1 /******************************************************************************
2 *
3 * Nagios check_dhcp plugin
4 *
5 * License: GPL
6 * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
7 * Copyright (c) 2001-2006 Nagios Plugin Development Team
8 *
9 * Last Modified: $Date$
10 *
11 * Description:
12 *
13 * This file contains the check_dhcp plugin
14 *
15 * This plugin tests the availability of DHCP servers on a network.
16 *
17 *
18 * License Information:
19 *
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation; either version 2 of the License, or
23 * (at your option) any later version.
24 *
25 * This program is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
28 * GNU General Public License for more details.
29 *
30 * You should have received a copy of the GNU General Public License
31 * along with this program; if not, write to the Free Software
32 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33 *
34 * $Id$
35 *
36 *****************************************************************************/
38 const char *progname = "check_dhcp";
39 const char *revision = "$Revision$";
40 const char *copyright = "2001-2006";
41 const char *email = "nagiosplug-devel@lists.sourceforge.net";
43 #include "common.h"
44 #include "netutils.h"
45 #include "utils.h"
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <errno.h>
51 #include <unistd.h>
52 #include <sys/time.h>
53 #include <sys/ioctl.h>
54 #include <fcntl.h>
55 #include <getopt.h>
56 #include <sys/socket.h>
57 #include <sys/types.h>
58 #include <netdb.h>
59 #include <netinet/in.h>
60 #include <net/if.h>
61 #include <arpa/inet.h>
63 #if defined( __linux__ )
65 #include <linux/if_ether.h>
66 #include <features.h>
68 #elif defined (__bsd__)
70 #include <netinet/if_ether.h>
71 #include <sys/param.h>
72 #include <sys/sysctl.h>
73 #include <net/if_dl.h>
75 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
77 #define INSAP 22
78 #define OUTSAP 24
80 #include <signal.h>
81 #include <ctype.h>
82 #include <sys/stropts.h>
83 #include <sys/poll.h>
84 #include <sys/dlpi.h>
86 #define bcopy(source, destination, length) memcpy(destination, source, length)
88 #define AREA_SZ 5000 /* buffer length in bytes */
89 static u_long ctl_area[AREA_SZ];
90 static u_long dat_area[AREA_SZ];
91 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
92 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
94 #define GOT_CTRL 1
95 #define GOT_DATA 2
96 #define GOT_BOTH 3
97 #define GOT_INTR 4
98 #define GOT_ERR 128
100 #define u_int8_t uint8_t
101 #define u_int16_t uint16_t
102 #define u_int32_t uint32_t
104 static int get_msg(int);
105 static int check_ctrl(int);
106 static int put_ctrl(int, int, int);
107 static int put_both(int, int, int, int);
108 static int dl_open(const char *, int, int *);
109 static int dl_bind(int, int, u_char *);
110 long mac_addr_dlpi( const char *, int, u_char *);
112 #endif
116 /**** Common definitions ****/
118 #define OK 0
119 #define ERROR -1
121 #define FALSE 0
122 #define TRUE 1
125 /**** DHCP definitions ****/
127 #define MAX_DHCP_CHADDR_LENGTH 16
128 #define MAX_DHCP_SNAME_LENGTH 64
129 #define MAX_DHCP_FILE_LENGTH 128
130 #define MAX_DHCP_OPTIONS_LENGTH 312
133 typedef struct dhcp_packet_struct{
134 u_int8_t op; /* packet type */
135 u_int8_t htype; /* type of hardware address for this machine (Ethernet, etc) */
136 u_int8_t hlen; /* length of hardware address (of this machine) */
137 u_int8_t hops; /* hops */
138 u_int32_t xid; /* random transaction id number - chosen by this machine */
139 u_int16_t secs; /* seconds used in timing */
140 u_int16_t flags; /* flags */
141 struct in_addr ciaddr; /* IP address of this machine (if we already have one) */
142 struct in_addr yiaddr; /* IP address of this machine (offered by the DHCP server) */
143 struct in_addr siaddr; /* IP address of DHCP server */
144 struct in_addr giaddr; /* IP address of DHCP relay */
145 unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH]; /* hardware address of this machine */
146 char sname [MAX_DHCP_SNAME_LENGTH]; /* name of DHCP server */
147 char file [MAX_DHCP_FILE_LENGTH]; /* boot file name (used for diskless booting?) */
148 char options[MAX_DHCP_OPTIONS_LENGTH]; /* options */
149 }dhcp_packet;
