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
189 #define DHCP_INFINITE_TIME 0xFFFFFFFF
191 #define DHCP_BROADCAST_FLAG 32768
193 #define DHCP_SERVER_PORT 67
194 #define DHCP_CLIENT_PORT 68
196 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
197 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
199 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
201 char network_interface_name[IFNAMSIZ]="eth0";
203 u_int32_t packet_xid=0;
205 u_int32_t dhcp_lease_time=0;
206 u_int32_t dhcp_renewal_time=0;
207 u_int32_t dhcp_rebinding_time=0;
209 int dhcpoffer_timeout=2;
211 dhcp_offer *dhcp_offer_list=NULL;
212 requested_server *requested_server_list=NULL;
214 int valid_responses=0; /* number of valid DHCPOFFERs we received */
215 int requested_servers=0;
216 int requested_responses=0;
218 int request_specific_address=FALSE;
219 int received_requested_address=FALSE;
220 int verbose=0;
221 struct in_addr requested_address;
224 int process_arguments(int, char **);
225 int call_getopt(int, char **);
226 int validate_arguments(void);
227 void print_usage(void);
228 void print_help(void);
230 int get_hardware_address(int,char *);
232 int send_dhcp_discover(int);
233 int get_dhcp_offer(int);
235 int get_results(void);
237 int add_dhcp_offer(struct in_addr,dhcp_packet *);
238 int free_dhcp_offer_list(void);
239 int free_requested_server_list(void);
241 int create_dhcp_socket(void);
242 int close_dhcp_socket(int);
243 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
244 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
248 int main(int argc, char **argv){
249 int dhcp_socket;
250 int result = STATE_UNKNOWN;
252 setlocale (LC_ALL, "");
253 bindtextdomain (PACKAGE, LOCALEDIR);
254 textdomain (PACKAGE);
256 if(process_arguments(argc,argv)!=OK){
257 usage4 (_("Could not parse arguments"));
258 }
260 /* create socket for DHCP communications */
261 dhcp_socket=create_dhcp_socket();
263 /* get hardware address of client machine */
264 get_hardware_address(dhcp_socket,network_interface_name);
266 /* send DHCPDISCOVER packet */
267 send_dhcp_discover(dhcp_socket);
269 /* wait for a DHCPOFFER packet */
270 get_dhcp_offer(dhcp_socket);
272 /* close socket we created */
273 close_dhcp_socket(dhcp_socket);
275 /* determine state/plugin output to return */
276 result=get_results();
278 /* free allocated memory */
279 free_dhcp_offer_list();
280 free_requested_server_list();
282 return result;
283 }
287 /* determines hardware address on client machine */
288 int get_hardware_address(int sock,char *interface_name){
290 int i;
292 #if defined(__linux__)
293 struct ifreq ifr;
295 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
297 /* try and grab hardware address of requested interface */
298 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
299 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
300 exit(STATE_UNKNOWN);
301 }
303 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
305 #elif defined(__bsd__)
306 /* King 2004 see ACKNOWLEDGEMENTS */
308 int mib[6], len;
309 char *buf;
310 unsigned char *ptr;
311 struct if_msghdr *ifm;
312 struct sockaddr_dl *sdl;
314 mib[0] = CTL_NET;
315 mib[1] = AF_ROUTE;
316 mib[2] = 0;
317 mib[3] = AF_LINK;
318 mib[4] = NET_RT_IFLIST;
320 if((mib[5] = if_nametoindex(interface_name)) == 0){
321 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
322 exit(STATE_UNKNOWN);
323 }
325 if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
326 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
327 exit(STATE_UNKNOWN);
328 }
330 if((buf = malloc(len)) == NULL){
331 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
332 exit(4);
333 }
335 if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
336 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
337 exit(STATE_UNKNOWN);
338 }
340 ifm = (struct if_msghdr *)buf;
341 sdl = (struct sockaddr_dl *)(ifm + 1);
342 ptr = (unsigned char *)LLADDR(sdl);
343 memcpy(&client_hardware_address[0], ptr, 6) ;
344 /* King 2004 */
346 #elif defined(__sun__) || defined(__solaris__)
348 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
349 long stat;
350 char dev[20] = "/dev/";
351 char *p;
352 int unit;
354 for(p = interface_name; *p && isalpha(*p); p++)
355 /* no-op */ ;
356 if( p != '\0' ){
357 unit = atoi(p) ;
358 *p = '\0' ;
359 strncat(dev, interface_name, 6) ;
360 }
361 else{
362 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
363 exit(STATE_UNKNOWN);
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 }
371 #elif defined(__hpux__)
373 long stat;
374 char dev[20] = "/dev/dlpi" ;
375 int unit = 0;
377 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
378 if(stat != 0){
379 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
