1 /******************************************************************************
2 *
3 * CHECK_DHCP.C
4 *
5 * Program: DHCP plugin for Nagios
6 * License: GPL
7 * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
8 * Copyright (c) 2001-2006 Nagios Plugin Development Team
9 *
10 * License Information:
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * $Id$
27 *
28 *****************************************************************************/
30 const char *progname = "check_dhcp";
31 const char *revision = "$Revision$";
32 const char *copyright = "2001-2006";
33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
35 #include "common.h"
36 #include "netutils.h"
37 #include "utils.h"
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <errno.h>
43 #include <unistd.h>
44 #include <sys/time.h>
45 #include <sys/ioctl.h>
46 #include <fcntl.h>
47 #include <getopt.h>
48 #include <sys/socket.h>
49 #include <sys/types.h>
50 #include <netdb.h>
51 #include <netinet/in.h>
52 #include <net/if.h>
53 #include <arpa/inet.h>
55 #if defined( __linux__ )
57 #include <linux/if_ether.h>
58 #include <features.h>
60 #elif defined (__bsd__)
62 #include <netinet/if_ether.h>
63 #include <sys/sysctl.h>
64 #include <net/if_dl.h>
66 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
68 #define INSAP 22
69 #define OUTSAP 24
71 #include <signal.h>
72 #include <ctype.h>
73 #include <sys/stropts.h>
74 #include <sys/poll.h>
75 #include <sys/dlpi.h>
77 #define bcopy(source, destination, length) memcpy(destination, source, length)
79 #define AREA_SZ 5000 /* buffer length in bytes */
80 static u_long ctl_area[AREA_SZ];
81 static u_long dat_area[AREA_SZ];
82 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
83 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
85 #define GOT_CTRL 1
86 #define GOT_DATA 2
87 #define GOT_BOTH 3
88 #define GOT_INTR 4
89 #define GOT_ERR 128
91 #define u_int8_t uint8_t
92 #define u_int16_t uint16_t
93 #define u_int32_t uint32_t
95 static int get_msg(int);
96 static int check_ctrl(int);
97 static int put_ctrl(int, int, int);
98 static int put_both(int, int, int, int);
99 static int dl_open(const char *, int, int *);
100 static int dl_bind(int, int, u_char *);
101 long mac_addr_dlpi( const char *, int, u_char *);
103 #endif
107 /**** Common definitions ****/
109 #define OK 0
110 #define ERROR -1
112 #define FALSE 0
113 #define TRUE 1
116 /**** DHCP definitions ****/
118 #define MAX_DHCP_CHADDR_LENGTH 16
119 #define MAX_DHCP_SNAME_LENGTH 64
120 #define MAX_DHCP_FILE_LENGTH 128
121 #define MAX_DHCP_OPTIONS_LENGTH 312
124 typedef struct dhcp_packet_struct{
125 u_int8_t op; /* packet type */
126 u_int8_t htype; /* type of hardware address for this machine (Ethernet, etc) */
127 u_int8_t hlen; /* length of hardware address (of this machine) */
128 u_int8_t hops; /* hops */
129 u_int32_t xid; /* random transaction id number - chosen by this machine */
130 u_int16_t secs; /* seconds used in timing */
131 u_int16_t flags; /* flags */
132 struct in_addr ciaddr; /* IP address of this machine (if we already have one) */
133 struct in_addr yiaddr; /* IP address of this machine (offered by the DHCP server) */
134 struct in_addr siaddr; /* IP address of DHCP server */
135 struct in_addr giaddr; /* IP address of DHCP relay */
136 unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH]; /* hardware address of this machine */
137 char sname [MAX_DHCP_SNAME_LENGTH]; /* name of DHCP server */
138 char file [MAX_DHCP_FILE_LENGTH]; /* boot file name (used for diskless booting?) */
139 char options[MAX_DHCP_OPTIONS_LENGTH]; /* options */
140 }dhcp_packet;
143 typedef struct dhcp_offer_struct{
144 struct in_addr server_address; /* address of DHCP server that sent this offer */
145 struct in_addr offered_address; /* the IP address that was offered to us */
146 u_int32_t lease_time; /* lease time in seconds */
147 u_int32_t renewal_time; /* renewal time in seconds */
148 u_int32_t rebinding_time; /* rebinding time in seconds */