152 typedef struct dhcp_offer_struct{
153 struct in_addr server_address; /* address of DHCP server that sent this offer */
154 struct in_addr offered_address; /* the IP address that was offered to us */
155 u_int32_t lease_time; /* lease time in seconds */
156 u_int32_t renewal_time; /* renewal time in seconds */
157 u_int32_t rebinding_time; /* rebinding time in seconds */
158 struct dhcp_offer_struct *next;
159 }dhcp_offer;
162 typedef struct requested_server_struct{
163 struct in_addr server_address;
164 int answered;
165 struct requested_server_struct *next;
166 }requested_server;
169 #define BOOTREQUEST 1
170 #define BOOTREPLY 2
172 #define DHCPDISCOVER 1
173 #define DHCPOFFER 2
174 #define DHCPREQUEST 3
175 #define DHCPDECLINE 4
176 #define DHCPACK 5
177 #define DHCPNACK 6
178 #define DHCPRELEASE 7
180 #define DHCP_OPTION_MESSAGE_TYPE 53
181 #define DHCP_OPTION_HOST_NAME 12
182 #define DHCP_OPTION_BROADCAST_ADDRESS 28
183 #define DHCP_OPTION_REQUESTED_ADDRESS 50
184 #define DHCP_OPTION_LEASE_TIME 51
185 #define DHCP_OPTION_SERVER_IDENTIFIER 54
186 #define DHCP_OPTION_RENEWAL_TIME 58
187 #define DHCP_OPTION_REBINDING_TIME 59
188 #define DHCP_OPTION_END 255
190 #define DHCP_INFINITE_TIME 0xFFFFFFFF
192 #define DHCP_BROADCAST_FLAG 32768
194 #define DHCP_SERVER_PORT 67
195 #define DHCP_CLIENT_PORT 68
197 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
198 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
200 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
202 char network_interface_name[IFNAMSIZ]="eth0";
204 u_int32_t packet_xid=0;
206 u_int32_t dhcp_lease_time=0;
207 u_int32_t dhcp_renewal_time=0;
208 u_int32_t dhcp_rebinding_time=0;
210 int dhcpoffer_timeout=2;
212 dhcp_offer *dhcp_offer_list=NULL;
213 requested_server *requested_server_list=NULL;
215 int valid_responses=0; /* number of valid DHCPOFFERs we received */
216 int requested_servers=0;
217 int requested_responses=0;
219 int request_specific_address=FALSE;
220 int received_requested_address=FALSE;
221 int verbose=0;
222 struct in_addr requested_address;
225 int process_arguments(int, char **);
226 int call_getopt(int, char **);
227 int validate_arguments(void);
228 void print_usage(void);
229 void print_help(void);
231 int get_hardware_address(int,char *);
233 int send_dhcp_discover(int);
234 int get_dhcp_offer(int);
236 int get_results(void);
238 int add_dhcp_offer(struct in_addr,dhcp_packet *);
239 int free_dhcp_offer_list(void);
240 int free_requested_server_list(void);
242 int create_dhcp_socket(void);
243 int close_dhcp_socket(int);
244 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
245 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
249 int main(int argc, char **argv){
250 int dhcp_socket;
251 int result = STATE_UNKNOWN;
253 /* this plugin almost certainly needs root permissions. */
254 np_warn_if_not_root();
256 setlocale (LC_ALL, "");
257 bindtextdomain (PACKAGE, LOCALEDIR);
258 textdomain (PACKAGE);
260 if(process_arguments(argc,argv)!=OK){
261 usage4 (_("Could not parse arguments"));
262 }
264 /* create socket for DHCP communications */
265 dhcp_socket=create_dhcp_socket();
267 /* get hardware address of client machine */
268 get_hardware_address(dhcp_socket,network_interface_name);
270 /* send DHCPDISCOVER packet */
271 send_dhcp_discover(dhcp_socket);
273 /* wait for a DHCPOFFER packet */
274 get_dhcp_offer(dhcp_socket);
276 /* close socket we created */
277 close_dhcp_socket(dhcp_socket);
279 /* determine state/plugin output to return */
280 result=get_results();
282 /* free allocated memory */
283 free_dhcp_offer_list();
284 free_requested_server_list();
286 return result;
287 }
291 /* determines hardware address on client machine */
292 int get_hardware_address(int sock,char *interface_name){
294 int i;
296 #if defined(__linux__)
297 struct ifreq ifr;
299 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
301 /* try and grab hardware address of requested interface */
302 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
303 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
304 exit(STATE_UNKNOWN);
305 }
307 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
309 #elif defined(__bsd__)
310 /* King 2004 see ACKNOWLEDGEMENTS */
312 int mib[6], len;
313 char *buf;