380 exit(STATE_UNKNOWN);
381 }
382 /* Kompf 2000-2003 */
384 #else
385 printf(_("Error: can't get MAC address for this architecture.\n"));
386 exit(STATE_UNKNOWN);
387 #endif
389 if(verbose){
390 printf(_("Hardware address: "));
391 for (i=0; i<6; ++i)
392 printf("%2.2x", client_hardware_address[i]);
393 printf( "\n");
394 }
396 return OK;
397 }
400 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
401 int send_dhcp_discover(int sock){
402 dhcp_packet discover_packet;
403 struct sockaddr_in sockaddr_broadcast;
406 /* clear the packet data structure */
407 bzero(&discover_packet,sizeof(discover_packet));
410 /* boot request flag (backward compatible with BOOTP servers) */
411 discover_packet.op=BOOTREQUEST;
413 /* hardware address type */
414 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
416 /* length of our hardware address */
417 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
419 discover_packet.hops=0;
421 /* transaction id is supposed to be random */
422 srand(time(NULL));
423 packet_xid=random();
424 discover_packet.xid=htonl(packet_xid);
426 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
427 /* downright bizzarre... */
428 ntohl(discover_packet.xid);
430 /*discover_packet.secs=htons(65535);*/
431 discover_packet.secs=0xFF;
433 /* tell server it should broadcast its response */
434 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
436 /* our hardware address */
437 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
439 /* first four bytes of options field is magic cookie (as per RFC 2132) */
440 discover_packet.options[0]='\x63';
441 discover_packet.options[1]='\x82';
442 discover_packet.options[2]='\x53';
443 discover_packet.options[3]='\x63';
445 /* DHCP message type is embedded in options field */
446 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
447 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
448 discover_packet.options[6]=DHCPDISCOVER;
450 /* the IP address we're requesting */
451 if(request_specific_address==TRUE){
452 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
453 discover_packet.options[8]='\x04';
454 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
455 }
457 /* send the DHCPDISCOVER packet to broadcast address */
458 sockaddr_broadcast.sin_family=AF_INET;
459 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
460 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
461 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
464 if(verbose){
465 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
466 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
467 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
468 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
469 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
470 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
471 }
473 /* send the DHCPDISCOVER packet out */
474 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
476 if(verbose)
477 printf("\n\n");
479 return OK;
480 }
485 /* waits for a DHCPOFFER message from one or more DHCP servers */
486 int get_dhcp_offer(int sock){
487 dhcp_packet offer_packet;
488 struct sockaddr_in source;
489 struct sockaddr_in via;
490 int result=OK;
491 int responses=0;
492 int x;
493 time_t start_time;
494 time_t current_time;
496 time(&start_time);
498 /* receive as many responses as we can */
499 for(responses=0,valid_responses=0;;){
501 time(¤t_time);
502 if((current_time-start_time)>=dhcpoffer_timeout)
503 break;
505 if(verbose)
506 printf("\n\n");
508 bzero(&source,sizeof(source));
509 bzero(&via,sizeof(via));
510 bzero(&offer_packet,sizeof(offer_packet));
512 result=OK;
513 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
515 if(result!=OK){
516 if(verbose)
517 printf(_("Result=ERROR\n"));
519 continue;
520 }
521 else{
522 if(verbose)
523 printf(_("Result=OK\n"));
525 responses++;
526 }
528 /* The "source" is either a server or a relay. */
529 /* Save a copy of "source" into "via" even if it's via itself */
530 memcpy(&via,&source,sizeof(source)) ;
532 /* If siaddr is non-zero, set "source" to siaddr */
533 if(offer_packet.siaddr.s_addr != 0L){
534 source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
535 }
537 if(verbose){
538 printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
539 printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
540 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
541 }
543 /* check packet xid to see if its the same as the one we used in the discover packet */
544 if(ntohl(offer_packet.xid)!=packet_xid){
545 if(verbose)
546 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
548 continue;
549 }
551 /* check hardware address */
552 result=OK;
553 if(verbose)
554 printf("DHCPOFFER chaddr: ");
