245946b5ebd971c173f82ac2dc502f9ef70ff7d2
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_RENEWAL_TIME 58
186 #define DHCP_OPTION_REBINDING_TIME 59
188 #define DHCP_INFINITE_TIME 0xFFFFFFFF
190 #define DHCP_BROADCAST_FLAG 32768
192 #define DHCP_SERVER_PORT 67
193 #define DHCP_CLIENT_PORT 68
195 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
196 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
198 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
200 char network_interface_name[IFNAMSIZ]="eth0";
202 u_int32_t packet_xid=0;
204 u_int32_t dhcp_lease_time=0;
205 u_int32_t dhcp_renewal_time=0;
206 u_int32_t dhcp_rebinding_time=0;
208 int dhcpoffer_timeout=2;
210 dhcp_offer *dhcp_offer_list=NULL;
211 requested_server *requested_server_list=NULL;
213 int valid_responses=0; /* number of valid DHCPOFFERs we received */
214 int requested_servers=0;
215 int requested_responses=0;
217 int request_specific_address=FALSE;
218 int received_requested_address=FALSE;
219 int verbose=0;
220 struct in_addr requested_address;
223 int process_arguments(int, char **);
224 int call_getopt(int, char **);
225 int validate_arguments(void);
226 void print_usage(void);
227 void print_help(void);
229 int get_hardware_address(int,char *);
231 int send_dhcp_discover(int);
232 int get_dhcp_offer(int);
234 int get_results(void);
236 int add_dhcp_offer(struct in_addr,dhcp_packet *);
237 int free_dhcp_offer_list(void);
238 int free_requested_server_list(void);
240 int create_dhcp_socket(void);
241 int close_dhcp_socket(int);
242 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
243 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
247 int main(int argc, char **argv){
248 int dhcp_socket;
249 int result = STATE_UNKNOWN;
251 setlocale (LC_ALL, "");
252 bindtextdomain (PACKAGE, LOCALEDIR);
253 textdomain (PACKAGE);
255 if(process_arguments(argc,argv)!=OK){
256 usage4 (_("Could not parse arguments"));
257 }
259 /* create socket for DHCP communications */
260 dhcp_socket=create_dhcp_socket();
262 /* get hardware address of client machine */
263 get_hardware_address(dhcp_socket,network_interface_name);
265 /* send DHCPDISCOVER packet */
266 send_dhcp_discover(dhcp_socket);
268 /* wait for a DHCPOFFER packet */
269 get_dhcp_offer(dhcp_socket);
271 /* close socket we created */
272 close_dhcp_socket(dhcp_socket);
274 /* determine state/plugin output to return */
275 result=get_results();
277 /* free allocated memory */
278 free_dhcp_offer_list();
279 free_requested_server_list();
281 return result;
282 }
286 /* determines hardware address on client machine */
287 int get_hardware_address(int sock,char *interface_name){
289 int i;
291 #if defined(__linux__)
292 struct ifreq ifr;
294 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
296 /* try and grab hardware address of requested interface */
297 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
298 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
299 exit(STATE_UNKNOWN);
300 }
302 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
304 #elif defined(__bsd__)
305 /* King 2004 see ACKNOWLEDGEMENTS */
307 int mib[6], len;
308 char *buf;
309 unsigned char *ptr;
310 struct if_msghdr *ifm;
311 struct sockaddr_dl *sdl;
313 mib[0] = CTL_NET;
314 mib[1] = AF_ROUTE;
315 mib[2] = 0;
316 mib[3] = AF_LINK;
317 mib[4] = NET_RT_IFLIST;
319 if((mib[5] = if_nametoindex(interface_name)) == 0){
320 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
321 exit(STATE_UNKNOWN);
322 }
324 if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
325 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
326 exit(STATE_UNKNOWN);
327 }
329 if((buf = malloc(len)) == NULL){
330 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
331 exit(4);
332 }
334 if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
335 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
336 exit(STATE_UNKNOWN);
337 }
339 ifm = (struct if_msghdr *)buf;
340 sdl = (struct sockaddr_dl *)(ifm + 1);
341 ptr = (unsigned char *)LLADDR(sdl);
342 memcpy(&client_hardware_address[0], ptr, 6) ;
343 /* King 2004 */
345 #elif defined(__sun__) || defined(__solaris__)
