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 *****************************************************************************/
27 #include "common.h"
28 #include "netutils.h"
29 #include "utils.h"
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <errno.h>
35 #include <unistd.h>
36 #include <sys/time.h>
37 #include <sys/ioctl.h>
38 #include <fcntl.h>
39 #include <getopt.h>
40 #include <sys/socket.h>
41 #include <sys/types.h>
42 #include <netdb.h>
43 #include <netinet/in.h>
44 #include <net/if.h>
45 #include <arpa/inet.h>
47 #if defined( __linux__ )
49 #include <linux/if_ether.h>
50 #include <features.h>
52 #elif defined (__bsd__)
54 #include <netinet/if_ether.h>
55 #include <sys/sysctl.h>
56 #include <net/if_dl.h>
58 #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
60 #define INSAP 22
61 #define OUTSAP 24
63 #include <signal.h>
64 #include <ctype.h>
65 #include <sys/stropts.h>
66 #include <sys/poll.h>
67 #include <sys/dlpi.h>
69 #define bcopy(source, destination, length) memcpy(destination, source, length)
71 #define AREA_SZ 5000 /* buffer length in bytes */
72 static u_long ctl_area[AREA_SZ];
73 static u_long dat_area[AREA_SZ];
74 static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
75 static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
77 #define GOT_CTRL 1
78 #define GOT_DATA 2
79 #define GOT_BOTH 3
80 #define GOT_INTR 4
81 #define GOT_ERR 128
83 #define u_int8_t uint8_t
84 #define u_int16_t uint16_t
85 #define u_int32_t uint32_t
87 static int get_msg(int);
88 static int check_ctrl(int);
89 static int put_ctrl(int, int, int);
90 static int put_both(int, int, int, int);
91 static int dl_open(const char *, int, int *);
92 static int dl_bind(int, int, u_char *);
93 long mac_addr_dlpi( const char *, int, u_char *);
95 #endif
97 const char *progname = "check_dhcp";
99 #define HAVE_GETOPT_H
102 /**** Common definitions ****/
104 #define STATE_OK 0
105 #define STATE_WARNING 1
106 #define STATE_CRITICAL 2
107 #define STATE_UNKNOWN -1
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[8]="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;
241 if(process_arguments(argc,argv)!=OK){
242 /*usage("Invalid command arguments supplied\n");*/
243 printf("Invalid command arguments supplied\n");
244 exit(STATE_UNKNOWN);
245 }
248 /* create socket for DHCP communications */
249 dhcp_socket=create_dhcp_socket();
251 /* get hardware address of client machine */
252 get_hardware_address(dhcp_socket,network_interface_name);
254 /* send DHCPDISCOVER packet */
255 send_dhcp_discover(dhcp_socket);
257 /* wait for a DHCPOFFER packet */
258 get_dhcp_offer(dhcp_socket);
260 /* close socket we created */
261 close_dhcp_socket(dhcp_socket);
263 /* determine state/plugin output to return */
264 result=get_results();
266 /* free allocated memory */
267 free_dhcp_offer_list();
268 free_requested_server_list();
270 return result;
271 }
275 /* determines hardware address on client machine */
276 int get_hardware_address(int sock,char *interface_name){
278 int i;
280 #if defined(__linux__)
281 struct ifreq ifr;
283 strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
285 /* try and grab hardware address of requested interface */
286 if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
287 printf("Error: Could not get hardware address of interface '%s'\n",interface_name);
288 exit(STATE_UNKNOWN);
289 }
291 memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
293 #elif defined(__bsd__)
295 /* Code from getmac.c posted at http://lists.freebsd.org/pipermail/freebsd-hackers/2004-June/007415.html
296 * by Alecs King based on Unix Network programming Ch 17
297 */
299 int mib[6], len;
300 char *buf;
301 unsigned char *ptr;
302 struct if_msghdr *ifm;
303 struct sockaddr_dl *sdl;
305 mib[0] = CTL_NET;
306 mib[1] = AF_ROUTE;
307 mib[2] = 0;
308 mib[3] = AF_LINK;
309 mib[4] = NET_RT_IFLIST;
311 if ((mib[5] = if_nametoindex(interface_name)) == 0) {
312 printf("Error: if_nametoindex error - %s.\n", strerror(errno));
313 exit(STATE_UNKNOWN);
314 }
316 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
317 printf("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n", interface_name, strerror(errno));
318 exit(STATE_UNKNOWN);
319 }
321 if ((buf = malloc(len)) == NULL) {
322 printf("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n", interface_name, strerror(errno));
323 exit(4);
324 }
326 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
327 printf("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n", interface_name, strerror(errno));
328 exit(STATE_UNKNOWN);
329 }
331 ifm = (struct if_msghdr *)buf;
332 sdl = (struct sockaddr_dl *)(ifm + 1);
333 ptr = (unsigned char *)LLADDR(sdl);
334 memcpy(&client_hardware_address[0], ptr, 6) ;
336 #elif defined(__sun__) || defined(__solaris__)
338 /*
339 * Lifted from
340 *
341 * mac_addr_dlpi.c
342 *
343 * Copyright @2000, 2003 Martin Kompf, martin@kompf.de
344 *
345 * Return the MAC (ie, ethernet hardware) address by using the dlpi api.
