
 526                         }
 527
 528                 /* The "source" is either a server or a relay. */
 529                 /* Save a copy of "source" into "via" even if it's via itself */
 530                 memcpy(&via,&source,sizeof(source)) ;
 531
 532                 /* If siaddr is non-zero, set "source" to siaddr */
 533                 if(offer_packet.siaddr.s_addr != 0L){
 534                         source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
 535                         }
 536
 537                 if(verbose){
 538                         printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
 539                         printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
 540                         printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
 541                         }
 542
 543                 /* check packet xid to see if its the same as the one we used in the discover packet */
 544                 if(ntohl(offer_packet.xid)!=packet_xid){
 545                         if(verbose)
 546                                 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
 547
 548                         continue;
 549                         }
 550
 551                 /* check hardware address */
 552                 result=OK;
 553                 if(verbose)
 554                         printf("DHCPOFFER chaddr: ");
 555
 556                 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
 557                         if(verbose)
 558                                 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
 559
 560                         if(offer_packet.chaddr[x]!=client_hardware_address[x])
 561                                 result=ERROR;
 562                         }
 563                 if(verbose)
 564                         printf("\n");
 565
 566                 if(result==ERROR){
 567                         if(verbose)
 568                                 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
 569
 570                         continue;
 571                         }
 572
 573                 if(verbose){
 574                         printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
 575                         printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
 576                         printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
 577                         printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
 578                         }
 579
 580                 add_dhcp_offer(source.sin_addr,&offer_packet);
 581
 582                 valid_responses++;
 583                 }
 584
 585         if(verbose){
 586                 printf(_("Total responses seen on the wire: %d\n"),responses);
 587                 printf(_("Valid responses for this machine: %d\n"),valid_responses);
 588                 }
 589
 590         return OK;
 591         }
 592
 593
 594
 595 /* sends a DHCP packet */
 596 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
 597         struct sockaddr_in myname;
 598         int result;
 599
 600         result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
 601
 602         if(verbose)
 603                 printf(_("send_dhcp_packet result: %d\n"),result);
 604
 605         if(result<0)
 606                 return ERROR;
 607
 608         return OK;
 609         }
 610
 611
 612
 613 /* receives a DHCP packet */
 614 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
 615         struct timeval tv;
 616         fd_set readfds;
 617         int recv_result;
 618         socklen_t address_size;
 619         struct sockaddr_in source_address;
 620
 621
 622         /* wait for data to arrive (up time timeout) */
 623         tv.tv_sec=timeout;
 624         tv.tv_usec=0;
 625         FD_ZERO(&readfds);
 626         FD_SET(sock,&readfds);
 627         select(sock+1,&readfds,NULL,NULL,&tv);
 628
 629         /* make sure some data has arrived */
 630         if(!FD_ISSET(sock,&readfds)){
 631                 if(verbose)
 632                         printf(_("No (more) data received\n"));
 633                 return ERROR;
 634                 }
 635
 636         else{
 637
 638                 /* 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
 639                    not being interpreted correctly.  sigh... */
 640                 bzero(&source_address,sizeof(source_address));
 641                 address_size=sizeof(source_address);
 642                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
 643                 if(verbose)
 644                         printf("recv_result_1: %d\n",recv_result);
 645                 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
 646                 if(verbose)
 647                         printf("recv_result_2: %d\n",recv_result);
 648
 649                 if(recv_result==-1){
 650                         if(verbose){
 651                                 printf(_("recvfrom() failed, "));
 652                                 printf("errno: (%d) -> %s\n",errno,strerror(errno));
 653                                 }
 654                         return ERROR;
 655                         }
 656                 else{
 657                         if(verbose){
 658                                 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
 659                                 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
 660                                 }
 661
 662                         memcpy(address,&source_address,sizeof(source_address));
 663                         return OK;
 664                         }
 665                 }
 666