149 struct dhcp_offer_struct *next;
150 }dhcp_offer;
153 typedef struct requested_server_struct{
154 struct in_addr server_address;
155 int answered;
156 struct requested_server_struct *next;
157 }requested_server;
160 #define BOOTREQUEST 1
161 #define BOOTREPLY 2
163 #define DHCPDISCOVER 1
164 #define DHCPOFFER 2
165 #define DHCPREQUEST 3
166 #define DHCPDECLINE 4
167 #define DHCPACK 5
168 #define DHCPNACK 6
169 #define DHCPRELEASE 7
171 #define DHCP_OPTION_MESSAGE_TYPE 53
172 #define DHCP_OPTION_HOST_NAME 12
173 #define DHCP_OPTION_BROADCAST_ADDRESS 28
174 #define DHCP_OPTION_REQUESTED_ADDRESS 50
175 #define DHCP_OPTION_LEASE_TIME 51
176 #define DHCP_OPTION_RENEWAL_TIME 58
177 #define DHCP_OPTION_REBINDING_TIME 59
179 #define DHCP_INFINITE_TIME 0xFFFFFFFF
181 #define DHCP_BROADCAST_FLAG 32768
183 #define DHCP_SERVER_PORT 67
184 #define DHCP_CLIENT_PORT 68
186 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
187 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
189 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
191 char network_interface_name[IFNAMSIZ]="eth0";
193 u_int32_t packet_xid=0;
195 u_int32_t dhcp_lease_time=0;
196 u_int32_t dhcp_renewal_time=0;
197 u_int32_t dhcp_rebinding_time=0;
199 int dhcpoffer_timeout=2;
201 dhcp_offer *dhcp_offer_list=NULL;
202 requested_server *requested_server_list=NULL;
204 int valid_responses=0; /* number of valid DHCPOFFERs we received */
205 int requested_servers=0;
206 int requested_responses=0;
208 int request_specific_address=FALSE;
209 int received_requested_address=FALSE;
210 int verbose=0;
211 struct in_addr requested_address;
214 int process_arguments(int, char **);
215 int call_getopt(int, char **);
216 int validate_arguments(void);
217 void print_usage(void);
218 void print_help(void);
220 int get_hardware_address(int,char *);
222 int send_dhcp_discover(int);
223 int get_dhcp_offer(int);
225 int get_results(void);
227 int add_dhcp_offer(struct in_addr,dhcp_packet *);
228 int free_dhcp_offer_list(void);
229 int free_requested_server_list(void);
231 int create_dhcp_socket(void);
232 int close_dhcp_socket(int);
233 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
234 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
238 int main(int argc, char **argv){
239 int dhcp_socket;
240 int result = STATE_UNKNOWN;
242 setlocale (LC_ALL, "");
243 bindtextdomain (PACKAGE, LOCALEDIR);
244 textdomain (PACKAGE);
246 if(process_arguments(argc,argv)!=OK){
247 usage4 (_("Could not parse arguments"));
248 }
250 /* create socket for DHCP communications */
251 dhcp_socket=create_dhcp_socket();
253 /* get hardware address of client machine */
254 get_hardware_address(dhcp_socket,network_interface_name);
256 /* send DHCPDISCOVER packet */
257 send_dhcp_discover(dhcp_socket);
259 /* wait for a DHCPOFFER packet */
260 get_dhcp_offer(dhcp_socket);
262 /* close socket we created */
263 close_dhcp_socket(dhcp_socket);
265 /* determine state/plugin output to return */
266 result=get_results();
268 /* free allocated memory */
269 free_dhcp_offer_list();
270 free_requested_server_list();
272 return result;
273 }
277 /* determines hardware address on client machine */
278 int get_hardware_address(int sock,char *interface_name){
280 int i;
282 #if defined(__linux__)
283 struct ifreq ifr;
285 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
287 /* try and grab hardware address of requested interface */
288 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
289 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
290 exit(STATE_UNKNOWN);
291 }
293 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
295 #elif defined(__bsd__)
296 /* King 2004 see ACKNOWLEDGEMENTS */
298 int mib[6], len;
299 char *buf;
300 unsigned char *ptr;
301 struct if_msghdr *ifm;
302 struct sockaddr_dl *sdl;
304 mib[0] = CTL_NET;
305 mib[1] = AF_ROUTE;
306 mib[2] = 0;
307 mib[3] = AF_LINK;
308 mib[4] = NET_RT_IFLIST;
310 if((mib[5] = if_nametoindex(interface_name)) == 0){
311 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
