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