346 *
347 */
349 long stat;
350 char dev[20] = "/dev/";
351 char *p;
352 int unit;
354 for (p = interface_name; *p && isalpha(*p); p++)
355 /* no-op */ ;
356 if ( p != '\0' ) {
357 unit = atoi(p) ;
358 *p = '\0' ;
359 strncat(dev, interface_name, 6) ;
360 } else {
361 printf("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n", interface_name);
362 exit(STATE_UNKNOWN);
363 }
364 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
365 if (stat != 0) {
366 printf("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n", dev, unit);
367 exit(STATE_UNKNOWN);
368 }
370 #elif defined(__hpux__)
372 /* Martin Kompf again
373 *
374 * Nagios plugins thank you sincerely
375 */
377 long stat;
378 char dev[20] = "/dev/dlpi" ;
379 int unit = 0;
381 stat = mac_addr_dlpi(dev, unit, client_hardware_address);
382 if (stat != 0) {
383 printf("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n", dev, unit);
384 exit(STATE_UNKNOWN);
385 }
387 #else
388 printf("Error: can't get MAC address for this architecture.\n");
389 exit(STATE_UNKNOWN);
390 #endif
392 if (verbose) {
393 printf( "Hardware address: ");
394 for (i=0; i<6; ++i)
395 printf("%2.2x", client_hardware_address[i]);
396 printf( "\n");
397 }
399 return OK;
400 }
403 /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
404 int send_dhcp_discover(int sock){
405 dhcp_packet discover_packet;
406 struct sockaddr_in sockaddr_broadcast;
409 /* clear the packet data structure */
410 bzero(&discover_packet,sizeof(discover_packet));
413 /* boot request flag (backward compatible with BOOTP servers) */
414 discover_packet.op=BOOTREQUEST;
416 /* hardware address type */
417 discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
419 /* length of our hardware address */
420 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
422 discover_packet.hops=0;
424 /* transaction id is supposed to be random */
425 srand(time(NULL));
426 packet_xid=random();
427 discover_packet.xid=htonl(packet_xid);
429 /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
430 /* downright bizzarre... */
431 ntohl(discover_packet.xid);
433 /*discover_packet.secs=htons(65535);*/
434 discover_packet.secs=0xFF;
436 /* tell server it should broadcast its response */
437 discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
439 /* our hardware address */
440 memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
442 /* first four bytes of options field is magic cookie (as per RFC 2132) */
443 discover_packet.options[0]='\x63';
444 discover_packet.options[1]='\x82';
445 discover_packet.options[2]='\x53';
446 discover_packet.options[3]='\x63';
448 /* DHCP message type is embedded in options field */
449 discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
450 discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
451 discover_packet.options[6]=DHCPDISCOVER;
453 /* the IP address we're requesting */
454 if(request_specific_address==TRUE){
455 discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
456 discover_packet.options[8]='\x04';
457 memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
458 }
460 /* send the DHCPDISCOVER packet to broadcast address */
461 sockaddr_broadcast.sin_family=AF_INET;
462 sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
463 sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
464 bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
467 if (verbose) {
468 printf("DHCPDISCOVER to %s port %d\n",inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
469 printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
470 printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
471 printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
472 printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
473 printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
474 }
476 /* send the DHCPDISCOVER packet out */
477 send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