312 exit(STATE_UNKNOWN);
313 }
315 if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0){
316 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
317 exit(STATE_UNKNOWN);
318 }
320 if((buf = malloc(len)) == NULL){
321 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
322 exit(4);
323 }
325 if(sysctl(mib, 6, buf, &len, NULL, 0) < 0){
326 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
327 exit(STATE_UNKNOWN);
328 }
330 ifm = (struct if_msghdr *)buf;
331 sdl = (struct sockaddr_dl *)(ifm + 1);
332 ptr = (unsigned char *)LLADDR(sdl);
333 memcpy(&client_hardware_address[0], ptr, 6) ;
334 /* King 2004 */
336 #elif defined(__sun__) || defined(__solaris__)
338 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
339 long stat;
340 char dev[20] = "/dev/";
341 char *p;
342 int unit;
344 for(p = interface_name; *p && isalpha(*p); p++)
345 /* no-op */ ;
346 if( p != '\0' ){
347 unit = atoi(p) ;
348 *p = '\0' ;
349 strncat(dev, interface_name, 6) ;
350 }
351 else{
352 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
353 exit(STATE_UNKNOWN);
354 }
355 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
356 if(stat != 0){
357 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
358 exit(STATE_UNKNOWN);
359 }
361 #elif defined(__hpux__)
363 long stat;
364 char dev[20] = "/dev/dlpi" ;
365 int unit = 0;
367 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
368 if(stat != 0){
369 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
370 exit(STATE_UNKNOWN);
371 }
372 /* Kompf 2000-2003 */
374 #else
375 printf(_("Error: can't get MAC address for this architecture.\n"));
376 exit(STATE_UNKNOWN);
377 #endif
379 if(verbose){
380 printf(_("Hardware address: "));
381 for (i=0; i<6; ++i)
382 printf("%2.2x", client_hardware_address[i]);
383 printf( "\n");
384 }
386 return OK;
387 }
390 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
391 int send_dhcp_discover(int sock){
392 dhcp_packet discover_packet;
393 struct sockaddr_in sockaddr_broadcast;
396 /* clear the packet data structure */
397 bzero(&discover_packet,sizeof(discover_packet));
400 /* boot request flag (backward compatible with BOOTP servers) */
401 discover_packet.op=BOOTREQUEST;
403 /* hardware address type */
404 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
406 /* length of our hardware address */
407 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
409 discover_packet.hops=0;
411 /* transaction id is supposed to be random */
412 srand(time(NULL));
413 packet_xid=random();
414 discover_packet.xid=htonl(packet_xid);
416 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
417 /* downright bizzarre... */
418 ntohl(discover_packet.xid);
420 /*discover_packet.secs=htons(65535);*/
421 discover_packet.secs=0xFF;
423 /* tell server it should broadcast its response */
424 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
426 /* our hardware address */
427 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
429 /* first four bytes of options field is magic cookie (as per RFC 2132) */
430 discover_packet.options[0]='\x63';
431 discover_packet.options[1]='\x82';
432 discover_packet.options[2]='\x53';
433 discover_packet.options[3]='\x63';
435 /* DHCP message type is embedded in options field */
436 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
437 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
438 discover_packet.options[6]=DHCPDISCOVER;
440 /* the IP address we're requesting */
441 if(request_specific_address==TRUE){
442 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
443 discover_packet.options[8]='\x04';
444 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
445 }
447 /* send the DHCPDISCOVER packet to broadcast address */
448 sockaddr_broadcast.sin_family=AF_INET;
449 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
450 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
451 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
454 if(verbose){
455 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
