plugins-root/check_dhcp.c

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