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raw | patch | inline | side by side (parent: 8ce197c)
raw | patch | inline | side by side (parent: 8ce197c)
| author | Stanley Hopcroft <stanleyhopcroft@users.sourceforge.net> | |
| Tue, 7 Dec 2004 02:33:17 +0000 (02:33 +0000) | ||
| committer | Stanley Hopcroft <stanleyhopcroft@users.sourceforge.net> | |
| Tue, 7 Dec 2004 02:33:17 +0000 (02:33 +0000) |
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1008 f882894a-f735-0410-b71e-b25c423dba1c
| plugins/Makefile.am | patch | blob | history | |
| plugins/check_dhcp.c | [new file with mode: 0644] | patch | blob |
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index b87154d06ac39f835c8133e8d298182ed7c1f771..33f7686a3e33f22af122ecf3f5a9e2efd40cc2c0 100644 (file)
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
DEFS = -DLOCALEDIR=\"$(localedir)\" @DEFS@
LIBS = @LIBINTL@ @LIBS@
-libexec_PROGRAMS = check_disk check_dummy check_http check_load \
+libexec_PROGRAMS = check_dhcp check_disk check_dummy check_http check_load \
check_mrtg check_mrtgtraf check_nwstat check_overcr check_ping \
check_real check_smtp check_ssh check_tcp check_time \
check_udp check_ups check_users negate urlize check_icmp \
##############################################################################
# the actual targets
+check_dhcp_LDADD = $(BASEOBJS)
check_dig_LDADD = $(NETLIBS) popen.o
check_disk_LDADD = $(BASEOBJS) popen.o
check_dns_LDADD = $(NETLIBS) popen.o
negate_LDADD = $(BASEOBJS) popen.o
urlize_LDADD = $(BASEOBJS) popen.o
+check_dhcp_DEPENDENCIES = check_dhcp.c $(DEPLIBS)
check_dig_DEPENDENCIES = check_dig.c $(NETOBJS) popen.o $(DEPLIBS)
check_disk_DEPENDENCIES = check_disk.c $(BASEOBJS) popen.o $(DEPLIBS)
check_dns_DEPENDENCIES = check_dns.c $(NETOBJS) popen.o $(DEPLIBS)
check_game_DEPENDENCIES = check_game.c $(DEPLIBS)
check_http_DEPENDENCIES = check_http.c $(NETOBJS) $(DEPLIBS)
check_hpjd_DEPENDENCIES = check_hpjd.c $(NETOBJS) popen.o $(DEPLIBS)
+check_icmp_DEPENDENCIES = check_icmp.c $(DEPLIBS)
+check_ide_smart_DEPENDENCIES = check_ide_smart.c $(BASEOBJS) $(DEPLIBS)
check_ldap_DEPENDENCIES = check_ldap.c $(NETOBJS) $(DEPLIBS)
check_load_DEPENDENCIES = check_load.c $(BASEOBJS) popen.o $(DEPLIBS)
check_mrtg_DEPENDENCIES = check_mrtg.c $(DEPLIBS)
check_ups_DEPENDENCIES = check_ups.c $(NETOBJS) $(DEPLIBS)
check_users_DEPENDENCIES = check_users.c $(BASEOBJS) popen.o $(DEPLIBS)
check_by_ssh_DEPENDENCIES = check_by_ssh.c $(NETOBJS) popen.o $(DEPLIBS)
-check_ide_smart_DEPENDENCIES = check_ide_smart.c $(BASEOBJS) $(DEPLIBS)
negate_DEPENDENCIES = negate.c $(BASEOBJS) popen.o $(DEPLIBS)
urlize_DEPENDENCIES = urlize.c $(BASEOBJS) popen.o $(DEPLIBS)
-check_icmp_DEPENDENCIES = check_icmp.c $(DEPLIBS)
##############################################################################
# secondary dependencies
diff --git a/plugins/check_dhcp.c b/plugins/check_dhcp.c
--- /dev/null
+++ b/plugins/check_dhcp.c
@@ -0,0 +1,1061 @@
+/******************************************************************************
+*
+* CHECK_DHCP.C
+*
+* Program: DHCP plugin for Nagios
+* License: GPL
+* Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
+*
+* License Information:
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+*****************************************************************************/
+
+#include "common.h"
+#include "netutils.h"
+#include "utils.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+
+#if defined( __linux__ )
+#include <linux/if_ether.h>
+#include <features.h>
+#else
+#include <netinet/if_ether.h>
+#include <sys/sysctl.h>
