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 struct requested_server_struct *next;
156 }requested_server;
159 #define BOOTREQUEST 1
160 #define BOOTREPLY 2
162 #define DHCPDISCOVER 1
163 #define DHCPOFFER 2
164 #define DHCPREQUEST 3
165 #define DHCPDECLINE 4
166 #define DHCPACK 5
167 #define DHCPNACK 6
168 #define DHCPRELEASE 7
170 #define DHCP_OPTION_MESSAGE_TYPE 53
171 #define DHCP_OPTION_HOST_NAME 12
172 #define DHCP_OPTION_BROADCAST_ADDRESS 28
173 #define DHCP_OPTION_REQUESTED_ADDRESS 50
174 #define DHCP_OPTION_LEASE_TIME 51
175 #define DHCP_OPTION_RENEWAL_TIME 58
176 #define DHCP_OPTION_REBINDING_TIME 59
178 #define DHCP_INFINITE_TIME 0xFFFFFFFF
180 #define DHCP_BROADCAST_FLAG 32768
182 #define DHCP_SERVER_PORT 67
183 #define DHCP_CLIENT_PORT 68
185 #define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
186 #define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
188 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
190 char network_interface_name[IFNAMSIZ]="eth0";
192 u_int32_t packet_xid=0;
194 u_int32_t dhcp_lease_time=0;
195 u_int32_t dhcp_renewal_time=0;
196 u_int32_t dhcp_rebinding_time=0;
198 int dhcpoffer_timeout=2;
200 dhcp_offer *dhcp_offer_list=NULL;
201 requested_server *requested_server_list=NULL;
203 int valid_responses=0; /* number of valid DHCPOFFERs we received */
204 int requested_servers=0;
205 int requested_responses=0;
207 int request_specific_address=FALSE;
208 int received_requested_address=FALSE;
209 int verbose=0;
210 struct in_addr requested_address;
213 int process_arguments(int, char **);
214 int call_getopt(int, char **);
215 int validate_arguments(void);
216 void print_usage(void);
217 void print_help(void);
219 int get_hardware_address(int,char *);
221 int send_dhcp_discover(int);
222 int get_dhcp_offer(int);
224 int get_results(void);
226 int add_dhcp_offer(struct in_addr,dhcp_packet *);
227 int free_dhcp_offer_list(void);
228 int free_requested_server_list(void);
230 int create_dhcp_socket(void);
231 int close_dhcp_socket(int);
232 int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
233 int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
237 int main(int argc, char **argv){
238 int dhcp_socket;
239 int result = STATE_UNKNOWN;
241 setlocale (LC_ALL, "");
242 bindtextdomain (PACKAGE, LOCALEDIR);
243 textdomain (PACKAGE);
245 if(process_arguments(argc,argv)!=OK){
246 usage4 (_("Could not parse arguments"));
247 }
249 /* create socket for DHCP communications */
250 dhcp_socket=create_dhcp_socket();
252 /* get hardware address of client machine */
253 get_hardware_address(dhcp_socket,network_interface_name);
255 /* send DHCPDISCOVER packet */
256 send_dhcp_discover(dhcp_socket);
258 /* wait for a DHCPOFFER packet */
259 get_dhcp_offer(dhcp_socket);
261 /* close socket we created */
262 close_dhcp_socket(dhcp_socket);
264 /* determine state/plugin output to return */
265 result=get_results();
267 /* free allocated memory */
268 free_dhcp_offer_list();
269 free_requested_server_list();
271 return result;
272 }
276 /* determines hardware address on client machine */
277 int get_hardware_address(int sock,char *interface_name){
279 int i;
281 #if defined(__linux__)
282 struct ifreq ifr;
284 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
286 /* try and grab hardware address of requested interface */
287 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
288 printf(_("Error: Could not get hardware address of interface '%s'\n"),interface_name);
289 exit(STATE_UNKNOWN);
290 }
292 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
294 #elif defined(__bsd__)
295 /* King 2004 see ACKNOWLEDGEMENTS */
297 int mib[6], len;
298 char *buf;
299 unsigned char *ptr;
300 struct if_msghdr *ifm;
301 struct sockaddr_dl *sdl;
303 mib[0] = CTL_NET;
304 mib[1] = AF_ROUTE;
305 mib[2] = 0;
306 mib[3] = AF_LINK;
307 mib[4] = NET_RT_IFLIST;
309 if ((mib[5] = if_nametoindex(interface_name)) == 0) {
310 printf(_("Error: if_nametoindex error - %s.\n"), strerror(errno));
311 exit(STATE_UNKNOWN);
312 }