314 unsigned char *ptr;
315 struct if_msghdr *ifm;
316 struct sockaddr_dl *sdl;
318 mib[0] = CTL_NET;
319 mib[1] = AF_ROUTE;
320 mib[2] = 0;
321 mib[3] = AF_LINK;
322 mib[4] = NET_RT_IFLIST;
324 if((mib[5] = if_nametoindex(interface_name)) == 0){
325 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
326 exit(STATE_UNKNOWN);
327 }
329 if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
330 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
331 exit(STATE_UNKNOWN);
332 }
334 if((buf = malloc(len)) == NULL){
335 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
336 exit(4);
337 }
339 if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
340 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
341 exit(STATE_UNKNOWN);
342 }
344 ifm = (struct if_msghdr *)buf;
345 sdl = (struct sockaddr_dl *)(ifm + 1);
346 ptr = (unsigned char *)LLADDR(sdl);
347 memcpy(&client_hardware_address[0], ptr, 6) ;
348 /* King 2004 */
350 #elif defined(__sun__) || defined(__solaris__)
352 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
353 long stat;
354 char dev[20] = "/dev/";
355 char *p;
356 int unit;
358 for(p = interface_name; *p && isalpha(*p); p++)
359 /* no-op */ ;
360 if( p != '\0' ){
361 unit = atoi(p) ;
362 *p = '\0' ;
363 strncat(dev, interface_name, 6) ;
364 }
365 else{
366 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
367 exit(STATE_UNKNOWN);
368 }
369 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
370 if(stat != 0){
371 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
372 exit(STATE_UNKNOWN);
373 }
375 #elif defined(__hpux__)
377 long stat;
378 char dev[20] = "/dev/dlpi" ;
379 int unit = 0;
381 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
382 if(stat != 0){
383 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
384 exit(STATE_UNKNOWN);
385 }
386 /* Kompf 2000-2003 */
388 #else
389 printf(_("Error: can't get MAC address for this architecture.\n"));
390 exit(STATE_UNKNOWN);
391 #endif
393 if(verbose){
394 printf(_("Hardware address: "));
395 for (i=0; i<6; ++i)
396 printf("%2.2x", client_hardware_address[i]);
397 printf( "\n");
398 }
400 return OK;
401 }
404 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
405 int send_dhcp_discover(int sock){
406 dhcp_packet discover_packet;
407 struct sockaddr_in sockaddr_broadcast;
408 unsigned short opts;
411 /* clear the packet data structure */
412 bzero(&discover_packet,sizeof(discover_packet));
415 /* boot request flag (backward compatible with BOOTP servers) */
416 discover_packet.op=BOOTREQUEST;
418 /* hardware address type */
419 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
421 /* length of our hardware address */
422 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
424 discover_packet.hops=0;
426 /* transaction id is supposed to be random */
427 srand(time(NULL));
428 packet_xid=random();
429 discover_packet.xid=htonl(packet_xid);
431 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
432 /* downright bizzarre... */
433 ntohl(discover_packet.xid);
435 /*discover_packet.secs=htons(65535);*/
436 discover_packet.secs=0xFF;
438 /* tell server it should broadcast its response */
439 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
441 /* our hardware address */
442 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
444 /* first four bytes of options field is magic cookie (as per RFC 2132) */
445 discover_packet.options[0]='\x63';
446 discover_packet.options[1]='\x82';
447 discover_packet.options[2]='\x53';
448 discover_packet.options[3]='\x63';
450 opts = 4;
451 /* DHCP message type is embedded in options field */
452 discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
453 discover_packet.options[opts++]='\x01'; /* DHCP message option length in bytes */
454 discover_packet.options[opts++]=DHCPDISCOVER;
456 /* the IP address we're requesting */
457 if(request_specific_address==TRUE){
458 discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS;
459 discover_packet.options[opts++]='\x04';
460 memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address));
461 opts += sizeof(requested_address);
462 }
463 discover_packet.options[opts++]=DHCP_OPTION_END;
465 /* send the DHCPDISCOVER packet to broadcast address */
466 sockaddr_broadcast.sin_family=AF_INET;