 667         return OK;
 668         }
 669
 670
 671 /* creates a socket for DHCP communication */
 672 int create_dhcp_socket(void){
 673         struct sockaddr_in myname;
 674         struct ifreq interface;
 675         int sock;
 676         int flag=1;
 677
 678         /* Set up the address we're going to bind to. */
 679         bzero(&myname,sizeof(myname));
 680         myname.sin_family=AF_INET;
 681         myname.sin_port=htons(DHCP_CLIENT_PORT);
 682         myname.sin_addr.s_addr=INADDR_ANY;                 /* listen on any address */
 683         bzero(&myname.sin_zero,sizeof(myname.sin_zero));
 684
 685         /* create a socket for DHCP communications */
 686         sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
 687         if(sock<0){
 688                 printf(_("Error: Could not create socket!\n"));
 689                 exit(STATE_UNKNOWN);
 690                 }
 691
 692         if(verbose)
 693                 printf("DHCP socket: %d\n",sock);
 694
 695         /* set the reuse address flag so we don't get errors when restarting */
 696         flag=1;
 697         if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
 698                 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
 699                 exit(STATE_UNKNOWN);
 700                 }
 701
 702         /* set the broadcast option - we need this to listen to DHCP broadcast messages */
 703         if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
 704                 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
 705                 exit(STATE_UNKNOWN);
 706                 }
 707
 708         /* bind socket to interface */
 709 #if defined(__linux__)
 710         strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
 711         if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
 712                 printf(_("Error: Could not bind socket to interface %s.  Check your privileges...\n"),network_interface_name);
 713                 exit(STATE_UNKNOWN);
 714                 }
 715
 716 #else
 717         strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
 718 #endif
 719
 720         /* bind the socket */
 721         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
 722                 printf(_("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n"),DHCP_CLIENT_PORT);
 723                 exit(STATE_UNKNOWN);
 724                 }
 725
 726         return sock;
 727         }
 728
 729
 730 /* closes DHCP socket */
 731 int close_dhcp_socket(int sock){
 732
 733         close(sock);
 734
 735         return OK;
 736         }
 737
 738
 739 /* adds a requested server address to list in memory */
 740 int add_requested_server(struct in_addr server_address){
 741         requested_server *new_server;
 742
 743         new_server=(requested_server *)malloc(sizeof(requested_server));
 744         if(new_server==NULL)
 745                 return ERROR;
 746
 747         new_server->server_address=server_address;
 748         new_server->answered=FALSE;
 749
 750         new_server->next=requested_server_list;
 751         requested_server_list=new_server;
 752
 753         requested_servers++;
 754
 755         if(verbose)
 756                 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
 757
 758         return OK;
 759         }
 760
 761
 762
 763
 764 /* adds a DHCP OFFER to list in memory */
 765 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
 766         dhcp_offer *new_offer;
 767         int x;
 768         int y;
 769         unsigned option_type;
 770         unsigned option_length;
 771
 772         if(offer_packet==NULL)
 773                 return ERROR;
 774
 775         /* process all DHCP options present in the packet */
 776         for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
 777
 778                 /* end of options (0 is really just a pad, but bail out anyway) */
 779                 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
 780                         break;
 781
 782                 /* get option type */
 783                 option_type=offer_packet->options[x++];
 784
 785                 /* get option length */
 786                 option_length=offer_packet->options[x++];
 787
 788                 if(verbose)
 789                         printf("Option: %d (0x%02X)\n",option_type,option_length);
 790
 791                 /* get option data */
 792                 if(option_type==DHCP_OPTION_LEASE_TIME){
 793                         memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
 794                         dhcp_lease_time = ntohl(dhcp_lease_time);
 795                         }
 796                 if(option_type==DHCP_OPTION_RENEWAL_TIME){
 797                         memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
 798                         dhcp_renewal_time = ntohl(dhcp_renewal_time);
 799                         }
 800                 if(option_type==DHCP_OPTION_REBINDING_TIME){
 801                         memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
 802                         dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
 803                         }
 804
 805                 /* skip option data we're ignoring */
 806                 else
 807                         for(y=0;y<option_length;y++,x++);
 808                 }
 809
 810         if(verbose){
 811                 if(dhcp_lease_time==DHCP_INFINITE_TIME)
 812                         printf(_("Lease Time: Infinite\n"));
 813                 else
 814                         printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
 815                 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