314 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
315 printf(_("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n"), interface_name, strerror(errno));
316 exit(STATE_UNKNOWN);
317 }
319 if ((buf = malloc(len)) == NULL) {
320 printf(_("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n"), interface_name, strerror(errno));
321 exit(4);
322 }
324 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
325 printf(_("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n"), interface_name, strerror(errno));
326 exit(STATE_UNKNOWN);
327 }
329 ifm = (struct if_msghdr *)buf;
330 sdl = (struct sockaddr_dl *)(ifm + 1);
331 ptr = (unsigned char *)LLADDR(sdl);
332 memcpy(&client_hardware_address[0], ptr, 6) ;
333 /* King 2004 */
335 #elif defined(__sun__) || defined(__solaris__)
337 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
338 long stat;
339 char dev[20] = "/dev/";
340 char *p;
341 int unit;
343 for (p = interface_name; *p && isalpha(*p); p++)
344 /* no-op */ ;
345 if ( p != '\0' ) {
346 unit = atoi(p) ;
347 *p = '\0' ;
348 strncat(dev, interface_name, 6) ;
349 } else {
350 printf(_("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n"), interface_name);
351 exit(STATE_UNKNOWN);
352 }
353 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
354 if (stat != 0) {
355 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
356 exit(STATE_UNKNOWN);
357 }
359 #elif defined(__hpux__)
361 long stat;
362 char dev[20] = "/dev/dlpi" ;
363 int unit = 0;
365 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
366 if (stat != 0) {
367 printf(_("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n"), dev, unit);
368 exit(STATE_UNKNOWN);
369 }
370 /* Kompf 2000-2003 */
372 #else
373 printf(_("Error: can't get MAC address for this architecture.\n"));
374 exit(STATE_UNKNOWN);
375 #endif
377 if (verbose) {
378 printf(_("Hardware address: "));
379 for (i=0; i<6; ++i)
380 printf("%2.2x", client_hardware_address[i]);
381 printf( "\n");
382 }
384 return OK;
385 }
388 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
389 int send_dhcp_discover(int sock){
390 dhcp_packet discover_packet;
391 struct sockaddr_in sockaddr_broadcast;
394 /* clear the packet data structure */
395 bzero(&discover_packet,sizeof(discover_packet));
398 /* boot request flag (backward compatible with BOOTP servers) */
399 discover_packet.op=BOOTREQUEST;
401 /* hardware address type */
402 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
404 /* length of our hardware address */
405 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
407 discover_packet.hops=0;
409 /* transaction id is supposed to be random */
410 srand(time(NULL));
411 packet_xid=random();
412 discover_packet.xid=htonl(packet_xid);
414 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
415 /* downright bizzarre... */
416 ntohl(discover_packet.xid);
418 /*discover_packet.secs=htons(65535);*/
419 discover_packet.secs=0xFF;
421 /* tell server it should broadcast its response */
422 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
424 /* our hardware address */
425 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
427 /* first four bytes of options field is magic cookie (as per RFC 2132) */
428 discover_packet.options[0]='\x63';
429 discover_packet.options[1]='\x82';
430 discover_packet.options[2]='\x53';
431 discover_packet.options[3]='\x63';
433 /* DHCP message type is embedded in options field */
434 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
435 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
436 discover_packet.options[6]=DHCPDISCOVER;
438 /* the IP address we're requesting */
439 if(request_specific_address==TRUE){
440 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
441 discover_packet.options[8]='\x04';
442 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
443 }
445 /* send the DHCPDISCOVER packet to broadcast address */
446 sockaddr_broadcast.sin_family=AF_INET;
447 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
448 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