479 if (verbose)
480 printf("\n\n");
482 return OK;
483 }
488 /* waits for a DHCPOFFER message from one or more DHCP servers */
489 int get_dhcp_offer(int sock){
490 dhcp_packet offer_packet;
491 struct sockaddr_in source;
492 int result=OK;
493 int timeout=1;
494 int responses=0;
495 int x;
496 time_t start_time;
497 time_t current_time;
499 time(&start_time);
501 /* receive as many responses as we can */
502 for(responses=0,valid_responses=0;;){
504 time(¤t_time);
505 if((current_time-start_time)>=dhcpoffer_timeout)
506 break;
508 if (verbose)
509 printf("\n\n");
511 bzero(&source,sizeof(source));
512 bzero(&offer_packet,sizeof(offer_packet));
514 result=OK;
515 result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
517 if(result!=OK){
518 if (verbose)
519 printf("Result=ERROR\n");
521 continue;
522 }
523 else{
524 if (verbose)
525 printf("Result=OK\n");
527 responses++;
528 }
530 if (verbose) {
531 printf("DHCPOFFER from IP address %s\n",inet_ntoa(source.sin_addr));
532 printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
533 }
535 /* check packet xid to see if its the same as the one we used in the discover packet */
536 if(ntohl(offer_packet.xid)!=packet_xid){
537 if (verbose)
538 printf("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n",ntohl(offer_packet.xid),packet_xid);
540 continue;
541 }
543 /* check hardware address */
544 result=OK;
545 if (verbose)
546 printf("DHCPOFFER chaddr: ");
548 for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
549 if (verbose)
550 printf("%02X",(unsigned char)offer_packet.chaddr[x]);
552 if(offer_packet.chaddr[x]!=client_hardware_address[x])
553 result=ERROR;
554 }
555 if (verbose)
556 printf("\n");
558 if(result==ERROR){
559 if (verbose)
560 printf("DHCPOFFER hardware address did not match our own - ignoring packet\n");
562 continue;
563 }
565 if (verbose) {
566 printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
567 printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
568 printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
569 printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
570 }
572 add_dhcp_offer(source.sin_addr,&offer_packet);
574 valid_responses++;
575 }
577 if (verbose) {
578 printf("Total responses seen on the wire: %d\n",responses);
579 printf("Valid responses for this machine: %d\n",valid_responses);
580 }
582 return OK;
583 }
587 /* sends a DHCP packet */
588 int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
589 struct sockaddr_in myname;
590 int result;
592 result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
594 if (verbose)
595 printf("send_dhcp_packet result: %d\n",result);
597 if(result<0)
598 return ERROR;
600 return OK;
601 }
605 /* receives a DHCP packet */
606 int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
607 struct timeval tv;
608 fd_set readfds;
609 int recv_result;
610 socklen_t address_size;
611 struct sockaddr_in source_address;
614 /* wait for data to arrive (up time timeout) */
615 tv.tv_sec=timeout;
616 tv.tv_usec=0;
617 FD_ZERO(&readfds);
618 FD_SET(sock,&readfds);
619 select(sock+1,&readfds,NULL,NULL,&tv);
621 /* make sure some data has arrived */
622 if(!FD_ISSET(sock,&readfds)){
623 if (verbose)
624 printf("No (more) data received\n");
625 return ERROR;
626 }
628 else{
630 /* 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
631 not being interpreted correctly. sigh... */
632 bzero(&source_address,sizeof(source_address));
633 address_size=sizeof(source_address);
634 recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
635 if (verbose)
636 printf("recv_result_1: %d\n",recv_result);
637 recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
638 if (verbose)
639 printf("recv_result_2: %d\n",recv_result);
641 if(recv_result==-1){
642 if (verbose) {
643 printf("recvfrom() failed, ");
644 printf("errno: (%d) -> %s\n",errno,strerror(errno));
645 }