556 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
557 if(verbose)
558 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
560 if(offer_packet.chaddr[x]!=client_hardware_address[x])
561 result=ERROR;
562 }
563 if(verbose)
564 printf("\n");
566 if(result==ERROR){
567 if(verbose)
568 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
570 continue;
571 }
573 if(verbose){
574 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
575 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
576 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
577 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
578 }
580 add_dhcp_offer(source.sin_addr,&offer_packet);
582 valid_responses++;
583 }
585 if(verbose){
586 printf(_("Total responses seen on the wire: %d\n"),responses);
587 printf(_("Valid responses for this machine: %d\n"),valid_responses);
588 }
590 return OK;
591 }
595 /* sends a DHCP packet */
596 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
597 int result;
599 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
601 if(verbose)
602 printf(_("send_dhcp_packet result: %d\n"),result);
604 if(result<0)
605 return ERROR;
607 return OK;
608 }
612 /* receives a DHCP packet */
613 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
614 struct timeval tv;
615 fd_set readfds;
616 int recv_result;
617 socklen_t address_size;
618 struct sockaddr_in source_address;
621 /* wait for data to arrive (up time timeout) */
622 tv.tv_sec=timeout;
623 tv.tv_usec=0;
624 FD_ZERO(&readfds);
625 FD_SET(sock,&readfds);
626 select(sock+1,&readfds,NULL,NULL,&tv);
628 /* make sure some data has arrived */
629 if(!FD_ISSET(sock,&readfds)){
630 if(verbose)
631 printf(_("No (more) data received\n"));
632 return ERROR;
633 }
635 else{
637 /* why do we need to peek first? i don't know, its a hack. without it, the source address of the first packet received was
638 not being interpreted correctly. sigh... */
639 bzero(&source_address,sizeof(source_address));
640 address_size=sizeof(source_address);
641 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
642 if(verbose)
643 printf("recv_result_1: %d\n",recv_result);
644 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
645 if(verbose)
646 printf("recv_result_2: %d\n",recv_result);
648 if(recv_result==-1){
649 if(verbose){
650 printf(_("recvfrom() failed, "));
651 printf("errno: (%d) -> %s\n",errno,strerror(errno));
652 }
653 return ERROR;
654 }
655 else{
656 if(verbose){
657 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
658 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
659 }
661 memcpy(address,&source_address,sizeof(source_address));
662 return OK;
663 }
664 }
666 return OK;
667 }
670 /* creates a socket for DHCP communication */
671 int create_dhcp_socket(void){
672 struct sockaddr_in myname;
673 struct ifreq interface;
674 int sock;
675 int flag=1;
677 /* Set up the address we're going to bind to. */
678 bzero(&myname,sizeof(myname));
679 myname.sin_family=AF_INET;
680 myname.sin_port=htons(DHCP_CLIENT_PORT);
681 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
682 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
684 /* create a socket for DHCP communications */
685 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
686 if(sock<0){
687 printf(_("Error: Could not create socket!\n"));
688 exit(STATE_UNKNOWN);
689 }
691 if(verbose)
692 printf("DHCP socket: %d\n",sock);
694 /* set the reuse address flag so we don't get errors when restarting */
695 flag=1;
696 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
697 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
698 exit(STATE_UNKNOWN);
699 }
701 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
702 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
703 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
704 exit(STATE_UNKNOWN);
705 }
707 /* bind socket to interface */
708 #if defined(__linux__)
709 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
710 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
711 printf(_("Error: Could not bind socket to interface %s. Check your privileges...\n"),network_interface_name);
712 exit(STATE_UNKNOWN);
713 }
715 #else
716 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
717 #endif
719 /* bind the socket */
720 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
721 printf(_("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n"),DHCP_CLIENT_PORT);
722 exit(STATE_UNKNOWN);
723 }
725 return sock;
726 }
729 /* closes DHCP socket */
730 int close_dhcp_socket(int sock){
732 close(sock);
734 return OK;
735 }
738 /* adds a requested server address to list in memory */
739 int add_requested_server(struct in_addr server_address){
740 requested_server *new_server;