347 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
348 long stat;
349 char dev[20] = "/dev/";
350 char *p;
351 int unit;
353 for(p = interface_name; *p && isalpha(*p); p++)
354 /* no-op */ ;
355 if( p != '\0' ){
356 unit = atoi(p) ;
357 *p = '\0' ;
358 strncat(dev, interface_name, 6) ;
359 }
360 else{
361 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
362 exit(STATE_UNKNOWN);
363 }
364 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
365 if(stat != 0){
366 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
367 exit(STATE_UNKNOWN);
368 }
370 #elif defined(__hpux__)
372 long stat;
373 char dev[20] = "/dev/dlpi" ;
374 int unit = 0;
376 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
377 if(stat != 0){
378 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
379 exit(STATE_UNKNOWN);
380 }
381 /* Kompf 2000-2003 */
383 #else
384 printf(_("Error: can't get MAC address for this architecture.\n"));
385 exit(STATE_UNKNOWN);
386 #endif
388 if(verbose){
389 printf(_("Hardware address: "));
390 for (i=0; i<6; ++i)
391 printf("%2.2x", client_hardware_address[i]);
392 printf( "\n");
393 }
395 return OK;
396 }
399 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
400 int send_dhcp_discover(int sock){
401 dhcp_packet discover_packet;
402 struct sockaddr_in sockaddr_broadcast;
405 /* clear the packet data structure */
406 bzero(&discover_packet,sizeof(discover_packet));
409 /* boot request flag (backward compatible with BOOTP servers) */
410 discover_packet.op=BOOTREQUEST;
412 /* hardware address type */
413 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
415 /* length of our hardware address */
416 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
418 discover_packet.hops=0;
420 /* transaction id is supposed to be random */
421 srand(time(NULL));
422 packet_xid=random();
423 discover_packet.xid=htonl(packet_xid);
425 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
426 /* downright bizzarre... */
427 ntohl(discover_packet.xid);
429 /*discover_packet.secs=htons(65535);*/
430 discover_packet.secs=0xFF;
432 /* tell server it should broadcast its response */
433 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
435 /* our hardware address */
436 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
438 /* first four bytes of options field is magic cookie (as per RFC 2132) */
439 discover_packet.options[0]='\x63';
440 discover_packet.options[1]='\x82';
441 discover_packet.options[2]='\x53';
442 discover_packet.options[3]='\x63';
444 /* DHCP message type is embedded in options field */
445 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
446 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
447 discover_packet.options[6]=DHCPDISCOVER;
449 /* the IP address we're requesting */
450 if(request_specific_address==TRUE){
451 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
452 discover_packet.options[8]='\x04';
453 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
454 }
456 /* send the DHCPDISCOVER packet to broadcast address */
457 sockaddr_broadcast.sin_family=AF_INET;
458 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
459 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
460 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
463 if(verbose){
464 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
465 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
466 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
467 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
468 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
469 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
470 }
472 /* send the DHCPDISCOVER packet out */
473 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
475 if(verbose)
476 printf("\n\n");
478 return OK;
479 }
484 /* waits for a DHCPOFFER message from one or more DHCP servers */
485 int get_dhcp_offer(int sock){
486 dhcp_packet offer_packet;
487 struct sockaddr_in source;
488 struct sockaddr_in via;
489 int result=OK;
490 int timeout=1;
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 struct sockaddr_in myname;
598 int result;
600 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
602 if(verbose)