646 return ERROR;
647 }
648 else{
649 if (verbose) {
650 printf("receive_dhcp_packet() result: %d\n",recv_result);
651 printf("receive_dhcp_packet() source: %s\n",inet_ntoa(source_address.sin_addr));
652 }
654 memcpy(address,&source_address,sizeof(source_address));
655 return OK;
656 }
657 }
659 return OK;
660 }
664 /* creates a socket for DHCP communication */
665 int create_dhcp_socket(void){
666 struct sockaddr_in myname;
667 struct ifreq interface;
668 int sock;
669 int flag=1;
671 /* Set up the address we're going to bind to. */
672 bzero(&myname,sizeof(myname));
673 myname.sin_family=AF_INET;
674 myname.sin_port=htons(DHCP_CLIENT_PORT);
675 myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
676 bzero(&myname.sin_zero,sizeof(myname.sin_zero));
678 /* create a socket for DHCP communications */
679 sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
680 if(sock<0){
681 printf("Error: Could not create socket!\n");
682 exit(STATE_UNKNOWN);
683 }
685 if (verbose)
686 printf("DHCP socket: %d\n",sock);
688 /* set the reuse address flag so we don't get errors when restarting */
689 flag=1;
690 if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
691 printf("Error: Could not set reuse address option on DHCP socket!\n");
692 exit(STATE_UNKNOWN);
693 }
695 /* set the broadcast option - we need this to listen to DHCP broadcast messages */
696 if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
697 printf("Error: Could not set broadcast option on DHCP socket!\n");
698 exit(STATE_UNKNOWN);
699 }
701 /* bind socket to interface */
702 #if defined(__linux__)
703 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
704 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
705 printf("Error: Could not bind socket to interface %s. Check your privileges...\n",network_interface_name);
706 exit(STATE_UNKNOWN);
707 }
709 #else
710 strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
711 #endif
713 /* bind the socket */
714 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
715 printf("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n",DHCP_CLIENT_PORT);
716 exit(STATE_UNKNOWN);
717 }
719 return sock;
720 }
726 /* closes DHCP socket */
727 int close_dhcp_socket(int sock){
729 close(sock);
731 return OK;
732 }
737 /* adds a requested server address to list in memory */
738 int add_requested_server(struct in_addr server_address){
739 requested_server *new_server;
741 new_server=(requested_server *)malloc(sizeof(requested_server));
742 if(new_server==NULL)
743 return ERROR;
745 new_server->server_address=server_address;
747 new_server->next=requested_server_list;
748 requested_server_list=new_server;
750 requested_servers++;
752 if (verbose)
753 printf("Requested server address: %s\n",inet_ntoa(new_server->server_address));
755 return OK;
756 }
761 /* adds a DHCP OFFER to list in memory */
762 int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
763 dhcp_offer *new_offer;
764 int x;
765 int y;
766 unsigned option_type;
767 unsigned option_length;
769 if(offer_packet==NULL)
770 return ERROR;
772 /* process all DHCP options present in the packet */
773 for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
775 /* end of options (0 is really just a pad, but bail out anyway) */
776 if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
777 break;
779 /* get option type */
780 option_type=offer_packet->options[x++];
782 /* get option length */
783 option_length=offer_packet->options[x++];
785 if (verbose)
786 printf("Option: %d (0x%02X)\n",option_type,option_length);
788 /* get option data */
789 if(option_type==DHCP_OPTION_LEASE_TIME)
790 dhcp_lease_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
791 if(option_type==DHCP_OPTION_RENEWAL_TIME)
792 dhcp_renewal_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
793 if(option_type==DHCP_OPTION_REBINDING_TIME)
794 dhcp_rebinding_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
