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 *
9 * License Information:
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * $Id$
26 *
27 *****************************************************************************/
29 const char *progname = "check_dhcp";
30 const char *revision = "$Revision$";
31 const char *copyright = "2001-2004";
32 const char *email = "nagiosplug-devel@lists.sourceforge.net";
34 #include "common.h"
35 #include "netutils.h"
36 #include "utils.h"
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <errno.h>
42 #include <unistd.h>
43 #include <sys/time.h>
44 #include <sys/ioctl.h>
45 #include <fcntl.h>
46 #include <getopt.h>
47 #include <sys/socket.h>
48 #include <sys/types.h>
49 #include <netdb.h>
50 #include <netinet/in.h>
51 #include <net/if.h>
52 #include <arpa/inet.h>
54 #if defined( __linux__ )
56 #include <linux/if_ether.h>
57 #include <features.h>
59 #elif defined (__bsd__)
61 #include <netinet/if_ether.h>
62 #include <sys/sysctl.h>
63 #include <net/if_dl.h>
65 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
67 #define INSAP 22
68 #define OUTSAP 24
70 #include <signal.h>
71 #include <ctype.h>
72 #include <sys/stropts.h>
73 #include <sys/poll.h>
74 #include <sys/dlpi.h>
76 #define bcopy(source, destination, length) memcpy(destination, source, length)
78 #define AREA_SZ 5000 /* buffer length in bytes */
79 static u_long ctl_area[AREA_SZ];
80 static u_long dat_area[AREA_SZ];
81 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
82 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
84 #define GOT_CTRL 1
85 #define GOT_DATA 2
86 #define GOT_BOTH 3
87 #define GOT_INTR 4
88 #define GOT_ERR 128
90 #define u_int8_t uint8_t
91 #define u_int16_t uint16_t
92 #define u_int32_t uint32_t
94 static int get_msg(int);
95 static int check_ctrl(int);
96 static int put_ctrl(int, int, int);
97 static int put_both(int, int, int, int);
98 static int dl_open(const char *, int, int *);
99 static int dl_bind(int, int, u_char *);
100 long mac_addr_dlpi( const char *, int, u_char *);
102 #endif
104 #define HAVE_GETOPT_H
107 /**** Common definitions ****/
109 #define STATE_OK 0
110 #define STATE_WARNING 1
111 #define STATE_CRITICAL 2
112 #define STATE_UNKNOWN -1
114 #define OK 0
115 #define ERROR -1
117 #define FALSE 0
118 #define TRUE 1
121 /**** DHCP definitions ****/
123 #define MAX_DHCP_CHADDR_LENGTH 16
124 #define MAX_DHCP_SNAME_LENGTH 64
125 #define MAX_DHCP_FILE_LENGTH 128
126 #define MAX_DHCP_OPTIONS_LENGTH 312
129 typedef struct dhcp_packet_struct{
130 u_int8_t op; /* packet type */
131 u_int8_t htype; /* type of hardware address for this machine (Ethernet, etc) */
132 u_int8_t hlen; /* length of hardware address (of this machine) */
133 u_int8_t hops; /* hops */
134 u_int32_t xid; /* random transaction id number - chosen by this machine */
135 u_int16_t secs; /* seconds used in timing */
136 u_int16_t flags; /* flags */
137 struct in_addr ciaddr; /* IP address of this machine (if we already have one) */
138 struct in_addr yiaddr; /* IP address of this machine (offered by the DHCP server) */
139 struct in_addr siaddr; /* IP address of DHCP server */
140 struct in_addr giaddr; /* IP address of DHCP relay */
141 unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH]; /* hardware address of this machine */
142 char sname [MAX_DHCP_SNAME_LENGTH]; /* name of DHCP server */
143 char file [MAX_DHCP_FILE_LENGTH]; /* boot file name (used for diskless booting?) */
144 char options[MAX_DHCP_OPTIONS_LENGTH]; /* options */
145 }dhcp_packet;
148 typedef struct dhcp_offer_struct{
149 struct in_addr server_address; /* address of DHCP server that sent this offer */
150 struct in_addr offered_address; /* the IP address that was offered to us */
151 u_int32_t lease_time; /* lease time in seconds */
152 u_int32_t renewal_time; /* renewal time in seconds */
153 u_int32_t rebinding_time; /* rebinding time in seconds */