+#include <net/if_dl.h>
+#endif
+
+const char *progname = "check_dhcp";
+
+/*#define DEBUG*/
+#define HAVE_GETOPT_H
+
+
+/**** Common definitions ****/
+
+#define STATE_OK 0
+#define STATE_WARNING 1
+#define STATE_CRITICAL 2
+#define STATE_UNKNOWN -1
+
+#define OK 0
+#define ERROR -1
+
+#define FALSE 0
+#define TRUE 1
+
+
+/**** DHCP definitions ****/
+
+#define MAX_DHCP_CHADDR_LENGTH 16
+#define MAX_DHCP_SNAME_LENGTH 64
+#define MAX_DHCP_FILE_LENGTH 128
+#define MAX_DHCP_OPTIONS_LENGTH 312
+
+
+typedef struct dhcp_packet_struct{
+ u_int8_t op; /* packet type */
+ u_int8_t htype; /* type of hardware address for this machine (Ethernet, etc) */
+ u_int8_t hlen; /* length of hardware address (of this machine) */
+ u_int8_t hops; /* hops */
+ u_int32_t xid; /* random transaction id number - chosen by this machine */
+ u_int16_t secs; /* seconds used in timing */
+ u_int16_t flags; /* flags */
+ struct in_addr ciaddr; /* IP address of this machine (if we already have one) */
+ struct in_addr yiaddr; /* IP address of this machine (offered by the DHCP server) */
+ struct in_addr siaddr; /* IP address of DHCP server */
+ struct in_addr giaddr; /* IP address of DHCP relay */
+ unsigned char chaddr [MAX_DHCP_CHADDR_LENGTH]; /* hardware address of this machine */
+ char sname [MAX_DHCP_SNAME_LENGTH]; /* name of DHCP server */
+ char file [MAX_DHCP_FILE_LENGTH]; /* boot file name (used for diskless booting?) */
+ char options[MAX_DHCP_OPTIONS_LENGTH]; /* options */
+ }dhcp_packet;
+
+
+typedef struct dhcp_offer_struct{
+ struct in_addr server_address; /* address of DHCP server that sent this offer */
+ struct in_addr offered_address; /* the IP address that was offered to us */
+ u_int32_t lease_time; /* lease time in seconds */
+ u_int32_t renewal_time; /* renewal time in seconds */
+ u_int32_t rebinding_time; /* rebinding time in seconds */
+ struct dhcp_offer_struct *next;
+ }dhcp_offer;
+
+
+typedef struct requested_server_struct{
+ struct in_addr server_address;
+ struct requested_server_struct *next;
+ }requested_server;
+
+
+#define BOOTREQUEST 1
+#define BOOTREPLY 2
+
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNACK 6
+#define DHCPRELEASE 7
+
+#define DHCP_OPTION_MESSAGE_TYPE 53
+#define DHCP_OPTION_HOST_NAME 12
+#define DHCP_OPTION_BROADCAST_ADDRESS 28
+#define DHCP_OPTION_REQUESTED_ADDRESS 50
+#define DHCP_OPTION_LEASE_TIME 51
+#define DHCP_OPTION_RENEWAL_TIME 58
+#define DHCP_OPTION_REBINDING_TIME 59
+
+#define DHCP_INFINITE_TIME 0xFFFFFFFF
+
+#define DHCP_BROADCAST_FLAG 32768
+
+#define DHCP_SERVER_PORT 67
+#define DHCP_CLIENT_PORT 68
+
+#define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
+#define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
+
+unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
+
+char network_interface_name[8]="eth0";
+
+u_int32_t packet_xid=0;
+
+u_int32_t dhcp_lease_time=0;
+u_int32_t dhcp_renewal_time=0;
+u_int32_t dhcp_rebinding_time=0;
+
+int dhcpoffer_timeout=2;
+
+dhcp_offer *dhcp_offer_list=NULL;
+requested_server *requested_server_list=NULL;
+
+int valid_responses=0; /* number of valid DHCPOFFERs we received */
+int requested_servers=0;
+int requested_responses=0;
+
+int request_specific_address=FALSE;
+int received_requested_address=FALSE;
+struct in_addr requested_address;
+
+
+int process_arguments(int, char **);
+int call_getopt(int, char **);
+int validate_arguments(void);
+void print_usage(void);
+void print_help(void);
+
+int get_hardware_address(int,char *);
+
+int send_dhcp_discover(int);
+int get_dhcp_offer(int);
+
+int get_results(void);
+
