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Diffstat (limited to 'contrib/check_dhcp.c')
| -rw-r--r-- | contrib/check_dhcp.c | 992 |
1 files changed, 992 insertions, 0 deletions
diff --git a/contrib/check_dhcp.c b/contrib/check_dhcp.c new file mode 100644 index 00000000..8168b947 --- /dev/null +++ b/contrib/check_dhcp.c @@ -0,0 +1,992 @@ +/****************************************************************************** +* +* CHECK_DHCP.C +* +* Program: DHCP plugin for Nagios +* License: GPL +* Copyright (c) 2001 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> + +#define 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_in *)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 recieved\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)); + recv_result=recvfrom(sock,(char *)buffer,buffer_size,MSG_PEEK,(struct sockaddr_in *)&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_in *)&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; + 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 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 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; + } + |