154 struct dhcp_offer_struct *next;
155 }dhcp_offer;
158 typedef struct requested_server_struct{
159 struct in_addr server_address;
160 struct requested_server_struct *next;
161 }requested_server;
164 #define BOOTREQUEST 1
165 #define BOOTREPLY 2
167 #define DHCPDISCOVER 1
168 #define DHCPOFFER 2
169 #define DHCPREQUEST 3
170 #define DHCPDECLINE 4
171 #define DHCPACK 5
172 #define DHCPNACK 6
173 #define DHCPRELEASE 7
175 #define DHCP_OPTION_MESSAGE_TYPE 53
176 #define DHCP_OPTION_HOST_NAME 12
177 #define DHCP_OPTION_BROADCAST_ADDRESS 28
178 #define DHCP_OPTION_REQUESTED_ADDRESS 50
179 #define DHCP_OPTION_LEASE_TIME 51
180 #define DHCP_OPTION_RENEWAL_TIME 58
181 #define DHCP_OPTION_REBINDING_TIME 59
183 #define DHCP_INFINITE_TIME 0xFFFFFFFF
185 #define DHCP_BROADCAST_FLAG 32768
187 #define DHCP_SERVER_PORT 67
188 #define DHCP_CLIENT_PORT 68
190 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
191 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
193 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
195 char network_interface_name[8]="eth0";
197 u_int32_t packet_xid=0;
199 u_int32_t dhcp_lease_time=0;
200 u_int32_t dhcp_renewal_time=0;
201 u_int32_t dhcp_rebinding_time=0;
203 int dhcpoffer_timeout=2;
205 dhcp_offer *dhcp_offer_list=NULL;
206 requested_server *requested_server_list=NULL;
208 int valid_responses=0; /* number of valid DHCPOFFERs we received */
209 int requested_servers=0;
210 int requested_responses=0;
212 int request_specific_address=FALSE;
213 int received_requested_address=FALSE;
214 int verbose=0;
215 struct in_addr requested_address;
218 int process_arguments(int, char **);
219 int call_getopt(int, char **);
220 int validate_arguments(void);
221 void print_usage(void);
222 void print_help(void);
224 int get_hardware_address(int,char *);
226 int send_dhcp_discover(int);
227 int get_dhcp_offer(int);
229 int get_results(void);
231 int add_dhcp_offer(struct in_addr,dhcp_packet *);
232 int free_dhcp_offer_list(void);
233 int free_requested_server_list(void);
235 int create_dhcp_socket(void);
236 int close_dhcp_socket(int);
237 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
238 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
242 int main(int argc, char **argv){
243 int dhcp_socket;
244 int result;
246 setlocale (LC_ALL, "");
247 bindtextdomain (PACKAGE, LOCALEDIR);
248 textdomain (PACKAGE);
250 if(process_arguments(argc,argv)!=OK){
251 usage4 (_("Could not parse arguments"));
252 }
254 /* create socket for DHCP communications */
255 dhcp_socket=create_dhcp_socket();
257 /* get hardware address of client machine */
258 get_hardware_address(dhcp_socket,network_interface_name);
260 /* send DHCPDISCOVER packet */
261 send_dhcp_discover(dhcp_socket);
263 /* wait for a DHCPOFFER packet */
264 get_dhcp_offer(dhcp_socket);
266 /* close socket we created */
267 close_dhcp_socket(dhcp_socket);
269 /* determine state/plugin output to return */
270 result=get_results();
272 /* free allocated memory */
273 free_dhcp_offer_list();
274 free_requested_server_list();
276 return result;
277 }
281 /* determines hardware address on client machine */
282 int get_hardware_address(int sock,char *interface_name){
284 int i;
286 #if defined(__linux__)
287 struct ifreq ifr;
289 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
291 /* try and grab hardware address of requested interface */
292 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
293 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
294 exit(STATE_UNKNOWN);
295 }
297 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
299 #elif defined(__bsd__)
300 /* King 2004 see ACKNOWLEDGEMENTS */
302 int mib[6], len;
303 char *buf;
304 unsigned char *ptr;
305 struct if_msghdr *ifm;
306 struct sockaddr_dl *sdl;
308 mib[0] = CTL_NET;
309 mib[1] = AF_ROUTE;
310 mib[2] = 0;
311 mib[3] = AF_LINK;
312 mib[4] = NET_RT_IFLIST;
314 if ((mib[5] = if_nametoindex(interface_name)) == 0) {