+int add_dhcp_offer(struct in_addr,dhcp_packet *);
+int free_dhcp_offer_list(void);
+int free_requested_server_list(void);
+
+int create_dhcp_socket(void);
+int close_dhcp_socket(int);
+int send_dhcp_packet(void *,int,int,struct sockaddr_in *);
+int receive_dhcp_packet(void *,int,int,int,struct sockaddr_in *);
+
+
+
+int main(int argc, char **argv){
+ int dhcp_socket;
+ int result;
+
+ if(process_arguments(argc,argv)!=OK){
+ /*usage("Invalid command arguments supplied\n");*/
+ printf("Invalid command arguments supplied\n");
+ exit(STATE_UNKNOWN);
+ }
+
+
+ /* create socket for DHCP communications */
+ dhcp_socket=create_dhcp_socket();
+
+ /* get hardware address of client machine */
+ get_hardware_address(dhcp_socket,network_interface_name);
+
+ /* send DHCPDISCOVER packet */
+ send_dhcp_discover(dhcp_socket);
+
+ /* wait for a DHCPOFFER packet */
+ get_dhcp_offer(dhcp_socket);
+
+ /* close socket we created */
+ close_dhcp_socket(dhcp_socket);
+
+ /* determine state/plugin output to return */
+ result=get_results();
+
+ /* free allocated memory */
+ free_dhcp_offer_list();
+ free_requested_server_list();
+
+ return result;
+ }
+
+
+
+/* determines hardware address on client machine */
+int get_hardware_address(int sock,char *interface_name){
+#if defined(__linux__)
+ struct ifreq ifr;
+
+ strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name));
+
+ /* try and grab hardware address of requested interface */
+ if(ioctl(sock,SIOCGIFHWADDR,&ifr)<0){
+ printf("Error: Could not get hardware address of interface '%s'\n",interface_name);
+ exit(STATE_UNKNOWN);
+ }
+
+ memcpy(&client_hardware_address[0],&ifr.ifr_hwaddr.sa_data,6);
+#else
+ /* Code from getmac.c posted at http://lists.freebsd.org/pipermail/freebsd-hackers/2004-June/007415.html
+ * by Alecs King based on Unix Network programming Ch 17
+ */
+
+ int mib[6], len;
+ char *buf;
+ unsigned char *ptr;
+ struct if_msghdr *ifm;
+ struct sockaddr_dl *sdl;
+
+ mib[0] = CTL_NET;
+ mib[1] = AF_ROUTE;
+ mib[2] = 0;
+ mib[3] = AF_LINK;
+ mib[4] = NET_RT_IFLIST;
+
+ if ((mib[5] = if_nametoindex(interface_name)) == 0) {
+ perror("if_nametoindex error");
+ exit(2);
+ }
+
+ if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
+ perror("sysctl 1 error");
+ exit(3);
+ }
+
+ if ((buf = malloc(len)) == NULL) {
+ perror("malloc error");
+ exit(4);
+ }
+
+ if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
+ perror("sysctl 2 error");
+ exit(5);
+ }
+
+ ifm = (struct if_msghdr *)buf;
+ sdl = (struct sockaddr_dl *)(ifm + 1);
+ ptr = (unsigned char *)LLADDR(sdl);
+ memcpy(&client_hardware_address[0], ptr, 6) ;
+#endif
+
+
+#ifdef DEBUG
+ printf("Hardware address: %02x:%02x:%02x:",client_hardware_address[0],client_hardware_address[1],client_hardware_address[2]);
+ printf("%02x:",client_hardware_address[3]);
+ printf("%02x:%02x\n",client_hardware_address[4],client_hardware_address[5]);
+ printf("\n");
+#endif
+
+ return OK;
+ }
+
+
+/* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
+int send_dhcp_discover(int sock){
+ dhcp_packet discover_packet;
+ struct sockaddr_in sockaddr_broadcast;
+
+
+ /* clear the packet data structure */
+ bzero(&discover_packet,sizeof(discover_packet));
+
+
+ /* boot request flag (backward compatible with BOOTP servers) */
+ discover_packet.op=BOOTREQUEST;
+
+ /* hardware address type */
+ discover_packet.htype=ETHERNET_HARDWARE_ADDRESS;
+
+ /* length of our hardware address */
+ discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
+
+ discover_packet.hops=0;
+
+ /* transaction id is supposed to be random */
+ srand(time(NULL));