 816                         printf(_("Renewal Time: Infinite\n"));
 817                 else
 818                         printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
 819                 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
 820                         printf(_("Rebinding Time: Infinite\n"));
 821                 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
 822                 }
 823
 824         new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
 825
 826         if(new_offer==NULL)
 827                 return ERROR;
 828
 829         new_offer->server_address=source;
 830         new_offer->offered_address=offer_packet->yiaddr;
 831         new_offer->lease_time=dhcp_lease_time;
 832         new_offer->renewal_time=dhcp_renewal_time;
 833         new_offer->rebinding_time=dhcp_rebinding_time;
 834
 835
 836         if(verbose){
 837                 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
 838                 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
 839                 }
 840
 841         /* add new offer to head of list */
 842         new_offer->next=dhcp_offer_list;
 843         dhcp_offer_list=new_offer;
 844
 845         return OK;
 846         }
 847
 848
 849 /* frees memory allocated to DHCP OFFER list */
 850 int free_dhcp_offer_list(void){
 851         dhcp_offer *this_offer;
 852         dhcp_offer *next_offer;
 853
 854         for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
 855                 next_offer=this_offer->next;
 856                 free(this_offer);
 857                 }
 858
 859         return OK;
 860         }
 861
 862
 863 /* frees memory allocated to requested server list */
 864 int free_requested_server_list(void){
 865         requested_server *this_server;
 866         requested_server *next_server;
 867
 868         for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
 869                 next_server=this_server->next;
 870                 free(this_server);
 871                 }
 872
 873         return OK;
 874         }
 875
 876
 877 /* gets state and plugin output to return */
 878 int get_results(void){
 879         dhcp_offer *temp_offer;
 880         requested_server *temp_server;
 881         int result;
 882         u_int32_t max_lease_time=0;
 883
 884         received_requested_address=FALSE;
 885
 886         /* checks responses from requested servers */
 887         requested_responses=0;
 888         if(requested_servers>0){
 889
 890                 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
 891
 892                         for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 893
 894                                 /* get max lease time we were offered */
 895                                 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 896                                         max_lease_time=temp_offer->lease_time;
 897
 898                                 /* see if we got the address we requested */
 899                                 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 900                                         received_requested_address=TRUE;
 901
 902                                 /* see if the servers we wanted a response from talked to us or not */
 903                                 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
 904                                         if(verbose){
 905                                                 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
 906                                                 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
 907                                                 if(temp_server->answered)
 908                                                         printf(_(" (duplicate)"));
 909                                                 printf(_("\n"));
 910                                                 }
 911                                         if(temp_server->answered == FALSE){
 912                                                 requested_responses++;
 913                                                 temp_server->answered=TRUE;
 914                                                 }
 915                                         }
 916                                 }
 917                         }
 918
 919                 }
 920
 921         /* else check and see if we got our requested address from any server */
 922         else{
 923
 924                 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
 925
 926                         /* get max lease time we were offered */
 927                         if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
 928                                 max_lease_time=temp_offer->lease_time;
 929
 930                         /* see if we got the address we requested */
 931                         if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
 932                                 received_requested_address=TRUE;
 933                         }
 934                 }
 935
 936         result=STATE_OK;
 937         if(valid_responses==0)
 938                 result=STATE_CRITICAL;
 939         else if(requested_servers>0 && requested_responses==0)
 940                 result=STATE_CRITICAL;
 941         else if(requested_responses<requested_servers)
 942                 result=STATE_WARNING;
 943         else if(request_specific_address==TRUE && received_requested_address==FALSE)
 944                 result=STATE_WARNING;
 945
 946         if(result==0)               /* garrett honeycutt 2005 */
 947                 printf("OK: ");
 948         else if(result==1)