467 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
468 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
469 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
472 if(verbose){
473 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
474 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
475 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
476 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
477 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
478 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
479 }
481 /* send the DHCPDISCOVER packet out */
482 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
484 if(verbose)
485 printf("\n\n");
487 return OK;
488 }
493 /* waits for a DHCPOFFER message from one or more DHCP servers */
494 int get_dhcp_offer(int sock){
495 dhcp_packet offer_packet;
496 struct sockaddr_in source;
497 struct sockaddr_in via;
498 int result=OK;
499 int responses=0;
500 int x;
501 time_t start_time;
502 time_t current_time;
504 time(&start_time);
506 /* receive as many responses as we can */
507 for(responses=0,valid_responses=0;;){
509 time(¤t_time);
510 if((current_time-start_time)>=dhcpoffer_timeout)
511 break;
513 if(verbose)
514 printf("\n\n");
516 bzero(&source,sizeof(source));
517 bzero(&via,sizeof(via));
518 bzero(&offer_packet,sizeof(offer_packet));
520 result=OK;
521 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
523 if(result!=OK){
524 if(verbose)
525 printf(_("Result=ERROR\n"));
527 continue;
528 }
529 else{
530 if(verbose)
531 printf(_("Result=OK\n"));
533 responses++;
534 }
536 /* The "source" is either a server or a relay. */
537 /* Save a copy of "source" into "via" even if it's via itself */
538 memcpy(&via,&source,sizeof(source)) ;
540 /* If siaddr is non-zero, set "source" to siaddr */
541 if(offer_packet.siaddr.s_addr != 0L){
542 source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
543 }
545 if(verbose){
546 printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
547 printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
548 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
549 }
551 /* check packet xid to see if its the same as the one we used in the discover packet */
552 if(ntohl(offer_packet.xid)!=packet_xid){
553 if(verbose)
554 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
556 continue;
557 }
559 /* check hardware address */
560 result=OK;
561 if(verbose)
562 printf("DHCPOFFER chaddr: ");
564 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
565 if(verbose)
566 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
568 if(offer_packet.chaddr[x]!=client_hardware_address[x])
569 result=ERROR;
570 }
571 if(verbose)
572 printf("\n");
574 if(result==ERROR){
575 if(verbose)
576 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
578 continue;
579 }
581 if(verbose){
582 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
583 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
584 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
585 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
586 }
588 add_dhcp_offer(source.sin_addr,&offer_packet);
590 valid_responses++;
591 }
593 if(verbose){
594 printf(_("Total responses seen on the wire: %d\n"),responses);
595 printf(_("Valid responses for this machine: %d\n"),valid_responses);
596 }
598 return OK;
599 }
603 /* sends a DHCP packet */
604 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
605 int result;
607 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
609 if(verbose)
610 printf(_("send_dhcp_packet result: %d\n"),result);
612 if(result<0)
613 return ERROR;
615 return OK;
616 }
620 /* receives a DHCP packet */
621 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
622 struct timeval tv;
623 fd_set readfds;
624 int recv_result;
625 socklen_t address_size;
626 struct sockaddr_in source_address;
629 /* wait for data to arrive (up time timeout) */
630 tv.tv_sec=timeout;
631 tv.tv_usec=0;
632 FD_ZERO(&readfds);
633 FD_SET(sock,&readfds);
634 select(sock+1,&readfds,NULL,NULL,&tv);
636 /* make sure some data has arrived */
637 if(!FD_ISSET(sock,&readfds)){
638 if(verbose)
639 printf(_("No (more) data received\n"));
640 return ERROR;
641 }
643 else{
645 /* 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