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;
821 new_offer->server_address=source;
822 new_offer->offered_address=offer_packet->yiaddr;
823 new_offer->lease_time=dhcp_lease_time;
824 new_offer->renewal_time=dhcp_renewal_time;
825 new_offer->rebinding_time=dhcp_rebinding_time;
828 if (verbose) {
829 printf("Added offer from server @ %s",inet_ntoa(new_offer->server_address));
830 printf(" of IP address %s\n",inet_ntoa(new_offer->offered_address));
831 }
833 /* add new offer to head of list */
834 new_offer->next=dhcp_offer_list;
835 dhcp_offer_list=new_offer;
837 return OK;
838 }
843 /* frees memory allocated to DHCP OFFER list */
844 int free_dhcp_offer_list(void){
845 dhcp_offer *this_offer;
846 dhcp_offer *next_offer;
848 for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
849 next_offer=this_offer->next;
850 free(this_offer);
851 }
853 return OK;
854 }
859 /* frees memory allocated to requested server list */
860 int free_requested_server_list(void){
861 requested_server *this_server;
862 requested_server *next_server;
864 for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
865 next_server=this_server->next;
866 free(this_server);
867 }
869 return OK;
870 }
873 /* gets state and plugin output to return */
874 int get_results(void){
875 dhcp_offer *temp_offer;
876 requested_server *temp_server;
877 int result;
878 u_int32_t max_lease_time=0;
880 received_requested_address=FALSE;
882 /* checks responses from requested servers */
883 requested_responses=0;
884 if(requested_servers>0){
886 for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
888 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
890 /* get max lease time we were offered */
891 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
892 max_lease_time=temp_offer->lease_time;
894 /* see if we got the address we requested */
895 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
896 received_requested_address=TRUE;
898 /* see if the servers we wanted a response from talked to us or not */
899 if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
900 if (verbose) {
901 printf("DHCP Server Match: Offerer=%s",inet_ntoa(temp_offer->server_address));
902 printf(" Requested=%s\n",inet_ntoa(temp_server->server_address));
903 }
904 requested_responses++;
905 }
906 }
907 }
909 }
911 /* else check and see if we got our requested address from any server */
912 else{
914 for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
916 /* get max lease time we were offered */
917 if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
918 max_lease_time=temp_offer->lease_time;
920 /* see if we got the address we requested */
921 if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
922 received_requested_address=TRUE;
923 }
924 }
926 result=STATE_OK;
927 if(valid_responses==0)
928 result=STATE_CRITICAL;
929 else if(requested_servers>0 && requested_responses==0)
930 result=STATE_CRITICAL;
931 else if(requested_responses<requested_servers)
932 result=STATE_WARNING;
933 else if(request_specific_address==TRUE && received_requested_address==FALSE)
934 result=STATE_WARNING;
937 printf("DHCP %s: ",(result==STATE_OK)?"ok":"problem");
939 /* we didn't receive any DHCPOFFERs */
940 if(dhcp_offer_list==NULL){
941 printf("No DHCPOFFERs were received.\n");
942 return result;
943 }
945 printf("Received %d DHCPOFFER(s)",valid_responses);
947 if(requested_servers>0)
948 printf(", %s%d of %d requested servers responded",((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
950 if(request_specific_address==TRUE)
951 printf(", requested address (%s) was %soffered",inet_ntoa(requested_address),(received_requested_address==TRUE)?"":"not ");
953 printf(", max lease time = ");
954 if(max_lease_time==DHCP_INFINITE_TIME)
955 printf("Infinity");
956 else
957 printf("%lu sec",(unsigned long)max_lease_time);
959 printf(".\n");
961 return result;