603 printf(_("send_dhcp_packet result: %d\n"),result);
605 if(result<0)
606 return ERROR;
608 return OK;
609 }
613 /* receives a DHCP packet */
614 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
615 struct timeval tv;
616 fd_set readfds;
617 int recv_result;
618 socklen_t address_size;
619 struct sockaddr_in source_address;
622 /* wait for data to arrive (up time timeout) */
623 tv.tv_sec=timeout;
624 tv.tv_usec=0;
625 FD_ZERO(&readfds);
626 FD_SET(sock,&readfds);
627 select(sock+1,&readfds,NULL,NULL,&tv);
629 /* make sure some data has arrived */
630 if(!FD_ISSET(sock,&readfds)){
631 if(verbose)
632 printf(_("No (more) data received\n"));
633 return ERROR;
634 }
636 else{
638 /* 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
639 not being interpreted correctly. sigh... */
640 bzero(&source_address,sizeof(source_address));
641 address_size=sizeof(source_address);
642 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
643 if(verbose)
644 printf("recv_result_1: %d\n",recv_result);
645 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
646 if(verbose)
647 printf("recv_result_2: %d\n",recv_result);
649 if(recv_result==-1){
650 if(verbose){
651 printf(_("recvfrom() failed, "));
652 printf("errno: (%d) -> %s\n",errno,strerror(errno));
653 }
654 return ERROR;
655 }
656 else{
657 if(verbose){
658 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
659 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
660 }
662 memcpy(address,&source_address,sizeof(source_address));
663 return OK;
664 }
665 }
667 return OK;
668 }
671 /* creates a socket for DHCP communication */
672 int create_dhcp_socket(void){
673 struct sockaddr_in myname;
674 struct ifreq interface;
675 int sock;
676 int flag=1;
678 /* Set up the address we're going to bind to. */
679 bzero(&myname,sizeof(myname));
680 myname.sin_family=AF_INET;
681 myname.sin_port=htons(DHCP_CLIENT_PORT);
682 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
683 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
685 /* create a socket for DHCP communications */
686 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
687 if(sock<0){
688 printf(_("Error: Could not create socket!\n"));
689 exit(STATE_UNKNOWN);
690 }
692 if(verbose)
693 printf("DHCP socket: %d\n",sock);
695 /* set the reuse address flag so we don't get errors when restarting */
696 flag=1;
697 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
698 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
699 exit(STATE_UNKNOWN);
700 }
702 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
703 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
704 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
705 exit(STATE_UNKNOWN);
706 }
708 /* bind socket to interface */
709 #if defined(__linux__)
710 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
711 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
712 printf(_("Error: Could not bind socket to interface %s. Check your privileges...\n"),network_interface_name);
713 exit(STATE_UNKNOWN);
714 }
716 #else
717 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
718 #endif
720 /* bind the socket */
721 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
722 printf(_("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n"),DHCP_CLIENT_PORT);
723 exit(STATE_UNKNOWN);
724 }
726 return sock;
727 }
730 /* closes DHCP socket */
731 int close_dhcp_socket(int sock){
733 close(sock);
735 return OK;
736 }
739 /* adds a requested server address to list in memory */
740 int add_requested_server(struct in_addr server_address){
741 requested_server *new_server;
743 new_server=(requested_server *)malloc(sizeof(requested_server));
744 if(new_server==NULL)
745 return ERROR;
747 new_server->server_address=server_address;
748 new_server->answered=FALSE;
750 new_server->next=requested_server_list;
751 requested_server_list=new_server;
753 requested_servers++;
755 if(verbose)
756 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
758 return OK;
759 }
764 /* adds a DHCP OFFER to list in memory */
765 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
766 dhcp_offer *new_offer;
767 int x;
768 int y;