 949                 printf("WARNING: ");
 950         else if(result==2)
 951                 printf("CRITICAL: ");
 952         else if(result==3)
 953                 printf("UNKNOWN: ");
 954
 955         /* we didn't receive any DHCPOFFERs */
 956         if(dhcp_offer_list==NULL){
 957                 printf(_("No DHCPOFFERs were received.\n"));
 958                 return result;
 959                 }
 960
 961         printf(_("Received %d DHCPOFFER(s)"),valid_responses);
 962
 963         if(requested_servers>0)
 964                 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
 965
 966         if(request_specific_address==TRUE)
 967                 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
 968
 969         printf(_(", max lease time = "));
 970         if(max_lease_time==DHCP_INFINITE_TIME)
 971                 printf(_("Infinity"));
 972         else
 973                 printf("%lu sec",(unsigned long)max_lease_time);
 974
 975         printf(".\n");
 976
 977         return result;
 978         }
 979
 980
 981 /* process command-line arguments */
 982 int process_arguments(int argc, char **argv){
 983         int c;
 984
 985         if(argc<1)
 986                 return ERROR;
 987
 988         c=0;
 989         while((c+=(call_getopt(argc-c,&argv[c])))<argc){
 990
 991                 /*
 992                 if(is_option(argv[c]))
 993                         continue;
 994                 */
 995                 }
 996
 997         return validate_arguments();
 998         }
 999
1000
1001
1002 int call_getopt(int argc, char **argv){
1003         int c=0;
1004         int i=0;
1005         struct in_addr ipaddress;
1006
1007         int option_index = 0;
1008         static struct option long_options[] =
1009         {
1010                 {"serverip",       required_argument,0,'s'},
1011                 {"requestedip",    required_argument,0,'r'},
1012                 {"timeout",        required_argument,0,'t'},
1013                 {"interface",      required_argument,0,'i'},
1014                 {"verbose",        no_argument,      0,'v'},
1015                 {"version",        no_argument,      0,'V'},
1016                 {"help",           no_argument,      0,'h'},
1017                 {0,0,0,0}
1018         };
1019
1020         while(1){
1021                 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1022
1023                 i++;
1024
1025                 if(c==-1||c==EOF||c==1)
1026                         break;
1027
1028                 switch(c){
1029                 case 'w':
1030                 case 'r':
1031                 case 't':
1032                 case 'i':
1033                         i++;
1034                         break;
1035                 default:
1036                         break;
1037                         }
1038
1039                 switch(c){
1040
1041                 case 's': /* DHCP server address */
1042                         if(inet_aton(optarg,&ipaddress))
1043                                 add_requested_server(ipaddress);
1044                         /*
1045                         else
1046                                 usage("Invalid server IP address\n");
1047                         */
1048                         break;
1049
1050                 case 'r': /* address we are requested from DHCP servers */
1051                         if(inet_aton(optarg,&ipaddress)){
1052                                 requested_address=ipaddress;
1053                                 request_specific_address=TRUE;
1054                                 }
1055                         /*
1056                         else
1057                                 usage("Invalid requested IP address\n");
1058                         */
1059                         break;
1060
1061                 case 't': /* timeout */
1062
1063                         /*
1064                         if(is_intnonneg(optarg))
1065                         */
1066                         if(atoi(optarg)>0)
1067                                 dhcpoffer_timeout=atoi(optarg);
1068                         /*
1069                         else
1070                                 usage("Time interval must be a nonnegative integer\n");
1071                         */
1072                         break;
1073
1074                 case 'i': /* interface name */
1075
1076                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1077                         network_interface_name[sizeof(network_interface_name)-1]='\x0';
1078
1079                         break;
1080
1081                 case 'V': /* version */
1082                         print_revision(progname,revision);
1083                         exit(STATE_OK);
1084
1085                 case 'h': /* help */
1086                         print_help();
1087                         exit(STATE_OK);
1088
1089                 case 'v': /* verbose */
1090                         verbose=1;
1091                         break;
1092
1093                 case '?': /* help */
1094                         usage2 (_("Unknown argument"), optarg);
1095                         break;
1096
1097                 default:
1098                         break;
1099                         }
1100                 }
1101
1102         return i;
1103         }
1104
1105
1106 int validate_arguments(void){
1107
1108         return OK;
1109         }
1110
1111
1112 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1113 /* Kompf 2000-2003      see ACKNOWLEDGEMENTS */
1114
1115 /* get a message from a stream; return type of message */
1116 static int get_msg(int fd){
1117         int flags = 0;
1118         int res, ret;