449 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
452 if (verbose) {
453 printf(_("DHCPDISCOVER to %s port %d\n"),inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
454 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
455 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
456 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
457 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
458 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
459 }
461 /* send the DHCPDISCOVER packet out */
462 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
464 if (verbose)
465 printf("\n\n");
467 return OK;
468 }
473 /* waits for a DHCPOFFER message from one or more DHCP servers */
474 int get_dhcp_offer(int sock){
475 dhcp_packet offer_packet;
476 struct sockaddr_in source;
477 int result=OK;
478 int timeout=1;
479 int responses=0;
480 int x;
481 time_t start_time;
482 time_t current_time;
484 time(&start_time);
486 /* receive as many responses as we can */
487 for(responses=0,valid_responses=0;;){
489 time(¤t_time);
490 if((current_time-start_time)>=dhcpoffer_timeout)
491 break;
493 if (verbose)
494 printf("\n\n");
496 bzero(&source,sizeof(source));
497 bzero(&offer_packet,sizeof(offer_packet));
499 result=OK;
500 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
502 if(result!=OK){
503 if (verbose)
504 printf(_("Result=ERROR\n"));
506 continue;
507 }
508 else{
509 if (verbose)
510 printf(_("Result=OK\n"));
512 responses++;
513 }
515 if (verbose) {
516 printf(_("DHCPOFFER from IP address %s\n"),inet_ntoa(source.sin_addr));
517 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
518 }
520 /* check packet xid to see if its the same as the one we used in the discover packet */
521 if(ntohl(offer_packet.xid)!=packet_xid){
522 if (verbose)
523 printf(_("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);
525 continue;
526 }
528 /* check hardware address */
529 result=OK;
530 if (verbose)
531 printf("DHCPOFFER chaddr: ");
533 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
534 if (verbose)
535 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
537 if(offer_packet.chaddr[x]!=client_hardware_address[x])
538 result=ERROR;
539 }
540 if (verbose)
541 printf("\n");
543 if(result==ERROR){
544 if (verbose)
545 printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));
547 continue;
548 }
550 if (verbose) {
551 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
552 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
553 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
554 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
555 }
557 add_dhcp_offer(source.sin_addr,&offer_packet);
559 valid_responses++;
560 }
562 if (verbose) {
563 printf(_("Total responses seen on the wire: %d\n"),responses);
564 printf(_("Valid responses for this machine: %d\n"),valid_responses);
565 }
567 return OK;
568 }
572 /* sends a DHCP packet */
573 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
574 struct sockaddr_in myname;
575 int result;
577 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
579 if (verbose)
580 printf(_("send_dhcp_packet result: %d\n"),result);
582 if(result<0)
583 return ERROR;
585 return OK;
586 }
590 /* receives a DHCP packet */
591 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
592 struct timeval tv;
593 fd_set readfds;
594 int recv_result;
595 socklen_t address_size;
596 struct sockaddr_in source_address;
599 /* wait for data to arrive (up time timeout) */
600 tv.tv_sec=timeout;
601 tv.tv_usec=0;
602 FD_ZERO(&readfds);
603 FD_SET(sock,&readfds);
604 select(sock+1,&readfds,NULL,NULL,&tv);
606 /* make sure some data has arrived */
607 if(!FD_ISSET(sock,&readfds)){
608 if (verbose)
609 printf(_("No (more) data received\n"));
610 return ERROR;
611 }
613 else{
615 /* 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
616 not being interpreted correctly. sigh... */
617 bzero(&source_address,sizeof(source_address));
618 address_size=sizeof(source_address);
619 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
620 if (verbose)