646 not being interpreted correctly. sigh... */
647 bzero(&source_address,sizeof(source_address));
648 address_size=sizeof(source_address);
649 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
650 if(verbose)
651 printf("recv_result_1: %d\n",recv_result);
652 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
653 if(verbose)
654 printf("recv_result_2: %d\n",recv_result);
656 if(recv_result==-1){
657 if(verbose){
658 printf(_("recvfrom() failed, "));
659 printf("errno: (%d) -> %s\n",errno,strerror(errno));
660 }
661 return ERROR;
662 }
663 else{
664 if(verbose){
665 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
666 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
667 }
669 memcpy(address,&source_address,sizeof(source_address));
670 return OK;
671 }
672 }
674 return OK;
675 }
678 /* creates a socket for DHCP communication */
679 int create_dhcp_socket(void){
680 struct sockaddr_in myname;
681 struct ifreq interface;
682 int sock;
683 int flag=1;
685 /* Set up the address we're going to bind to. */
686 bzero(&myname,sizeof(myname));
687 myname.sin_family=AF_INET;
688 myname.sin_port=htons(DHCP_CLIENT_PORT);
689 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
690 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
692 /* create a socket for DHCP communications */
693 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
694 if(sock<0){
695 printf(_("Error: Could not create socket!\n"));
696 exit(STATE_UNKNOWN);
697 }
699 if(verbose)
700 printf("DHCP socket: %d\n",sock);
702 /* set the reuse address flag so we don't get errors when restarting */
703 flag=1;
704 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
705 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
706 exit(STATE_UNKNOWN);
707 }
709 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
710 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
711 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
712 exit(STATE_UNKNOWN);
713 }
715 /* bind socket to interface */
716 #if defined(__linux__)
717 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
718 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
719 printf(_("Error: Could not bind socket to interface %s. Check your privileges...\n"),network_interface_name);
720 exit(STATE_UNKNOWN);
721 }
723 #else
724 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
725 #endif
727 /* bind the socket */
728 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
729 printf(_("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n"),DHCP_CLIENT_PORT);
730 exit(STATE_UNKNOWN);
731 }
733 return sock;
734 }
737 /* closes DHCP socket */
738 int close_dhcp_socket(int sock){
740 close(sock);
742 return OK;
743 }
746 /* adds a requested server address to list in memory */
747 int add_requested_server(struct in_addr server_address){
748 requested_server *new_server;
750 new_server=(requested_server *)malloc(sizeof(requested_server));
751 if(new_server==NULL)
752 return ERROR;
754 new_server->server_address=server_address;
755 new_server->answered=FALSE;
757 new_server->next=requested_server_list;
758 requested_server_list=new_server;
760 requested_servers++;
762 if(verbose)
763 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
765 return OK;
766 }
771 /* adds a DHCP OFFER to list in memory */
772 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
773 dhcp_offer *new_offer;
774 int x;
775 unsigned option_type;
776 unsigned option_length;
777 struct in_addr serv_ident = {0};
779 if(offer_packet==NULL)
780 return ERROR;
782 /* process all DHCP options present in the packet */
783 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
785 /* end of options (0 is really just a pad, but bail out anyway) */
786 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
787 break;
789 /* get option type */
790 option_type=offer_packet->options[x++];
792 /* get option length */
793 option_length=offer_packet->options[x++];
795 if(verbose)
796 printf("Option: %d (0x%02X)\n",option_type,option_length);
798 /* get option data */
799 switch(option_type){
800 case DHCP_OPTION_LEASE_TIME:
801 memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
802 dhcp_lease_time = ntohl(dhcp_lease_time);
803 break;
804 case DHCP_OPTION_RENEWAL_TIME:
805 memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
806 dhcp_renewal_time = ntohl(dhcp_renewal_time);
807 break;
808 case DHCP_OPTION_REBINDING_TIME:
809 memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
810 dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
811 break;
812 case DHCP_OPTION_SERVER_IDENTIFIER:
813 memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
814 break;
815 }
817 /* skip option data we're ignoring */
818 if(option_type!=DHCP_OPTION_REBINDING_TIME)
819 x+=option_length;
820 }
822 if(verbose){
823 if(dhcp_lease_time==DHCP_INFINITE_TIME)
824 printf(_("Lease Time: Infinite\n"));
825 else
826 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
827 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
828 printf(_("Renewal Time: Infinite\n"));
829 else
830 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
831 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
832 printf(_("Rebinding Time: Infinite\n"));
833 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
834 }
836 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
838 if(new_offer==NULL)
839 return ERROR;
841 /*
842 * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
843 * 'siaddr' field as the address of the server to use in the next step
844 * of the client's bootstrap process. A DHCP server may return its own
845 * address in the 'siaddr' field, if the server is prepared to supply
846 * the next bootstrap service (e.g., delivery of an operating system
847 * executable image). A DHCP server always returns its own address in
848 * the 'server identifier' option." 'serv_ident' is the 'server
849 * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
850 * wasn't available) the IP address we received the DHCPOFFER from. If
851 * 'serv_ident' isn't available for some reason, we use 'source'.
852 */
853 new_offer->server_address=serv_ident.s_addr?serv_ident:source;
854 new_offer->offered_address=offer_packet->yiaddr;
855 new_offer->lease_time=dhcp_lease_time;
856 new_offer->renewal_time=dhcp_renewal_time;
857 new_offer->rebinding_time=dhcp_rebinding_time;
860 if(verbose){
861 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
862 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
863 }
865 /* add new offer to head of list */
866 new_offer->next=dhcp_offer_list;
867 dhcp_offer_list=new_offer;
869 return OK;
870 }
873 /* frees memory allocated to DHCP OFFER list */
874 int free_dhcp_offer_list(void){
875 dhcp_offer *this_offer;
876 dhcp_offer *next_offer;
878 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
879 next_offer=this_offer->next;
880 free(this_offer);
881 }
883 return OK;
884 }
887 /* frees memory allocated to requested server list */
888 int free_requested_server_list(void){
889 requested_server *this_server;
890 requested_server *next_server;
892 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
893 next_server=this_server->next;
894 free(this_server);
895 }
897 return OK;
898 }
901 /* gets state and plugin output to return */
902 int get_results(void){
903 dhcp_offer *temp_offer;
904 requested_server *temp_server;
905 int result;
906 u_int32_t max_lease_time=0;
908 received_requested_address=FALSE;
910 /* checks responses from requested servers */
911 requested_responses=0;
912 if(requested_servers>0){
914 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
916 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
918 /* get max lease time we were offered */
919 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
920 max_lease_time=temp_offer->lease_time;
922 /* see if we got the address we requested */
923 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
924 received_requested_address=TRUE;
926 /* see if the servers we wanted a response from talked to us or not */
927 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
928 if(verbose){
929 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
930 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
931 if(temp_server->answered)
932 printf(_(" (duplicate)"));
933 printf(_("\n"));
934 }
935 if(temp_server->answered == FALSE){
936 requested_responses++;
937 temp_server->answered=TRUE;
938 }
939 }
940 }
941 }
943 }
945 /* else check and see if we got our requested address from any server */