456 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
457 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
458 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
459 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
460 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
461 }
463 /* send the DHCPDISCOVER packet out */
464 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
466 if(verbose)
467 printf("\n\n");
469 return OK;
470 }
475 /* waits for a DHCPOFFER message from one or more DHCP servers */
476 int get_dhcp_offer(int sock){
477 dhcp_packet offer_packet;
478 struct sockaddr_in source;
479 struct sockaddr_in via;
480 int result=OK;
481 int timeout=1;
482 int responses=0;
483 int x;
484 time_t start_time;
485 time_t current_time;
487 time(&start_time);
489 /* receive as many responses as we can */
490 for(responses=0,valid_responses=0;;){
492 time(¤t_time);
493 if((current_time-start_time)>=dhcpoffer_timeout)
494 break;
496 if(verbose)
497 printf("\n\n");
499 bzero(&source,sizeof(source));
500 bzero(&via,sizeof(via));
501 bzero(&offer_packet,sizeof(offer_packet));
503 result=OK;
504 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
506 if(result!=OK){
507 if(verbose)
508 printf(_("Result=ERROR\n"));
510 continue;
511 }
512 else{
513 if(verbose)
514 printf(_("Result=OK\n"));
516 responses++;
517 }
519 /* The "source" is either a server or a relay. */
520 /* Save a copy of "source" into "via" even if it's via itself */
521 memcpy(&via,&source,sizeof(source)) ;
523 /* If siaddr is non-zero, set "source" to siaddr */
524 if(offer_packet.siaddr.s_addr != 0L){
525 source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
526 }
528 if(verbose){
529 printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
530 printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
531 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
532 }
534 /* check packet xid to see if its the same as the one we used in the discover packet */
535 if(ntohl(offer_packet.xid)!=packet_xid){
536 if(verbose)
537 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
539 continue;
540 }
542 /* check hardware address */
543 result=OK;
544 if(verbose)
545 printf("DHCPOFFER chaddr: ");
547 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
548 if(verbose)
549 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
551 if(offer_packet.chaddr[x]!=client_hardware_address[x])
552 result=ERROR;
553 }
554 if(verbose)
555 printf("\n");
557 if(result==ERROR){
558 if(verbose)
559 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
561 continue;
562 }
564 if(verbose){
565 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
566 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
567 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
568 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
569 }
571 add_dhcp_offer(source.sin_addr,&offer_packet);
573 valid_responses++;
574 }
576 if(verbose){
577 printf(_("Total responses seen on the wire: %d\n"),responses);
578 printf(_("Valid responses for this machine: %d\n"),valid_responses);
579 }
581 return OK;
582 }
586 /* sends a DHCP packet */
587 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
588 struct sockaddr_in myname;
589 int result;
591 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
593 if(verbose)
594 printf(_("send_dhcp_packet result: %d\n"),result);
596 if(result<0)
597 return ERROR;
599 return OK;
600 }
604 /* receives a DHCP packet */
605 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
606 struct timeval tv;
607 fd_set readfds;
608 int recv_result;
609 socklen_t address_size;
610 struct sockaddr_in source_address;
613 /* wait for data to arrive (up time timeout) */
614 tv.tv_sec=timeout;
615 tv.tv_usec=0;
616 FD_ZERO(&readfds);
617 FD_SET(sock,&readfds);
618 select(sock+1,&readfds,NULL,NULL,&tv);
620 /* make sure some data has arrived */
621 if(!FD_ISSET(sock,&readfds)){
622 if(verbose)
623 printf(_("No (more) data received\n"));
624 return ERROR;
625 }
627 else{