315 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
316 exit(STATE_UNKNOWN);
317 }
319 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
320 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
321 exit(STATE_UNKNOWN);
322 }
324 if ((buf = malloc(len)) == NULL) {
325 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
326 exit(4);
327 }
329 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
330 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
331 exit(STATE_UNKNOWN);
332 }
334 ifm = (struct if_msghdr *)buf;
335 sdl = (struct sockaddr_dl *)(ifm + 1);
336 ptr = (unsigned char *)LLADDR(sdl);
337 memcpy(&client_hardware_address[0], ptr, 6) ;
338 /* King 2004 */
340 #elif defined(__sun__) || defined(__solaris__)
342 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
343 long stat;
344 char dev[20] = "/dev/";
345 char *p;
346 int unit;
348 for (p = interface_name; *p && isalpha(*p); p++)
349 /* no-op */ ;
350 if ( p != '\0' ) {
351 unit = atoi(p) ;
352 *p = '\0' ;
353 strncat(dev, interface_name, 6) ;
354 } else {
355 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
356 exit(STATE_UNKNOWN);
357 }
358 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
359 if (stat != 0) {
360 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
361 exit(STATE_UNKNOWN);
362 }
364 #elif defined(__hpux__)
366 long stat;
367 char dev[20] = "/dev/dlpi" ;
368 int unit = 0;
370 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
371 if (stat != 0) {
372 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
373 exit(STATE_UNKNOWN);
374 }
375 /* Kompf 2000-2003 */
377 #else
378 printf(_("Error: can't get MAC address for this architecture.\n"));
379 exit(STATE_UNKNOWN);
380 #endif
382 if (verbose) {
383 printf(_("Hardware address: "));
384 for (i=0; i<6; ++i)
385 printf("%2.2x", client_hardware_address[i]);
386 printf( "\n");
387 }
389 return OK;
390 }
393 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
394 int send_dhcp_discover(int sock){
395 dhcp_packet discover_packet;
396 struct sockaddr_in sockaddr_broadcast;
399 /* clear the packet data structure */
400 bzero(&discover_packet,sizeof(discover_packet));
403 /* boot request flag (backward compatible with BOOTP servers) */
404 discover_packet.op=BOOTREQUEST;
406 /* hardware address type */
407 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
409 /* length of our hardware address */
410 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
412 discover_packet.hops=0;
414 /* transaction id is supposed to be random */
415 srand(time(NULL));
416 packet_xid=random();
417 discover_packet.xid=htonl(packet_xid);
419 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
420 /* downright bizzarre... */
421 ntohl(discover_packet.xid);
423 /*discover_packet.secs=htons(65535);*/
424 discover_packet.secs=0xFF;
426 /* tell server it should broadcast its response */
427 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
429 /* our hardware address */
430 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
432 /* first four bytes of options field is magic cookie (as per RFC 2132) */
433 discover_packet.options[0]='\x63';
434 discover_packet.options[1]='\x82';
435 discover_packet.options[2]='\x53';
436 discover_packet.options[3]='\x63';
438 /* DHCP message type is embedded in options field */
439 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
440 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
441 discover_packet.options[6]=DHCPDISCOVER;
443 /* the IP address we're requesting */
444 if(request_specific_address==TRUE){
445 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
446 discover_packet.options[8]='\x04';
447 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
448 }
450 /* send the DHCPDISCOVER packet to broadcast address */
451 sockaddr_broadcast.sin_family=AF_INET;
452 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
453 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
