diff options
Diffstat (limited to 'contrib/check_dhcp.c')
| -rw-r--r-- | contrib/check_dhcp.c | 1001 |
1 files changed, 0 insertions, 1001 deletions
diff --git a/contrib/check_dhcp.c b/contrib/check_dhcp.c deleted file mode 100644 index 8669e44a..00000000 --- a/contrib/check_dhcp.c +++ /dev/null @@ -1,1001 +0,0 @@ -/****************************************************************************** -* -* 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 <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 <features.h> -#include <linux/if_ether.h> -#include <getopt.h> -#include <net/if.h> -#include <sys/socket.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <arpa/inet.h> -#include <netdb.h> - -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){ - 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); - -#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 */ - 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); - } - - /* 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; - } - |