629 /* 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
630 not being interpreted correctly. sigh... */
631 bzero(&source_address,sizeof(source_address));
632 address_size=sizeof(source_address);
633 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
634 if(verbose)
635 printf("recv_result_1: %d\n",recv_result);
636 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
637 if(verbose)
638 printf("recv_result_2: %d\n",recv_result);
640 if(recv_result==-1){
641 if(verbose){
642 printf(_("recvfrom() failed, "));
643 printf("errno: (%d) -> %s\n",errno,strerror(errno));
644 }
645 return ERROR;
646 }
647 else{
648 if(verbose){
649 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
650 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
651 }
653 memcpy(address,&source_address,sizeof(source_address));
654 return OK;
655 }
656 }
658 return OK;
659 }
662 /* creates a socket for DHCP communication */
663 int create_dhcp_socket(void){
664 struct sockaddr_in myname;
665 struct ifreq interface;
666 int sock;
667 int flag=1;
669 /* Set up the address we're going to bind to. */
670 bzero(&myname,sizeof(myname));
671 myname.sin_family=AF_INET;
672 myname.sin_port=htons(DHCP_CLIENT_PORT);
673 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
674 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
676 /* create a socket for DHCP communications */
677 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
678 if(sock<0){
679 printf(_("Error: Could not create socket!\n"));
680 exit(STATE_UNKNOWN);
681 }
683 if(verbose)
684 printf("DHCP socket: %d\n",sock);
686 /* set the reuse address flag so we don't get errors when restarting */
687 flag=1;
688 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
689 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
690 exit(STATE_UNKNOWN);
691 }
693 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
694 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
695 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
696 exit(STATE_UNKNOWN);
697 }
699 /* bind socket to interface */
700 #if defined(__linux__)
701 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
702 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
703 printf(_("Error: Could not bind socket to interface %s. Check your privileges...\n"),network_interface_name);
704 exit(STATE_UNKNOWN);
705 }
707 #else
708 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
709 #endif
711 /* bind the socket */
712 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
713 printf(_("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n"),DHCP_CLIENT_PORT);
714 exit(STATE_UNKNOWN);
715 }
717 return sock;
718 }
721 /* closes DHCP socket */
722 int close_dhcp_socket(int sock){
724 close(sock);
726 return OK;
727 }
730 /* adds a requested server address to list in memory */
731 int add_requested_server(struct in_addr server_address){
732 requested_server *new_server;
734 new_server=(requested_server *)malloc(sizeof(requested_server));
735 if(new_server==NULL)
736 return ERROR;
738 new_server->server_address=server_address;
739 new_server->answered=FALSE;
741 new_server->next=requested_server_list;
742 requested_server_list=new_server;
744 requested_servers++;
746 if(verbose)
747 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
749 return OK;
750 }
755 /* adds a DHCP OFFER to list in memory */
756 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
757 dhcp_offer *new_offer;
758 int x;
759 int y;
760 unsigned option_type;
761 unsigned option_length;
763 if(offer_packet==NULL)
764 return ERROR;
766 /* process all DHCP options present in the packet */
767 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
769 /* end of options (0 is really just a pad, but bail out anyway) */
770 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
771 break;
773 /* get option type */
774 option_type=offer_packet->options[x++];
776 /* get option length */
777 option_length=offer_packet->options[x++];
779 if(verbose)
780 printf("Option: %d (0x%02X)\n",option_type,option_length);