946 else{
948 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
950 /* get max lease time we were offered */
951 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
952 max_lease_time=temp_offer->lease_time;
954 /* see if we got the address we requested */
955 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
956 received_requested_address=TRUE;
957 }
958 }
960 result=STATE_OK;
961 if(valid_responses==0)
962 result=STATE_CRITICAL;
963 else if(requested_servers>0 && requested_responses==0)
964 result=STATE_CRITICAL;
965 else if(requested_responses<requested_servers)
966 result=STATE_WARNING;
967 else if(request_specific_address==TRUE && received_requested_address==FALSE)
968 result=STATE_WARNING;
970 if(result==0) /* garrett honeycutt 2005 */
971 printf("OK: ");
972 else if(result==1)
973 printf("WARNING: ");
974 else if(result==2)
975 printf("CRITICAL: ");
976 else if(result==3)
977 printf("UNKNOWN: ");
979 /* we didn't receive any DHCPOFFERs */
980 if(dhcp_offer_list==NULL){
981 printf(_("No DHCPOFFERs were received.\n"));
982 return result;
983 }
985 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
987 if(requested_servers>0)
988 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
990 if(request_specific_address==TRUE)
991 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
993 printf(_(", max lease time = "));
994 if(max_lease_time==DHCP_INFINITE_TIME)
995 printf(_("Infinity"));
996 else
997 printf("%lu sec",(unsigned long)max_lease_time);
999 printf(".\n");
1001 return result;
1002 }
1005 /* process command-line arguments */
1006 int process_arguments(int argc, char **argv){
1007 int c;
1009 if(argc<1)
1010 return ERROR;
1012 c=0;
1013 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1015 /*
1016 if(is_option(argv[c]))
1017 continue;
1018 */
1019 }
1021 return validate_arguments();
1022 }
1026 int call_getopt(int argc, char **argv){
1027 int c=0;
1028 int i=0;
1029 struct in_addr ipaddress;
1031 int option_index = 0;
1032 static struct option long_options[] =
1033 {
1034 {"serverip", required_argument,0,'s'},
1035 {"requestedip", required_argument,0,'r'},
1036 {"timeout", required_argument,0,'t'},
1037 {"interface", required_argument,0,'i'},
1038 {"verbose", no_argument, 0,'v'},
1039 {"version", no_argument, 0,'V'},
1040 {"help", no_argument, 0,'h'},
1041 {0,0,0,0}
1042 };
1044 while(1){
1045 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1047 i++;
1049 if(c==-1||c==EOF||c==1)
1050 break;
1052 switch(c){
1053 case 'w':
1054 case 'r':
1055 case 't':
1056 case 'i':
1057 i++;
1058 break;
1059 default:
1060 break;
1061 }
1063 switch(c){
1065 case 's': /* DHCP server address */
1066 if(inet_aton(optarg,&ipaddress))
1067 add_requested_server(ipaddress);
1068 /*
1069 else
1070 usage("Invalid server IP address\n");
1071 */
1072 break;
1074 case 'r': /* address we are requested from DHCP servers */
1075 if(inet_aton(optarg,&ipaddress)){
1076 requested_address=ipaddress;
1077 request_specific_address=TRUE;
1078 }
1079 /*
1080 else
1081 usage("Invalid requested IP address\n");
1082 */
1083 break;
1085 case 't': /* timeout */
1087 /*
1088 if(is_intnonneg(optarg))
1089 */
1090 if(atoi(optarg)>0)
1091 dhcpoffer_timeout=atoi(optarg);
1092 /*
1093 else
1094 usage("Time interval must be a nonnegative integer\n");
1095 */
1096 break;
1098 case 'i': /* interface name */
1100 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1101 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1103 break;
1105 case 'V': /* version */
1106 print_revision(progname,revision);
1107 exit(STATE_OK);
1109 case 'h': /* help */
1110 print_help();
1111 exit(STATE_OK);
1113 case 'v': /* verbose */
1114 verbose=1;
1115 break;
1117 case '?': /* help */
1118 usage5 ();
1119 break;
1121 default:
1122 break;
1123 }
1124 }
1126 return i;
1127 }
1130 int validate_arguments(void){
1132 return OK;
1133 }
1136 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1137 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1139 /* get a message from a stream; return type of message */
1140 static int get_msg(int fd){
1141 int flags = 0;
1142 int res, ret;
1143 ctl_area[0] = 0;
1144 dat_area[0] = 0;
1145 ret = 0;
1146 res = getmsg(fd, &ctl, &dat, &flags);
1148 if(res < 0){
1149 if(errno == EINTR){