621 printf("recv_result_1: %d\n",recv_result);
622 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
623 if (verbose)
624 printf("recv_result_2: %d\n",recv_result);
626 if(recv_result==-1){
627 if (verbose) {
628 printf(_("recvfrom() failed, "));
629 printf("errno: (%d) -> %s\n",errno,strerror(errno));
630 }
631 return ERROR;
632 }
633 else{
634 if (verbose) {
635 printf(_("receive_dhcp_packet() result: %d\n"),recv_result);
636 printf(_("receive_dhcp_packet() source: %s\n"),inet_ntoa(source_address.sin_addr));
637 }
639 memcpy(address,&source_address,sizeof(source_address));
640 return OK;
641 }
642 }
644 return OK;
645 }
648 /* creates a socket for DHCP communication */
649 int create_dhcp_socket(void){
650 struct sockaddr_in myname;
651 struct ifreq interface;
652 int sock;
653 int flag=1;
655 /* Set up the address we're going to bind to. */
656 bzero(&myname,sizeof(myname));
657 myname.sin_family=AF_INET;
658 myname.sin_port=htons(DHCP_CLIENT_PORT);
659 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
660 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
662 /* create a socket for DHCP communications */
663 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
664 if(sock<0){
665 printf(_("Error: Could not create socket!\n"));
666 exit(STATE_UNKNOWN);
667 }
669 if (verbose)
670 printf("DHCP socket: %d\n",sock);
672 /* set the reuse address flag so we don't get errors when restarting */
673 flag=1;
674 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
675 printf(_("Error: Could not set reuse address option on DHCP socket!\n"));
676 exit(STATE_UNKNOWN);
677 }
679 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
680 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
681 printf(_("Error: Could not set broadcast option on DHCP socket!\n"));
682 exit(STATE_UNKNOWN);
683 }
685 /* bind socket to interface */
686 #if defined(__linux__)
687 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
688 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
689 printf(_("Error: Could not bind socket to interface %s. Check your privileges...\n"),network_interface_name);
690 exit(STATE_UNKNOWN);
691 }
693 #else
694 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
695 #endif
697 /* bind the socket */
698 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
699 printf(_("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n"),DHCP_CLIENT_PORT);
700 exit(STATE_UNKNOWN);
701 }
703 return sock;
704 }
707 /* closes DHCP socket */
708 int close_dhcp_socket(int sock){
710 close(sock);
712 return OK;
713 }
716 /* adds a requested server address to list in memory */
717 int add_requested_server(struct in_addr server_address){
718 requested_server *new_server;
720 new_server=(requested_server *)malloc(sizeof(requested_server));
721 if(new_server==NULL)
722 return ERROR;
724 new_server->server_address=server_address;
726 new_server->next=requested_server_list;
727 requested_server_list=new_server;
729 requested_servers++;
731 if (verbose)
732 printf(_("Requested server address: %s\n"),inet_ntoa(new_server->server_address));
734 return OK;
735 }
740 /* adds a DHCP OFFER to list in memory */
741 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
742 dhcp_offer *new_offer;
743 int x;
744 int y;
745 unsigned option_type;
746 unsigned option_length;
748 if(offer_packet==NULL)
749 return ERROR;
751 /* process all DHCP options present in the packet */
752 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
754 /* end of options (0 is really just a pad, but bail out anyway) */
755 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
756 break;
758 /* get option type */
759 option_type=offer_packet->options[x++];
761 /* get option length */
762 option_length=offer_packet->options[x++];
764 if (verbose)
765 printf("Option: %d (0x%02X)\n",option_type,option_length);
767 /* get option data */
768 if(option_type==DHCP_OPTION_LEASE_TIME) {
769 memcpy(&dhcp_lease_time, &offer_packet->options[x],
770 sizeof(dhcp_lease_time));
771 dhcp_lease_time = ntohl(dhcp_lease_time);
772 }
