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/sysctl.h>
72 #include <net/if_dl.h>
74 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
76 #define INSAP 22
77 #define OUTSAP 24
79 #include <signal.h>
80 #include <ctype.h>
81 #include <sys/stropts.h>
82 #include <sys/poll.h>
83 #include <sys/dlpi.h>
85 #define bcopy(source, destination, length) memcpy(destination, source, length)
87 #define AREA_SZ 5000 /* buffer length in bytes */
88 static u_long ctl_area[AREA_SZ];
89 static u_long dat_area[AREA_SZ];
90 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
91 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
93 #define GOT_CTRL 1
94 #define GOT_DATA 2
95 #define GOT_BOTH 3
96 #define GOT_INTR 4
97 #define GOT_ERR 128
99 #define u_int8_t uint8_t
100 #define u_int16_t uint16_t
101 #define u_int32_t uint32_t
103 static int get_msg(int);
104 static int check_ctrl(int);
105 static int put_ctrl(int, int, int);
106 static int put_both(int, int, int, int);
107 static int dl_open(const char *, int, int *);
108 static int dl_bind(int, int, u_char *);
109 long mac_addr_dlpi( const char *, int, u_char *);
111 #endif
115 /**** Common definitions ****/
117 #define OK 0
118 #define ERROR -1
120 #define FALSE 0
121 #define TRUE 1
124 /**** DHCP definitions ****/
126 #define MAX_DHCP_CHADDR_LENGTH 16
127 #define MAX_DHCP_SNAME_LENGTH 64
128 #define MAX_DHCP_FILE_LENGTH 128
129 #define MAX_DHCP_OPTIONS_LENGTH 312
132 typedef struct dhcp_packet_struct{
133 u_int8_t op; /* packet type */
134 u_int8_t htype; /* type of hardware address for this machine (Ethernet, etc) */
135 u_int8_t hlen; /* length of hardware address (of this machine) */
136 u_int8_t hops; /* hops */
137 u_int32_t xid; /* random transaction id number - chosen by this machine */
138 u_int16_t secs; /* seconds used in timing */
139 u_int16_t flags; /* flags */
140 struct in_addr ciaddr; /* IP address of this machine (if we already have one) */
141 struct in_addr yiaddr; /* IP address of this machine (offered by the DHCP server) */
142 struct in_addr siaddr; /* IP address of DHCP server */
143 struct in_addr giaddr; /* IP address of DHCP relay */
144 unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH]; /* hardware address of this machine */
145 char sname [MAX_DHCP_SNAME_LENGTH]; /* name of DHCP server */
146 char file [MAX_DHCP_FILE_LENGTH]; /* boot file name (used for diskless booting?) */
147 char options[MAX_DHCP_OPTIONS_LENGTH]; /* options */
148 }dhcp_packet;
151 typedef struct dhcp_offer_struct{
152 struct in_addr server_address; /* address of DHCP server that sent this offer */
153 struct in_addr offered_address; /* the IP address that was offered to us */
154 u_int32_t lease_time; /* lease time in seconds */
155 u_int32_t renewal_time; /* renewal time in seconds */
156 u_int32_t rebinding_time; /* rebinding time in seconds */
157 struct dhcp_offer_struct *next;
158 }dhcp_offer;
161 typedef struct requested_server_struct{
162 struct in_addr server_address;
163 int answered;
164 struct requested_server_struct *next;
165 }requested_server;
168 #define BOOTREQUEST 1
169 #define BOOTREPLY 2
171 #define DHCPDISCOVER 1
172 #define DHCPOFFER 2
173 #define DHCPREQUEST 3
174 #define DHCPDECLINE 4
175 #define DHCPACK 5
176 #define DHCPNACK 6
177 #define DHCPRELEASE 7
179 #define DHCP_OPTION_MESSAGE_TYPE 53
180 #define DHCP_OPTION_HOST_NAME 12
181 #define DHCP_OPTION_BROADCAST_ADDRESS 28
182 #define DHCP_OPTION_REQUESTED_ADDRESS 50
183 #define DHCP_OPTION_LEASE_TIME 51
184 #define DHCP_OPTION_RENEWAL_TIME 58
185 #define DHCP_OPTION_REBINDING_TIME 59
187 #define DHCP_INFINITE_TIME 0xFFFFFFFF
189 #define DHCP_BROADCAST_FLAG 32768
191 #define DHCP_SERVER_PORT 67
192 #define DHCP_CLIENT_PORT 68
194 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
195 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
197 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
199 char network_interface_name[IFNAMSIZ]="eth0";
201 u_int32_t packet_xid=0;
203 u_int32_t dhcp_lease_time=0;
204 u_int32_t dhcp_renewal_time=0;
205 u_int32_t dhcp_rebinding_time=0;
207 int dhcpoffer_timeout=2;
209 dhcp_offer *dhcp_offer_list=NULL;
210 requested_server *requested_server_list=NULL;
212 int valid_responses=0; /* number of valid DHCPOFFERs we received */
213 int requested_servers=0;
214 int requested_responses=0;
216 int request_specific_address=FALSE;
217 int received_requested_address=FALSE;