782 /* get option data */
783 if(option_type==DHCP_OPTION_LEASE_TIME){
784 memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time));
785 dhcp_lease_time = ntohl(dhcp_lease_time);
786 }
787 if(option_type==DHCP_OPTION_RENEWAL_TIME){
788 memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time));
789 dhcp_renewal_time = ntohl(dhcp_renewal_time);
790 }
791 if(option_type==DHCP_OPTION_REBINDING_TIME){
792 memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time));
793 dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
794 }
796 /* skip option data we're ignoring */
797 else
798 for(y=0;y<option_length;y++,x++);
799 }
801 if(verbose){
802 if(dhcp_lease_time==DHCP_INFINITE_TIME)
803 printf(_("Lease Time: Infinite\n"));
804 else
805 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
806 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
807 printf(_("Renewal Time: Infinite\n"));
808 else
809 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
810 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
811 printf(_("Rebinding Time: Infinite\n"));
812 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
813 }
815 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
817 if(new_offer==NULL)
818 return ERROR;
820 new_offer->server_address=source;
821 new_offer->offered_address=offer_packet->yiaddr;
822 new_offer->lease_time=dhcp_lease_time;
823 new_offer->renewal_time=dhcp_renewal_time;
824 new_offer->rebinding_time=dhcp_rebinding_time;
827 if(verbose){
828 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
829 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
830 }
832 /* add new offer to head of list */
833 new_offer->next=dhcp_offer_list;
834 dhcp_offer_list=new_offer;
836 return OK;
837 }
840 /* frees memory allocated to DHCP OFFER list */
841 int free_dhcp_offer_list(void){
842 dhcp_offer *this_offer;
843 dhcp_offer *next_offer;
845 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
846 next_offer=this_offer->next;
847 free(this_offer);
848 }
850 return OK;
851 }
854 /* frees memory allocated to requested server list */
855 int free_requested_server_list(void){
856 requested_server *this_server;
857 requested_server *next_server;
859 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
860 next_server=this_server->next;
861 free(this_server);
862 }
864 return OK;
865 }
868 /* gets state and plugin output to return */
869 int get_results(void){
870 dhcp_offer *temp_offer;
871 requested_server *temp_server;
872 int result;
873 u_int32_t max_lease_time=0;
875 received_requested_address=FALSE;
877 /* checks responses from requested servers */
878 requested_responses=0;
879 if(requested_servers>0){
881 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
883 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
885 /* get max lease time we were offered */
886 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
887 max_lease_time=temp_offer->lease_time;
889 /* see if we got the address we requested */
890 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
891 received_requested_address=TRUE;
893 /* see if the servers we wanted a response from talked to us or not */
894 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
895 if(verbose){
896 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
897 printf(_(" Requested=%s"),inet_ntoa(temp_server->server_address));
898 if(temp_server->answered)
899 printf(_(" (duplicate)"));
900 printf(_("\n"));
901 }
902 if(temp_server->answered == FALSE){
903 requested_responses++;
904 temp_server->answered=TRUE;
905 }
906 }
907 }
908 }
910 }
912 /* else check and see if we got our requested address from any server */
913 else{
915 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
917 /* get max lease time we were offered */
918 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
919 max_lease_time=temp_offer->lease_time;
921 /* see if we got the address we requested */
922 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