773 if(option_type==DHCP_OPTION_RENEWAL_TIME) {
774 memcpy(&dhcp_renewal_time, &offer_packet->options[x],
775 sizeof(dhcp_renewal_time));
776 dhcp_renewal_time = ntohl(dhcp_renewal_time);
777 }
778 if(option_type==DHCP_OPTION_REBINDING_TIME) {
779 memcpy(&dhcp_rebinding_time, &offer_packet->options[x],
780 sizeof(dhcp_rebinding_time));
781 dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
782 }
784 /* skip option data we're ignoring */
785 else
786 for(y=0;y<option_length;y++,x++);
787 }
789 if (verbose) {
790 if(dhcp_lease_time==DHCP_INFINITE_TIME)
791 printf(_("Lease Time: Infinite\n"));
792 else
793 printf(_("Lease Time: %lu seconds\n"),(unsigned long)dhcp_lease_time);
794 if(dhcp_renewal_time==DHCP_INFINITE_TIME)
795 printf(_("Renewal Time: Infinite\n"));
796 else
797 printf(_("Renewal Time: %lu seconds\n"),(unsigned long)dhcp_renewal_time);
798 if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
799 printf(_("Rebinding Time: Infinite\n"));
800 printf(_("Rebinding Time: %lu seconds\n"),(unsigned long)dhcp_rebinding_time);
801 }
803 new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
805 if(new_offer==NULL)
806 return ERROR;
808 new_offer->server_address=source;
809 new_offer->offered_address=offer_packet->yiaddr;
810 new_offer->lease_time=dhcp_lease_time;
811 new_offer->renewal_time=dhcp_renewal_time;
812 new_offer->rebinding_time=dhcp_rebinding_time;
815 if (verbose) {
816 printf(_("Added offer from server @ %s"),inet_ntoa(new_offer->server_address));
817 printf(_(" of IP address %s\n"),inet_ntoa(new_offer->offered_address));
818 }
820 /* add new offer to head of list */
821 new_offer->next=dhcp_offer_list;
822 dhcp_offer_list=new_offer;
824 return OK;
825 }
828 /* frees memory allocated to DHCP OFFER list */
829 int free_dhcp_offer_list(void){
830 dhcp_offer *this_offer;
831 dhcp_offer *next_offer;
833 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
834 next_offer=this_offer->next;
835 free(this_offer);
836 }
838 return OK;
839 }
842 /* frees memory allocated to requested server list */
843 int free_requested_server_list(void){
844 requested_server *this_server;
845 requested_server *next_server;
847 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
848 next_server=this_server->next;
849 free(this_server);
850 }
852 return OK;
853 }
856 /* gets state and plugin output to return */
857 int get_results(void){
858 dhcp_offer *temp_offer;
859 requested_server *temp_server;
860 int result;
861 u_int32_t max_lease_time=0;
863 received_requested_address=FALSE;
865 /* checks responses from requested servers */
866 requested_responses=0;
867 if(requested_servers>0){
869 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
871 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
873 /* get max lease time we were offered */
874 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
875 max_lease_time=temp_offer->lease_time;
877 /* see if we got the address we requested */
878 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
879 received_requested_address=TRUE;
881 /* see if the servers we wanted a response from talked to us or not */
882 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
883 if (verbose) {
884 printf(_("DHCP Server Match: Offerer=%s"),inet_ntoa(temp_offer->server_address));
885 printf(_(" Requested=%s\n"),inet_ntoa(temp_server->server_address));
886 }
887 requested_responses++;
888 }
889 }
890 }
892 }
894 /* else check and see if we got our requested address from any server */
895 else{
897 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
899 /* get max lease time we were offered */
900 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
901 max_lease_time=temp_offer->lease_time;
903 /* see if we got the address we requested */
904 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
905 received_requested_address=TRUE;
906 }
907 }
909 result=STATE_OK;
910 if(valid_responses==0)
911 result=STATE_CRITICAL;
912 else if(requested_servers>0 && requested_responses==0)
913 result=STATE_CRITICAL;
914 else if(requested_responses<requested_servers)