+ packet_xid=random();
+ discover_packet.xid=htonl(packet_xid);
+
+ /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
+ /* downright bizzarre... */
+ ntohl(discover_packet.xid);
+
+ /*discover_packet.secs=htons(65535);*/
+ discover_packet.secs=0xFF;
+
+ /* tell server it should broadcast its response */
+ discover_packet.flags=htons(DHCP_BROADCAST_FLAG);
+
+ /* our hardware address */
+ memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH);
+
+ /* first four bytes of options field is magic cookie (as per RFC 2132) */
+ discover_packet.options[0]='\x63';
+ discover_packet.options[1]='\x82';
+ discover_packet.options[2]='\x53';
+ discover_packet.options[3]='\x63';
+
+ /* DHCP message type is embedded in options field */
+ discover_packet.options[4]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
+ discover_packet.options[5]='\x01'; /* DHCP message option length in bytes */
+ discover_packet.options[6]=DHCPDISCOVER;
+
+ /* the IP address we're requesting */
+ if(request_specific_address==TRUE){
+ discover_packet.options[7]=DHCP_OPTION_REQUESTED_ADDRESS;
+ discover_packet.options[8]='\x04';
+ memcpy(&discover_packet.options[9],&requested_address,sizeof(requested_address));
+ }
+
+ /* send the DHCPDISCOVER packet to broadcast address */
+ sockaddr_broadcast.sin_family=AF_INET;
+ sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT);
+ sockaddr_broadcast.sin_addr.s_addr=INADDR_BROADCAST;
+ bzero(&sockaddr_broadcast.sin_zero,sizeof(sockaddr_broadcast.sin_zero));
+
+
+#ifdef DEBUG
+ printf("DHCPDISCOVER to %s port %d\n",inet_ntoa(sockaddr_broadcast.sin_addr),ntohs(sockaddr_broadcast.sin_port));
+ printf("DHCPDISCOVER XID: %lu (0x%X)\n",ntohl(discover_packet.xid),ntohl(discover_packet.xid));
+ printf("DHCDISCOVER ciaddr: %s\n",inet_ntoa(discover_packet.ciaddr));
+ printf("DHCDISCOVER yiaddr: %s\n",inet_ntoa(discover_packet.yiaddr));
+ printf("DHCDISCOVER siaddr: %s\n",inet_ntoa(discover_packet.siaddr));
+ printf("DHCDISCOVER giaddr: %s\n",inet_ntoa(discover_packet.giaddr));
+#endif
+
+ /* send the DHCPDISCOVER packet out */
+ send_dhcp_packet(&discover_packet,sizeof(discover_packet),sock,&sockaddr_broadcast);
+
+#ifdef DEBUG
+ printf("\n\n");
+#endif
+
+ return OK;
+ }
+
+
+
+
+/* waits for a DHCPOFFER message from one or more DHCP servers */
+int get_dhcp_offer(int sock){
+ dhcp_packet offer_packet;
+ struct sockaddr_in source;
+ int result=OK;
+ int timeout=1;
+ int responses=0;
+ int x;
+ time_t start_time;
+ time_t current_time;
+
+ time(&start_time);
+
+ /* receive as many responses as we can */
+ for(responses=0,valid_responses=0;;){
+
+ time(¤t_time);
+ if((current_time-start_time)>=dhcpoffer_timeout)
+ break;
+
+#ifdef DEBUG
+ printf("\n\n");
+#endif
+
+ bzero(&source,sizeof(source));
+ bzero(&offer_packet,sizeof(offer_packet));
+
+ result=OK;
+ result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);
+
+ if(result!=OK){
+#ifdef DEBUG
+ printf("Result=ERROR\n");
+#endif
+ continue;
+ }
+ else{
+#ifdef DEBUG
+ printf("Result=OK\n");
+#endif
+ responses++;
+ }
+
+#ifdef DEBUG
+ printf("DHCPOFFER from IP address %s\n",inet_ntoa(source.sin_addr));
+ printf("DHCPOFFER XID: %lu (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
+#endif
+
+ /* check packet xid to see if its the same as the one we used in the discover packet */
+ if(ntohl(offer_packet.xid)!=packet_xid){
+#ifdef DEBUG
+ printf("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n",ntohl(offer_packet.xid),packet_xid);
+#endif
+ continue;
+ }
+
+ /* check hardware address */
+ result=OK;
+#ifdef DEBUG
+ printf("DHCPOFFER chaddr: ");
+#endif