454 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
457 if (verbose) {
458 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
459 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
460 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
461 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
462 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
463 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
464 }
466 /* send the DHCPDISCOVER packet out */
467 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
469 if (verbose)
470 printf("\n\n");
472 return OK;
473 }
478 /* waits for a DHCPOFFER message from one or more DHCP servers */
479 int get_dhcp_offer(int sock){
480 dhcp_packet offer_packet;
481 struct sockaddr_in source;
482 int result=OK;
483 int timeout=1;
484 int responses=0;
485 int x;
486 time_t start_time;
487 time_t current_time;
489 time(&start_time);
491 /* receive as many responses as we can */
492 for(responses=0,valid_responses=0;;){
494 time(¤t_time);
495 if((current_time-start_time)>=dhcpoffer_timeout)
496 break;
498 if (verbose)
499 printf("\n\n");
501 bzero(&source,sizeof(source));
502 bzero(&offer_packet,sizeof(offer_packet));
504 result=OK;
505 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
507 if(result!=OK){
508 if (verbose)
509 printf(_("Result=ERROR\n"));
511 continue;
512 }
513 else{
514 if (verbose)
515 printf(_("Result=OK\n"));
517 responses++;
518 }
520 if (verbose) {
521 printf(_("DHCPOFFER from IP address %s\n"),inet_ntoa(source.sin_addr));
522 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
523 }
525 /* check packet xid to see if its the same as the one we used in the discover packet */
526 if(ntohl(offer_packet.xid)!=packet_xid){
527 if (verbose)
528 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
530 continue;
531 }
533 /* check hardware address */
534 result=OK;
535 if (verbose)
536 printf("DHCPOFFER chaddr: ");
538 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
539 if (verbose)
540 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
542 if(offer_packet.chaddr[x]!=client_hardware_address[x])
543 result=ERROR;
544 }
545 if (verbose)
546 printf("\n");
548 if(result==ERROR){
549 if (verbose)
550 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
552 continue;
553 }
555 if (verbose) {
556 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
557 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
558 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
559 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
560 }
562 add_dhcp_offer(source.sin_addr,&offer_packet);
564 valid_responses++;
565 }
567 if (verbose) {
568 printf(_("Total responses seen on the wire: %d\n"),responses);
569 printf(_("Valid responses for this machine: %d\n"),valid_responses);
570 }
572 return OK;
573 }
577 /* sends a DHCP packet */
578 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
579 struct sockaddr_in myname;
580 int result;
582 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
584 if (verbose)
585 printf(_("send_dhcp_packet result: %d\n"),result);
587 if(result<0)
588 return ERROR;
590 return OK;
591 }
595 /* receives a DHCP packet */
596 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
597 struct timeval tv;
598 fd_set readfds;
599 int recv_result;
600 socklen_t address_size;
601 struct sockaddr_in source_address;
604 /* wait for data to arrive (up time timeout) */
605 tv.tv_sec=timeout;
606 tv.tv_usec=0;
607 FD_ZERO(&readfds);
608 FD_SET(sock,&readfds);
609 select(sock+1,&readfds,NULL,NULL,&tv);
611 /* make sure some data has arrived */
612 if(!FD_ISSET(sock,&readfds)){
613 if (verbose)
614 printf(_("No (more) data received\n"));
615 return ERROR;
616 }
618 else{
620 /* 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
621 not being interpreted correctly. sigh... */
622 bzero(&source_address,sizeof(source_address));
623 address_size=sizeof(source_address);