923 received_requested_address=TRUE;
924 }
925 }
927 result=STATE_OK;
928 if(valid_responses==0)
929 result=STATE_CRITICAL;
930 else if(requested_servers>0 && requested_responses==0)
931 result=STATE_CRITICAL;
932 else if(requested_responses<requested_servers)
933 result=STATE_WARNING;
934 else if(request_specific_address==TRUE && received_requested_address==FALSE)
935 result=STATE_WARNING;
937 if(result==0) /* garrett honeycutt 2005 */
938 printf("OK: ");
939 else if(result==1)
940 printf("WARNING: ");
941 else if(result==2)
942 printf("CRITICAL: ");
943 else if(result==3)
944 printf("UNKNOWN: ");
946 /* we didn't receive any DHCPOFFERs */
947 if(dhcp_offer_list==NULL){
948 printf(_("No DHCPOFFERs were received.\n"));
949 return result;
950 }
952 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
954 if(requested_servers>0)
955 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
957 if(request_specific_address==TRUE)
958 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
960 printf(_(", max lease time = "));
961 if(max_lease_time==DHCP_INFINITE_TIME)
962 printf(_("Infinity"));
963 else
964 printf("%lu sec",(unsigned long)max_lease_time);
966 printf(".\n");
968 return result;
969 }
972 /* process command-line arguments */
973 int process_arguments(int argc, char **argv){
974 int c;
976 if(argc<1)
977 return ERROR;
979 c=0;
980 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
982 /*
983 if(is_option(argv[c]))
984 continue;
985 */
986 }
988 return validate_arguments();
989 }
993 int call_getopt(int argc, char **argv){
994 int c=0;
995 int i=0;
996 struct in_addr ipaddress;
998 int option_index = 0;
999 static struct option long_options[] =
1000 {
1001 {"serverip", required_argument,0,'s'},
1002 {"requestedip", required_argument,0,'r'},
1003 {"timeout", required_argument,0,'t'},
1004 {"interface", required_argument,0,'i'},
1005 {"verbose", no_argument, 0,'v'},
1006 {"version", no_argument, 0,'V'},
1007 {"help", no_argument, 0,'h'},
1008 {0,0,0,0}
1009 };
1011 while(1){
1012 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1014 i++;
1016 if(c==-1||c==EOF||c==1)
1017 break;
1019 switch(c){
1020 case 'w':
1021 case 'r':
1022 case 't':
1023 case 'i':
1024 i++;
1025 break;
1026 default:
1027 break;
1028 }
1030 switch(c){
1032 case 's': /* DHCP server address */
1033 if(inet_aton(optarg,&ipaddress))
1034 add_requested_server(ipaddress);
1035 /*
1036 else
1037 usage("Invalid server IP address\n");
1038 */
1039 break;
1041 case 'r': /* address we are requested from DHCP servers */
1042 if(inet_aton(optarg,&ipaddress)){
1043 requested_address=ipaddress;
1044 request_specific_address=TRUE;
1045 }
1046 /*
1047 else
1048 usage("Invalid requested IP address\n");
1049 */
1050 break;
1052 case 't': /* timeout */
1054 /*
1055 if(is_intnonneg(optarg))
1056 */
1057 if(atoi(optarg)>0)
1058 dhcpoffer_timeout=atoi(optarg);
1059 /*
1060 else
1061 usage("Time interval must be a nonnegative integer\n");
1062 */
1063 break;
1065 case 'i': /* interface name */
1067 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1068 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1070 break;
1072 case 'V': /* version */
1073 print_revision(progname,revision);
1074 exit(STATE_OK);
1076 case 'h': /* help */
1077 print_help();
1078 exit(STATE_OK);
1080 case 'v': /* verbose */
1081 verbose=1;
1082 break;
1084 case '?': /* help */
1085 usage2 (_("Unknown argument"), optarg);
1086 break;
1088 default:
1089 break;
1090 }
1091 }
1093 return i;
1094 }
1097 int validate_arguments(void){
1099 return OK;
1100 }
1103 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1104 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1106 /* get a message from a stream; return type of message */
1107 static int get_msg(int fd){
1108 int flags = 0;
1109 int res, ret;
1110 ctl_area[0] = 0;
1111 dat_area[0] = 0;
1112 ret = 0;
1113 res = getmsg(fd, &ctl, &dat, &flags);
1115 if(res < 0){
1116 if(errno == EINTR){
1117 return(GOT_INTR);
1118 }
1119 else{
1120 printf("%s\n", "get_msg FAILED.");