1119         ctl_area[0] = 0;
1120         dat_area[0] = 0;
1121         ret = 0;
1122         res = getmsg(fd, &ctl, &dat, &flags);
1123
1124         if(res < 0){
1125                 if(errno == EINTR){
1126                         return(GOT_INTR);
1127                         }
1128                 else{
1129                         printf("%s\n", "get_msg FAILED.");
1130                         return(GOT_ERR);
1131                         }
1132                 }
1133         if(ctl.len > 0){
1134                 ret |= GOT_CTRL;
1135                 }
1136         if(dat.len > 0){
1137                 ret |= GOT_DATA;
1138                 }
1139
1140         return(ret);
1141         }
1142
1143 /* verify that dl_primitive in ctl_area = prim */
1144 static int check_ctrl(int prim){
1145         dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1146
1147         if(err_ack->dl_primitive != prim){
1148                 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1149                 exit(STATE_UNKNOWN);
1150                 }
1151
1152         return 0;
1153         }
1154
1155 /* put a control message on a stream */
1156 static int put_ctrl(int fd, int len, int pri){
1157
1158         ctl.len = len;
1159         if(putmsg(fd, &ctl, 0, pri) < 0){
1160                 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1161                 exit(STATE_UNKNOWN);
1162                 }
1163
1164         return  0;
1165         }
1166
1167 /* put a control + data message on a stream */
1168 static int put_both(int fd, int clen, int dlen, int pri){
1169
1170         ctl.len = clen;
1171         dat.len = dlen;
1172         if(putmsg(fd, &ctl, &dat, pri) < 0){
1173                 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1174                 exit(STATE_UNKNOWN);
1175                 }
1176
1177         return  0;
1178         }
1179
1180 /* open file descriptor and attach */
1181 static int dl_open(const char *dev, int unit, int *fd){
1182         dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1183
1184         if((*fd = open(dev, O_RDWR)) == -1){
1185                 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1186                 exit(STATE_UNKNOWN);
1187                 }
1188         attach_req->dl_primitive = DL_ATTACH_REQ;
1189         attach_req->dl_ppa = unit;
1190         put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1191         get_msg(*fd);
1192         return check_ctrl(DL_OK_ACK);
1193         }
1194
1195 /* send DL_BIND_REQ */
1196 static int dl_bind(int fd, int sap, u_char *addr){
1197         dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1198         dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1199
1200         bind_req->dl_primitive = DL_BIND_REQ;
1201         bind_req->dl_sap = sap;
1202         bind_req->dl_max_conind = 1;
1203         bind_req->dl_service_mode = DL_CLDLS;
1204         bind_req->dl_conn_mgmt = 0;
1205         bind_req->dl_xidtest_flg = 0;
1206         put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1207         get_msg(fd);
1208         if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1209                 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1210                 exit(STATE_UNKNOWN);
1211                 }
1212         bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1213               bind_ack->dl_addr_length);
1214
1215         return 0;
1216         }
1217
1218 /***********************************************************************
1219  * interface:
1220  * function mac_addr_dlpi - get the mac address of the interface with
1221  *                          type dev (eg lnc, hme) and unit (0, 1 ..)
1222  *
1223  * parameter: addr: an array of six bytes, has to be allocated by the caller
1224  *
1225  * return: 0 if OK, -1 if the address could not be determined
1226  *
1227  *
1228  ***********************************************************************/
1229
1230 long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
1231         int fd;
1232         u_char mac_addr[25];
1233
1234         if(GOT_ERR != dl_open(dev, unit, &fd)){
1235                 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1236                         bcopy( mac_addr, addr, 6);
1237                         return 0;
1238                         }
1239                 }
1240         close(fd);
1241
1242         return -1;
1243         }
1244
1245 /* Kompf 2000-2003 */
1246 #endif
1247
1248
1249 /* print usage help */
1250 void print_help(void){
1251
1252         print_revision(progname,revision);
1253
1254         printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1255         printf (COPYRIGHT, copyright, email);
1256
1257         printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1258
1259   printf ("\n\n");
1260
1261         print_usage();
1262
1263         printf (_(UT_HELP_VRSN));
1264
1265         printf (_(UT_VERBOSE));
1266
1267         printf (" %s\n", "-s, --serverip=IPADDRESS");
1268   printf ("    %s\n", _("IP address of DHCP server that we must hear from"));
1269   printf (" %s\n", "-r, --requestedip=IPADDRESS");
1270   printf ("    %s\n", _("IP address that should be offered by at least one DHCP server"));
1271   printf (" %s\n", "-t, --timeout=INTEGER");
1272   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1273   printf (" %s\n", "-i, --interface=STRING");
1274   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
1275
1276         return;
1277         }
1278
1279
1280 void
1281 print_usage(void){
1282
1283   printf (_("Usage:"));
1284   printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1285
1286         return;
1287         }
1288
1289
1290