742 new_server=(requested_server *)malloc(sizeof(requested_server));
743 if(new_server==NULL)
744 return ERROR;
746 new_server->server_address=server_address;
747 new_server->answered=FALSE;
749 new_server->next=requested_server_list;
750 requested_server_list=new_server;
752 requested_servers++;
754 if(verbose)
755 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
757 return OK;
758 }
763 /* adds a DHCP OFFER to list in memory */
764 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
765 dhcp_offer *new_offer;
766 int x;
767 unsigned option_type;
768 unsigned option_length;
769 struct in_addr serv_ident = {0};
771 if(offer_packet==NULL)
772 return ERROR;
774 /* process all DHCP options present in the packet */
775 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
777 /* end of options (0 is really just a pad, but bail out anyway) */
778 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
779 break;
781 /* get option type */
782 option_type=offer_packet->options[x++];
784 /* get option length */
785 option_length=offer_packet->options[x++];
787 if(verbose)
788 printf("Option: %d (0x%02X)\n",option_type,option_length);
790 /* get option data */
791 switch(option_type){
792 case DHCP_OPTION_LEASE_TIME:
793 memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
794 dhcp_lease_time = ntohl(dhcp_lease_time);
795 break;
796 case DHCP_OPTION_RENEWAL_TIME:
797 memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
798 dhcp_renewal_time = ntohl(dhcp_renewal_time);
799 break;
800 case DHCP_OPTION_REBINDING_TIME:
801 memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
802 dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
803 break;
804 case DHCP_OPTION_SERVER_IDENTIFIER:
805 memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr));
806 break;
807 }
809 /* skip option data we're ignoring */
810 if(option_type!=DHCP_OPTION_REBINDING_TIME)
811 x+=option_length;
812 }
814 if(verbose){
815 if(dhcp_lease_time==DHCP_INFINITE_TIME)
816 printf(_("Lease Time: Infinite\n"));
817 else
818 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
819 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
820 printf(_("Renewal Time: Infinite\n"));
821 else
822 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
823 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
824 printf(_("Rebinding Time: Infinite\n"));
825 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
826 }
828 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
830 if(new_offer==NULL)
831 return ERROR;
833 /*
834 * RFC 2131 (2.) says: "DHCP clarifies the interpretation of the
835 * 'siaddr' field as the address of the server to use in the next step
836 * of the client's bootstrap process. A DHCP server may return its own
837 * address in the 'siaddr' field, if the server is prepared to supply
838 * the next bootstrap service (e.g., delivery of an operating system
839 * executable image). A DHCP server always returns its own address in
840 * the 'server identifier' option." 'serv_ident' is the 'server
841 * identifier' option, 'source' is the 'siaddr' field or (if 'siaddr'
842 * wasn't available) the IP address we received the DHCPOFFER from. If
843 * 'serv_ident' isn't available for some reason, we use 'source'.
844 */
845 new_offer->server_address=serv_ident.s_addr?serv_ident:source;
846 new_offer->offered_address=offer_packet->yiaddr;
847 new_offer->lease_time=dhcp_lease_time;
848 new_offer->renewal_time=dhcp_renewal_time;
849 new_offer->rebinding_time=dhcp_rebinding_time;
852 if(verbose){
853 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
854 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
855 }
857 /* add new offer to head of list */
858 new_offer->next=dhcp_offer_list;
859 dhcp_offer_list=new_offer;
861 return OK;
862 }
865 /* frees memory allocated to DHCP OFFER list */
866 int free_dhcp_offer_list(void){
867 dhcp_offer *this_offer;
868 dhcp_offer *next_offer;
870 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
871 next_offer=this_offer->next;
872 free(this_offer);
873 }
875 return OK;
876 }
879 /* frees memory allocated to requested server list */
880 int free_requested_server_list(void){
881 requested_server *this_server;
882 requested_server *next_server;
884 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
885 next_server=this_server->next;
886 free(this_server);
887 }
889 return OK;
890 }
893 /* gets state and plugin output to return */
894 int get_results(void){
895 dhcp_offer *temp_offer;
896 requested_server *temp_server;
897 int result;
898 u_int32_t max_lease_time=0;
900 received_requested_address=FALSE;
902 /* checks responses from requested servers */
903 requested_responses=0;
904 if(requested_servers>0){