962 }
969 /* print usage help */
970 void print_help(void){
972 /*print_revision(progname,"$Revision$");*/
974 printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n\n");
975 printf("This plugin tests the availability of DHCP servers on a network.\n\n");
977 print_usage();
979 printf
980 ("\nOptions:\n"
981 " -s, --serverip=IPADDRESS\n"
982 " IP address of DHCP server that we must hear from\n"
983 " -r, --requestedip=IPADDRESS\n"
984 " IP address that should be offered by at least one DHCP server\n"
985 " -t, --timeout=INTEGER\n"
986 " Seconds to wait for DHCPOFFER before timeout occurs\n"
987 " -i, --interface=STRING\n"
988 " Interface to to use for listening (i.e. eth0)\n"
989 " -v, --verbose\n"
990 " Print extra information (command-line use only)\n"
991 " -h, --help\n"
992 " Print detailed help screen\n"
993 " -V, --version\n"
994 " Print version information\n\n"
995 );
997 /*support();*/
999 return;
1000 }
1003 /* prints usage information */
1004 void print_usage(void){
1006 printf("Usage: %s [-s serverip] [-r requestedip] [-t timeout] [-i interface]\n",progname);
1007 printf(" %s --help\n",progname);
1008 printf(" %s --version\n",progname);
1010 return;
1011 }
1016 /* process command-line arguments */
1017 int process_arguments(int argc, char **argv){
1018 int c;
1020 if(argc<1)
1021 return ERROR;
1023 c=0;
1024 while((c+=(call_getopt(argc-c,&argv[c])))<argc){
1026 /*
1027 if(is_option(argv[c]))
1028 continue;
1029 */
1030 }
1032 return validate_arguments();
1033 }
1037 int call_getopt(int argc, char **argv){
1038 int c=0;
1039 int i=0;
1040 struct in_addr ipaddress;
1042 #ifdef HAVE_GETOPT_H
1043 int option_index = 0;
1044 static struct option long_options[] =
1045 {
1046 {"serverip", required_argument,0,'s'},
1047 {"requestedip", required_argument,0,'r'},
1048 {"timeout", required_argument,0,'t'},
1049 {"interface", required_argument,0,'i'},
1050 {"verbose", no_argument, 0,'v'},
1051 {"version", no_argument, 0,'V'},
1052 {"help", no_argument, 0,'h'},
1053 {0,0,0,0}
1054 };
1055 #endif
1057 while(1){
1058 #ifdef HAVE_GETOPT_H
1059 c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
1060 #else
1061 c=getopt(argc,argv,"+?hVvt:s:r:t:i:");
1062 #endif
1064 i++;
1066 if(c==-1||c==EOF||c==1)
1067 break;
1069 switch(c){
1070 case 'w':
1071 case 'r':
1072 case 't':
1073 case 'i':
1074 i++;
1075 break;
1076 default:
1077 break;
1078 }
1080 switch(c){
1082 case 's': /* DHCP server address */
1083 if(inet_aton(optarg,&ipaddress))
1084 add_requested_server(ipaddress);
1085 /*
1086 else
1087 usage("Invalid server IP address\n");
1088 */
1089 break;
1091 case 'r': /* address we are requested from DHCP servers */
1092 if(inet_aton(optarg,&ipaddress)){
1093 requested_address=ipaddress;
1094 request_specific_address=TRUE;
1095 }
1096 /*
1097 else
1098 usage("Invalid requested IP address\n");
1099 */
1100 break;
1102 case 't': /* timeout */
1104 /*
1105 if(is_intnonneg(optarg))
1106 */
1107 if(atoi(optarg)>0)
1108 dhcpoffer_timeout=atoi(optarg);
1109 /*
1110 else
1111 usage("Time interval must be a nonnegative integer\n");
1112 */
1113 break;
1115 case 'i': /* interface name */
1117 strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
1118 network_interface_name[sizeof(network_interface_name)-1]='\x0';
1120 break;
1122 case 'V': /* version */
1124 /*print_revision(progname,"$Revision$");*/
1125 exit(STATE_OK);
1127 case 'h': /* help */
1129 print_help();
1130 exit(STATE_OK);
1132 case 'v': /* verbose */
1134 verbose=1;
1135 break;
1137 case '?': /* help */
1139 /*usage("Invalid argument\n");*/
1140 break;
1142 default:
1143 break;
1144 }
1145 }
1147 return i;
1148 }
1152 int validate_arguments(void){
1154 return OK;
1155 }
1157 #if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
1160 /*
1161 * Copyright @2000, 2003 Martin Kompf, martin@kompf.de
1162 *
1163 * Nagios plugins thanks Martin for this code.