+ for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
+#ifdef DEBUG
+ printf("%02X",(unsigned char)offer_packet.chaddr[x]);
+#endif
+ if(offer_packet.chaddr[x]!=client_hardware_address[x]){
+ result=ERROR;
+ }
+ }
+#ifdef DEBUG
+ printf("\n");
+#endif
+ if(result==ERROR){
+#ifdef DEBUG
+ printf("DHCPOFFER hardware address did not match our own - ignoring packet\n");
+#endif
+ continue;
+ }
+
+#ifdef DEBUG
+ printf("DHCPOFFER ciaddr: %s\n",inet_ntoa(offer_packet.ciaddr));
+ printf("DHCPOFFER yiaddr: %s\n",inet_ntoa(offer_packet.yiaddr));
+ printf("DHCPOFFER siaddr: %s\n",inet_ntoa(offer_packet.siaddr));
+ printf("DHCPOFFER giaddr: %s\n",inet_ntoa(offer_packet.giaddr));
+#endif
+
+ add_dhcp_offer(source.sin_addr,&offer_packet);
+
+ valid_responses++;
+ }
+
+#ifdef DEBUG
+ printf("Total responses seen on the wire: %d\n",responses);
+ printf("Valid responses for this machine: %d\n",valid_responses);
+#endif
+
+ return OK;
+ }
+
+
+
+/* sends a DHCP packet */
+int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest){
+ struct sockaddr_in myname;
+ int result;
+
+ result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest));
+
+#ifdef DEBUG
+ printf("send_dhcp_packet result: %d\n",result);
+#endif
+
+ if(result<0)
+ return ERROR;
+
+ return OK;
+ }
+
+
+
+/* receives a DHCP packet */
+int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address){
+ struct timeval tv;
+ fd_set readfds;
+ int recv_result;
+ socklen_t address_size;
+ struct sockaddr_in source_address;
+
+
+ /* wait for data to arrive (up time timeout) */
+ tv.tv_sec=timeout;
+ tv.tv_usec=0;
+ FD_ZERO(&readfds);
+ FD_SET(sock,&readfds);
+ select(sock+1,&readfds,NULL,NULL,&tv);
+
+ /* make sure some data has arrived */
+ if(!FD_ISSET(sock,&readfds)){
+#ifdef DEBUG
+ printf("No (more) data received\n");
+#endif
+ return ERROR;
+ }
+
+ else{
+
+ /* 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
+ not being interpreted correctly. sigh... */
+ bzero(&source_address,sizeof(source_address));
+ address_size=sizeof(source_address);
+ recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr *)&source_address,&address_size);
+#ifdef DEBUG
+ printf("recv_result_1: %d\n",recv_result);
+#endif
+ recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size);
+#ifdef DEBUG
+ printf("recv_result_2: %d\n",recv_result);
+#endif
+
+ if(recv_result==-1){
+#ifdef DEBUG
+ printf("recvfrom() failed, ");
+ printf("errno: (%d) -> %s\n",errno,strerror(errno));
+#endif
+ return ERROR;
+ }
+ else{
+#ifdef DEBUG
+ printf("receive_dhcp_packet() result: %d\n",recv_result);
+ printf("receive_dhcp_packet() source: %s\n",inet_ntoa(source_address.sin_addr));
+#endif
+
+ memcpy(address,&source_address,sizeof(source_address));
+ return OK;
+ }
+ }
+
+ return OK;
+ }
+
+
+
+/* creates a socket for DHCP communication */
+int create_dhcp_socket(void){
+ struct sockaddr_in myname;
+ struct ifreq interface;
+ int sock;
+ int flag=1;
+
+ /* Set up the address we're going to bind to. */
+ bzero(&myname,sizeof(myname));
+ myname.sin_family=AF_INET;
+ myname.sin_port=htons(DHCP_CLIENT_PORT);
+ myname.sin_addr.s_addr=INADDR_ANY; /* listen on any address */
+ bzero(&myname.sin_zero,sizeof(myname.sin_zero));
+
+ /* create a socket for DHCP communications */
+ sock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
+ if(sock<0){
+ printf("Error: Could not create socket!\n");
+ exit(STATE_UNKNOWN);
+ }
+
+#ifdef DEBUG
+ printf("DHCP socket: %d\n",sock);
+#endif
+
+ /* set the reuse address flag so we don't get errors when restarting */
+ flag=1;