1150 return(GOT_INTR);
1151 }
1152 else{
1153 printf("%s\n", "get_msg FAILED.");
1154 return(GOT_ERR);
1155 }
1156 }
1157 if(ctl.len > 0){
1158 ret |= GOT_CTRL;
1159 }
1160 if(dat.len > 0){
1161 ret |= GOT_DATA;
1162 }
1164 return(ret);
1165 }
1167 /* verify that dl_primitive in ctl_area = prim */
1168 static int check_ctrl(int prim){
1169 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1171 if(err_ack->dl_primitive != prim){
1172 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1173 exit(STATE_UNKNOWN);
1174 }
1176 return 0;
1177 }
1179 /* put a control message on a stream */
1180 static int put_ctrl(int fd, int len, int pri){
1182 ctl.len = len;
1183 if(putmsg(fd, &ctl, 0, pri) < 0){
1184 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1185 exit(STATE_UNKNOWN);
1186 }
1188 return 0;
1189 }
1191 /* put a control + data message on a stream */
1192 static int put_both(int fd, int clen, int dlen, int pri){
1194 ctl.len = clen;
1195 dat.len = dlen;
1196 if(putmsg(fd, &ctl, &dat, pri) < 0){
1197 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1198 exit(STATE_UNKNOWN);
1199 }
1201 return 0;
1202 }
1204 /* open file descriptor and attach */
1205 static int dl_open(const char *dev, int unit, int *fd){
1206 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1208 if((*fd = open(dev, O_RDWR)) == -1){
1209 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1210 exit(STATE_UNKNOWN);
1211 }
1212 attach_req->dl_primitive = DL_ATTACH_REQ;
1213 attach_req->dl_ppa = unit;
1214 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1215 get_msg(*fd);
1216 return check_ctrl(DL_OK_ACK);
1217 }
1219 /* send DL_BIND_REQ */
1220 static int dl_bind(int fd, int sap, u_char *addr){
1221 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1222 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1224 bind_req->dl_primitive = DL_BIND_REQ;
1225 bind_req->dl_sap = sap;
1226 bind_req->dl_max_conind = 1;
1227 bind_req->dl_service_mode = DL_CLDLS;
1228 bind_req->dl_conn_mgmt = 0;
1229 bind_req->dl_xidtest_flg = 0;
1230 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1231 get_msg(fd);
1232 if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1233 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1234 exit(STATE_UNKNOWN);
1235 }
1236 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1237 bind_ack->dl_addr_length);
1239 return 0;
1240 }
1242 /***********************************************************************
1243 * interface:
1244 * function mac_addr_dlpi - get the mac address of the interface with
1245 * type dev (eg lnc, hme) and unit (0, 1 ..)
1246 *
1247 * parameter: addr: an array of six bytes, has to be allocated by the caller
1248 *
1249 * return: 0 if OK, -1 if the address could not be determined
1250 *
1251 *
1252 ***********************************************************************/
1254 long mac_addr_dlpi( const char *dev, int unit, u_char *addr){
1255 int fd;
1256 u_char mac_addr[25];
1258 if(GOT_ERR != dl_open(dev, unit, &fd)){
1259 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1260 bcopy( mac_addr, addr, 6);
1261 return 0;
1262 }
1263 }
1264 close(fd);
1266 return -1;
1267 }
1269 /* Kompf 2000-2003 */
1270 #endif
1273 /* print usage help */
1274 void print_help(void){
1276 print_revision(progname,revision);
1278 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1279 printf (COPYRIGHT, copyright, email);
1281 printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1283 printf ("\n\n");
1285 print_usage();
1287 printf (_(UT_HELP_VRSN));
1289 printf (_(UT_VERBOSE));
1291 printf (" %s\n", "-s, --serverip=IPADDRESS");
1292 printf (" %s\n", _("IP address of DHCP server that we must hear from"));
1293 printf (" %s\n", "-r, --requestedip=IPADDRESS");
1294 printf (" %s\n", _("IP address that should be offered by at least one DHCP server"));
1295 printf (" %s\n", "-t, --timeout=INTEGER");
1296 printf (" %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1297 printf (" %s\n", "-i, --interface=STRING");
1298 printf (" %s\n", _("Interface to to use for listening (i.e. eth0)"));
1300 return;
1301 }
1304 void
1305 print_usage(void){
1307 printf (_("Usage:"));
1308 printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1310 return;
1311 }