218 int verbose=0;
219 struct in_addr requested_address;
222 int process_arguments(int, char **);
223 int call_getopt(int, char **);
224 int validate_arguments(void);
225 void print_usage(void);
226 void print_help(void);
228 int get_hardware_address(int,char *);
230 int send_dhcp_discover(int);
231 int get_dhcp_offer(int);
233 int get_results(void);
235 int add_dhcp_offer(struct in_addr,dhcp_packet *);
236 int free_dhcp_offer_list(void);
237 int free_requested_server_list(void);
239 int create_dhcp_socket(void);
240 int close_dhcp_socket(int);
241 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
242 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
246 int main(int argc, char **argv){
247 int dhcp_socket;
248 int result = STATE_UNKNOWN;
250 setlocale (LC_ALL, "");
251 bindtextdomain (PACKAGE, LOCALEDIR);
252 textdomain (PACKAGE);
254 if(process_arguments(argc,argv)!=OK){
255 usage4 (_("Could not parse arguments"));
256 }
258 /* create socket for DHCP communications */
259 dhcp_socket=create_dhcp_socket();
261 /* get hardware address of client machine */
262 get_hardware_address(dhcp_socket,network_interface_name);
264 /* send DHCPDISCOVER packet */
265 send_dhcp_discover(dhcp_socket);
267 /* wait for a DHCPOFFER packet */
268 get_dhcp_offer(dhcp_socket);
270 /* close socket we created */
271 close_dhcp_socket(dhcp_socket);
273 /* determine state/plugin output to return */
274 result=get_results();
276 /* free allocated memory */
277 free_dhcp_offer_list();
278 free_requested_server_list();
280 return result;
281 }
285 /* determines hardware address on client machine */
286 int get_hardware_address(int sock,char *interface_name){
288 int i;
290 #if defined(__linux__)
291 struct ifreq ifr;
293 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
295 /* try and grab hardware address of requested interface */
296 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
297 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
298 exit(STATE_UNKNOWN);
299 }
301 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
303 #elif defined(__bsd__)
304 /* King 2004 see ACKNOWLEDGEMENTS */
306 int mib[6], len;
307 char *buf;
308 unsigned char *ptr;
309 struct if_msghdr *ifm;
310 struct sockaddr_dl *sdl;
312 mib[0] = CTL_NET;
313 mib[1] = AF_ROUTE;
314 mib[2] = 0;
315 mib[3] = AF_LINK;
316 mib[4] = NET_RT_IFLIST;
318 if((mib[5] = if_nametoindex(interface_name)) == 0){
319 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
320 exit(STATE_UNKNOWN);
321 }
323 if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
324 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
325 exit(STATE_UNKNOWN);
326 }
328 if((buf = malloc(len)) == NULL){
329 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
330 exit(4);
331 }
333 if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
334 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
335 exit(STATE_UNKNOWN);
336 }
338 ifm = (struct if_msghdr *)buf;
339 sdl = (struct sockaddr_dl *)(ifm + 1);
340 ptr = (unsigned char *)LLADDR(sdl);
341 memcpy(&client_hardware_address[0], ptr, 6) ;
342 /* King 2004 */
344 #elif defined(__sun__) || defined(__solaris__)
346 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
347 long stat;
348 char dev[20] = "/dev/";
349 char *p;
350 int unit;
352 for(p = interface_name; *p && isalpha(*p); p++)
353 /* no-op */ ;
354 if( p != '\0' ){
355 unit = atoi(p) ;
356 *p = '\0' ;
357 strncat(dev, interface_name, 6) ;
358 }
359 else{
360 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
361 exit(STATE_UNKNOWN);
362 }
363 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
364 if(stat != 0){
365 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
366 exit(STATE_UNKNOWN);
367 }
369 #elif defined(__hpux__)
371 long stat;
372 char dev[20] = "/dev/dlpi" ;
373 int unit = 0;
375 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
376 if(stat != 0){
377 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
378 exit(STATE_UNKNOWN);
379 }
380 /* Kompf 2000-2003 */
382 #else
383 printf(_("Error: can't get MAC address for this architecture.\n"));
384 exit(STATE_UNKNOWN);
385 #endif
387 if(verbose){
388 printf(_("Hardware address: "));
389 for (i=0; i<6; ++i)
390 printf("%2.2x", client_hardware_address[i]);
391 printf( "\n");
392 }
394 return OK;
395 }
398 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
399 int send_dhcp_discover(int sock){