624 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
625 if (verbose)
626 printf("recv_result_1: %d\n",recv_result);
627 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
628 if (verbose)
629 printf("recv_result_2: %d\n",recv_result);
631 if(recv_result==-1){
632 if (verbose) {
633 printf(_("recvfrom() failed, "));
634 printf("errno: (%d) -> %s\n",errno,strerror(errno));
635 }
636 return ERROR;
637 }
638 else{
639 if (verbose) {
640 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
641 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
642 }
644 memcpy(address,&source_address,sizeof(source_address));
645 return OK;
646 }
647 }
649 return OK;
650 }
653 /* creates a socket for DHCP communication */
654 int create_dhcp_socket(void){
655 struct sockaddr_in myname;
656 struct ifreq interface;
657 int sock;
658 int flag=1;
660 /* Set up the address we're going to bind to. */
661 bzero(&myname,sizeof(myname));
662 myname.sin_family=AF_INET;
663 myname.sin_port=htons(DHCP_CLIENT_PORT);
664 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
665 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
667 /* create a socket for DHCP communications */
668 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
669 if(sock<0){
670 printf(_("Error: Could not create socket!\n"));
671 exit(STATE_UNKNOWN);
672 }
674 if (verbose)
675 printf("DHCP socket: %d\n",sock);
677 /* set the reuse address flag so we don't get errors when restarting */
678 flag=1;
679 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
680 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
681 exit(STATE_UNKNOWN);
682 }
684 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
685 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
686 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
687 exit(STATE_UNKNOWN);
688 }
690 /* bind socket to interface */
691 #if defined(__linux__)
692 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
693 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
694 printf(_("Error: Could not bind socket to interface %s. Check your privileges...\n"),network_interface_name);
695 exit(STATE_UNKNOWN);
696 }
698 #else
699 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
700 #endif
702 /* bind the socket */
703 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
704 printf(_("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n"),DHCP_CLIENT_PORT);
705 exit(STATE_UNKNOWN);
706 }
708 return sock;
709 }
712 /* closes DHCP socket */
713 int close_dhcp_socket(int sock){
715 close(sock);
717 return OK;
718 }
721 /* adds a requested server address to list in memory */
722 int add_requested_server(struct in_addr server_address){
723 requested_server *new_server;
725 new_server=(requested_server *)malloc(sizeof(requested_server));
726 if(new_server==NULL)
727 return ERROR;
729 new_server->server_address=server_address;
731 new_server->next=requested_server_list;
732 requested_server_list=new_server;
734 requested_servers++;
736 if (verbose)
737 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
739 return OK;
740 }
745 /* adds a DHCP OFFER to list in memory */
746 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
747 dhcp_offer *new_offer;
748 int x;
749 int y;
750 unsigned option_type;
751 unsigned option_length;
753 if(offer_packet==NULL)
754 return ERROR;
756 /* process all DHCP options present in the packet */
757 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
759 /* end of options (0 is really just a pad, but bail out anyway) */
760 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
761 break;
763 /* get option type */
764 option_type=offer_packet->options[x++];
766 /* get option length */
767 option_length=offer_packet->options[x++];
769 if (verbose)
770 printf("Option: %d (0x%02X)\n",option_type,option_length);
772 /* get option data */
773 if(option_type==DHCP_OPTION_LEASE_TIME)