906 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
908 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
910 /* get max lease time we were offered */
911 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
912 max_lease_time=temp_offer->lease_time;
914 /* see if we got the address we requested */
915 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
916 received_requested_address=TRUE;
918 /* see if the servers we wanted a response from talked to us or not */
919 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
920 if(verbose){
921 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
922 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
923 if(temp_server->answered)
924 printf(_(" (duplicate)"));
925 printf(_("\n"));
926 }
927 if(temp_server->answered == FALSE){
928 requested_responses++;
929 temp_server->answered=TRUE;
930 }
931 }
932 }
933 }
935 }
937 /* else check and see if we got our requested address from any server */
938 else{
940 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
942 /* get max lease time we were offered */
943 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
944 max_lease_time=temp_offer->lease_time;
946 /* see if we got the address we requested */
947 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
948 received_requested_address=TRUE;
949 }
950 }
952 result=STATE_OK;
953 if(valid_responses==0)
954 result=STATE_CRITICAL;
955 else if(requested_servers>0 && requested_responses==0)
956 result=STATE_CRITICAL;
957 else if(requested_responses<requested_servers)
958 result=STATE_WARNING;
959 else if(request_specific_address==TRUE && received_requested_address==FALSE)
960 result=STATE_WARNING;
962 if(result==0) /* garrett honeycutt 2005 */
963 printf("OK: ");
964 else if(result==1)
965 printf("WARNING: ");
966 else if(result==2)
967 printf("CRITICAL: ");
968 else if(result==3)
969 printf("UNKNOWN: ");
971 /* we didn't receive any DHCPOFFERs */
972 if(dhcp_offer_list==NULL){
973 printf(_("No DHCPOFFERs were received.\n"));
974 return result;
975 }
977 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
979 if(requested_servers>0)
980 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
982 if(request_specific_address==TRUE)
983 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
985 printf(_(", max lease time = "));
986 if(max_lease_time==DHCP_INFINITE_TIME)
987 printf(_("Infinity"));
988 else
989 printf("%lu sec",(unsigned long)max_lease_time);
991 printf(".\n");
993 return result;
994 }
997 /* process command-line arguments */
998 int process_arguments(int argc, char **argv){
999 int c;
1001 if(argc<1)
1002 return ERROR;
1004 c=0;
1005 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1007 /*
1008 if(is_option(argv[c]))
1009 continue;
1010 */
1011 }
1013 return validate_arguments();
1014 }
1018 int call_getopt(int argc, char **argv){
1019 int c=0;
1020 int i=0;
1021 struct in_addr ipaddress;
1023 int option_index = 0;
1024 static struct option long_options[] =
1025 {
1026 {"serverip", required_argument,0,'s'},
1027 {"requestedip", required_argument,0,'r'},
1028 {"timeout", required_argument,0,'t'},
1029 {"interface", required_argument,0,'i'},
1030 {"verbose", no_argument, 0,'v'},
1031 {"version", no_argument, 0,'V'},
1032 {"help", no_argument, 0,'h'},
1033 {0,0,0,0}
1034 };
1036 while(1){
1037 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1039 i++;
1041 if(c==-1||c==EOF||c==1)
1042 break;
1044 switch(c){
1045 case 'w':
1046 case 'r':
1047 case 't':
1048 case 'i':
1049 i++;
1050 break;
1051 default:
1052 break;
1053 }
1055 switch(c){
1057 case 's': /* DHCP server address */
1058 if(inet_aton(optarg,&ipaddress))
1059 add_requested_server(ipaddress);
1060 /*
1061 else
1062 usage("Invalid server IP address\n");
1063 */
1064 break;
1066 case 'r': /* address we are requested from DHCP servers */
1067 if(inet_aton(optarg,&ipaddress)){
1068 requested_address=ipaddress;
1069 request_specific_address=TRUE;
1070 }
1071 /*
1072 else
1073 usage("Invalid requested IP address\n");
1074 */
1075 break;
1077 case 't': /* timeout */
1079 /*
1080 if(is_intnonneg(optarg))
1081 */
1082 if(atoi(optarg)>0)
1083 dhcpoffer_timeout=atoi(optarg);
1084 /*
1085 else
1086 usage("Time interval must be a nonnegative integer\n");
1087 */
1088 break;
1090 case 'i': /* interface name */
1092 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1093 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1095 break;
1097 case 'V': /* version */
1098 print_revision(progname,revision);
1099 exit(STATE_OK);
1101 case 'h': /* help */
1102 print_help();
1103 exit(STATE_OK);
1105 case 'v': /* verbose */
1106 verbose=1;
1107 break;
1109 case '?': /* help */
1110 usage5 ();
1111 break;
1113 default:
1114 break;
1115 }