400 dhcp_packet discover_packet;
401 struct sockaddr_in sockaddr_broadcast;
404 /* clear the packet data structure */
405 bzero(&discover_packet,sizeof(discover_packet));
408 /* boot request flag (backward compatible with BOOTP servers) */
409 discover_packet.op=BOOTREQUEST;
411 /* hardware address type */
412 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
414 /* length of our hardware address */
415 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
417 discover_packet.hops=0;
419 /* transaction id is supposed to be random */
420 srand(time(NULL));
421 packet_xid=random();
422 discover_packet.xid=htonl(packet_xid);
424 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
425 /* downright bizzarre... */
426 ntohl(discover_packet.xid);
428 /*discover_packet.secs=htons(65535);*/
429 discover_packet.secs=0xFF;
431 /* tell server it should broadcast its response */
432 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
434 /* our hardware address */
435 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
437 /* first four bytes of options field is magic cookie (as per RFC 2132) */
438 discover_packet.options[0]='\x63';
439 discover_packet.options[1]='\x82';
440 discover_packet.options[2]='\x53';
441 discover_packet.options[3]='\x63';
443 /* DHCP message type is embedded in options field */
444 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
445 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
446 discover_packet.options[6]=DHCPDISCOVER;
448 /* the IP address we're requesting */
449 if(request_specific_address==TRUE){
450 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
451 discover_packet.options[8]='\x04';
452 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
453 }
455 /* send the DHCPDISCOVER packet to broadcast address */
456 sockaddr_broadcast.sin_family=AF_INET;
457 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
458 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
459 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
462 if(verbose){
463 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
464 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
465 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
466 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
467 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
468 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
469 }
471 /* send the DHCPDISCOVER packet out */
472 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
474 if(verbose)
475 printf("\n\n");
477 return OK;
478 }
483 /* waits for a DHCPOFFER message from one or more DHCP servers */
484 int get_dhcp_offer(int sock){
485 dhcp_packet offer_packet;
486 struct sockaddr_in source;
487 struct sockaddr_in via;
488 int result=OK;
489 int timeout=1;
490 int responses=0;
491 int x;
492 time_t start_time;
493 time_t current_time;
495 time(&start_time);
497 /* receive as many responses as we can */
498 for(responses=0,valid_responses=0;;){
500 time(¤t_time);
501 if((current_time-start_time)>=dhcpoffer_timeout)
502 break;
504 if(verbose)
505 printf("\n\n");
507 bzero(&source,sizeof(source));
508 bzero(&via,sizeof(via));
509 bzero(&offer_packet,sizeof(offer_packet));
511 result=OK;
512 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
514 if(result!=OK){
515 if(verbose)
516 printf(_("Result=ERROR\n"));
518 continue;
519 }
520 else{
521 if(verbose)
522 printf(_("Result=OK\n"));
524 responses++;
525 }
527 /* The "source" is either a server or a relay. */
528 /* Save a copy of "source" into "via" even if it's via itself */
529 memcpy(&via,&source,sizeof(source)) ;
531 /* If siaddr is non-zero, set "source" to siaddr */
532 if(offer_packet.siaddr.s_addr != 0L){
533 source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
534 }
536 if(verbose){
537 printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
538 printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
539 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
540 }
542 /* check packet xid to see if its the same as the one we used in the discover packet */
543 if(ntohl(offer_packet.xid)!=packet_xid){
544 if(verbose)
545 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
547 continue;
548 }
550 /* check hardware address */
551 result=OK;
552 if(verbose)
553 printf("DHCPOFFER chaddr: ");
555 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
556 if(verbose)