774 dhcp_lease_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
775 if(option_type==DHCP_OPTION_RENEWAL_TIME)
776 dhcp_renewal_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
777 if(option_type==DHCP_OPTION_REBINDING_TIME)
778 dhcp_rebinding_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
780 /* skip option data we're ignoring */
781 else
782 for(y=0;y<option_length;y++,x++);
783 }
785 if (verbose) {
786 if(dhcp_lease_time==DHCP_INFINITE_TIME)
787 printf(_("Lease Time: Infinite\n"));
788 else
789 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
790 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
791 printf(_("Renewal Time: Infinite\n"));
792 else
793 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
794 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
795 printf(_("Rebinding Time: Infinite\n"));
796 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
797 }
799 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
801 if(new_offer==NULL)
802 return ERROR;
804 new_offer->server_address=source;
805 new_offer->offered_address=offer_packet->yiaddr;
806 new_offer->lease_time=dhcp_lease_time;
807 new_offer->renewal_time=dhcp_renewal_time;
808 new_offer->rebinding_time=dhcp_rebinding_time;
811 if (verbose) {
812 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
813 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
814 }
816 /* add new offer to head of list */
817 new_offer->next=dhcp_offer_list;
818 dhcp_offer_list=new_offer;
820 return OK;
821 }
824 /* frees memory allocated to DHCP OFFER list */
825 int free_dhcp_offer_list(void){
826 dhcp_offer *this_offer;
827 dhcp_offer *next_offer;
829 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
830 next_offer=this_offer->next;
831 free(this_offer);
832 }
834 return OK;
835 }
838 /* frees memory allocated to requested server list */
839 int free_requested_server_list(void){
840 requested_server *this_server;
841 requested_server *next_server;
843 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
844 next_server=this_server->next;
845 free(this_server);
846 }
848 return OK;
849 }
852 /* gets state and plugin output to return */
853 int get_results(void){
854 dhcp_offer *temp_offer;
855 requested_server *temp_server;
856 int result;
857 u_int32_t max_lease_time=0;
859 received_requested_address=FALSE;
861 /* checks responses from requested servers */
862 requested_responses=0;
863 if(requested_servers>0){
865 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
867 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
869 /* get max lease time we were offered */
870 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
871 max_lease_time=temp_offer->lease_time;
873 /* see if we got the address we requested */
874 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
875 received_requested_address=TRUE;
877 /* see if the servers we wanted a response from talked to us or not */
878 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
879 if (verbose) {
880 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
881 printf(_(" Requested=%s\n"),inet_ntoa(temp_server->server_address));
882 }
883 requested_responses++;
884 }
885 }
886 }
888 }
890 /* else check and see if we got our requested address from any server */
891 else{
893 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
895 /* get max lease time we were offered */
896 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
897 max_lease_time=temp_offer->lease_time;
899 /* see if we got the address we requested */
900 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
901 received_requested_address=TRUE;
902 }
903 }
905 result=STATE_OK;
906 if(valid_responses==0)
907 result=STATE_CRITICAL;
908 else if(requested_servers>0 && requested_responses==0)
909 result=STATE_CRITICAL;
910 else if(requested_responses<requested_servers)
911 result=STATE_WARNING;
912 else if(request_specific_address==TRUE && received_requested_address==FALSE)
