plugins-root/check_dhcp.c

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