557 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
559 if(offer_packet.chaddr[x]!=client_hardware_address[x])
560 result=ERROR;
561 }
562 if(verbose)
563 printf("\n");
565 if(result==ERROR){
566 if(verbose)
567 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
569 continue;
570 }
572 if(verbose){
573 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
574 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
575 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
576 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
577 }
579 add_dhcp_offer(source.sin_addr,&offer_packet);
581 valid_responses++;
582 }
584 if(verbose){
585 printf(_("Total responses seen on the wire: %d\n"),responses);
586 printf(_("Valid responses for this machine: %d\n"),valid_responses);
587 }
589 return OK;
590 }
594 /* sends a DHCP packet */
595 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
596 struct sockaddr_in myname;
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 int y;
768 unsigned option_type;
769 unsigned option_length;
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 if(option_type==DHCP_OPTION_LEASE_TIME){
792 memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
793 dhcp_lease_time = ntohl(dhcp_lease_time);
794 }
795 if(option_type==DHCP_OPTION_RENEWAL_TIME){
796 memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
797 dhcp_renewal_time = ntohl(dhcp_renewal_time);
798 }
799 if(option_type==DHCP_OPTION_REBINDING_TIME){
800 memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
801 dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
802 }
804 /* skip option data we're ignoring */
805 else
806 for(y=0;y<option_length;y++,x++);
807 }
809 if(verbose){
810 if(dhcp_lease_time==DHCP_INFINITE_TIME)
811 printf(_("Lease Time: Infinite\n"));
812 else
813 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
814 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
815 printf(_("Renewal Time: Infinite\n"));
816 else
817 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
818 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
819 printf(_("Rebinding Time: Infinite\n"));
820 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
821 }
823 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
825 if(new_offer==NULL)
826 return ERROR;
828 new_offer->server_address=source;
829 new_offer->offered_address=offer_packet->yiaddr;
830 new_offer->lease_time=dhcp_lease_time;
831 new_offer->renewal_time=dhcp_renewal_time;
832 new_offer->rebinding_time=dhcp_rebinding_time;
835 if(verbose){
836 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
837 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
838 }
840 /* add new offer to head of list */
841 new_offer->next=dhcp_offer_list;
842 dhcp_offer_list=new_offer;
844 return OK;
845 }
848 /* frees memory allocated to DHCP OFFER list */
849 int free_dhcp_offer_list(void){
850 dhcp_offer *this_offer;
851 dhcp_offer *next_offer;
853 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
854 next_offer=this_offer->next;
855 free(this_offer);
856 }
858 return OK;
859 }
862 /* frees memory allocated to requested server list */
863 int free_requested_server_list(void){
864 requested_server *this_server;
865 requested_server *next_server;
867 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
868 next_server=this_server->next;
869 free(this_server);
870 }
872 return OK;
873 }
876 /* gets state and plugin output to return */
877 int get_results(void){
878 dhcp_offer *temp_offer;
879 requested_server *temp_server;
880 int result;
881 u_int32_t max_lease_time=0;
883 received_requested_address=FALSE;
885 /* checks responses from requested servers */
886 requested_responses=0;
887 if(requested_servers>0){
889 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
891 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
893 /* get max lease time we were offered */
894 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
895 max_lease_time=temp_offer->lease_time;
897 /* see if we got the address we requested */
898 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
899 received_requested_address=TRUE;
901 /* see if the servers we wanted a response from talked to us or not */
902 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
903 if(verbose){
904 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
905 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
906 if(temp_server->answered)