1121 return(GOT_ERR);
1122 }
1123 }
1124 if(ctl.len > 0){
1125 ret |= GOT_CTRL;
1126 }
1127 if(dat.len > 0){
1128 ret |= GOT_DATA;
1129 }
1131 return(ret);
1132 }
1134 /* verify that dl_primitive in ctl_area = prim */
1135 static int check_ctrl(int prim){
1136 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1138 if(err_ack->dl_primitive != prim){
1139 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1140 exit(STATE_UNKNOWN);
1141 }
1143 return 0;
1144 }
1146 /* put a control message on a stream */
1147 static int put_ctrl(int fd, int len, int pri){
1149 ctl.len = len;
1150 if(putmsg(fd, &ctl, 0, pri) < 0){
1151 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1152 exit(STATE_UNKNOWN);
1153 }
1155 return 0;
1156 }
1158 /* put a control + data message on a stream */
1159 static int put_both(int fd, int clen, int dlen, int pri){
1161 ctl.len = clen;
1162 dat.len = dlen;
1163 if(putmsg(fd, &ctl, &dat, pri) < 0){
1164 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1165 exit(STATE_UNKNOWN);
1166 }
1168 return 0;
1169 }
1171 /* open file descriptor and attach */
1172 static int dl_open(const char *dev, int unit, int *fd){
1173 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1175 if((*fd = open(dev, O_RDWR)) == -1){
1176 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1177 exit(STATE_UNKNOWN);
1178 }
1179 attach_req->dl_primitive = DL_ATTACH_REQ;
1180 attach_req->dl_ppa = unit;
1181 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1182 get_msg(*fd);
1183 return check_ctrl(DL_OK_ACK);
1184 }
1186 /* send DL_BIND_REQ */
1187 static int dl_bind(int fd, int sap, u_char *addr){
1188 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1189 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1191 bind_req->dl_primitive = DL_BIND_REQ;
1192 bind_req->dl_sap = sap;
1193 bind_req->dl_max_conind = 1;
1194 bind_req->dl_service_mode = DL_CLDLS;
1195 bind_req->dl_conn_mgmt = 0;
1196 bind_req->dl_xidtest_flg = 0;
1197 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1198 get_msg(fd);
1199 if (GOT_ERR == check_ctrl(DL_BIND_ACK)){
1200 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1201 exit(STATE_UNKNOWN);
1202 }
1203 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1204 bind_ack->dl_addr_length);
1206 return 0;
1207 }
1209 /***********************************************************************
1210 * interface:
1211 * function mac_addr_dlpi - get the mac address of the interface with
1212 * type dev (eg lnc, hme) and unit (0, 1 ..)
1213 *
1214 * parameter: addr: an array of six bytes, has to be allocated by the caller
1215 *
1216 * return: 0 if OK, -1 if the address could not be determined
1217 *
1218 *
1219 ***********************************************************************/
1221 long mac_addr_dlpi( const char *dev, int unit, u_char *addr){
1222 int fd;
1223 u_char mac_addr[25];
1225 if(GOT_ERR != dl_open(dev, unit, &fd)){
1226 if(GOT_ERR != dl_bind(fd, INSAP, mac_addr)){
1227 bcopy( mac_addr, addr, 6);
1228 return 0;
1229 }
1230 }
1231 close(fd);
1233 return -1;
1234 }
1236 /* Kompf 2000-2003 */
1237 #endif
1240 /* print usage help */
1241 void print_help(void){
1243 print_revision(progname,revision);
1245 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1246 printf (COPYRIGHT, copyright, email);
1248 printf(_("This plugin tests the availability of DHCP servers on a network.\n\n"));
1250 print_usage();
1252 printf (_(UT_HELP_VRSN));
1254 printf (_(UT_VERBOSE));
1256 printf(_("\
1257 -s, --serverip=IPADDRESS\n\
1258 IP address of DHCP server that we must hear from\n\
1259 -r, --requestedip=IPADDRESS\n\
1260 IP address that should be offered by at least one DHCP server\n\
1261 -t, --timeout=INTEGER\n\
1262 Seconds to wait for DHCPOFFER before timeout occurs\n\
1263 -i, --interface=STRING\n\
1264 Interface to to use for listening (i.e. eth0)\n"));
1266 return;
1267 }
1270 void print_usage(void){
1271 printf("\
1272 Usage: %s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1274 return;
1275 }