913 result=STATE_WARNING;
916 printf("DHCP %s: ",(result==STATE_OK)?"ok":"problem");
918 /* we didn't receive any DHCPOFFERs */
919 if(dhcp_offer_list==NULL){
920 printf(_("No DHCPOFFERs were received.\n"));
921 return result;
922 }
924 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
926 if(requested_servers>0)
927 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
929 if(request_specific_address==TRUE)
930 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
932 printf(_(", max lease time = "));
933 if(max_lease_time==DHCP_INFINITE_TIME)
934 printf(_("Infinity"));
935 else
936 printf("%lu sec",(unsigned long)max_lease_time);
938 printf(".\n");
940 return result;
941 }
944 /* process command-line arguments */
945 int process_arguments(int argc, char **argv){
946 int c;
948 if(argc<1)
949 return ERROR;
951 c=0;
952 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
954 /*
955 if(is_option(argv[c]))
956 continue;
957 */
958 }
960 return validate_arguments();
961 }
965 int call_getopt(int argc, char **argv){
966 int c=0;
967 int i=0;
968 struct in_addr ipaddress;
970 #ifdef HAVE_GETOPT_H
971 int option_index = 0;
972 static struct option long_options[] =
973 {
974 {"serverip", required_argument,0,'s'},
975 {"requestedip", required_argument,0,'r'},
976 {"timeout", required_argument,0,'t'},
977 {"interface", required_argument,0,'i'},
978 {"verbose", no_argument, 0,'v'},
979 {"version", no_argument, 0,'V'},
980 {"help", no_argument, 0,'h'},
981 {0,0,0,0}
982 };
983 #endif
985 while(1){
986 #ifdef HAVE_GETOPT_H
987 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
988 #else
989 c=getopt(argc,argv,"+?hVvt:s:r:t:i:");
990 #endif
992 i++;
994 if(c==-1||c==EOF||c==1)
995 break;
997 switch(c){
998 case 'w':
999 case 'r':
1000 case 't':
1001 case 'i':
1002 i++;
1003 break;
1004 default:
1005 break;
1006 }
1008 switch(c){
1010 case 's': /* DHCP server address */
1011 if(inet_aton(optarg,&ipaddress))
1012 add_requested_server(ipaddress);
1013 /*
1014 else
1015 usage("Invalid server IP address\n");
1016 */
1017 break;
1019 case 'r': /* address we are requested from DHCP servers */
1020 if(inet_aton(optarg,&ipaddress)){
1021 requested_address=ipaddress;
1022 request_specific_address=TRUE;
1023 }
1024 /*
1025 else
1026 usage("Invalid requested IP address\n");
1027 */
1028 break;
1030 case 't': /* timeout */
1032 /*
1033 if(is_intnonneg(optarg))
1034 */
1035 if(atoi(optarg)>0)
1036 dhcpoffer_timeout=atoi(optarg);
1037 /*
1038 else
1039 usage("Time interval must be a nonnegative integer\n");
1040 */
1041 break;
1043 case 'i': /* interface name */
1045 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1046 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1048 break;
1050 case 'V': /* version */
1051 print_revision(progname,revision);
1052 exit(STATE_OK);
1054 case 'h': /* help */
1055 print_help();
1056 exit(STATE_OK);
1058 case 'v': /* verbose */
1059 verbose=1;
1060 break;
1062 case '?': /* help */
1063 usage2 (_("Unknown argument"), optarg);
1064 break;
1066 default:
1067 break;
1068 }
1069 }
1071 return i;
1072 }
1075 int validate_arguments(void){
1077 return OK;
1078 }
1080 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1082 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1084 /* get a message from a stream; return type of message */
1085 static int get_msg(int fd)
1086 {
1087 int flags = 0;
1088 int res, ret;
1089 ctl_area[0] = 0;
1090 dat_area[0] = 0;
1091 ret = 0;
1092 res = getmsg(fd, &ctl, &dat, &flags);
1094 if(res < 0) {
1095 if(errno == EINTR) {
1096 return(GOT_INTR);
1097 } else {
1098 printf("%s\n", "get_msg FAILED.");
1099 return(GOT_ERR);
1100 }
1101 }
1102 if(ctl.len > 0) {
1103 ret |= GOT_CTRL;
1104 }
1105 if(dat.len > 0) {
1106 ret |= GOT_DATA;
1107 }
1108 return(ret);
1109 }
1111 /* verify that dl_primitive in ctl_area = prim */
1112 static int check_ctrl(int prim)
1113 {
