C++ (Cpp) receive_dhcp_packet Exemples

Exemple #1

Fichier : check_dhcp.c Projet : FatLASP/nagios-plugins

/* 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;
	struct sockaddr_in via;
	int result=OK;
	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(&current_time);
		if((current_time-start_time)>=dhcpoffer_timeout)
			break;

		if(verbose)
			printf("\n\n");

		bzero(&source,sizeof(source));
		bzero(&via,sizeof(via));
		bzero(&offer_packet,sizeof(offer_packet));

		result=OK;
		result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source);

		if(result!=OK){
			if(verbose)
				printf(_("Result=ERROR\n"));

			continue;
		        }
		else{
			if(verbose)
				printf(_("Result=OK\n"));

			responses++;
		        }

		/* The "source" is either a server or a relay. */
		/* Save a copy of "source" into "via" even if it's via itself */
		memcpy(&via,&source,sizeof(source)) ;

		if(verbose){
			printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr));
			printf(_(" via %s\n"),inet_ntoa(via.sin_addr));
			printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid));
			}

		/* 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){
			if(verbose)
				printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid);

			continue;
		        }

		/* check hardware address */
		result=OK;
		if(verbose)
			printf("DHCPOFFER chaddr: ");

		for(x=0;x<ETHERNET_HARDWARE_ADDRESS_LENGTH;x++){
			if(verbose)
				printf("%02X",(unsigned char)offer_packet.chaddr[x]);

			if(offer_packet.chaddr[x]!=client_hardware_address[x])
				result=ERROR;
			}
		if(verbose)
			printf("\n");

		if(result==ERROR){
			if(verbose)
				printf(_("DHCPOFFER hardware address did not match our own - ignoring packet\n"));

			continue;
		        }

		if(verbose){
			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));
			}

		add_dhcp_offer(source.sin_addr,&offer_packet);

		valid_responses++;
	        }

	if(verbose){
		printf(_("Total responses seen on the wire: %d\n"),responses);
		printf(_("Valid responses for this machine: %d\n"),valid_responses);
		}

	return OK;
        }

Exemple #2

Fichier : test_dhcp.c Projet : nomius/kwtools

/* 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(&current_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;
        }