907 printf(_(" (duplicate)"));
908 printf(_("\n"));
909 }
910 if(temp_server->answered == FALSE){
911 requested_responses++;
912 temp_server->answered=TRUE;
913 }
914 }
915 }
916 }
918 }
920 /* else check and see if we got our requested address from any server */
921 else{
923 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
925 /* get max lease time we were offered */
926 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
927 max_lease_time=temp_offer->lease_time;
929 /* see if we got the address we requested */
930 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
931 received_requested_address=TRUE;
932 }
933 }
935 result=STATE_OK;
936 if(valid_responses==0)
937 result=STATE_CRITICAL;
938 else if(requested_servers>0 && requested_responses==0)
939 result=STATE_CRITICAL;
940 else if(requested_responses<requested_servers)
941 result=STATE_WARNING;
942 else if(request_specific_address==TRUE && received_requested_address==FALSE)
943 result=STATE_WARNING;
945 if(result==0) /* garrett honeycutt 2005 */
946 printf("OK: ");
947 else if(result==1)
948 printf("WARNING: ");
949 else if(result==2)
950 printf("CRITICAL: ");
951 else if(result==3)
952 printf("UNKNOWN: ");
954 /* we didn't receive any DHCPOFFERs */
955 if(dhcp_offer_list==NULL){
956 printf(_("No DHCPOFFERs were received.\n"));
957 return result;
958 }
960 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
962 if(requested_servers>0)
963 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
965 if(request_specific_address==TRUE)
966 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
968 printf(_(", max lease time = "));
969 if(max_lease_time==DHCP_INFINITE_TIME)
970 printf(_("Infinity"));
971 else
972 printf("%lu sec",(unsigned long)max_lease_time);
974 printf(".\n");
976 return result;
977 }
980 /* process command-line arguments */
981 int process_arguments(int argc, char **argv){
982 int c;
984 if(argc<1)
985 return ERROR;
987 c=0;
988 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
990 /*
991 if(is_option(argv[c]))
992 continue;
993 */
994 }
996 return validate_arguments();
997 }
1001 int call_getopt(int argc, char **argv){
1002 int c=0;
1003 int i=0;
1004 struct in_addr ipaddress;
1006 int option_index = 0;
1007 static struct option long_options[] =
1008 {
1009 {"serverip", required_argument,0,'s'},
1010 {"requestedip", required_argument,0,'r'},
1011 {"timeout", required_argument,0,'t'},
1012 {"interface", required_argument,0,'i'},
1013 {"verbose", no_argument, 0,'v'},
1014 {"version", no_argument, 0,'V'},
1015 {"help", no_argument, 0,'h'},
1016 {0,0,0,0}
1017 };
1019 while(1){
1020 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1022 i++;
1024 if(c==-1||c==EOF||c==1)
1025 break;
1027 switch(c){
1028 case 'w':
1029 case 'r':
1030 case 't':
1031 case 'i':
1032 i++;
1033 break;
1034 default:
1035 break;
1036 }
1038 switch(c){
1040 case 's': /* DHCP server address */
1041 if(inet_aton(optarg,&ipaddress))
1042 add_requested_server(ipaddress);
1043 /*
1044 else
1045 usage("Invalid server IP address\n");
1046 */
1047 break;
1049 case 'r': /* address we are requested from DHCP servers */
1050 if(inet_aton(optarg,&ipaddress)){
1051 requested_address=ipaddress;
1052 request_specific_address=TRUE;
1053 }
1054 /*
1055 else
1056 usage("Invalid requested IP address\n");
1057 */
1058 break;
1060 case 't': /* timeout */
1062 /*
1063 if(is_intnonneg(optarg))
1064 */
1065 if(atoi(optarg)>0)
1066 dhcpoffer_timeout=atoi(optarg);
1067 /*
1068 else
1069 usage("Time interval must be a nonnegative integer\n");
1070 */
1071 break;
1073 case 'i': /* interface name */
1075 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1076 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1078 break;
1080 case 'V': /* version */
1081 print_revision(progname,revision);
1082 exit(STATE_OK);
1084 case 'h': /* help */
1085 print_help();
1086 exit(STATE_OK);
1088 case 'v': /* verbose */
1089 verbose=1;
1090 break;
1092 case '?': /* help */
1093 usage2 (_("Unknown argument"), optarg);
1094 break;
1096 default:
1097 break;
1098 }
1099 }
1101 return i;
1102 }
1105 int validate_arguments(void){
1107 return OK;
1108 }
1111 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1112 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1114 /* get a message from a stream; return type of message */
1115 static int get_msg(int fd){
1116 int flags = 0;
