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