1116 }
1118 return i;
1119 }
1122 int validate_arguments(void){
1124 return OK;
1125 }
1128 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1129 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1131 /* get a message from a stream; return type of message */
1132 static int get_msg(int fd){
1133 int flags = 0;
1134 int res, ret;
1135 ctl_area[0] = 0;
1136 dat_area[0] = 0;
1137 ret = 0;
1138 res = getmsg(fd, &ctl, &dat, &flags);
1140 if(res < 0){
1141 if(errno == EINTR){
1142 return(GOT_INTR);
1143 }
1144 else{
1145 printf("%s\n", "get_msg FAILED.");
1146 return(GOT_ERR);
1147 }
1148 }
1149 if(ctl.len > 0){
1150 ret |= GOT_CTRL;
1151 }
1152 if(dat.len > 0){
1153 ret |= GOT_DATA;
1154 }
1156 return(ret);
1157 }
1159 /* verify that dl_primitive in ctl_area = prim */
1160 static int check_ctrl(int prim){
1161 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1163 if(err_ack->dl_primitive != prim){
1164 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1165 exit(STATE_UNKNOWN);
1166 }
1168 return 0;
1169 }
1171 /* put a control message on a stream */
1172 static int put_ctrl(int fd, int len, int pri){
1174 ctl.len = len;
1175 if(putmsg(fd, &ctl, 0, pri) < 0){
1176 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1177 exit(STATE_UNKNOWN);
1178 }
1180 return 0;
1181 }
1183 /* put a control + data message on a stream */
1184 static int put_both(int fd, int clen, int dlen, int pri){
1186 ctl.len = clen;
1187 dat.len = dlen;
1188 if(putmsg(fd, &ctl, &dat, pri) < 0){
1189 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1190 exit(STATE_UNKNOWN);
1191 }
1193 return 0;
1194 }
1196 /* open file descriptor and attach */
1197 static int dl_open(const char *dev, int unit, int *fd){
1198 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1200 if((*fd = open(dev, O_RDWR)) == -1){
1201 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1202 exit(STATE_UNKNOWN);
1203 }
1204 attach_req->dl_primitive = DL_ATTACH_REQ;
1205 attach_req->dl_ppa = unit;
1206 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1207 get_msg(*fd);
1208 return check_ctrl(DL_OK_ACK);
1209 }
1211 /* send DL_BIND_REQ */
1212 static int dl_bind(int fd, int sap, u_char *addr){
1213 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1214 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1216 bind_req->dl_primitive = DL_BIND_REQ;
1217 bind_req->dl_sap = sap;
1218 bind_req->dl_max_conind = 1;
1219 bind_req->dl_service_mode = DL_CLDLS;
1220 bind_req->dl_conn_mgmt = 0;
1221 bind_req->dl_xidtest_flg = 0;
1222 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1223 get_msg(fd);
1224 if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1225 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1226 exit(STATE_UNKNOWN);
1227 }
1228 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1229 bind_ack->dl_addr_length);
1231 return 0;
1232 }
1234 /***********************************************************************
1235 * interface:
1236 * function mac_addr_dlpi - get the mac address of the interface with
1237 * type dev (eg lnc, hme) and unit (0, 1 ..)
1238 *
1239 * parameter: addr: an array of six bytes, has to be allocated by the caller
1240 *
1241 * return: 0 if OK, -1 if the address could not be determined
1242 *
1243 *
1244 ***********************************************************************/
1246 long mac_addr_dlpi( const char *dev, int unit, u_char *addr){
1247 int fd;
1248 u_char mac_addr[25];
1250 if(GOT_ERR != dl_open(dev, unit, &fd)){
1251 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1252 bcopy( mac_addr, addr, 6);
1253 return 0;
1254 }
1255 }
1256 close(fd);
1258 return -1;
1259 }
1261 /* Kompf 2000-2003 */
1262 #endif
1265 /* print usage help */
1266 void print_help(void){
1268 print_revision(progname,revision);
1270 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1271 printf (COPYRIGHT, copyright, email);
1273 printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1275 printf ("\n\n");
1277 print_usage();
1279 printf (_(UT_HELP_VRSN));
1281 printf (_(UT_VERBOSE));
1283 printf (" %s\n", "-s, --serverip=IPADDRESS");
1284 printf (" %s\n", _("IP address of DHCP server that we must hear from"));
1285 printf (" %s\n", "-r, --requestedip=IPADDRESS");
1286 printf (" %s\n", _("IP address that should be offered by at least one DHCP server"));
1287 printf (" %s\n", "-t, --timeout=INTEGER");
1288 printf (" %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1289 printf (" %s\n", "-i, --interface=STRING");
1290 printf (" %s\n", _("Interface to to use for listening (i.e. eth0)"));
1292 return;
1293 }
1296 void
1297 print_usage(void){
1299 printf (_("Usage:"));
1300 printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1302 return;
1303 }