1117 int res, ret;
1118 ctl_area[0] = 0;
1119 dat_area[0] = 0;
1120 ret = 0;
1121 res = getmsg(fd, &ctl, &dat, &flags);
1123 if(res < 0){
1124 if(errno == EINTR){
1125 return(GOT_INTR);
1126 }
1127 else{
1128 printf("%s\n", "get_msg FAILED.");
1129 return(GOT_ERR);
1130 }
1131 }
1132 if(ctl.len > 0){
1133 ret |= GOT_CTRL;
1134 }
1135 if(dat.len > 0){
1136 ret |= GOT_DATA;
1137 }
1139 return(ret);
1140 }
1142 /* verify that dl_primitive in ctl_area = prim */
1143 static int check_ctrl(int prim){
1144 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1146 if(err_ack->dl_primitive != prim){
1147 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1148 exit(STATE_UNKNOWN);
1149 }
1151 return 0;
1152 }
1154 /* put a control message on a stream */
1155 static int put_ctrl(int fd, int len, int pri){
1157 ctl.len = len;
1158 if(putmsg(fd, &ctl, 0, pri) < 0){
1159 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1160 exit(STATE_UNKNOWN);
1161 }
1163 return 0;
1164 }
1166 /* put a control + data message on a stream */
1167 static int put_both(int fd, int clen, int dlen, int pri){
1169 ctl.len = clen;
1170 dat.len = dlen;
1171 if(putmsg(fd, &ctl, &dat, pri) < 0){
1172 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1173 exit(STATE_UNKNOWN);
1174 }
1176 return 0;
1177 }
1179 /* open file descriptor and attach */
1180 static int dl_open(const char *dev, int unit, int *fd){
1181 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1183 if((*fd = open(dev, O_RDWR)) == -1){
1184 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1185 exit(STATE_UNKNOWN);
1186 }
1187 attach_req->dl_primitive = DL_ATTACH_REQ;
1188 attach_req->dl_ppa = unit;
1189 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1190 get_msg(*fd);
1191 return check_ctrl(DL_OK_ACK);
1192 }
1194 /* send DL_BIND_REQ */
1195 static int dl_bind(int fd, int sap, u_char *addr){
1196 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1197 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1199 bind_req->dl_primitive = DL_BIND_REQ;
1200 bind_req->dl_sap = sap;
1201 bind_req->dl_max_conind = 1;
1202 bind_req->dl_service_mode = DL_CLDLS;
1203 bind_req->dl_conn_mgmt = 0;
1204 bind_req->dl_xidtest_flg = 0;
1205 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1206 get_msg(fd);
1207 if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1208 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1209 exit(STATE_UNKNOWN);
1210 }
1211 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1212 bind_ack->dl_addr_length);
1214 return 0;
1215 }
1217 /***********************************************************************
1218 * interface:
1219 * function mac_addr_dlpi - get the mac address of the interface with
1220 * type dev (eg lnc, hme) and unit (0, 1 ..)
1221 *
1222 * parameter: addr: an array of six bytes, has to be allocated by the caller
1223 *
1224 * return: 0 if OK, -1 if the address could not be determined
1225 *
1226 *
1227 ***********************************************************************/
1229 long mac_addr_dlpi( const char *dev, int unit, u_char *addr){
1230 int fd;
1231 u_char mac_addr[25];
1233 if(GOT_ERR != dl_open(dev, unit, &fd)){
1234 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1235 bcopy( mac_addr, addr, 6);
1236 return 0;
1237 }
1238 }
1239 close(fd);
1241 return -1;
1242 }
1244 /* Kompf 2000-2003 */
1245 #endif
1248 /* print usage help */
1249 void print_help(void){
1251 print_revision(progname,revision);
1253 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1254 printf (COPYRIGHT, copyright, email);
1256 printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1258 printf ("\n\n");
1260 print_usage();
1262 printf (_(UT_HELP_VRSN));
1264 printf (_(UT_VERBOSE));
1266 printf (" %s\n", "-s, --serverip=IPADDRESS");
1267 printf (" %s\n", _("IP address of DHCP server that we must hear from"));
1268 printf (" %s\n", "-r, --requestedip=IPADDRESS");
1269 printf (" %s\n", _("IP address that should be offered by at least one DHCP server"));
1270 printf (" %s\n", "-t, --timeout=INTEGER");
1271 printf (" %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1272 printf (" %s\n", "-i, --interface=STRING");
1273 printf (" %s\n", _("Interface to to use for listening (i.e. eth0)"));
1275 return;
1276 }
1279 void
1280 print_usage(void){
1282 printf (_("Usage:"));
1283 printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1285 return;
1286 }