769 unsigned option_type;
770 unsigned option_length;
772 if(offer_packet==NULL)
773 return ERROR;
775 /* process all DHCP options present in the packet */
776 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
778 /* end of options (0 is really just a pad, but bail out anyway) */
779 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
780 break;
782 /* get option type */
783 option_type=offer_packet->options[x++];
785 /* get option length */
786 option_length=offer_packet->options[x++];
788 if(verbose)
789 printf("Option: %d (0x%02X)\n",option_type,option_length);
791 /* get option data */
792 if(option_type==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 }
796 if(option_type==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 }
800 if(option_type==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 }
805 /* skip option data we're ignoring */
806 else
807 for(y=0;y<option_length;y++,x++);
808 }
810 if(verbose){
811 if(dhcp_lease_time==DHCP_INFINITE_TIME)
812 printf(_("Lease Time: Infinite\n"));
813 else
814 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
815 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
816 printf(_("Renewal Time: Infinite\n"));
817 else
818 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
819 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
820 printf(_("Rebinding Time: Infinite\n"));
821 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
822 }
824 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
826 if(new_offer==NULL)
827 return ERROR;
829 new_offer->server_address=source;
830 new_offer->offered_address=offer_packet->yiaddr;
831 new_offer->lease_time=dhcp_lease_time;
832 new_offer->renewal_time=dhcp_renewal_time;
833 new_offer->rebinding_time=dhcp_rebinding_time;
836 if(verbose){
837 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
838 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
839 }
841 /* add new offer to head of list */
842 new_offer->next=dhcp_offer_list;
843 dhcp_offer_list=new_offer;
845 return OK;
846 }
849 /* frees memory allocated to DHCP OFFER list */
850 int free_dhcp_offer_list(void){
851 dhcp_offer *this_offer;
852 dhcp_offer *next_offer;
854 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
855 next_offer=this_offer->next;
856 free(this_offer);
857 }
859 return OK;
860 }
863 /* frees memory allocated to requested server list */
864 int free_requested_server_list(void){
865 requested_server *this_server;
866 requested_server *next_server;
868 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
869 next_server=this_server->next;
870 free(this_server);
871 }
873 return OK;
874 }
877 /* gets state and plugin output to return */
878 int get_results(void){
879 dhcp_offer *temp_offer;
880 requested_server *temp_server;
881 int result;
882 u_int32_t max_lease_time=0;
884 received_requested_address=FALSE;
886 /* checks responses from requested servers */
887 requested_responses=0;
888 if(requested_servers>0){
890 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
892 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
894 /* get max lease time we were offered */
895 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
896 max_lease_time=temp_offer->lease_time;
898 /* see if we got the address we requested */
899 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
900 received_requested_address=TRUE;
902 /* see if the servers we wanted a response from talked to us or not */
903 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
904 if(verbose){
905 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
906 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
907 if(temp_server->answered)
908 printf(_(" (duplicate)"));
909 printf(_("\n"));
910 }
911 if(temp_server->answered == FALSE){
912 requested_responses++;
913 temp_server->answered=TRUE;
914 }
915 }
916 }
917 }
919 }
921 /* else check and see if we got our requested address from any server */
922 else{
924 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
926 /* get max lease time we were offered */
927 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
928 max_lease_time=temp_offer->lease_time;