+ if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(char *)&flag,sizeof(flag))<0){
+ printf("Error: Could not set reuse address option on DHCP socket!\n");
+ exit(STATE_UNKNOWN);
+ }
+
+ /* set the broadcast option - we need this to listen to DHCP broadcast messages */
+ if(setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){
+ printf("Error: Could not set broadcast option on DHCP socket!\n");
+ exit(STATE_UNKNOWN);
+ }
+
+ /* bind socket to interface */
+#if defined(__linux__)
+ strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
+ if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
+ printf("Error: Could not bind socket to interface %s. Check your privileges...\n",network_interface_name);
+ exit(STATE_UNKNOWN);
+ }
+
+#else
+ strncpy(interface.ifr_name,network_interface_name,IFNAMSIZ);
+#endif
+
+ /* bind the socket */
+ if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
+ printf("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n",DHCP_CLIENT_PORT);
+ exit(STATE_UNKNOWN);
+ }
+
+ return sock;
+ }
+
+
+
+
+
+/* closes DHCP socket */
+int close_dhcp_socket(int sock){
+
+ close(sock);
+
+ return OK;
+ }
+
+
+
+
+/* adds a requested server address to list in memory */
+int add_requested_server(struct in_addr server_address){
+ requested_server *new_server;
+
+ new_server=(requested_server *)malloc(sizeof(requested_server));
+ if(new_server==NULL)
+ return ERROR;
+
+ new_server->server_address=server_address;
+
+ new_server->next=requested_server_list;
+ requested_server_list=new_server;
+
+ requested_servers++;
+
+#ifdef DEBUG
+ printf("Requested server address: %s\n",inet_ntoa(new_server->server_address));
+#endif
+
+ return OK;
+ }
+
+
+
+
+/* adds a DHCP OFFER to list in memory */
+int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){
+ dhcp_offer *new_offer;
+ int x;
+ int y;
+ unsigned option_type;
+ unsigned option_length;
+
+ if(offer_packet==NULL)
+ return ERROR;
+
+ /* process all DHCP options present in the packet */
+ for(x=4;x<MAX_DHCP_OPTIONS_LENGTH;){
+
+ /* end of options (0 is really just a pad, but bail out anyway) */
+ if((int)offer_packet->options[x]==-1 || (int)offer_packet->options[x]==0)
+ break;
+
+ /* get option type */
+ option_type=offer_packet->options[x++];
+
+ /* get option length */
+ option_length=offer_packet->options[x++];
+
+#ifdef DEBUG
+ printf("Option: %d (0x%02X)\n",option_type,option_length);
+#endif
+
+ /* get option data */
+ if(option_type==DHCP_OPTION_LEASE_TIME)
+ dhcp_lease_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
+ if(option_type==DHCP_OPTION_RENEWAL_TIME)
+ dhcp_renewal_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
+ if(option_type==DHCP_OPTION_REBINDING_TIME)
+ dhcp_rebinding_time=ntohl(*((u_int32_t *)&offer_packet->options[x]));
+
+ /* skip option data we're ignoring */
+ else
+ for(y=0;y<option_length;y++,x++);
+ }
+
+#ifdef DEBUG
+ if(dhcp_lease_time==DHCP_INFINITE_TIME)
+ printf("Lease Time: Infinite\n");
+ else
+ printf("Lease Time: %lu seconds\n",(unsigned long)dhcp_lease_time);
+ if(dhcp_renewal_time==DHCP_INFINITE_TIME)
+ printf("Renewal Time: Infinite\n");
+ else
+ printf("Renewal Time: %lu seconds\n",(unsigned long)dhcp_renewal_time);
+ if(dhcp_rebinding_time==DHCP_INFINITE_TIME)
+ printf("Rebinding Time: Infinite\n");
+ printf("Rebinding Time: %lu seconds\n",(unsigned long)dhcp_rebinding_time);
+#endif
+
+ new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer));
+
+ if(new_offer==NULL)
+ return ERROR;
+
+
+ new_offer->server_address=source;
+ new_offer->offered_address=offer_packet->yiaddr;
+ new_offer->lease_time=dhcp_lease_time;