915 result=STATE_WARNING;
916 else if(request_specific_address==TRUE && received_requested_address==FALSE)
917 result=STATE_WARNING;
919 if(result==0) /* garrett honeycutt 2005 */
920 printf("OK: ");
921 else if(result==1)
922 printf("WARNING: ");
923 else if(result==2)
924 printf("CRITICAL: ");
925 else if(result==3)
926 printf("UNKNOWN: ");
928 /* we didn't receive any DHCPOFFERs */
929 if(dhcp_offer_list==NULL){
930 printf(_("No DHCPOFFERs were received.\n"));
931 return result;
932 }
934 printf(_("Received %d DHCPOFFER(s)"),valid_responses);
936 if(requested_servers>0)
937 printf(_(", %s%d of %d requested servers responded"),((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
939 if(request_specific_address==TRUE)
940 printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address==TRUE)?"":_("not "));
942 printf(_(", max lease time = "));
943 if(max_lease_time==DHCP_INFINITE_TIME)
944 printf(_("Infinity"));
945 else
946 printf("%lu sec",(unsigned long)max_lease_time);
948 printf(".\n");
950 return result;
951 }
954 /* process command-line arguments */
955 int process_arguments(int argc, char **argv){
956 int c;
958 if(argc<1)
959 return ERROR;
961 c=0;
962 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
964 /*
965 if(is_option(argv[c]))
966 continue;
967 */
968 }
970 return validate_arguments();
971 }
975 int call_getopt(int argc, char **argv){
976 int c=0;
977 int i=0;
978 struct in_addr ipaddress;
980 int option_index = 0;
981 static struct option long_options[] =
982 {
983 {"serverip", required_argument,0,'s'},
984 {"requestedip", required_argument,0,'r'},
985 {"timeout", required_argument,0,'t'},
986 {"interface", required_argument,0,'i'},
987 {"verbose", no_argument, 0,'v'},
988 {"version", no_argument, 0,'V'},
989 {"help", no_argument, 0,'h'},
990 {0,0,0,0}
991 };
993 while(1){
994 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
996 i++;
998 if(c==-1||c==EOF||c==1)
999 break;
1001 switch(c){
1002 case 'w':
1003 case 'r':
1004 case 't':
1005 case 'i':
1006 i++;
1007 break;
1008 default:
1009 break;
1010 }
1012 switch(c){
1014 case 's': /* DHCP server address */
1015 if(inet_aton(optarg,&ipaddress))
1016 add_requested_server(ipaddress);
1017 /*
1018 else
1019 usage("Invalid server IP address\n");
1020 */
1021 break;
1023 case 'r': /* address we are requested from DHCP servers */
1024 if(inet_aton(optarg,&ipaddress)){
1025 requested_address=ipaddress;
1026 request_specific_address=TRUE;
1027 }
1028 /*
1029 else
1030 usage("Invalid requested IP address\n");
1031 */
1032 break;
1034 case 't': /* timeout */
1036 /*
1037 if(is_intnonneg(optarg))
1038 */
1039 if(atoi(optarg)>0)
1040 dhcpoffer_timeout=atoi(optarg);
1041 /*
1042 else
1043 usage("Time interval must be a nonnegative integer\n");
1044 */
1045 break;
1047 case 'i': /* interface name */
1049 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1050 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1052 break;
1054 case 'V': /* version */
1055 print_revision(progname,revision);
1056 exit(STATE_OK);
1058 case 'h': /* help */
1059 print_help();
1060 exit(STATE_OK);
1062 case 'v': /* verbose */
1063 verbose=1;
1064 break;
1066 case '?': /* help */
1067 usage2 (_("Unknown argument"), optarg);
1068 break;
1070 default:
1071 break;
1072 }
1073 }
1075 return i;
1076 }
1079 int validate_arguments(void){
1081 return OK;
1082 }
1084 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1086 /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
1088 /* get a message from a stream; return type of message */
1089 static int get_msg(int fd)
1090 {
1091 int flags = 0;
1092 int res, ret;
1093 ctl_area[0] = 0;
1094 dat_area[0] = 0;
1095 ret = 0;
1096 res = getmsg(fd, &ctl, &dat, &flags);
1098 if(res < 0) {
1099 if(errno == EINTR) {
1100 return(GOT_INTR);
1101 } else {
1102 printf("%s\n", "get_msg FAILED.");
1103 return(GOT_ERR);
1104 }
1105 }
1106 if(ctl.len > 0) {
1107 ret |= GOT_CTRL;
1108 }
1109 if(dat.len > 0) {
1110 ret |= GOT_DATA;
1111 }
1112 return(ret);
1113 }