930 /* see if we got the address we requested */
931 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
932 received_requested_address=TRUE;
933 }
934 }
936 result=STATE_OK;
937 if(valid_responses==0)
938 result=STATE_CRITICAL;
939 else if(requested_servers>0 && requested_responses==0)
940 result=STATE_CRITICAL;
941 else if(requested_responses<requested_servers)
942 result=STATE_WARNING;
943 else if(request_specific_address==TRUE && received_requested_address==FALSE)
944 result=STATE_WARNING;
946 if(result==0) /* garrett honeycutt 2005 */
947 printf("OK: ");
948 else if(result==1)
949 printf("WARNING: ");
950 else if(result==2)
951 printf("CRITICAL: ");
952 else if(result==3)
953 printf("UNKNOWN: ");
955 /* we didn't receive any DHCPOFFERs */
956 if(dhcp_offer_list==NULL){
957 printf(_("No DHCPOFFERs were received.\n"));
958 return result;
959 }
961 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
963 if(requested_servers>0)
964 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
966 if(request_specific_address==TRUE)
967 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
969 printf(_(", max lease time = "));
970 if(max_lease_time==DHCP_INFINITE_TIME)
971 printf(_("Infinity"));
972 else
973 printf("%lu sec",(unsigned long)max_lease_time);
975 printf(".\n");
977 return result;
978 }
981 /* process command-line arguments */
982 int process_arguments(int argc, char **argv){
983 int c;
985 if(argc<1)
986 return ERROR;
988 c=0;
989 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
991 /*
992 if(is_option(argv[c]))
993 continue;
994 */
995 }
997 return validate_arguments();
998 }
1002 int call_getopt(int argc, char **argv){
1003 int c=0;
1004 int i=0;
1005 struct in_addr ipaddress;
1007 int option_index = 0;
1008 static struct option long_options[] =
1009 {
1010 {"serverip", required_argument,0,'s'},
1011 {"requestedip", required_argument,0,'r'},
1012 {"timeout", required_argument,0,'t'},
1013 {"interface", required_argument,0,'i'},
1014 {"verbose", no_argument, 0,'v'},
1015 {"version", no_argument, 0,'V'},
1016 {"help", no_argument, 0,'h'},
1017 {0,0,0,0}
1018 };
1020 while(1){
1021 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1023 i++;
1025 if(c==-1||c==EOF||c==1)
1026 break;
1028 switch(c){
1029 case 'w':
1030 case 'r':
1031 case 't':
1032 case 'i':
1033 i++;
1034 break;
1035 default:
1036 break;
1037 }
1039 switch(c){
1041 case 's': /* DHCP server address */
1042 if(inet_aton(optarg,&ipaddress))
1043 add_requested_server(ipaddress);
1044 /*
1045 else
1046 usage("Invalid server IP address\n");
1047 */
1048 break;
1050 case 'r': /* address we are requested from DHCP servers */
1051 if(inet_aton(optarg,&ipaddress)){
1052 requested_address=ipaddress;
1053 request_specific_address=TRUE;
1054 }
1055 /*
1056 else
1057 usage("Invalid requested IP address\n");
1058 */
1059 break;
1061 case 't': /* timeout */
1063 /*
1064 if(is_intnonneg(optarg))
1065 */
1066 if(atoi(optarg)>0)
1067 dhcpoffer_timeout=atoi(optarg);
1068 /*
1069 else
1070 usage("Time interval must be a nonnegative integer\n");
1071 */
1072 break;
1074 case 'i': /* interface name */
1076 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1077 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1079 break;
1081 case 'V': /* version */
1082 print_revision(progname,revision);
1083 exit(STATE_OK);
1085 case 'h': /* help */
1086 print_help();
1087 exit(STATE_OK);
1089 case 'v': /* verbose */
1090 verbose=1;
1091 break;
1093 case '?': /* help */
1094 usage5 ();
1095 break;
1097 default:
1098 break;
1099 }
1100 }
1102 return i;
1103 }
1106 int validate_arguments(void){
1108 return OK;
1109 }
1112 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1113 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1115 /* get a message from a stream; return type of message */
1116 static int get_msg(int fd){
1117 int flags = 0;
1118 int res, ret;
1119 ctl_area[0] = 0;
1120 dat_area[0] = 0;
1121 ret = 0;
1122 res = getmsg(fd, &ctl, &dat, &flags);
1124 if(res < 0){
1125 if(errno == EINTR){
1126 return(GOT_INTR);
1127 }
1128 else{
1129 printf("%s\n", "get_msg FAILED.");
1130 return(GOT_ERR);
1131 }
1132 }