+ new_offer->renewal_time=dhcp_renewal_time;
+ new_offer->rebinding_time=dhcp_rebinding_time;
+
+
+#ifdef DEBUG
+ printf("Added offer from server @ %s",inet_ntoa(new_offer->server_address));
+ printf(" of IP address %s\n",inet_ntoa(new_offer->offered_address));
+#endif
+
+ /* add new offer to head of list */
+ new_offer->next=dhcp_offer_list;
+ dhcp_offer_list=new_offer;
+
+ return OK;
+ }
+
+
+
+
+/* frees memory allocated to DHCP OFFER list */
+int free_dhcp_offer_list(void){
+ dhcp_offer *this_offer;
+ dhcp_offer *next_offer;
+
+ for(this_offer=dhcp_offer_list;this_offer!=NULL;this_offer=next_offer){
+ next_offer=this_offer->next;
+ free(this_offer);
+ }
+
+ return OK;
+ }
+
+
+
+
+/* frees memory allocated to requested server list */
+int free_requested_server_list(void){
+ requested_server *this_server;
+ requested_server *next_server;
+
+ for(this_server=requested_server_list;this_server!=NULL;this_server=next_server){
+ next_server=this_server->next;
+ free(this_server);
+ }
+
+ return OK;
+ }
+
+
+/* gets state and plugin output to return */
+int get_results(void){
+ dhcp_offer *temp_offer;
+ requested_server *temp_server;
+ int result;
+ u_int32_t max_lease_time=0;
+
+ received_requested_address=FALSE;
+
+ /* checks responses from requested servers */
+ requested_responses=0;
+ if(requested_servers>0){
+
+ for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){
+
+ for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
+
+ /* get max lease time we were offered */
+ if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
+ max_lease_time=temp_offer->lease_time;
+
+ /* see if we got the address we requested */
+ if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
+ received_requested_address=TRUE;
+
+ /* see if the servers we wanted a response from talked to us or not */
+ if(!memcmp(&temp_offer->server_address,&temp_server->server_address,sizeof(temp_server->server_address))){
+#ifdef DEBUG
+ printf("DHCP Server Match: Offerer=%s",inet_ntoa(temp_offer->server_address));
+ printf(" Requested=%s\n",inet_ntoa(temp_server->server_address));
+#endif
+ requested_responses++;
+ }
+ }
+ }
+
+ }
+
+ /* else check and see if we got our requested address from any server */
+ else{
+
+ for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next){
+
+ /* get max lease time we were offered */
+ if(temp_offer->lease_time>max_lease_time || temp_offer->lease_time==DHCP_INFINITE_TIME)
+ max_lease_time=temp_offer->lease_time;
+
+ /* see if we got the address we requested */
+ if(!memcmp(&requested_address,&temp_offer->offered_address,sizeof(requested_address)))
+ received_requested_address=TRUE;
+ }
+ }
+
+ result=STATE_OK;
+ if(valid_responses==0)
+ result=STATE_CRITICAL;
+ else if(requested_servers>0 && requested_responses==0)
+ result=STATE_CRITICAL;
+ else if(requested_responses<requested_servers)
+ result=STATE_WARNING;
+ else if(request_specific_address==TRUE && received_requested_address==FALSE)
+ result=STATE_WARNING;
+
+
+ printf("DHCP %s: ",(result==STATE_OK)?"ok":"problem");
+
+ /* we didn't receive any DHCPOFFERs */
+ if(dhcp_offer_list==NULL){
+ printf("No DHCPOFFERs were received.\n");
+ return result;
+ }
+
+ printf("Received %d DHCPOFFER(s)",valid_responses);
+
+ if(requested_servers>0)
+ printf(", %s%d of %d requested servers responded",((requested_responses<requested_servers) && requested_responses>0)?"only ":"",requested_responses,requested_servers);
+
+ if(request_specific_address==TRUE)
+ printf(", requested address (%s) was %soffered",inet_ntoa(requested_address),(received_requested_address==TRUE)?"":"not ");