1164 */
1166 /* get a message from a stream; return type of message */
1167 static int get_msg(int fd)
1168 {
1169 int flags = 0;
1170 int res, ret;
1171 ctl_area[0] = 0;
1172 dat_area[0] = 0;
1173 ret = 0;
1174 res = getmsg(fd, &ctl, &dat, &flags);
1176 if(res < 0) {
1177 if(errno == EINTR) {
1178 return(GOT_INTR);
1179 } else {
1180 printf("%s\n", "get_msg FAILED.");
1181 return(GOT_ERR);
1182 }
1183 }
1184 if(ctl.len > 0) {
1185 ret |= GOT_CTRL;
1186 }
1187 if(dat.len > 0) {
1188 ret |= GOT_DATA;
1189 }
1190 return(ret);
1191 }
1193 /* verify that dl_primitive in ctl_area = prim */
1194 static int check_ctrl(int prim)
1195 {
1196 dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
1197 if(err_ack->dl_primitive != prim) {
1198 printf("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n", strerror(errno));
1199 exit(STATE_UNKNOWN);
1200 }
1201 return 0;
1202 }
1204 /* put a control message on a stream */
1205 static int put_ctrl(int fd, int len, int pri)
1206 {
1207 ctl.len = len;
1208 if(putmsg(fd, &ctl, 0, pri) < 0) {
1209 printf("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n", strerror(errno));
1210 exit(STATE_UNKNOWN);
1211 }
1212 return 0;
1213 }
1215 /* put a control + data message on a stream */
1216 static int put_both(int fd, int clen, int dlen, int pri)
1217 {
1218 ctl.len = clen;
1219 dat.len = dlen;
1220 if(putmsg(fd, &ctl, &dat, pri) < 0) {
1221 printf("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n", strerror(errno));
1222 exit(STATE_UNKNOWN);
1223 }
1224 return 0;
1225 }
1227 /* open file descriptor and attach */
1228 static int dl_open(const char *dev, int unit, int *fd)
1229 {
1230 dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
1231 if((*fd = open(dev, O_RDWR)) == -1) {
1232 printf("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n", dev, strerror(errno));
1233 exit(STATE_UNKNOWN);
1234 }
1235 attach_req->dl_primitive = DL_ATTACH_REQ;
1236 attach_req->dl_ppa = unit;
1237 put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
1238 get_msg(*fd);
1239 return check_ctrl(DL_OK_ACK);
1240 }
1242 /* send DL_BIND_REQ */
1243 static int dl_bind(int fd, int sap, u_char *addr)
1244 {
1245 dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
1246 dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
1247 bind_req->dl_primitive = DL_BIND_REQ;
1248 bind_req->dl_sap = sap;
1249 bind_req->dl_max_conind = 1;
1250 bind_req->dl_service_mode = DL_CLDLS;
1251 bind_req->dl_conn_mgmt = 0;
1252 bind_req->dl_xidtest_flg = 0;
1253 put_ctrl(fd, sizeof(dl_bind_req_t), 0);
1254 get_msg(fd);
1255 if (GOT_ERR == check_ctrl(DL_BIND_ACK)) {
1256 printf("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n", strerror(errno));
1257 exit(STATE_UNKNOWN);
1258 }
1259 bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
1260 bind_ack->dl_addr_length);
1261 return 0;
1262 }
1264 /***********************************************************************
1265 * interface:
1266 * function mac_addr_dlpi - get the mac address of the interface with
1267 * type dev (eg lnc, hme) and unit (0, 1 ..)
1268 *
1269 * parameter: addr: an array of six bytes, has to be allocated by the caller
1270 *
1271 * return: 0 if OK, -1 if the address could not be determined
1272 *
1273 *
1274 ***********************************************************************/
1276 long mac_addr_dlpi( const char *dev, int unit, u_char *addr) {
1278 int fd;
1279 u_char mac_addr[25];
1281 if (GOT_ERR != dl_open(dev, unit, &fd)) {
1282 if (GOT_ERR != dl_bind(fd, INSAP, mac_addr)) {
1283 bcopy( mac_addr, addr, 6);
1284 return 0;
1285 }
1286 }
1287 close(fd);
1288 return -1;
1289 }
1291 #endif