1133 if(ctl.len > 0){
1134 ret |= GOT_CTRL;
1135 }
1136 if(dat.len > 0){
1137 ret |= GOT_DATA;
1138 }
1140 return(ret);
1141 }
1143 /* verify that dl_primitive in ctl_area = prim */
1144 static int check_ctrl(int prim){
1145 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1147 if(err_ack->dl_primitive != prim){
1148 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1149 exit(STATE_UNKNOWN);
1150 }
1152 return 0;
1153 }
1155 /* put a control message on a stream */
1156 static int put_ctrl(int fd, int len, int pri){
1158 ctl.len = len;
1159 if(putmsg(fd, &ctl, 0, pri) < 0){
1160 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1161 exit(STATE_UNKNOWN);
1162 }
1164 return 0;
1165 }
1167 /* put a control + data message on a stream */
1168 static int put_both(int fd, int clen, int dlen, int pri){
1170 ctl.len = clen;
1171 dat.len = dlen;
1172 if(putmsg(fd, &ctl, &dat, pri) < 0){
1173 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1174 exit(STATE_UNKNOWN);
1175 }
1177 return 0;
1178 }
1180 /* open file descriptor and attach */
1181 static int dl_open(const char *dev, int unit, int *fd){
1182 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1184 if((*fd = open(dev, O_RDWR)) == -1){
1185 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1186 exit(STATE_UNKNOWN);
1187 }
1188 attach_req->dl_primitive = DL_ATTACH_REQ;
1189 attach_req->dl_ppa = unit;
1190 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1191 get_msg(*fd);
1192 return check_ctrl(DL_OK_ACK);
1193 }
1195 /* send DL_BIND_REQ */
1196 static int dl_bind(int fd, int sap, u_char *addr){
1197 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1198 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1200 bind_req->dl_primitive = DL_BIND_REQ;
1201 bind_req->dl_sap = sap;
1202 bind_req->dl_max_conind = 1;
1203 bind_req->dl_service_mode = DL_CLDLS;
1204 bind_req->dl_conn_mgmt = 0;
1205 bind_req->dl_xidtest_flg = 0;
1206 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1207 get_msg(fd);
1208 if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1209 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1210 exit(STATE_UNKNOWN);
1211 }
1212 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1213 bind_ack->dl_addr_length);
1215 return 0;
1216 }
1218 /***********************************************************************
1219 * interface:
1220 * function mac_addr_dlpi - get the mac address of the interface with
1221 * type dev (eg lnc, hme) and unit (0, 1 ..)
1222 *
1223 * parameter: addr: an array of six bytes, has to be allocated by the caller
1224 *
1225 * return: 0 if OK, -1 if the address could not be determined
1226 *
1227 *
1228 ***********************************************************************/
1230 long mac_addr_dlpi( const char *dev, int unit, u_char *addr){
1231 int fd;
1232 u_char mac_addr[25];
1234 if(GOT_ERR != dl_open(dev, unit, &fd)){
1235 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1236 bcopy( mac_addr, addr, 6);
1237 return 0;
1238 }
1239 }
1240 close(fd);
1242 return -1;
1243 }
1245 /* Kompf 2000-2003 */
1246 #endif
1249 /* print usage help */
1250 void print_help(void){
1252 print_revision(progname,revision);
1254 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1255 printf (COPYRIGHT, copyright, email);
1257 printf("%s\n", _("This plugin tests the availability of DHCP servers on a network."));
1259 printf ("\n\n");
1261 print_usage();
1263 printf (_(UT_HELP_VRSN));
1265 printf (_(UT_VERBOSE));
1267 printf (" %s\n", "-s, --serverip=IPADDRESS");
1268 printf (" %s\n", _("IP address of DHCP server that we must hear from"));
1269 printf (" %s\n", "-r, --requestedip=IPADDRESS");
1270 printf (" %s\n", _("IP address that should be offered by at least one DHCP server"));
1271 printf (" %s\n", "-t, --timeout=INTEGER");
1272 printf (" %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
1273 printf (" %s\n", "-i, --interface=STRING");
1274 printf (" %s\n", _("Interface to to use for listening (i.e. eth0)"));
1276 return;
1277 }
1280 void
1281 print_usage(void){
1283 printf (_("Usage:"));
1284 printf ("%s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1286 return;
1287 }