1115 /* verify that dl_primitive in ctl_area = prim */
1116 static int check_ctrl(int prim)
1117 {
1118 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1119 if(err_ack->dl_primitive != prim) {
1120 printf(_("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n"), strerror(errno));
1121 exit(STATE_UNKNOWN);
1122 }
1123 return 0;
1124 }
1126 /* put a control message on a stream */
1127 static int put_ctrl(int fd, int len, int pri)
1128 {
1129 ctl.len = len;
1130 if(putmsg(fd, &ctl, 0, pri) < 0) {
1131 printf(_("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n"), strerror(errno));
1132 exit(STATE_UNKNOWN);
1133 }
1134 return 0;
1135 }
1137 /* put a control + data message on a stream */
1138 static int put_both(int fd, int clen, int dlen, int pri)
1139 {
1140 ctl.len = clen;
1141 dat.len = dlen;
1142 if(putmsg(fd, &ctl, &dat, pri) < 0) {
1143 printf(_("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n"), strerror(errno));
1144 exit(STATE_UNKNOWN);
1145 }
1146 return 0;
1147 }
1149 /* open file descriptor and attach */
1150 static int dl_open(const char *dev, int unit, int *fd)
1151 {
1152 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1153 if((*fd = open(dev, O_RDWR)) == -1) {
1154 printf(_("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n"), dev, strerror(errno));
1155 exit(STATE_UNKNOWN);
1156 }
1157 attach_req->dl_primitive = DL_ATTACH_REQ;
1158 attach_req->dl_ppa = unit;
1159 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1160 get_msg(*fd);
1161 return check_ctrl(DL_OK_ACK);
1162 }
1164 /* send DL_BIND_REQ */
1165 static int dl_bind(int fd, int sap, u_char *addr)
1166 {
1167 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1168 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1169 bind_req->dl_primitive = DL_BIND_REQ;
1170 bind_req->dl_sap = sap;
1171 bind_req->dl_max_conind = 1;
1172 bind_req->dl_service_mode = DL_CLDLS;
1173 bind_req->dl_conn_mgmt = 0;
1174 bind_req->dl_xidtest_flg = 0;
1175 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1176 get_msg(fd);
1177 if (GOT_ERR == check_ctrl(DL_BIND_ACK)) {
1178 printf(_("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n"), strerror(errno));
1179 exit(STATE_UNKNOWN);
1180 }
1181 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1182 bind_ack->dl_addr_length);
1183 return 0;
1184 }
1186 /***********************************************************************
1187 * interface:
1188 * function mac_addr_dlpi - get the mac address of the interface with
1189 * type dev (eg lnc, hme) and unit (0, 1 ..)
1190 *
1191 * parameter: addr: an array of six bytes, has to be allocated by the caller
1192 *
1193 * return: 0 if OK, -1 if the address could not be determined
1194 *
1195 *
1196 ***********************************************************************/
1198 long mac_addr_dlpi( const char *dev, int unit, u_char *addr) {
1200 int fd;
1201 u_char mac_addr[25];
1203 if (GOT_ERR != dl_open(dev, unit, &fd)) {
1204 if (GOT_ERR != dl_bind(fd, INSAP, mac_addr)) {
1205 bcopy( mac_addr, addr, 6);
1206 return 0;
1207 }
1208 }
1209 close(fd);
1210 return -1;
1211 }
1213 /* Kompf 2000-2003 */
1215 #endif
1218 /* print usage help */
1219 void print_help(void){
1221 print_revision(progname,revision);
1223 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n");
1224 printf (COPYRIGHT, copyright, email);
1226 printf(_("This plugin tests the availability of DHCP servers on a network.\n\n"));
1228 print_usage();
1230 printf (_(UT_HELP_VRSN));
1232 printf (_(UT_VERBOSE));
1234 printf(_("\
1235 -s, --serverip=IPADDRESS\n\
1236 IP address of DHCP server that we must hear from\n\
1237 -r, --requestedip=IPADDRESS\n\
1238 IP address that should be offered by at least one DHCP server\n\
1239 -t, --timeout=INTEGER\n\
1240 Seconds to wait for DHCPOFFER before timeout occurs\n\
1241 -i, --interface=STRING\n\
1242 Interface to to use for listening (i.e. eth0)\n"));
1243 }
1246 void print_usage(void)
1247 {
1248 printf("\
1249 Usage: %s [-s serverip] [-r requestedip] [-t timeout] [-i interface] [-v]\n",progname);
1250 }