+
+ printf(", max lease time = ");
+ if(max_lease_time==DHCP_INFINITE_TIME)
+ printf("Infinity");
+ else
+ printf("%lu sec",(unsigned long)max_lease_time);
+
+ printf(".\n");
+
+ return result;
+ }
+
+
+
+
+
+
+/* print usage help */
+void print_help(void){
+
+ /*print_revision(progname,"$Revision$");*/
+
+ printf("Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n\n");
+ printf("This plugin tests the availability of DHCP servers on a network.\n\n");
+
+ print_usage();
+
+ printf
+ ("\nOptions:\n"
+ " -s, --serverip=IPADDRESS\n"
+ " IP address of DHCP server that we must hear from\n"
+ " -r, --requestedip=IPADDRESS\n"
+ " IP address that should be offered by at least one DHCP server\n"
+ " -t, --timeout=INTEGER\n"
+ " Seconds to wait for DHCPOFFER before timeout occurs\n"
+ " -i, --interface=STRING\n"
+ " Interface to to use for listening (i.e. eth0)\n"
+ " -v, --verbose\n"
+ " Print extra information (command-line use only)\n"
+ " -h, --help\n"
+ " Print detailed help screen\n"
+ " -V, --version\n"
+ " Print version information\n\n"
+ );
+
+ /*support();*/
+
+ return;
+ }
+
+
+/* prints usage information */
+void print_usage(void){
+
+ printf("Usage: %s [-s serverip] [-r requestedip] [-t timeout] [-i interface]\n",progname);
+ printf(" %s --help\n",progname);
+ printf(" %s --version\n",progname);
+
+ return;
+ }
+
+
+
+
+/* process command-line arguments */
+int process_arguments(int argc, char **argv){
+ int c;
+
+ if(argc<1)
+ return ERROR;
+
+ c=0;
+ while((c+=(call_getopt(argc-c,&argv[c])))<argc){
+
+ /*
+ if(is_option(argv[c]))
+ continue;
+ */
+ }
+
+ return validate_arguments();
+ }
+
+
+
+int call_getopt(int argc, char **argv){
+ int c=0;
+ int i=0;
+ struct in_addr ipaddress;
+
+#ifdef HAVE_GETOPT_H
+ int option_index = 0;
+ static struct option long_options[] =
+ {
+ {"serverip", required_argument,0,'s'},
+ {"requestedip", required_argument,0,'r'},
+ {"timeout", required_argument,0,'t'},
+ {"interface", required_argument,0,'i'},
+ {"verbose", no_argument, 0,'v'},
+ {"version", no_argument, 0,'V'},
+ {"help", no_argument, 0,'h'},
+ {0,0,0,0}
+ };
+#endif
+
+ while(1){
+#ifdef HAVE_GETOPT_H
+ c=getopt_long(argc,argv,"+hVvt:s:r:t:i:",long_options,&option_index);
+#else
+ c=getopt(argc,argv,"+?hVvt:s:r:t:i:");
+#endif
+
+ i++;
+
+ if(c==-1||c==EOF||c==1)
+ break;
+
+ switch(c){
+ case 'w':
+ case 'r':
+ case 't':
+ case 'i':
+ i++;
+ break;
+ default:
+ break;
+ }
+
+ switch(c){
+
+ case 's': /* DHCP server address */
+ if(inet_aton(optarg,&ipaddress))
+ add_requested_server(ipaddress);
+ /*
+ else
+ usage("Invalid server IP address\n");
+ */
+ break;
+
+ case 'r': /* address we are requested from DHCP servers */
+ if(inet_aton(optarg,&ipaddress)){
+ requested_address=ipaddress;
+ request_specific_address=TRUE;
+ }
+ /*
+ else
+ usage("Invalid requested IP address\n");
+ */
+ break;
+
+ case 't': /* timeout */
+
+ /*
+ if(is_intnonneg(optarg))
+ */
+ if(atoi(optarg)>0)
+ dhcpoffer_timeout=atoi(optarg);
+ /*
+ else
+ usage("Time interval must be a nonnegative integer\n");
+ */
+ break;
+
+ case 'i': /* interface name */
+
+ strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
+ network_interface_name[sizeof(network_interface_name)-1]='\x0';
+
+ break;
+
+ case 'V': /* version */
+
+ /*print_revision(progname,"$Revision$");*/
+ exit(STATE_OK);
+
+ case 'h': /* help */
+
+ print_help();
+ exit(STATE_OK);
+
+ case '?': /* help */
+
+ /*usage("Invalid argument\n");*/
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ return i;
+ }
+
+
+
+int validate_arguments(void){
+
+ return OK;
+ }
+