1114 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1115 if(err_ack->dl_primitive != prim) {
1116 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1117 exit(STATE_UNKNOWN);
1118 }
1119 return 0;
1120 }
1122 /* put a control message on a stream */
1123 static int put_ctrl(int fd, int len, int pri)
1124 {
1125 ctl.len = len;
1126 if(putmsg(fd, &ctl, 0, pri) < 0) {
1127 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1128 exit(STATE_UNKNOWN);
1129 }
1130 return 0;
1131 }
1133 /* put a control + data message on a stream */
1134 static int put_both(int fd, int clen, int dlen, int pri)
1135 {
1136 ctl.len = clen;
1137 dat.len = dlen;
1138 if(putmsg(fd, &ctl, &dat, pri) < 0) {
1139 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1140 exit(STATE_UNKNOWN);
1141 }
1142 return 0;
1143 }
1145 /* open file descriptor and attach */
1146 static int dl_open(const char *dev, int unit, int *fd)
1147 {
1148 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1149 if((*fd = open(dev, O_RDWR)) == -1) {
1150 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1151 exit(STATE_UNKNOWN);
1152 }
1153 attach_req->dl_primitive = DL_ATTACH_REQ;
1154 attach_req->dl_ppa = unit;
1155 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1156 get_msg(*fd);
1157 return check_ctrl(DL_OK_ACK);
1158 }
1160 /* send DL_BIND_REQ */
1161 static int dl_bind(int fd, int sap, u_char *addr)
1162 {
1163 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1164 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1165 bind_req->dl_primitive = DL_BIND_REQ;
1166 bind_req->dl_sap = sap;
1167 bind_req->dl_max_conind = 1;
1168 bind_req->dl_service_mode = DL_CLDLS;
1169 bind_req->dl_conn_mgmt = 0;
1170 bind_req->dl_xidtest_flg = 0;
1171 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1172 get_msg(fd);
1173 if (GOT_ERR == check_ctrl(DL_BIND_ACK)) {
1174 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1175 exit(STATE_UNKNOWN);
1176 }
1177 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1178 bind_ack->dl_addr_length);
1179 return 0;
1180 }
1182 /***********************************************************************
1183 * interface:
1184 * function mac_addr_dlpi - get the mac address of the interface with
1185 * type dev (eg lnc, hme) and unit (0, 1 ..)
1186 *
1187 * parameter: addr: an array of six bytes, has to be allocated by the caller
1188 *
1189 * return: 0 if OK, -1 if the address could not be determined
1190 *
1191 *
1192 ***********************************************************************/
1194 long mac_addr_dlpi( const char *dev, int unit, u_char *addr) {
1196 int fd;
1197 u_char mac_addr[25];
1199 if (GOT_ERR != dl_open(dev, unit, &fd)) {
1200 if (GOT_ERR != dl_bind(fd, INSAP, mac_addr)) {
1201 bcopy( mac_addr, addr, 6);
1202 return 0;
1203 }
1204 }
1205 close(fd);
1206 return -1;
1207 }
1209 /* Kompf 2000-2003 */
1211 #endif
1214 /* print usage help */
1215 void print_help(void){
1217 print_revision(progname,revision);
1219 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n\n");
1220 printf (COPYRIGHT, copyright, email);
1222 printf(_("This plugin tests the availability of DHCP servers on a network.\n\n"));
1224 print_usage();
1226 printf(_("\
1227 -s, --serverip=IPADDRESS\n\
1228 IP address of DHCP server that we must hear from\n\
1229 -r, --requestedip=IPADDRESS\n\
1230 IP address that should be offered by at least one DHCP server\n\
1231 -t, --timeout=INTEGER\n\
1232 Seconds to wait for DHCPOFFER before timeout occurs\n\
1233 -i, --interface=STRING\n\
1234 Interface to to use for listening (i.e. eth0)\n\
1235 -v, --verbose\n\
1236 Print extra information (command-line use only)\n\
1237 -h, --help\n\
1238 Print detailed help screen\n\
1239 -V, --version\n\
1240 Print version information\n"));
1241 }
1244 void print_usage(void)
1245 {
1246 printf("\
1247 Usage: %s [-s serverip] [-r requestedip] [-t timeout] [-i interface]\n\
1248 [-v]",progname);
1249 }